Instruction Manual PN SO/rev.A April Model 1181SO. Dissolved Oxygen Two-Wire Transmitter

Transcription

1 Instruction Manual PN SO/rev.A April 2003 Model 1181SO Dissolved Oxygen Two-Wire Transmitter

2 ESSENTIAL INSTRUCTIONS READ THIS PAGE BEFORE PRO- CEEDING! Rosemount Analytical designs, manufactures, and tests its products to meet many national and international standards. Because these instruments are sophisticated technical products, you must properly install, use, and maintain them to ensure they continue to operate within their normal specifications. The following instructions must be adhered to and integrated into your safety program when installing, using, and maintaining Rosemount Analytical products. Failure to follow the proper instructions may cause any one of the following situations to occur: Loss of life; personal injury; property damage; damage to this instrument; and warranty invalidation. Read all instructions prior to installing, operating, and servicing the product. If this Instruction Manual is not the correct manual, telephone and the requested manual will be provided. Save this Instruction Manual for future reference. If you do not understand any of the instructions, contact your Rosemount representative for clarification. Follow all warnings, cautions, and instructions marked on and supplied with the product. Inform and educate your personnel in the proper installation, operation, and maintenance of the product. Install your equipment as specified in the Installation Instructions of the appropriate Instruction Manual and per applicable local and national codes. Connect all products to the proper electrical and pressure sources. To ensure proper performance, use qualified personnel to install, operate, update, program, and maintain the product. When replacement parts are required, ensure that qualified people use replacement parts specified by Rosemount. Unauthorized parts and procedures can affect the product s performance and place the safe operation of your process at risk. Look alike substitutions may result in fire, electrical hazards, or improper operation. Ensure that all equipment doors are closed and protective covers are in place, except when maintenance is being performed by qualified persons, to prevent electrical shock and personal injury. DANGER HAZARDOUS AREA INSTALLATION INTRINSICALLY SAFE INSTALLATION Installations in hazardous area locations must be carefully evaluated by qualified on site safety personnel. Transmitter and Sensor alone are not Intrinsically safe. To secure and maintain an intrinsically safe installation, a certified safety barrier must be used and the installation must comply with the governing approval agency (FM, CSA or BASEEFA/CENELEC) installation drawing requirements (see Section Installation). EXPLOSION-PROOF INSTALLATION Caution: Sensors are not explosion-proof. If the sensor must be installed in a hazardous location an intrinsically safe system must be implemented. To maintain the explosion-proof rating of the transmitter, the following conditions must be met: Discontinue power supply before removing enclosure covers. Transmitter covers must be properly installed during power on operation. Explosion proof "Y" fittings must be properly installed with sealing compound prior to applying power to the transmitter. Serial tag cover over the external Zero and Span adjustments must be in place. See Installation Section for details. Proper installation, operation and servicing of this instrument in a Hazardous Area Installation is entirely the responsibility of the user. Emerson Process Management Rosemount Analytical Inc Barranca Parkway Irvine, CA USA Tel: (949) Fax: (949) Rosemount Analytical Inc. 2001

3 MODEL 1181SO TABLE OF CONTENTS MODEL 1181SO DISSOLVED OXYGEN TWO-WIRE TRANSMITTER TABLE OF CONTENTS Section Title Page 1.0 DESCRIPTION AND SPECIFICATIONS Features and Applications Performance Specifications Ordering Information INSTALLATION Unpacking and Inspection Mechanical Installation Sensor Installation Electrical Installation Hazardous Locations-Explosion Proof Installation Hazardous Locations-Intrinsically Safe Installation CONFIGURATION, START-UP AND CALIBRATION General Configuration Start up Span Calibration OPERATION AND DESCRIPTION OF CONTROLS Theory of Operation Measurement Variables Description of Controls Converting to an LCD unit DIAGNOSTICS AND MAINTENANCE General Disassembly Procedure Reassembly Procedure Troubleshooting SO Operation Check SPARE PARTS Spare Parts RETURN OF MATERIALS General Warranty Repair Non Warranty Repair i

4 MODEL 1181SO TABLE OF CONTENTS TABLE OF CONTENTS CONT D. LIST OF FIGURES Figure No. Title Page 2-1 Mounting and Dimensional Drawing Model 1181 SO Wiring Details FM Explosion Proof Installation FM Intrinsically Safe Installation and Entity Parameters CSA Intrinsically Safe Installation CENELEC Intrinsically Safe Installation Calibration Set Up Calibration with Agitated Fresh Water Oxygen Solubility in Fresh and Sea Water Location of Controls SO LCD Meter Option SO Operation Check Up SO Parts Breakdown SO Transmitter PCB SO Transducer PCB SO Power Supply PCB SO PCB Stack LIST OF TABLES 2-1 Wiring Model 1181 SO to Model Hx438 and Gx448 sensors Range -vs- Dip Switch Position Water Vapor Partial Pressure Solubility of Oxygen LCD Decimal Point Set Up Troubleshooting Guide ii

5 MODEL 1181 SO SECTION 1.0 GENERAL DESCRIPTION AND SPECIFICATIONS SECTION 1.0 DESCRIPTION AND SPECIFICATIONS TWO-WIRE FIELD MOUNTED TRANSMITTERS. Ideal for multiple loop installations where central data processing and control are required. Field mounting near the sensor for ease in routine calibration. NEMA 4X WEATHERPROOF, CORROSION-RESISTANT, DUAL COMPARTMENT HOUSING provides maximum circuit protection for increased reliability in industrial environments. HAZARDOUS AREA INSTALLATION. Certified NEMA 7B explosion-proof and intrinsically safe when used with an approved sensor and safety barrier. COMMONALITY OF PARTS reduces inventory required to support different field measurements. SWITCH SELECTABLE RANGES further reduces inventory by permitting calibration of one Model to virtually any Tag Number requiring the same measurement. EXTERNAL ZERO AND SPAN, 20-turn potentiometers provide for fine calibration of the isolated 4-20 ma output signal. 1.1 FEATURES AND APPLICATIONS The Rosemount Analytical Two-Wire field mounted transmitters, with the appropriate sensors, are designed to continuously measure the ph, ORP, Conductivity, Dissolved Oxygen, or Free Residual Chlorine in industrial processes. The Model 1181 Transmitters include all the circuitry necessary for the measurement and transmission of an isolated 4-20 ma linear signal. Measurement range selection is made through internal range switches that are easily accessed by removing a housing cover. No further disassembly is required. A matrix is provided which conveniently indicates the proper switch position. Range selection can be made without the use of the instruction manual. Fine calibration of the 4-20 ma signal is accomplished with the 20-turn external Zero and Span potentiometers. The electronic printed circuits are protected from the environment by the NEMA 4X weatherproof, corrosion resistant enclosure. The printed circuit cards plug into a moisture barrier which is isolated from the field wiring and calibration terminals. Routine field calibration does not require exposing the electronics to harsh industrial environments. All PCBs are conformal coated for maximum protection. The PCBs are removed as a unit and may be individually replaced. The transmitter housing covers are sealed with large cross sectional O-rings and need not be replaced each time the cover is removed. The Model 1181 is available with or without an analog or digital display. The digital display may be calibrated in engineering units and the analog display features multiple scales in engineering units. The transmitters are certified explosion-proof, NEMA 7B, and intrinsically safe when installed with an approved barrier and sensor. Hazardous area certificates are provided by BASEEFA to CENELEC regulations, FM and CSA. Accessory items are available for the two-wire transmitters. The Model 515 Isolated Power Supply provides power for up to 20 transmitters. Two transmitters may be wired directly to the power supply. For more than two transmitters, junction boxes are available, each accommodating wiring for a maximum of ten transmitters. Remote alarms are available with independently adjustable set points and hysteresis. Contacts of the Model 230A may be specified for high/low, high/high, or low/low operation. The impedance of the Model 230A Alarm Module is less than 100 ohms. For further information on the Models 515 and 230A, please refer to to their respective product data sheet. The Model 1181SO Transmitter is designed for use with the Models Hx438 and Gx448 Steam Sterilizable Dissolved Oxygen Sensors used for sanitary applications in food, beverage, and pharmaceutical industries. Switch selectable measurement ranges are 0-100, and mm Hg. The 1181SO includes a standby position on the range switch which maintains the polarizing voltage on the sensor to enable faster response after removal and replacement into the vessel. 1

6 MODEL 1181 SO SECTION 1.0 DESCRIPTION AN SPECIFICATIONS 1.2 SPECIFICATIONS PHYSICAL SPECIFICATIONS GENERAL Enclosure: NEMA 4X, weatherproof and corrosionresistant NEMA 7B, explosion proof Hazardous Area Classification: Explosion Proof (1181 PB & SO): FM: Class I, Groups B, C, & D, Div. 1 Class II, Groups E, F, & G, Div. 1 Class III CSA: Class I, Groups C & D Class II, Groups E, F, & G Class III, Encl 4 Class I, Groups A, B, C, & D, Div. 2 Encl 4, Factory Sealed Intrinsic Safety (1181 PB & SO): FM: Class I, II, III, Div. 1 CSA: Class I, Groups A, B, C & D, Encl 4 Temperature Code T4 CENELEC: Ex ia IIB T4 (Tamb = 55 C) Display: Analog: plug in, 90 degree, 2.5 inch diameter 1181PB: triple scale, 0-5, 0-10, 0-20 ppb X SO: triple scale, 0-100, 0-200, mm Hg Digital: 3.5 digit, LCD, adjustable range in engineering units Recommended Cable: Transmitter to Power Supply Two Wire, 18 AWG, shielded, Belden 8760 or equal (Rosemount Analytical P/N ) Weight/Shipping Weight: Blind: 1.44 kg/1.89 kg (3.18 lbs/4.18 lbs) Analog/Digital: 2.15 kg/2.6 kg (4.74 lb/5.75 lb) PERFORMANCE SPECIFICATIONS GENERAL Power Supply Requirements: (See Load/Supply Chart) Lift Off Voltage: Blind & Analog: 10 VDC Digital: 12.5 VDC Maximum Operating Power: 40 milliwatts Output: Blind & Analog: Isolated 4-20 ma into 700 ohms at 24 VDC Digital: Isolated 4-20 ma into 575 ohms at 24 VDC Input/Output Isolation: 600 Volts Ambient Temperature: 30 to 70 C Relative Humidity: 0-90% Digital Display Accuracy: 0.1% reading ±1.0 count Analog Display Accuracy: ±2.0% External Zero: ±7.0% full scale External Span: ±7.0% full scale Shock: 10G maximum for 10 milliseconds Vibration: inches double amplitude 5 to 50 Hz for 2 hours EMI/RFI: EN PERFORMANCE 25 C Measurement Range: 0-100, 0-200, & mm Hg with Standby Accuracy: ±1.0% full scale Stability: ±0.1% full scale/month, non-cumulative Repeatability: ±1.0 full scale Temperature Coefficient: ±0.3 %/ C Automatic Temperature Compensation: 15 to 50 C RECOMMENDED SENSORS: Model Hx438 Model Gx448 Steam Sterilizable Dissolved Oxygen Sensor Steam Sterilizable Dissolved Oxygen Sensor 2

7 MODEL 1181 SO SECTION 1.0 DESCRIPTION AN SPECIFICATIONS DIGITAL DISPLAY LOAD/POWER SUPPLY REQUIREMENTS OHMS MIN OHMS MAX. OPERATING REGION VDC VDC LOAD RESISTANCE REQUIRED 12.5 VDC 24 VDC 35.5 ZERO LOAD 45 VDC LIFT OFF NOMINAL MAXIMUM POWER SUPPLY VOLTAGE BLIND & ANALOG DISPLAY LOAD/POWER SUPPLY REQUIREMENTS OHMS MIN OHMS MAX. OPERATING REGION VDC VDC LOAD RESISTANCE REQUIRED 10 VDC 24 VDC 33 ZERO LOAD 45 VDC LIFT OFF NOMINAL MAXIMUM POWER SUPPLY VOLTAGE 1.3 ORDERING INFORMATION Model 1181 Two Wire Transmitter is housed in a NEMA 7B explosion-proof, 4X weatherproof, corrosion-resistant enclosure and includes all the circuitry necessary for measurement and transmission of an isolated 4-20 ma signal. The transmitter may be selected with local analog or digital display or as a blind unit. MODEL 1181SO TWO-WIRE TRANSMITTER Code Display (Required Selection) 02 Blind, no indication 03 Analog display 06 Digital display Code Agency Approvals 67 FM Explosion proof and Intrinsically Safe 69 CSA Explosion proof and Intrinsically Safe 73 CENELEC Intrinsically Safe/CE 1181 SO EXAMPLE NOTE: Recommended cable from +24 volt DC power supply to Model 1181SO is Belden 8760 (PN ); specify length. Former Options Code Options (Order as separate line items) 07 ORDER AS P/N Two-inch pipe/wall mounting bracket 11 ORDER AS P/N Stainless steel nameplate (specify marking) 3

8 MODEL 1181SO SECTION 2.0 INSTALLATION SECTION 2.0 INSTALLATION 2.1 UNPACKING AND INSPECTION. Before opening the shipping carton, inspect the outside of the carton for any damage. If damage is detected, contact the carrier immediately. If there is no apparent damage, open the carton and inspect the instrument and hardware. Make sure all the items in the packing list are present and in good condition. Notify the factory if any part is missing. If the instrument appears to be in satisfactory condition, proceed to Section 2.2, Mechanical Installation. NOTE: Save the original packing cartons and materials as most carriers require proof of damage due to mishandling, etc., also, if it is necessary to return the instrument to the factory, you must pack the instrument in the same manner as it was received (refer to Section 7.0 for return instructions). 2.2 MECHANICAL INSTALLATION. IMPORTANT: Do not attempt to install and operate the 1181SO without first reading this manual General. The transmitter may be installed in harsh environments. However, it should be located in an area where sources of temperature fluctuations, vibrations, and shock are at a minimum or non existent. Pick a site that is at least 12 inches away from any high voltage conduit and is easily accessed by operating and maintenance personnel Transmitter Installation. The 1181SO may be mounted on a flat surface or on a 2-inch pipe by means of a pipe mounting bracket (PN ). There are two threaded mounting holes located in the bottom of the 1181SO housing (see Figure 2-1). 2.3 SENSOR INSTALLATION. Refer to the appropriate Model Hx438 or Gx448 Sensor Instruction Manual for proper installation. Do not install the sensor until the calibration procedure is performed. 2.4 ELECTRICAL INSTALLATION Transmitter. Refer to Figure 2-2 for the wiring details of the 1181SO. See Section 1.2 for the electrical specifications. The transmitter is equipped with two 1/2-inch conduit openings, one on each side of the housing. One is for power supply and signal wiring and the other is for sensor input (see Figure 2-1). To access the terminal boards, remove the cover on the terminal (or meter) end of the transmitter, then remove the meter assembly from the transmitter housing. The upper terminal block (TB1) is for the power supply and meter connections. The lower terminal block (TB2) is for the sensor input connections Wiring Procedure. Connect the power wiring as follows: + VDC Power Supply to TB1-1 - VDC Power Supply to TB1-3 Connect the meter wiring as follows: + Meter Terminal to TB1-2 - Meter Terminal to TB1-3 Signal Wiring (4-20 ma DC output) is the same as for power supply wiring: + Loop Signal to TB1-1 - Loop Signal to TB1-3 NOTE: It is recommended that the power supply/signal wiring be twisted pairs enclosed in a shielded cable. The cable should be grounded in only one place preferably at the instrument. The instrument case shall be grounded. Signal or sensor wiring should never be run in the same conduit or open tray with AC power line, alarm, control or output signal cables. Keep signal or sensor wiring at least 12 inches from heavy electrical equipment. (Note continued on page 6). 4

9 MODEL 1181SO SECTION 2.0 INSTALLATION FIGURE 2-1 Mounting and Dimensional Drawing 5

10 MODEL 1181SO SECTION 2.0 INSTALLATION NOTE CONT. For maximum EMI/RFI protection the output cable should be shielded and enclosed in an earth grounded, rigid metal conduit. Connect the output cable s outer shield to the transmitter s earth ground via the ground terminal next to TB-1. The sensor cable should also be shielded. Connect the sensor cable s outer shield to the transmitter s earth ground via the ground terminal next to TB1. If the sensor cable s outer shield is braided an appropriate metal cable gland fitting may be used to connect the braid to earth ground via the instrument case. A new addition to the suite of tests done to ensure CE compliance is IEC This is a surge immunity test that simulates overvoltages due to switching and lightning transients. In order to meet the requirements of this test, additional protection must be added to the instrument in the form of a Transient Protector such as the Rosemount Model 470D. This is a 3½-inch tube with ½-inch MNPT threads on both ends. Inside the tube are gas discharge and zener diode devices to limit surges to the transmitter from the current loop. No additional protection is needed on the sensor connections Sensor. Carefully insert the spade lug terminated sensor cable through the conduit opening. Connect the sensor to TB2 as shown in Figure 2-2. NOTE: Conduit connections on the transmitter housing must be sealed or plugged (with a sealing compound) to avoid accumulation of moisture in the housing. Please refer to the sensor's instruction manual for additional information on its wiring. IMPORTANT: Make sure all wiring connections are correct and tight. Do not apply power to the 1181SO at this time. For wiring to the Model Hx438 and Model Gx448 Dissolved Oxygen Sensors, please see Table HAZARDOUS LOCATIONS-EXPLOSION PROOF INSTALLATION. In order to maintain the explosion proof rating for installed transmitter, the following conditions must be met: 1. The transmitter enclosure covers must be on hand tight, and the threads must not be damaged NOTE: These covers seat on O-rings which serve to provide a dust proof enclosure for Class II and Class III installations. 2. Conduit must be properly installed with appropriate seals. 3. If one of the conduit connections on the housing is not used, it must be closed with a threaded metal plug with at least five threads engaged. 4. The serial tag cover on the external ZERO and SPAN adjustments must be in place. 5. FM Explosion proof installation must be in accordance with Drawing Number (See Figure 2-3). 6. Due to the nature of the measurement, sensors cannot be designed to meet explosion proof certification. If the sensors must be installed in hazardous area locations, Rosemount Analytical Inc. recommends that an intrinsically safe system be installed. 2.6 HAZARDOUS LOCATIONS-INTRINSICALLY SAFE INSTALLATION. To secure and maintain intrinsically safe installations for the appropriate approval agency, the following conditions must be met: 1. Code 67 must be specified when ordering F.M. units. Installation must be in accordance with Drawing Number (Figure 2-4 Entity Approved Installation). 2. Code 69 must be specified when ordering CSA units and installation must be performed in accordance with Drawing Number (Figure 2-5). 3. Code 73 must be specified when ordering CENELEC units and installation must be performed in accordance with Drawing Number (Figure 2-6). 6

11 MODEL 1181SO SECTION 2.0 INSTALLATION FIGURE 2-2. Model 1181 SO Wiring Details TABLE 2-1. Wiring Model 1181 SO Transmitter to Model Hx438 and Gx448 DO Sensors TB2 MEASUREMENT WIRE COLOR 1 RTD IN Blue 2 RTD Sense Yellow 3 Cathode Clear 4 Anode Brown Ground Yellow/green 7

12 MODEL 1181SO SECTION 2.0 INSTALLATION DWG. NO. REV C FIGURE 2-3. FM Explosion-Proof Installation 8

13 MODEL 1181SO SECTION 2.0 INSTALLATION FIGURE 2-4. FM Intrinsically Safe Installation and Entity Parameters (1 of 3) [continued on following page] 9

14 MODEL 1181SO SECTION 2.0 INSTALLATION FIGURE 2-4. FM Intrinsically Safe Installation and Entity Parameters (2 of 3) [continued on following page] 10

15 MODEL 1181SO SECTION 2.0 INSTALLATION FIGURE 2-4. FM Intrinsically Safe Installation and Entity Parameters (3 of 3) 11

16 MODEL 1181SO SECTION 2.0 INSTALLATION 12 FIGURE 2-5. CSA Intrinsically Safe Installation

17 MODEL 1181SO SECTION 2.0 INSTALLATION DWG. NO. REV C FIGURE 2-6. CENELEC Intrinsically Safe Installation (1 of 3) [continued on following page] 13

18 MODEL 1181SO SECTION 2.0 INSTALLATION DWG. NO. REV C FIGURE 2-6. CENELEC Intrinsically Safe Installation (2 of 3) [continued on following page] 14

19 MODEL 1181SO SECTION 2.0 INSTALLATION DWG. NO. REV C FIGURE 2-6. CENELEC Intrinsically Safe Installation (3 of 3) 15

20 MODEL 1181SO SECTION 3.0 CONFIGURATION, START UP, AND CALIBRATION SECTION 3.0 CONFIGURATION, START UP AND CALIBRATION 3.1 GENERAL. This section provides the configuration, start up and calibration procedures for the Model 1181SO Two-Wire Transmitter. The transmitter is used in conjunction with the Rosemount Model Hx438 or Gx448 Steam Sterilizable Dissolved Oxygen Sensor and the Rosemount Model 515 Power Supply. (Refer to Section 4.3 for 1181SO's Description of Controls.) 3.2 CONFIGURATION SO with Analog Meter (Option-03). The desired range may be selected by placing the Range Dip Switches in their proper positions. The analog meter has a scale with three different ranges of mm Hg, mm Hg, and mm Hg. The analog meter is proportionally activated by the transmitter's 4-20 ma output. The oxygen concentration is obtained by reading the position of the needle on the pre-selected range on the meter face. NOTE: A special meter face may be ordered to read in your desired scale units. Consult the factory SO with LCD (Option-06). The LCD Meter has its own zero and span adjustment pots for further calibration. The 1181SO with LCD meter (Option-06) may be configured to read directly in mm Hg, mg/l or ppm, % O 2 or % saturation (see Table 3-1) for various ranges and units and their corresponding range dip switch positions). 3.3 START UP. Start up the 1181SO by performing the following procedures: 1. Make sure the 1181SO is properly wired. (refer to Figure 2-2) 2. Power up the 1181SO. 3. Set the range dip switches to "STBY" (Stand-by). When the transmitter is powered up, a polarization voltage is applied between the anode and the cathode. The sensor (electrode) current is initially very high then it falls off quickly and settles down to a steady state after a few hours. Since this polarization period is relatively long, it is recommended to leave the 1181SO powered up with the range switch set to Stand-by even when not in use. Setting the range switch to Stand-by allows the sensor to be polarized while preparing for calibration or while undergoing routine maintenance. This also prevents the sensor from being oxygen saturated. Sensor life will not be shortened under these conditions because only a very small current flows through the sensor. If for any reason the sensor has to be disconnected (or the transmitter switched off) the sensor will have to be repolarized before it can be ready for further operation Sensor Current. During the polarization period, the sensor (electrode) current will fall off even in oxygen free solutions. For this reason, an excessive zero current (sensor current at 0 mm Hg oxygen) may indicate an incomplete polarization. Though the zero current of the sensor is usually negligibly small and almost identical with the 1181SO's zero point, the sensor zero point should be checked periodically since an excessive zero current may indicate a failing sensor (refer to the Model Hx438 or Gx448 Sensor Manual for additional information on sensor zero) Zero Point Calibration. Prepare the calibration set up as shown in Figure 3-1 (refer to the sensor's instruction manual for additional information on zero point calibration. A. For low oxygen concentrations, or when the sensor zero current exceeds 2-5% of full scale. 1. Follow Start up procedure (Section 3.3). Allow three (3) hours for polarization period if the transmitter was just powered up. 2. Set the range dip switches in their proper positions for the desired range. 3. Place the sensor in a freshly prepared, bubble free, 2% bisulphite solution, or expose the sensor in pure nitrogen gas. Let it stabilize. 4. When the reading is stable, adjust the external zero pot to get a reading of 4 ma DC on M1. 16

21 MODEL 1181SO SECTION 3.0 CONFIGURATION, START UP CALIBRATION 5. If you have an analog meter (Option - 03), the indicating needle should be right at 0.The needle may be set to 0 by adjusting the screw at the bottom front of the meter. If you have an LCD digital meter (Option - 06), a 0 reading may be obtained by adjusting the LCD meter's own zero pot. 6. Proceed to Span Calibration, Section 3.4. B. If the sensor zero current is within the desired measuring accuracy (below 2% of full scale) or sensor current is near zero at 0 mm Hg: 1. Perform Steps 1-3 of Section 3.3.2, A. 2. Place the sensor in air or in an agitated, bubble free water (see Figure 3-2). Let it stabilize. 3. When the reading is stable, disconnect the cathode sensor lead (White) from TB Perform Steps 4 and 5 of Section 3.3.2, A. 5. Reconnect the cathode sensor lead (White) to TB Proceed to Span Calibration, Section 3.4. FIGURE 3-1. Calibration Set Up 17

22 MODEL 1181SO SECTION 3.0 CONFIGURATION, START UP, CALIBRATION 3.4 SPAN CALIBRATION General. The 1181SO may be span calibrated using fresh water or ambient air. The calculated span calibration value should be at least 70% of the maximum scale reading to ensure optimum accuracy. Table 3-1 shows the different ranges and units with their corresponding range dip switch positions. (See Figure 4-2.) 4 ma DC output corresponds to your zero or minimum reading on the scale selected and 20 ma DC output corresponds to the maximum reading on the scale selected. Calibration in a fermentor may be performed only after sterilization because sterilization may alter the sensor's (electrode's) span (slope). This alteration may be comparatively large, particularly when a membrane cartridge is used for the first time. After cooling, the fermentor is aerated. As soon as the reading is stable, the desired calibration point is set. In large-size aerated fermentors the sensor should be calibrated in place after sterilization. Calibration should be carried out under flow, aeration and pressure conditions approximating as closely as possible those conditions expected to be encountered in measurement. During measurement, the temperature and pressure in the fermenter should remain constant. The O 2 measuring loop should be recalibrated prior to each fermentation. If work is performed under sterile conditions, the system must be calibrated with the sensor (electrode) in place and after sterilization but prior to inoculation. If the sensor is employed to monitor a fermentation process that extends over several days (or weeks) with no possibility of changing it, the electrical zero point of the sensor should be checked before insertion. Please refer to the sensor manual for instructions on sensor calibration. TABLE 3-1 Range -vs- Dip Switch Position (see Figure 4-2) UNITS DESIRED RANGE DIP SWITCH POSITION (4mA -20mA) SWITCH TO USE C1 C2 C4 C mm Hg 0-100* Closed Closed Open Not mm Hg Open Closed Used mm Hg Closed Open ppm (mg/l) 0-100* Closed Closed ppm (mg/l) Open Closed ppm (mg/l) Closed Open %O * Closed Closed %O Open Closed %O Closed Open 0-100% Saturation Open Closed *Note: The unit is supplied from the factory in the range. 18

23 MODEL 1181SO SECTION 3.0 CONFIGURATION, START UP, AND CALIBRATION General Span Calibration Procedure. Make sure zero point calibration (Section 3.3.2) was properly performed. Make sure the 1181SO is still powered up (refer to Figure 3-1). 1. Expose the sensor in the calibrating medium. Allow up to 60 minutes for the reading to stabilize. 2. When the reading is stable, adjust the external span pot to the minimum reading (see Figure 4-2). 3. Set the coarse span adjust pot to get a ma display on M1 to equal (see Figure 4-2): Calibration Value Maximum Scale Reading of Range Selected 4. Fine tune using the external span pot. NOTE: The analog meter (Option-03) is proportionally activated by the 1181SO's 4-20mA output. The LCD Meter (Option - 06), on the other hand, may be further calibrated by adjusting its own span (R4) and zero (R8) adjustment pots (see Figure 4-3). 5. For units with LCD Meter, adjust the LCD's own span pot to get a reading on the meter display equal to the calibration value. 6. Recheck for zero and span until no further adjustment is necessary. 7. Disconnect the digital Ammeter M1. Reconnect the power supply and the indicating meter wiring according to Figure 2-2. Replace the transmitter covers. 8. Install the sensor as instructed in the sensor's instruction manual Calibration Medium. X A. AMBIENT AIR. The 1181SO may be span calibrated by exposing the sensor to ambient air. Air contains 20.9% oxygen (volume % or pressure %) the calibration point or value should be: BP mm Hg x mm Hg B. CALIBRATION UNDER PRESSURE. The Barometric Pressure (BP), temperature, and the excess pressure (Pp), if any, in the reaction vessel must be known to calculate the calibration value. Calibration Value = (BP + Pp - Pv) X0.209 the output display on M1 should be: (BP + Pp -Pv) ma = x Maximum Full Scale Reading at range selected, mm Hg WHERE: ma = Milliamps DC display in M1 that the 1181SO should be adjusted to (see Steps 3 and 4, Section 3.4.2). The LCD's own span adjust pot is set to get an LCD display of: (BP + Pp - Pv) mm Hg, the partial pressure of oxygen at a given time. (see Step 5., Section 3.4.2). BP = Barometric Pressure in mm Hg Pp = Process Pressure in mm Hg Pv = Water Vapor Pressure in mm Hg If the BP is given in inches Hg, convert this to mm Hg by multiplying it by a factor of EXAMPLE: BP = 25.4 X = 766 mm Hg mm Hg Range Selected: ( ) ma output = X = ma DC on M1 ² mm Hg LCD Display If mm Hg is Selected: BP = in Hg Pp = 100 mm Hg Pv = 30 mm Hg (from Table 3-2) Temp. = 29 C ma Output = ( ) X = 7.5 ma DC on M1 ² mm Hg LCD Display 19

24 MODEL 1181SO SECTION 3.0 CONFIGURATION, START UP, AND CALIBRATION Calibration Medium (continued) Where large reaction tanks are involved, the hydrostatic pressure (10 m head of water corresponds to 735 mm Hg) must be taken into account. In the absence of air bubbles the hydrostatic pressure exercises negligible influence on the oxygen partial pressure. In aerated fermentors conditions are quite complex. The oxygen sensor is under substantial hydrostatic pressure and calibration in mm Hg is unsuitable. In such cases, the degree of saturation with atmospheric oxygen is the most suitable parameter. TABLE 3-2 Water-vapor partial pressure in mm Hg: Temp. Pv Temp. Pv C mm Hg C mm Hg C. FRESH WATER SATURATED WITH AIR. The 1181SO may also be span calibrated by immersing the sensor in a beaker of agitated fresh water (see Figure 3-2). In determining oxygen concentration of solutions, the O 2 content of the calibrating solution must be accurately known. The values applying to fresh water are known and shown in Table 3-3. These solubilities need only be adjusted to the prevailing barometric pressure, (BP). Solubility 760 mm Hg X BP Solubility (S) = 760 mm Hg This calibration is reliable only if measurements are affected in dilute aqueous solutions. In concentrated solutions the oxygen solubility must first be determined by a Winkler titration. Temp. TABLE 3-3 Solubility of Oxygen, mg/l (ppm) at Various Temperatures and Elevations in Fresh Water (Based on Sea Level Barometric Pressure of 760 mm Hg) C The ma output display on M1 should be: ma = X BP mm Hg X Maximum Full Scale Reading at range selected, mm Hg The LCD span should be set to read, S: EXAMPLE: Elevation, Feet above Sea Level Solubility at 760 mm Hg S= X BP mm Hg 760 Temperature = 20 C Elevation = 0 ft. BP = 30.1 m Hg range selected mm Hg BP mm Hg = 30.1 X 25.4 = mm Hg From Table 3-3 solubility at 760 mm Hg, at 20 C and 0ft. elevation = 9.1 ppm. 20

25 MODEL 1181SO SECTION 3.0 CONFIGURATION, START UP, AND CALIBRATION Calibration Medium (continued) (764.5) ma Output = X = ma 200 At this point, the LCD's span pot can also be made to read in %O 2 (if desired) to: 20.9% to indicate %O 2 or 100% to indicate the % saturation. (A solution saturated with air is defined as 100% saturated). Adjust LCD's span pot to S: S = 9.1 (764.5) 760 = 9.15 ppm (mg/l) FIGURE 3-2. Calibration with Agitated Fresh Water 21

26 MODEL 1181SO SECTION 4.0 OPERATION AND DESCRIPTION OF CONTROLS SECTION 4.0 OPERATION AND DESCRIPTION OF CONTROLS 4.1 THEORY OF OPERATION. The Model 1181SO Two- Wire Transmitter automatically and continuously measures concentrations of dissolved oxygen in water or aqueous solutions. The determination is based on the measurement of the electrical current developed by the Model Hx438 or Gx448 sensor in contact with the sample. The polarographic (Clark's principle) membrane technique is used for the measurement and control of dissolved oxygen.the success of membrane electrodes stems from the isolation of the electrodes (cathode and anode) and electrolyte from the sample by means of a semi-permeable membrane. This membrane protects the electrodes from contamination by restricting the flow of sample to gases only, and oxygen in particular. Within the body of the sensor are a platinum cathode and a silver anode, electrically connected by potassium chloride electrolyte solution and separated from the process stream by the gas permeable membrane. The transmitter lifts off approximately 10 VDC from the loop current to power the electronics and, in turn, supplies a constant 675mV DC polarizing voltage which is applied across the two electrodes. Oxygen from the sample diffuses through the membrane and is reduced at the platinum cathode. The resultant electrical current flow between anode and cathode is proportional to the partial pressure of oxygen in the sample. The chemical reactions which accompany this process are as follows: Platinum cathode: O 2 + 2H 2 O + 4e - 4OH- Silver anode: 4Ag + 4Cl - 4AgCl + 4e- The reaction that takes place at the anode is the oxidation of silver to form silver chloride. This reaction is offset at the platinum cathode by the reduction of oxygen molecules to hydroxyl ions. The resulting current is directly proportional to the dissolved oxygen content of the sample stream. FIGURE 4-1. Oxygen Solubility in Fresh and Seawater of Varying Degrees of Salinity, BP = 760 mm Hg 22

27 MODEL 1181SO SECTION 4.0 OPERATION AND DESCRIPTION OF CONTROLS Basic D.O. Measurement. 1. Dissolved Oxygen - The amount of gaseous oxygen, in mg/l, or ppm by weight, dissolved in a liquid (usually H 2 O). The presence of dissolved solids affects the solubility of oxygen in water. 2. The amount of oxygen dissolved in fresh water at 100% saturation is inversely proportional to the temperature, and is directly proportional to the pressure. 3. At sea level and a temperature of 20 C, an oxygen saturated solution of water contains 9.2 ppm (parts per million) of oxygen. The figure of 9.2 ppm represents the weight of oxygen with respect to the weight of water. 4. A polarographic oxygen sensor measures oxygen in air as well as in water. In fact, most sensors are air calibrated prior to water measurements. 5. The mineral content of water solution will also alter the amount of dissolved oxygen. For example, salt water in the ocean at 20 C contains only 7.4 ppm of dissolved oxygen compared to fresh water which contains 9.2 ppm. This difference may account for the fact that some fish cannot survive when moved from fresh to salt water and vice versa. 4.2 MEASUREMENT VARIABLES. Variables that influence the dissolved oxygen measurement include barometric pressure, relative humidity, sample temperature, interfering gases and composition of the liquid medium Barometric Pressure. Rate of oxygen diffusion through the sensor membrane, and therefore the sensor response, is linear with respect to oxygen partial pressure (assuming constant sample temperature). At the normal sea-level barometric pressure of 760 mm Hg, the oxygen partial pressure of dry air is 160 mm Hg. As atmospheric pressure deviates from the standard value, the oxygen partial pressure varies proportionally. Accordingly, the solubility of oxygen in water varies in proportion to the change in the partial pressure of oxygen in air. Barometric pressure is therefore a significant factor in instrument calibration. Since dry air contains 20.95% oxygen by volume, regardless of the barometric pressure, oxygen can be shown to be directly proportional to the total barometric pressure, according to Dalton's law of partial pressures. Thus for dry air, if the total barometric pressure is known, the partial pressure of oxygen can be computed. However, this procedure is valid only for dry air conditions. Humid air has the effect of reducing the partial pressure of oxygen and the other gases in the air without affecting the total barometric pressure. Thus, for constant barometric pressure, if the humidity in the air is other than zero, the partial pressure of oxygen is less than the value for dry air. For most measurements taken below 80 F (26.7 C), the effect of water vapor may be ignored. To determine the partial pressure of oxygen in air at various levels of humidity and barometric pressure, the partial pressure of water is subtracted from the total barometric pressure and the difference is multiplied by 20.95%. EXAMPLE: If the Barometric pressure = 740 mm Hg and the Partial Pressure H 2 O = 20 mm Hg then the Partial pressure O 2 = [740-20] x mm Hg = 151 mm Hg Sample Temperature. The temperature of the sample affects sensor response in two ways: 1. Oxygen Diffusion Rate -- The rate of oxygen diffusion through the sensor membrane varies with temperature at a coefficient of about +3% per degree Celsius, causing a corresponding change in sensor current. 2. Oxygen Solubility -- In an oxygen-saturated liquid, partial pressure of dissolved oxygen is equal to the partial pressure of oxygen in the atmosphere above liquid. This relationship holds true regardless of the oxygen concentration. As sample temperature increases, oxygen partial pressure remains unchanged (except as influenced by vapor pressure of the liquid); however, the dissolved oxygen concentration is reduced Relative Humidity. In calibration for dissolved oxygen measurement, one method is to expose the sensor to a gaseous sample, typically dry air, of accurately known oxygen content. The known gaseous oxygen concentration value is then related to a corresponding dissolved oxygen value. 23

28 MODEL 1181SO SECTION 4.0 OPERATION AND DESCRIPTION OF CONTROLS Sample Temperature (continued) To compensate for temperature, the Model 1181SO uses the thermistor incorporated in the Model Hx438 or Gx448 sensor. As the sample temperature changes, the thermistor resistance also changes affecting the signal gain of the transmitter. The result is a temperature corrected dissolved oxygen reading Interfering Gases. Gases that are reduced or oxidized at about VDC, and thus contribute to sensor current, may cause a readout error. Only a few gases have this characteristic. Common gases that should be avoided include SO 2, Cl 2 and oxides of nitrogen. Low-level concentrations of hydrogen-sulfide tend to contaminate the sensor, but do not seriously affect dissolved oxygen measurement. If contaminated, the sensor must be rejuvenated Composition of the Liquid Medium. A significant change in the composition of the solution may change the solubility of oxygen. If the solvent is water, the addition or presence of any water soluble components, such as sodium chloride, may change the dissolved oxygen concentration. In an open equilibrium system, where gas of constant oxygen partial pressure is in direct contact with a salt solution, the solubility of oxygen decreases as salinity increases. 4.3 DESCRIPTION OF CONTROLS. (Refer to Figure 4-2 for location of control or adjustment pots, etc.) Range Selector Switch. There are four range dip switches: C1, C2, C3 and C4. The desired range of the 1181SO may be selected by "closing" or "opening" the switches according to the matrix shown on the PCB cover in Figure 4-2. NOTE: C3 is not used in any range. EXAMPLE: If a range of mm Hg is desired, C2 is in closed position, while Cl and C4 are in open position (see Table 3-1). If your desired reading is in mg/l or ppm of dissolved oxygen: For mg/l (ppm) use mm Hg range dip switch setting For mg/l (ppm) use mm Hg range dip switch setting For mg/l (ppm) use mm Hg range dip switch setting If your desired reading is % saturation (a solution saturated with air is said to be 100% saturated): Use mm Hg range dip switch setting. If your desired reading is % oxygen: For % O 2 use mm Hg range dip switch setting For % O 2 use mm Hg range dip switch setting For % O 2 use mm Hg range dip switch setting In the "STBY" (Stand By) position, Cl, C2 and C4 are in closed position. The "STBY" position is used to keep the sensor polarized (when the 1181SO is powered up). This saves considerable repolarization time after a periodic maintenance in the process, troubleshooting or temporary shut down Coarse Span Adjust. A printed circuit board mounted potentiometer (280 turn) used for coarse adjustment of the operating range for the 1181 transmitter (refer to Figure 4-2) External Zero Adjust. A 20-turn potentiometer for fine tuning the low end current output value with respect to the low end of the measurement range selected by the Range Selector Dip Switches (refer to Figure 4-2) External Span Adjust. A 20-turn potentiometer for fine tuning the full scale current output with respect to the full scale value of the measurement range selected by the Range Selector Dip Switches (refer to Figure 4-2) LCD Zero and Span. Printed circuit board mounted potentiometers for adjustment of the LCD display. The display can be adjusted for any value from 0 to 1999 to match the transmitter's 0-20 ma DC output (refer to Figure 4-3 for the location) LCD Decimal Point Switch. Dip switches 1, 2 and 3 for the selection of the decimal point in the digital display is located about 5 o'clock of the meter face (refer to Figure 4-3). A closed position turns on the decimal point while an open position turns off the decimal point. When all the dip switches are off, the decimal point is assumed to be after the rightmost digit. 24

29 MODEL 1181SO SECTION 4.0 OPERATION AND DESCRIPTION OF CONTROLS PCB COVER RANGE MATRIX FIGURE 4-2. Location of Controls 25

30 MODEL 1181SO SECTION 4.0 OPERATION AND DESCRIPTION OF CONTROLS Ranges: Units TABLE 4-1 LCD Decimal Point Set Up mm Hg mm Hg mm Hg mm Hg mg/l (ppm) %O % Saturation Converting an 1181SO with an existing blind or analog indication to an LCD (digital) unit. (Option 06). See Section 5.2 for disassembly. The 1181SO with an Option -03 (analog display) or Option -02 (blind) may be retrofitted or modified easily to an LCD (digital) unit. The jumper is simply moved from the W5 position to the W6 position (see Figure 4-3). After moving the jumper to W6 position, the 1181SO will only be compatible with an LCD meter (refer to Section for the proper wiring of the LCD meter to the 1181SO). FIGURE SO LCD Meter Option 26

31 MODEL 1181SO SECTION 5.0 DIAGNOSTICS AND MAINTENANCE SECTION 5.0 DIAGNOSTICS AND MAINTENANCE 5.1 GENERAL. The 1181SO was designed to nearly eliminate the need for frequent or routine maintenance. Most routine maintenance involves the sensor. Sensor maintenance consists of periodic recharging and cleaning, or rejuvenating the sensor cathode. The usual indication that the sensor requires rejuvenation and recharging is that, during calibration the correct upscale reading is unobtainable by adjustment of the EXTERNAL SPAN. Normally, the inability to calibrate is preceded by a gradual, day-to-day reduction in sensor output, with a resultant lower instrument indication. The rate of reduction increases with the increase in internal resistance of the sensor. (Please refer to the appropriate section in the Model Hx438 or Gx448 Sensor Instruction Manual for Sensor Diagnostics and Maintenance). 5.2 DISASSEMBLY PROCEDURE. Disconnect the power to the transmitter prior to disassembly (refer to Figure 6-1 for item numbers also see Figure 2-2). 1. Remove covers (1) and (10) from housing (3). Save O-rings (2); discard if damaged. 2. Loosen screws retaining the serial label, and then rotate to gain access to the span and zero pots. 3. Align the span and zero adjusting screws (4), so the slots are horizontal, pointing end cap to end cap. Refer to Figure In the circuit side of the housing (3) remove the circuit board retaining screws, washers and matrix cover (9). The matrix cover is secured to screws by nylon split washers. Remove the screws in equal increments, so the matrix cover is not damaged. 5.3 REASSEMBLY PROCEDURE (see Figures 6-1, 6-5 and 2-2). 1. Assemble the circuit board assemblies (6,7,8) by first aligning the connectors with the respective pins, and then pushing straight in. Install screw which holds circuit board assemblies together. 2. Align the zero and span adjusting screws (4) on the housing (3) to the horizontal position, slots pointing end cap to end cap (see Figure 4-2). 3. Align the zero and span potentiometers located on the power circuit board (7) to the horizontal position, with blades perpendicular to PCB's (6) and (7). 4. Place the circuit board assemblies (6, 7, 8) into housing by first aligning the connector pins with the terminal receptacles in the base of the housing (3) and then pushing straight in on the signal conditioning board (8). 5. Install the matrix cover (9) and secure with screws and washers. 6. Inspect the thread connections on housing (3) to make sure five undamaged threads will fully engage. 7. Replace O-rings (2) on housing (3). Use new O- rings if the old ones were damaged. 8. Install covers (1,10) on transmitter housing (3). 9. Apply power to the transmitter and perform the appropriate calibration procedure if necessary. 5. Pull straight out on the signal conditioning board assembly (8) to remove circuit boards from housing (3). 6. To separate the individual boards, remove the retaining screw located on the terminal side of the transmitter board (6). 7. Remove each printed circuit board assembly by pulling straight out from their respective connectors. 27

32 MODEL 1181SO SECTION 5.0 DIAGNOSTICS AND MAINTENANCE 5.4 TROUBLESHOOTING. In the event of a malfunction, refer to the Troubleshooting Guide (Table 5-1) below. This is intended as a guide and lists the troubles in order of probable frequency of occurance. Do not be misled by the troubles, always look for the cause before trying the remedy. TABLE 5-1 TROUBLESHOOTING GUIDE SYMPTOM CAUSE ACTION 1. Abnormally high O 2 readings(inability to calibrate). a. Hole in membrane. Replace membrane. b. Gold cathode loose. Replace sensor. c. Open thermistor. Replace sensor. 2. Abnormally low O 2 readings (inability to calibrate). a. High internal cell Rejuvenate and resistance. recharge cell. b. Membrane too loose. Tighten cap or replace membrane. c. Contaminated Clean sensor and Electrolyte.* recharge. d. Shorted thermistor. Replace sensor. 3.Sensor noisy (motion sensitive). a. Membrane loose. Replace membrane. b. Low electrolyte level. Fill properly. c. Cathode contaminated.* Rejuvenate and recharge. 4.Upscale reading with known oxygen-free sample. a. Gold cathode loose. Replace sensor. 5.Slow response (sluggish). a. Contaminated Clean sensor and Electrolyte.* recharge. * Contamination may be the normal accumulation from long-term operation, indicating standard rejuvenation is required. Please refer to the sensor manual for detailed information on troubleshooting. 28

33 MODEL 1181SO SECTION 5.0 DIAGNOSTICS AND MAINTENANCE SO OPERATION CHECK. When the 1181SO is suspected to be malfunctioning, the operation may be checked by the set-up shown in Figure Equipment needed: 1181SO Transmitter D1, Meter Display (Analog with Option 03 or LCD with Option 06) Model 515 Power Supply M1, Digital Ammeter Resistor, 23 K Resistance Decade Box, 0-30 M Operation Check-Up Procedure: 1. Prepare the set-up as shown in Figure Enter: 21.0 Megohms for mm Hg range Megohms for mm Hg range Megohms for mm Hg range. 3. Set the Range Dip Switches in your desired range. 4. Power up the 1181SO. 5. Disconnect Terminal 3 of TB2. NOTE The LCD's zero pot may be adjusted to get a zero reading on M1, if desired. 7. Reconnect TB2-3. Allow M1 to stabilize. 8. Adjust the External Span pot to get a minimum ma reading on M1. 9. Adjust the Course Span pot to get a reading of 20mA DC on M1. NOTE If the 1181SO is functioning properly, the 4 and 20mA DC output should be obtained without any difficulties. The LCD's span pot may be adjusted to display the maximum reading in the range selected, if desired. The 1181SO must be recalibrated before putting it back in service. 10. Fine tune with the External Span pot if necessary. 6. Adjust the External Zero pot to get a reading of 4mA DC on M1. FIGURE SO Operation Check Set-Up 29

34 MODEL 1181SO SECTION 6.0 SPARE PARTS 6.1 SPARE PARTS. Parts List for Figure 6-1. SECTION 6.0 SPARE PARTS 30 ITEM PART NUMBER DESCRIPTION QTY Cover (for Blind Model) 2 Cover PCB End O-Ring Kit, consists of: O-Ring Housing (Includes #4 below) 1 3A Housing for Code-73 (includes #4 below) Adjustment Screw, consists of: Retaining Ring O-Ring Screw, Adjustment Zero/Span O-Ring Kit, consists of: O-Ring Transmitter PCB (Blind/Analog) Transmitter PCB (LCD RTO) Power PCB Transducer PCB Matrix Cover Kit, consists of: Cover, Matrix Screw (Short) Screw (Long) Washer, Nylon Washer, Flat Washer, Lock Meter Cover Kit, consists of: Housing O-Ring Window Ring, Retainer O-Ring Kit, consists of: O-Ring Window Kit, consists of: O-Ring Window Meter, LCD (Code 06) Shown Analog Meter Sleeve Kit, consists of: Sleeve Meter, Analog Screw, Set (Short) Screw, Set (Long) Nut, Hex Digital Meter Retrofit Kit, consists of: Spare LCD Meter Code Sleeve for LCD Plug-In Analog Meter Retrofit Kit, consists of: Analog Meter, Plug-In (Code 03) Mounting Plate Mounting Plate Screws Insulator Terminal Plug-In Adaptor Screws Retainer Clip 1

35 MODEL 1181SO SECTION 6.0 SPARE PARTS Figure 6-1. Model 1181SO Parts Breakdown 31

36 MODEL 1181SO SECTION 6.0 SPARE PARTS P/N Shown (Blind and Analog units) P/N (LCD units) Figure SO Transmitter PCB P/N Figure SO Transducer PCB 32

37 MODEL 1181SO SECTION 6.0 SPARE PARTS P/N Figure SO Power Supply PCB Figure SO PCB Stack 33

38 MODEL 1181SO SECTION 7.0 RETURN OF MATERIAL SECTION 7.0 RETURN OF MATERIAL 7.1 GENERAL. To expedite the repair and return of instruments, proper communication between the customer and the factory is important. Before returning a product for repair, call for a Return Materials Authorization (RMA) number. 7.2 WARRANTY REPAIR. The following is the procedure for returning instruments still under warranty: 1. Call Rosemount Analytical for authorization. 2. To verify warranty, supply the factory sales order number or the original purchase order number. In the case of individual parts or sub-assemblies, the serial number on the unit must be supplied. 3. Carefully package the materials and enclose your Letter of Transmittal (see Warranty). If possible, pack the materials in the same manner as they were received. 4. Send the package prepaid to: 7.3 NON-WARRANTY REPAIR. The following is the procedure for returning for repair instruments that are no longer under warranty: 1. Call Rosemount Analytical for authorization. 2. Supply the purchase order number, and make sure to provide the name and telephone number of the individual to be contacted should additional information be needed. 3. Do Steps 3 and 4 of Section 7.2. NOTE Consult the factory for additional information regarding service or repair. Rosemount Analytical Inc., Uniloc Division Uniloc Division 2400 Barranca Parkway Irvine, CA Attn: Factory Repair RMA No. Mark the package: Returned for Repair Model No. 34

39 WARRANTY Seller warrants that the firmware will execute the programming instructions provided by Seller, and that the Goods manufactured or Services provided by Seller will be free from defects in materials or workmanship under normal use and care until the expiration of the applicable warranty period. Goods are warranted for twelve (12) months from the date of initial installation or eighteen (18) months from the date of shipment by Seller, whichever period expires first. Consumables, such as glass electrodes, membranes, liquid junctions, electrolyte, o-rings, catalytic beads, etc., and Services are warranted for a period of 90 days from the date of shipment or provision. Products purchased by Seller from a third party for resale to Buyer ("Resale Products") shall carry only the warranty extended by the original manufacturer. Buyer agrees that Seller has no liability for Resale Products beyond making a reasonable commercial effort to arrange for procurement and shipping of the Resale Products. If Buyer discovers any warranty defects and notifies Seller thereof in writing during the applicable warranty period, Seller shall, at its option, promptly correct any errors that are found by Seller in the firmware or Services, or repair or replace F.O.B. point of manufacture that portion of the Goods or firmware found by Seller to be defective, or refund the purchase price of the defective portion of the Goods/Services. All replacements or repairs necessitated by inadequate maintenance, normal wear and usage, unsuitable power sources, unsuitable environmental conditions, accident, misuse, improper installation, modification, repair, storage or handling, or any other cause not the fault of Seller are not covered by this limited warranty, and shall be at Buyer's expense. Seller shall not be obligated to pay any costs or charges incurred by Buyer or any other party except as may be agreed upon in writing in advance by an authorized Seller representative. All costs of dismantling, reinstallation and freight and the time and expenses of Seller's personnel for site travel and diagnosis under this warranty clause shall be borne by Buyer unless accepted in writing by Seller. Goods repaired and parts replaced during the warranty period shall be in warranty for the remainder of the original warranty period or ninety (90) days, whichever is longer. This limited warranty is the only warranty made by Seller and can be amended only in a writing signed by an authorized representative of Seller. Except as otherwise expressly provided in the Agreement, THERE ARE NO REPRESENTATIONS OR WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, AS TO MERCHANTABILITY, FIT- NESS FOR PARTICULAR PURPOSE, OR ANY OTHER MATTER WITH RESPECT TO ANY OF THE GOODS OR SERVICES. RETURN OF MATERIAL Material returned for repair, whether in or out of warranty, should be shipped prepaid to: Emerson Process Management Liquid Division 2400 Barranca Parkway Irvine, CA The shipping container should be marked: Return for Repair Model The returned material should be accompanied by a letter of transmittal which should include the following information (make a copy of the "Return of Materials Request" found on the last page of the Manual and provide the following thereon): 1. Location type of service, and length of time of service of the device. 2. Description of the faulty operation of the device and the circumstances of the failure. 3. Name and telephone number of the person to contact if there are questions about the returned material. 4. Statement as to whether warranty or non-warranty service is requested. 5. Complete shipping instructions for return of the material. Adherence to these procedures will expedite handling of the returned material and will prevent unnecessary additional charges for inspection and testing to determine the problem with the device. If the material is returned for out-of-warranty repairs, a purchase order for repairs should be enclosed.

40 The right people, the right answers, right now. ON-LINE ORDERING NOW AVAILABLE ON OUR WEB SITE Credit Cards for U.S. Purchases Only. Emerson Process Management Liquid Division 2400 Barranca Parkway Irvine, CA USA Tel: (949) Fax: (949) Rosemount Analytical Inc. 2003