3TX-DO Dissolved Oxygen Controller, Transmitter & Datalogger

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1 3TX-DO Dissolved Oxygen Controller, Transmitter & Datalogger KEY FEATURES & BENEFITS AST-DO is a proven membrane covered self-polarizing active style galvanic cell that generates a low-impedance millivolt electrical signal proportional to the oxygen pressure it senses. Extremely low initial commissioning cost and residual cost of ownership. For most applications included materials are sufficient to perform measurement for 3 to 5 years time. Rugged submersible sensor suitable for most any municipal and industrial wastewater, aquaculture or environmental use Galvanic type DO sensor there is a true zero and so no zero adjustment is ever needed Many environmental monitoring & municipal and industrial wastewater treatment plants are devoting more money and time for the measurement dissolved oxygen than necessary due high costs of many competitors transmitters and sensors. Simple, low-cost & easy to use 3TX-DO & 3TX-DO-T transmitters have all features that are needed such as: o o Display and output dissolved oxygen levels in ppm and percent (%) saturation units plus temperature in C via both analog 4-20mA and optionally RS485 MODbus Calibrations and process readings corrected for temperature, air pressure and salinity Omitting costly features that are rarely if ever used saves substantial money on initial commissioning. Measure from 0-4 to ppm (0-40%to 0-400% saturation); Fixed 0.01ppm resolution anywhere in the range DO transmitter & sensor rated to 0-50 C (0-122 F) Modular 3TX series allows for any mix of modules for ph, ORP, ISE, DO & conductivity measurement and/or control Gain calibration performed with sensor dry in air; 3TX-DO has correct calibration value stored at any temperature & pressure o Adjustment for gain via automatic or manual mode. No look-up tables and no solutions required to calibrate your DO sensor with the 3TX-DO! Due to unique electrolyte chemistry and design combined with rugged membrane technology, the calibration, cleaning and replacement needs are quite minimal and easy to perform Close-Up of the fully submersible AST-DO-T Galvanic DO sensor with Pt100 TC is above. Optional NPT submersible assembly option is installed in photo of the model shown above. Inline Low-Flow Cell mounting adapters are also available (inquire to factory for details).

2 SPECIFICATIONS: 3TX- DO Dissolved Oxygen Analyzer / Transmitter / Controller Measurement Type and Purpose: Application Range (AST-DO): Displayed Concentration Range: Resolution: Output Scaling: Lowest Displayed Limit of Detection: Sample ph Range: Sample Temperature Range: Pressure Range: Sample Flow Requirements: DO Sensor Specifications: Special Features: Display: Power Supply: Signal Output: Instrument Mounting & Dimensions: Module Description & Options: Galvanic (active self-polarizing) dissolved oxygen sensor to measure DO levels in aqueous media, internally self temperature compensating (even without integrated TC element) Environmental monitoring of water quality in rivers, lakes and wells and other natural water sources, compliance for health and safety applications; municipal secondary and tertiary wastewater treatment; industrial wastewater treatment; aquaculture and fish applications 0.0 to 40.0 ppm or 0 to 400% saturation 0.01 ppm anywhere in the range Minimum 10% of full range (4ppm or 40% saturation) for both analog current loop & MODbus. The 4mA & 20mA setpoints can be arbitrarily defined and are fully reversible 0.01 ppm Typically 2 to 12 (Inquire for other ph levels outside of this range) 0 to 50 C (32 to 122 F) Typical installations 10 psig or less; Submersible to 50 meters (165 feet) Continuous flow, Minimum 1cm per second for stable readings Membrane covered galvanic cell generates an internally temperature compensated mv signal linear to dissolved oxygen in air or liquid. ASTI-DO standard sensor response is 2 to 6 mv per ppm; AST-DO-T thick-style membrane response is 0.25 to 2.50 mv per % saturation. 3TX-DO(-T) corrects for temperature, pressure and salinity effects on % saturation in calibration and measurement modes; More details are provided on the following pages Bright 3-digit red LED display visible in sunlight CSA/UL/CE Universal 100 to 240 VAC power supply, consumption 60mA max per module Scalable 4-20 ma; DO ppm, % Saturation & Temperature all sent on optional RS485 MODbus Wall, Pipe or Panel Mounting for 2, 3, 4, 6 or 7 modules per enclosure (NEMA 4X CSA/UL) Transmitter Modules: In addition to dissolved oxygen, modules are available for ph, ORP, mv, Temperature, Conductivity and Ion Selective (ISE) measurements including Fluoride, Ammonia, Nitrite, Nitrate & Calcium among others. All analog outputs have built-in trim calibration support, including both offset and span adjustments. Calibration of temperature element is available for all measurement modules via 1-point offset adjustment. Preamplifier Support: Unlike many low cost systems, the 3TX-pH and 3TX-ISE transmitter series supports optional external preamplifiers for noisy environments or to avoid opening the analyzer enclosure for sensor service, and to minimize sensor replacement costs (no long cables need be pulled). 3TX-REL Option: Alarm and relay controller module provides (2) each 5 Amp contact relays and controller that is fully configurable by the user for control mode and variables for each control algorithm. Control modes include: 1) Alarm functions only; 2) On/Off control with a user-configurable dead band; 3) Time proportional control; and 4) Proportional frequency control (variable pulse controller). 3TX-DAT Data Logging Option: MODbus 3TX-DAT datalogger can support simultaneously datalogging from any 3TX module with MODbus output (3TX-pH, 3TX-ISE, 3TX-DO, 3TX-CON and 3TX-TOT) at frequencies from every second to every hour. Configuration of 3TX-DAT datalogger and downloading of data done via freely supplied mating Windows PC software. 3TX-TOT Option: ph compensation module computes total ammonia (NH3 + NH4 + ) using the free ammonium ion activity, ph, and temperature from the respective measurement modules bridged outputs. The 3TX-TOT module includes a scalable 4-20mA output for total ammonia result and RS485 Modbus communications for all inputs and outputs. By using the bridged output for totalizing, you retain the use of free ion and ph 4-20mA outputs. THE 3TX-TOT IS REQUIRED AT ph ABOVE 7.5 TO PROPERLY PERFORM AMMONIUM ISE MEASUREMENTS AT MOST TEMPERATURES. Modbus Option: Available as RS-485 output option for measurement module or by adding 3TX-TOT module at any time. Free of charge Windows Graphing & Datalogging software supplied with all 3TX modules purchased with MODbus output option or 3TX-TOT. Enclosure Options: NEMA 4X Enclosures (CSA/UL Listed) for 2, 3, 4, 6, or 7 modules for Wall, Panel or Pipe Field Mounting or 35mm Din-Rail Only Power Options: Universal 100 to 240 VAC 50/60 Hz power supply or 3-wire 24VDC operation (not 2-wire loop power) with a dedicated power supply. Last Revised April 27, 2015

3 Automatic Calculation of Theoretical 100% Dissolved Oxygen Saturation at any Temperature & Pressure for Accurate Calibration & Measurement The 3TX-DO(-T) has preprogrammed the correct 100% dissolved oxygen saturation levels valid at any temperature and pressure. This is important for two main purposes: 1) to ensure accurate calibration of the sensor which is performed dry in air and 2) when the percent (%) saturation is displayed and output for purposes of monitoring and control. The graph below demonstrate the impact of both temperature and pressure on the dissolved oxygen (DO) ppm levels that constitute 100% saturation condition. For the calibration function, either the field condition should be 100% relative humidity for best accuracy or else the sensor should be suspended dry in air but over a water source to simulate locally the 100% relative humidity condition. The water molecule in air (humidity) is then saturated with oxygen in manner that can be fully described by the ambient temperature and pressure as shown above. When placed into service, the galvanic DO sensor will measure the ppm levels at the installation depth. To convert this measured ppm value into percent (%) saturation the 3TX-DO transmitter uses the stored curve visualization above.

4 Automatic Calculation of Theoretical 100% Dissolved Oxygen Saturation at any Temperature & Pressure for Accurate Calibration & Measurement The 3TX-DO(-T) has preprogrammed the correct 100% dissolved oxygen saturation levels valid at not only any temperature and pressure but also corrected for salinity. This is important for applications where not only fresh water will be present but also for brackish and salt water sources in variable amounts. The graph below demonstrates the impact of salinity on the dissolved oxygen (DO) ppm levels that constitute 100% saturation condition at the nominal 760mm pressure condition. For simplicity of visualization just one set of curves is shown although the analyzer can perform this compensation any temperature, pressure or salinity. This salinity correction is only required as a correction to the computation of the % saturation from the measured DO ppm levels for the inline measurement. Since the calibration is done dry in air, salinity correction is not required for this part of operation. Since the impact of salinity is considerable as shown in the graph above, it must be corrected carefully at any level of salinity and temperature. The salinity value in standard PSU (PPT) units can be entered into the 3TX-DO transmitter to perform this correction. The value of the salinity can be determined by a handheld salinity meter or else monitoring continuously using a 3TX-CON conductivity transmitter from which one can readily convert into common salinity units.

5 3TX DO 3-Wire Dissolved Oxygen Transmitter 3TX-DO is a transmitter for Dissolved Oxygen (DO) & Temperature Measurement Measurement Ranges: Full Range 0-40ppm (0-400% saturation); Minimum Scaling 0-4ppm (0-40% saturation), 0-50 C, 0.01 ppm resolution anywhere in range Most Galvanic (a.k.a. active self-polarizing) type DO sensors supported that have internal (automatic) temperature compensation of the mv potential per ppm unit Galvanic DO sensors have a true zero unlike polarographic (amperometric) DO sensors; no zero cal required but rather only a simple gain calibration in air Gain calibration is performed with sensor just dry in air; Absolutely NO look-up tables or wet solutions required to calibrate your DO sensor with the 3TX-DO! 3TX-DO has the preprogrammed the correct 100% saturation value for calibration at any temperature, elevation & pressure via automatic or manual gain cal mode % saturation computed with corrections for the temperature, pressure and salinity Display Dissolved Oxygen (DO) in ppm or % saturation units or Temperature in Celsius. Scalable analog output 0-20 or 4-20 ma for DO in ppm or % Saturation RS-485 MODbus Output sends DO ppm, % saturation as well as Temperature Galvanic isolation between sensor input and analog output (3000V rating) FEATURES The ASTI 3TX Family of Transmitters Consists Of: 3TX-pH: ph, ORP/mV and Temperature Transmitter with fully scalable 0/4-20mA output and MODbus (optional) 3TX-CON: Contacting Conductivity Transmitter with fully scalable 0/4-20mA output and MODbus (optional) 3TX-ISE: Ion Selective * Transmitter with fully scalable 0/4-20mA output and MODbus (optional) 3TX-DO: Dissolved Oxygen Transmitter with fully scalable 0/4-20mA output and MODbus (optional) 3TX-TEM: Adds scalable 0/4-20mA output of Temperature to 3TX-pH, 3TX-ISE, 3TX-CON or 3TX-DO transmitter. 3TX-REL: Alarm & relay controller (On/Off, TPC, PFC) for ph/orp, ISE, DO & Conductivity measurement modules 3TX-TOT: Compute ph compensated Total ISE from ISE & ph analog inputs, 0/4-20mA analog & MODbus outputs 3TX-DAT: Datalogger & MODbus Master for up to 63 each 3TX transmitter modules with RS485 MODbus output The 3TX family has a 3 digit display and 6 LEDs for setup and displaying values. The Mode key is used to navigate. Programming The module is programmed by 3 keys on the front panel. The Mode toggles and the Up or Down scroll through parameters. The parameter is altered via the Mode and the value is changed using the Up or Down. Parameter P01 is a lock which must be set to Off to change ANY parameter, including the temperature & gain calibrations. * Ion selective measurement must be validated by ASTI factory prior to order. 3TX-ISE sold only as part of complete ISE system with mating ISE sensor. Input The galvanic sensor for oxygen is connected to terminals 1 and 2. The mv is connected to terminal 1 and the +mv to terminal 2. The internally (self) temperature compensated absolute mv potential is the basis for the display and output(s). The temperature sensor is connected to terminals 4 and 5; the resistance is the basis of the temperature measurement used to set the 100% saturation condition in the gain calibration and to compute the % saturation state in the process. The AST-DO-T thick-style membrane DO sensors must be used with the 3TX-DO-T transmitters; the mv response is linear to the % saturation. Analog Output (Standard) The 3TX-DO & 3TX-DO-T transmitters have a scalable analog output selectable to 0-20 ma or 4-20 ma, that can be standard or inverted. The output scaling between the minimum (0mA or 4mA) and maximum (20mA) output is 10% to 100% of the 0-40 ppm or 0-400% saturation DO full range scale, where low and high outputs can be arbitrarily selected. The output is galvanically isolated from input and proportional to DO ppm or DO % saturation. MODbus (Optional) Data is transferred using MODbus standard for multidrop communication using RS485. The Modbus master may be the 3TX-DAT or any SCADA system. When units are ordered with MODbus, a Windows datalogging software is freely provided. The MODbus option allows for the DO value in ppm and percent (%) saturation units to be sent simultaneously as well as the process temperature.

6 Housing: Mounting: IP Class: Connector: Temp.: Weight: Dimensions: CE mark: IOTRON TM TECHNICAL SPECIFICATIONS Mechanical Lexan UL94V-0 (Upper part) Noryl UL94V-0 (Lower part) M36 for 35 mm DIN rail Housing IP40. Connector IP20 Max 16A. Max 2.5 mm 2 Max torque 0.6 Nm Usage -15 to +50 C (Storage -35 to +75 C) 75 grams (2.64 ounces) D 58 x W 36 x H 86 mm (2.3 X 1.4 X 3.4 ) EN61326A Function and Programming The 21 parameters are shown to the right. For access, please see page 1. If the softwarelock (Par. no. 1) is On the parameters can only be read. Set Software Lock to Off to change values. Par. no. 2 sets module s address for MODbus communication. Par. no. 3 sets temp. to manual (set) or automatic from sensor. Par. no. 4 sets the temp. value when in fixed (set) mode for P03. Par no. 5 sets the ambient barometric air pressure in units of mmhg. This value is used in the gain calibration and for calculating the % DO saturation. Any barometer at (or near) installation site can supply the pressure in these common units. Par. no. 6 is the wire gauge (AWG) for the sensor cable used. Par. no. 7 is the length of sensor cable in units of feet. Par. no. 8 is the salinity of the process sample in units of PSU. Par. no. 9 sets mode used to compute % saturation. The default automatic mode uses DO ppm and computes the % saturation based upon the given temperature, air pressure and salinity. Manual mode uses a fixed DO ppm to define 100% saturation. Par. no. 10 defines the DO ppm that constitues 100% saturation condition when P09 is set to manual mode. Par. no. 11 selects the analog output (and MODbus output mode if present) of the dissolved oxygen (DO) transmitter in units of ppm or % saturation; these units are also used for P14 & P15. Par. no. 12 sets the analog output to either 0-20 ma or 4-20 ma. Par. no. 13 allows setting the output to be inverted (i.e. for use in control) with the output corresponding to 20-0mA or 20-4mA. Par. no. 14 sets 0/4mA output scaling in DO ppm or % sat units. Par. no. 15 sets 20mA output scaling in DO ppm or % sat units. The difference between low & high output setpoints (P14 & P15) must be at least 10% of full range scaling in the chosen units. Par. no. 16 display/adjust gain value. Units are mv per ppm (standard) or mv per % saturation for -T thick style version. Par. no. 17 Offset adjustment for 0/4mA low analog output trim. Par. no. 18 Gain adjustment for 20mA high analog output trim. Par. no. 19 If no keys are pressed for 10 minutes, display will show flasing bar (Energy Save Mode). Pressing any key to exit. Par. no. 20 sets baudrate of 9,600 or 19,200 per MODbus master. Par. no. 21 Feature to reset the analyzer back to factory default. Power Supply: Consumption: Sensor: Measuring Range: Resolution: Galvanic Range: Accuracy: Temp Sensor: Temp Range: DO Temp Comp: Analog Output: PARAMETERS List of Parameters Electrical 24VDC ±10% 60 ma max Self-Polarizing Galvanic DO Sensor 0-40 ppm full range scale 0-400% saturation full range scale 0.01 ppm anywhere in the range mv per ppm Standard or mv per % saturation ( -T ) ±1% Excluding Sensor (Ideal) Pt100 or Pt C ± 0.2 C Automatic in all configurations 0-20mA or 4-20mA, max. 500Ω No Parameter Description Range Default 01 Lock Software Lock On / Off On 02 Address MODbus Node Off, Off 03 Temperature Select Temp Set, Pt100 or Pt100 Input Mode Pt Manual Temp Temp if P03 is Manual Mode 05 Barometric pressure in 600 to Air Presssure mm Hg units 06 Wire Gauge Sensor AWG 20, 22, Cable Length Length in feet feet Salinity PSU Units 0 to % Saturation Computation Automatic Auto Computation % Saturation or Manual 10 Manual ppm for 100% 4.00 to Saturation Saturation ppm 11 Input for lout Input for the analog output DO ppm or % Saturation DO ppm 12 Analog Type of 4-20mA, 4-20 Output Type Output 0-20mA 13 Output mode Inversion noninverted, n.inv Setting inverted 14 0/4mA Low Low Output 0%-90% of 0% Output Scale (DO Units) Full Range 15 20mA High High Output 10%-100% of 100% Output Scale (DO Units) Full Range 16 Working Gain (Slope) Gain/Cal on DO Cell ±50% from Nominal 3.75 or 1.10 (-T) 17 0/4mA Offset Trim Low ±9.99% * mA Gain Trim High ±9.99% * Energy Save Energy Save On / Off On 20 Baudrate MODbus 9,600 / 19,200 19, Back to Default Reset to Default Def=Reset, Par=NoReset * Negative trim adjustments will be shown as flashing numbers. Par

7 Calibration Use the Mode key to select Gain before removing the DO sensor from service. The gain calibration is performed when the sensor is clean and dry and exposed to only air. If the relative humidity is not 100%, the sensor should be suspended in air over a source of water for best results. Sufficient time must be allowed for the temperature and sensor reading to be fully stabilized in this condition to ensure a good gain calibration. IMPORTANT: Be sure to perform a precise temperature calibration before performing any gain calibration. Typical Installation Auto Calibration Routine: To initiate an automatic calibration, simultaneously hold the Up & Down keys for three to five (3-5) seconds continuously and the display will then flash CAL. After eight seconds, the unit will either return a value of Go to indicate success or else a value of Err to indicate a failed calibration. You must press the Mode key to exit the automatic calibrate mode. Manual Calibration Routine: For a manual gain calibration, adjust using Up or Down keys until the display reads exactly 0.0. Positive deviations are shown as X.X or XX. Negative deviations are shown as -X.X or -XX. If a positive value is shown adjust with Down key and if a negative value is shown adjust with Up key. You must press the Mode key to exit the manual calibrate mode. DISPLAY FEATURES & NOTES: The temperature is calibrated with Up or Down buttons in temperature display ( C) mode. The result of gain calibration is viewed and/or modified in P16 (mv per ppm for 3TX-DO & mv per % saturation for 3TX-DO-T). The raw mv is viewed by pressing Down button in ppm or % display mode. The theoretical 100% saturation for the current temperature, pressure & salinity is viewed by pressing the Up button in the ppm or % display mode. DO Sensor Type Full Scale Maximum DO Range (Nominal) Minimum Range at 10% of Maximum Full Range Self-Polarizing Galvanic 0 to 40.0 ppm ( 0-400% ) 0 to 4.00 ppm ( 0-40% ) OUTPUT SCALING NOTES: The 4-20mA scaling can be arbitrarily set provided the difference is at least 10% of the 0-40ppm or 0-400% saturation full range. The mininum difference between the 4mA & 20mA setpoints is then 4ppm or 40% saturation absolute. The analog output is fully reversible. The analog & MODbus outputs can be scaled anywhere between the minimum 10% & 100% maximum limits. The MODbus output scaling will follow the analog setpoints (see more below). MODBUS In order to utilize the MODbus interface the 3TX-DO(-T) must be ordered with MODbus. 3TX-DO(-T) may be used as a slave for the 3TX-DAT or as a slave in a SCADA system or else with the free of charge Windows datalogging and graphing software. With 3TX-DAT If 3TX-DO is used together with 3TX-DAT the baud rate on the MODbus and address of 3TX-DO must be correctly set. The baud rate (P20) must be set to the baud rate of 3TX-DAT. The baud rate used being 19,200 or 9,600 is of no importance, as long as all units on the RS-485 MODbus network are set to the same baud rate. The address (P02) must be unique in the network. In a network with the 3TX-DAT as master, all addresses must be assigned without omitting any address. The exact order is of no importance. In a network with a 3TX-DAT, up to 63 MODbus slaves may be connected, with valid addresses from 1 to 247. In a SCADA system or with Windows software Since different SCADA systems may have different restrictions. The baud rate (P20) must match that of the SCADA system. The address (P02) must be unique in the network. Max of 247 each 3TX units on one MODbus network, with repeaters after 32 units. MODbus Scaling MODbus scaling for DO process measurement is the same as analog output set by P14 & P15. The DO ppm and % saturation are sent via MODbus scaled together with a 10-fold factor, keyed by the units selected in P11. If P11 is DO ppm and scaled as 2-10 ppm, the corresponding % saturation will be %. If P11 is DO % saturation and scaled as %, the corresponding DO ppm will be 5-20 ppm. Temperature is always scaled as C. The 3TX-DO contains 2 measured values (Dissolved Oxygen ppm and temperature) and 1 computed value (% saturation). Access is gained through the function code Read_Input_Registers (04). Read_Input_Registers Function code Start address Number of values , 2 or 3 Value 1 is DO in ppm units, value 2 is the DO in % saturation units and Value 3 is Temperature; all three values are transmitted in sequence; If 3 values are chosen then DO ppm, % saturation and temperature are transmitted. All values are rated to corresponding to the scaled range; the scaled DO ppm range is sent as , the % saturation (always 10 times the DO ppm scaling) as and finally the full scale temperature range (0-100 C) is transmitted as The 3TX-DO gives access to different diagnostic values via Diagnostics (08), as shown in the following. Diagnostics Function Sub Code Description Code (HEX) Return Query Data 0A Clear counters and diagnostics register 0B Return Bus Message Count 0C Return Bus Com Error count 0D Return Exception Error count 0E Return Slave Message count 0F Return Slave No Response count 12 Return Bus Character Overrun count

8 ORDERING INFORMATION FOR 3TX FAMILY OF TRANSMITTERS ENCLOSURE TYPE CODE DESCRIPTION 3TX-0M 3TX Transmitter with No Enclosure 3TX-DIN 3TX Transmitter with No Enclosure; Preinstalled onto 35mm DIN-Rail 3TX-2MW 3TX Transmitter(s) with IP65 WeatherProof Enclosure; Up to 2 Total Modules (Wall Installations Only) 3TX-2M 3TX Transmitter(s) with IP65 WeatherProof Enclosure; Up to 2 Total Modules (Wall or Pipe Installations) 3TX-3MP 3TX Transmitter(s) with NEMA 4X Enclosure for ½-DIN Panel Only; Up to 3 Modules (with Panel Bracket Assembly) 3TX-3MF 3TX Transmitter(s) with NEMA 4X Enclosure; Up to 3 Total Modules (Wall or Pipe Installations) 3TX-4MW 3TX Transmitter(s) with IP65 WeatherProof Enclosure; Up to 4 Total Modules (Wall Installations Only) 3TX-4M 3TX Transmitter(s) with IP65 WeatherProof Enclosure; Up to 4 Total Modules (Wall or Pipe Installations) 3TX-6M *** 3TX Transmitter(s) with IP65 WeatherProof Enclosure; Up to 6 Total Modules (Wall or Pipe Installations) 3TX-7MF *** 3TX Transmitter(s) with NEMA 4X Enclosure; Up to 7 Total Modules (Wall or Pipe Installations) 3TX-9MF *** 3TX Transmitter(s) with NEMA 4X Enclosure; Up to 9 Total Modules (Wall or Pipe Installations) MEASUREMENT MODULES ONE (1) THROUGH SEVEN (7) CODE DESCRIPTION -ph ** ph/orp/mv/temp Measurement Module / Transmitter -CON-CELL/RANGE Contacting Conductivity Measurement Module / Transmitter (CELL Constant & RANGE in ms Defined at Time of Order) -ISE-ION ** Ion Selective (ISE) Measurement Module / Transmitter (Ion Measurement Type ION Must be Defined at Time of Order) * -DO Dissolved Oxygen Measurement Module / Transmitter For Galvanic Type DO sensors OUTPUT OPTIONS FOR MEASUREMENT MODULES (ONE OPTION MUST BE SELECTED FOR EACH MODULE) CODE DESCRIPTION -A Single Fully Scalable Analog 0-20 or 4-20 ma Ouput Only -D Single Fully Scalable Analog 0-20 or 4-20 ma Ouput Only AND RS-485 MODbus Digital Output ADD-ON MODULES FOR MEASUREMENT MODULE ENCLOSURE ASSEMBLIES CODE DESCRIPTION -PS 100 to 240 VAC 50/60 Hz Universal Power Supply Adapter for Line Powered Operation -TEM Scalable Analog 0-20 or 4-20mA Temperature Transmitter for Raw or Spliced Pt100/Pt1000 temperature element -SW On/Off Power Switch (½ Width of power supply module and ¼ width of standard 3TX transmitter) -REL Alarm and Relay Controller Module for 3TX-pH, 3TX-ISE, 3TX-CON and 3TX-DO measurement modules -TOT Compute ph compensated Total ISE from analog inputs for ISE & ph, 0/4-20mA analog & MODbus digital ouputs -DAT Datalogger & MODbusmaster for 3TX Transmitters with RS485 MODbus; Download & Setup via RS232/USB on Windows -TIM Timer for Intermittent Operation with Battery Packs Special Ultralow Power Consumption Style -BAT Universal Uninterruptible Power Supply with 1.4Ah (33W) LiPo Battery; For use with 7MF or 9MF Enclosures Only Contact the factory for specific recommendations & ALL ISE inqueries. Pipe mounting bracket kits supplied separately. For 3MP, 3MF, 6M & 7MF enclosures power supply is not counted as a module for space purposes. Model: 3TX-2M-pH-A-CON-1.0/50-D Description: Dual Channel Transmitter Assy w/ Weatherproof Enclosure (2 Total Modules); 1 each ph Measurement w/ Analog Output; 1 each Contacting Conductivity Measurement w/ Cell Constant 1.0/cm & Full Range 0-50mS/cm (Min Scaling 0-5.0mS/cm); with Analog and Digital MODbus RS-485 Outputs (No AC Power Supply) Model: 3TX-3MP-ISE-F-A-pH-A-TOT-PS Description: Dual Channel Total Fluoride Measurement Transmitter Assembly with NEMA 4X (UL) Enclosure for ½-DIN Panel Mounting Installations (for 3 Total Modules); 1 each ISE Fluoride Ion and 1 each ph Measurement Module with Analog Output Only; 1 each TOT module to compute total fluoride (HF + F - ) with Analog & MODbus Outputs for all free fluoride, total fluoride, ph and temperature; With Universal 11 Power Supply Module Model: 3TX-3MF-DO-T-D-TEM-SW-PS Description: Dissolve Oxygen Transmitter Assembly with NEMA 4X CSA/UL rated Enclosure; Field or Wall Mounting Installations (3 Module Max); 1 each DO-T transmitter for thick membrnae dissolved oxygen sensors; Scalable Analog & MODbus Output for DO ppm, saturation & Temperature; 115/230 Power Supply with On/Off Switch Model: 3TX-4MW-ISE-NH4-A-pH-A-TOT-PS Description: Dual Channel Total Ammonia Measurement Transmitter Assembly; Weatherproof Wall Mount Only Enclosure (4 Modules Max); 1 each ISE Ammonium Ion and 1 each ph Measurement Module with Analog Output Only; 1 each TOT to compute total ammonia (NH3) with Analog & MODbus Outputs; With 115/230 Power Supply Model: 3TX-6M-ISE-NH4-A-pH-A-TOT-ISE-NO2-A-pH-D-DO-D-PS Description: Five Channel Transmitter Assembly with Weatherproof Enclosure (for 6 Total Modules); 1 each ISE Ammonium Ion and 1 each ph Measurement Module with Analog Output Only; 1 each TOT module to compute total ammonia (NH3) with Analog & MODbus Outputs; 1 each ISE Nitrite Ion with Analog Output Only; 1 each ORP Measurement Module and 1 each DO transmitter for galvanic active self-polarizing type sensors both with Scalable Analog & MODbus Outputs; With 115/230 Power Supply Model: 3TX-6M-ISE-X-F-D-REL-pH-X-D-REL-CON-10.0/500-D-DAT-PS Description: Triple Channel Transmitter Assembly with Weatherproof Enclosure (for 6 Total Modules Max); 1 each Preamp Style Fluoride ISE Measurement Module & 1 each Preamp Style ph Measurement Module with Alarm/Relay Controller for both Fluoride ISE & ph; 1 each Contacting Conductivity Measurement with K=10.0/cm & Full Range 0-500mS; Analog & MODbus Outputs for All Measurements; DAT Datalogger/MODbusmaster Module to record all parameters; Universal 115/230 Power Supply Model: 3TX-7MF-ISE-NH4-D-ISE-NO3-D-ISE-NO2-D-pH-D-CON-1.0/50-D-DO-D-DAT Description: Six Channel Measuring Transmitter Assembly Optimized for Low-Power Battery Operation; with NEMA 4X CSA/UL rated Enclosure (7 Module Max); 1 each ISE Ammonium Ion, 1 each ISE Nitrate Ion and 1 each ISE Nitrite Ion Module; 1 each ph module; 1 each Contacting Conductivity K= 1.0/cm & Full Range 0-50mS; 1 each Dissolved Oxygen module; Analog & MODbus Outputs for all Measurements & Temp; DAT Datalogger/MODbusmaster for continuous datalogging of all parameters ** To obtain a 3TX that supports and requires sensors with preamplifiers, order the ph/orp transmitters as ph-x and the ion selective (ISE) transmitters as ISE-X *** For 2 NPT pipe mounting installations, an additional adapter plate must also be ordered for the 6M, 7MF & 9MF enclosures (inquire to factory for details). Last Modified April 27, 2015 Revision 8

9 AST-DO(-T) Submersible Galvanic Dissolved Oxygen Sensor for Low-Maintenance and Low-Cost Measurements The AST-DO(-T) is a membrane covered self-polarizing active style galvanic cell that generates a lowimpedance millivolt electrical signal proportional to the oxygen pressure it senses. The AST-DO probe is very robust, easy to use and proven solution for measurements from industrial, municipal, environmental to aquaculture applications. The AST-DO(-T) dissolved oxygen sensors offer many advantages over competitor s polarographic (amperometric), galvanic and luminescent (a.k.a. optical or fluorescent) offerings including: FIRST AND FOREMOST A SUBSTANTIALLY LOWER TOTAL COST OF OWNERSHIP: o o Commissioning cost for DO systems with AST-DO(-T) sensors & 3TX-DO(-T) transmitters are often less than 1/3 of luminescent (a.k.a. optical or fluorescent) competitor s systems and often less than 1/2 the cost of polarographic & galvanic DO competitor s systems with same core functionality. The residual cost of ownership for AST-DO(-T) sensors is often less than 1/5 that of optical sensors and often less than 1/3 that of competitor s polographic or galvanic cells. Typical clean water use keeps calibration up to 1 year at a time with membrane lasting 3 to 5 years. More dirty applications will need to have membrane replaced still only annually and calibrate very infrequently. Extremely high stability such that calibration is seldom required. The 50 µ thick rugged membrane is easily cleaned although the required frequency for most application is low. If the membrane is damaged, it can be replaced by anyone at very negligible cost in less than 10 minutes from start to finish. Correct measurements with flow as low as 1 cm/s making it suitable for most any common installation type. Based on a galvanic chemical principle superior to that of traditional polarographic DO probes. Since it is a galvanic type DO sensor there is a true zero and so no zero adjustment is ever needed. Built-in integrated temperature compensation inside sensor means that temperature sensor is only required if percent (%) saturation is to be computed and for most accurate sensor calibration dry in air. Low impedance mv signal means that there is no practical limit to cable length. The cable can be extended with any ordinary PVC jacketed multiconductor leads at the installation site (low-noise).

10 AST-DO(-T) Galvanic Dissolved Oxgyen Sensor Specifications Measure Range: 0-4 ppm up to 0-40 ppm (Lowest Limit 0.1ppm) Operating Temperature: 0-50 C (122 F) Installation Style: Submersible to 50 meters (165 feet) or Inline Flow Temperature Element: Standard with Pt100 temperature sensor Material of Construction: Sensor body is Polyoxymethylene (POM) Dimensions: Dia & Length is 58 mm (2.30 inches) without assembly Cable Length: Standard 23 feet (7 meters), Max is 330 feet (100m) Weight: Approximately 1 pound including standard cable Measurement Principle: Galvanic cell, self polarizing (a.k.a. active type) and self temperature compensating (without TC element) Range and Output: Nominal 2-6 mv per ppm (standard membrane) Nominal mv per % Saturation ( -T thick type membrane) Initial Impedance: Approximately 1 Kilohm Flow Requirements, water: Minimum flow dependent on DO and temperature, typically 1 cm/sec, suitable for most submersible use Supplied With: Junction box with cable glands, spare cap fitted with membrane, 50 ml electrolyte, and spare anode. Calibration: Clean and dry in air over water with 3TX-DO(-T) using automatic or manual calibration mode. No look-up tables or calibrating solutions required. Only AST-DO(-T) sensor and 3TX-DO(-T) transmitter needed for simple calibration. No zero calibration is ever required for galvanic DO sensors with true zero. Since galvanic DO sensors generate their own potential, they do not suffer from cable sensitivity issues that many polarographic (amperometric) DO sensors do that are powered by the transmitter resulting in issues such as warm-up time, drift and related problems. AST-DO(-T) dissolved oxygen sensors have very little sensitivity to environmental issues such as wind or electrostatics (in dry climates) as well as readily supporting long cable runs or deep submersion at installations up to 100 meters (330 feet) or more. The cabling can be bridged across ordinary terminal blocks housed inside a simple waterproof J-box assembly if the cable length needs to be extended. The rugged galvanic DO membrane can be wiped with a cloth, a tissue or even with your thumb. Cleaning the membrane is the only routine maintenance. Probes for lower oxygen concentrations (e.g. in wastewater treatment or water monitoring in rivers, lakes, wells and municipal water) rarely if ever need service unless damaged due to the unique thick industrial grade membrane construction. Spare membranes, internal electrolyte filling solution, cathode and anode parts are also available. Standard sensor package contains all parts to operate for a five-year period. Custom configurations and options available.

11 AST-DO(-T) Galvanic Dissolved Oxgyen Sensor Description The AST-DO(-T) oxygen probe is a galvanic oxygen sensor that produces an electrical output proportional to the oxygen present in the medium it is placed in. It consists of an upper part with cathode, anode and cable, and a cap with membrane and electrolyte. The probe can be supplied as an oxygen probe alone or with built-in Pt100 temperature sensor (standard configuration). The AST-DO(-T) sensor is available with submersible NPT option for standpipe installations or else a suitable flow-cell for inline measurements. Dissolved oxygen is either measured in % saturation or mg/l. The ppm units can be used interchangeably with mg/l. Oxygen diffuses through the membrane onto the cathode, where it reacts chemically and then combines with the anode. This chemical process develops an electrical current, which is converted into a millivolt output signal through a built-in internal electronics. The AST-DO has built in temperature compensation for mg/l (ppm) units and the AST-DO-T has built in temperature compensation for % saturation units. The probe is designed for use at temperatures between 0 and 50 C with liquid movement down to approximately 1 cm/sec (measured at 7 mg/l and 13 C) and depths to 100 meters (330 feet). Special order versions of these DO probes for higher temperatures or greater depths are available on request. AST-DO probes do NOT need regular maintenance or service; just keep the membrane reasonably clean. If you can calibrate to the correct value you should not open the probe, even if it has been in use for many years. If the membrane should be damaged membrane replacement will, of course, be necessary. The procedure to renovate the probe is easy and can be performed on-the-spot by anyone, as described later in this manual. Extra membranes are shipped new sensor orders and additional membranes are available as spares. Deposits develop on all surfaces in any biologically active system, and a deposit that builds up on the membrane of an oxygen probe will change the sensitivity of that probe. AST-DO(-T) probes are designed so that deposits have little influence, but for the greatest accuracy you should keep the probe clean, just as it was when you calibrated it. Deposits should be wiped off the membrane with a soft cloth or paper. The cleaning frequency will depend on the accuracy desired, how fast deposits build up and on their exact nature of the build-up itself. An anti-fouling cap is available for situations where access to the probe is difficult or where deposits build-up so heavily and quickly that very frequent cleaning is necessary. Transmitter to interface with AST-DO dissolved oxygen (DO) probe The AST-DO probe is a low impedance millivolt generator. The output dry in air is about 30 mv for the standard type AST-DO membrane and about 90 to 130 mv for the thick-type AST-DO-T membrane. The mv output is internally temperature compensated and linearly proportional to the oxygen concentration in mg/l for the standard membrane and the % saturation for the thick-type membrane. The output impedance is very low (less than 1 KOhm) so noise problems normally do not exist. The inputs from DO sensors are galvanically isolated from each other for multichannel 3TX transmitter assemblies ensuring accurate readings and stability. Similarly, DO sensors must be galvanically isolated from anything else that can have electrical contact with the water that is measured in to prevent the possibility of ground loop problems. The 3TX-DO(-T) dissolved oxygen transmitter fulfills all of these criterions quite well including an outstanding 3000V galvanic isolation between the input and output of each module and a separate circuit and galvanic isolation for each mating sensor. The 3TX-DO(-T) transmitter is optimized, tested and supported for use with the AST-DO(-T) sensors, although in principle most any galvanic dissolved oxygen sensor could be used so long as it has internal temperature compensation. Internal temperature compensation means the mv signal proportional to dissolved oxygen ppm or % saturation does not need any adjustment to account for temperature effects.

12 AST-DO SENSOR INSTALLATION Shown below is a typical wiring scheme of the AST-DO(-T) sensor mating with a 3TX-DO(-T) transmitter. Further details about the 3TX-DO(-T) transmitter are available on the main 3TX webpage. Please refer to the relevant documentation and manuals for further details. Each AST-DO or AST-DO-T probe active signal is connected using ordinary 2-core cable, and it is fitted with 3 meters of cable unless otherwise specified. The oxygen probe without any TC element has a two-core cable. This type of DO sensor without temperature element must be used with the mating 3TX-DO(-T) transmitter running in manual temperature mode {or else with a separate Pt100/Pt1000 temperature connected to the 3TX- DO(-T) transmitter for automatic temperature correction for calibration and % saturation calculations}. The blue lead is the negative (-mv) signal and the brown lead wire is the positive (+mv) signal. If the sensor cable is to be extended, be sure to use a waterproof junction box assembly (inquire to factory for assistance or supply of such an enclosure type). There is practically no limit to cable length that can be supported with the proper installation scheme. The type of extension cable is not critical, but make sure that the cable selected can withstand sunlight and moisture if you run it outdoors. The AST-DO(-T) probe with a built-in Pt100 has a four-lead cable (temperature inputs coming on the Beige and Black leads). The AST-DO(-T) probe is easy to install. It should be placed where there is some movement in the water; approximately 1 cm/sec is enough at 7 mg/l and 13 C. Ensure that the probe cannot strike against the tank wall or similar, and don't mount it directly above diffusers and other equipment that will give false readings. Several forms of mounting device are available for AST-DO(-T) sensors. Inquire to the factory or your local distributor for assistance with your application. For some applications the probe is often fitted with a membrane protector and hung only by its cable. In other application the NPT submersible assembly option is installed so that it is ready for use with an NPT standpipe for guided submersible installations. For typical inline installation schemes a low-flow cell suitable for ¾ NPT process lines is available. DIRECTIONS FOR USE Calibration The calibration procedure below is when the AST-DO(-T) sensor is mated with the 3TX-DO(-T) transmitter. Use the Mode key to select Gain. The gain calibration is performed when the sensor is clean and dry and exposed to only air. In cases of calibrations performed in air where the relative humidity is not 100%, the sensor should be suspended in air over a source of water for best results. It is necessary to wait for temperature and reading equalization (stabilization) before performing a calibration. Any robust long-life probe such as the AST-DO can take up to an hour to respond to a 10 degree temperature change in air, which only takes 10 minutes in water. This must be taken into consideration when deciding when the probe is ready for calibration. Be sure to perform a precise temperature calibration before doing any gain calibration.

13 The 3TX-DO(-T) transmitter defines from the temperature {measured from the integrated temperature sensor or entered for AST-DO(-T) probes without an integral Pt100 element} together with the entered barometric pressure the theoretical 100% saturated DO ppm value to ensure proper calibration without the need for any charts or tables. All you need is your AST-DO(-T) sensor and the 3TX-DO(-T) transmitter will have all other information stored in the software to complete a proper calibration of the probe in air. The gain calibration can be performed in either automatic of manual mode as may be preferred and is described below: Auto Calibration Routine: To initiate an auto-calibration, simultaneously hold the Up & Down keys for three to five (3-5) seconds and the display will flash CAL. After eight seconds, the unit will either return a value of Go to indicate success or a value of Err to indicate a failed calibration. Press the Mode key to exit the automatic calibrate mode. Manual Calibration Routine: For a manual calibration, adjust using Up or Down keys until the display reads exactly 0.0. Positive deviations shown as X.X or XX; negative deviations shown as -X.X or -XX. For positive value adjust with Down key and for negative value adjust with Up key. Press the Mode key to exit the manual calibrate mode. DISPLAY FEATURES & NOTES: The temperature is calibrated with Up or Down buttons in temperature display ( C) mode. Be sure to perform a precise temperature calibration before doing any gain calibration. The result of gain calibration is viewed and/or modified in P16 (mv per ppm for 3TX-DO & mv per % saturation for 3TX-DO-T). The raw mv is viewed by pressing Down button in ppm or % display mode. The ppm for 100% saturation at the current temperature, pressure & salinity is viewed by pressing the Up button in the ppm or % display mode. Calibration Tips: Take the probe up from the water process media, wipe the membrane dry, and hang the probe in free air, away from direct sunlight. If necessary, wrap aluminum foil around the AST-DO sensor to avoid sunlight negatively impacting on the calibration. Be sure to wait for complete temperature equalization before performing the calibration described above. Calibration against various "pocket" test kits cannot be recommended. At high altitudes, or for greater accuracy, a correction must be made for air pressure which can be entered in mmhg units using parameter P05 in the setup menu. The salinity correction is required in salt water or brackish solutions to ensure that the DO measurement (and in particular the computed % saturation) is accurate. The salinity in PSU (same as ppt) units can be entered using parameter P06 also in the setup menu. The salinity can readily be found from a handheld portable conductivity meter that has the proper software to convert the measured conductivity in millisiemens (ms) units into to salinity PSU/PPT units. For AST-DO sensors that have the integrated Pt100 temperature element, be sure that the wire gauge (parameter P07) and the cable length (parameter P08) are also properly entered. How often should calibration be performed? Unfortunately, it is not possible to answer this question. Under ideal conditions (in air) the probe can keep its calibration for many months. In use in water the actual conditions (e.g. the nature of deposit build-up) and the desired accuracy will dictate calibration frequency. It is very important that calibration is performed with care. Give the probe good time to stabilize, check the barometer and decide if correction is necessary. Check the salinity if you measure in salt water. Remember that no measurement is more accurate than the calibration. Maintenance The probe's membrane must be kept free from deposits. A film composed mostly of bacteria will cover ALL surfaces in a biologically active system. This bacteria film acts as a diffusion barrier for the oxygen that must diffuse through the membrane. The membrane must, therefore, be cleaned at regular intervals, the frequency depending on the actual conditions. Cleaning can be performed with a cloth or soft paper. The membrane is strong and not easily damaged, but do not try to scratch it clean with a fingernail! There is no need to exchange the electrolyte regularly, and there is no sensor element that will need replacing! The probe should not be taken apart unless the membrane is damaged or you cannot calibrate to the correct value after long use.

14 Other Points Worth Considering Even though the AST-DO probe is one of the most robust available, it should be treated carefully. It measures of few thousandths of a gram of oxygen, which it must "drag" out of the water around it. So, if, in your opinion, it performs mysteriously, ask the ASTI factory or your local agent/distributor for assistance. SERVICE PROCEDURE FOR DO PROBES DO Probe membrane replacement and probe renovation The probe's membrane should be wiped clean from time to time. The probe should not be taken apart unless the membrane is damaged or unless, after long use (i.e. years), you cannot calibrate to the correct value. Please note the following points: The electrolyte (filling solution) of an AST-DO probe is blue to start with, but soon becomes very dark, and deposits are found inside the probe. To replace the membrane and renovate the probe proceed as follows: 1) Remove the probe, rinse it and unscrew the cap. If it sticks, tap the side of the probe gently with a hammer then try again. Discard the very dark used electrolyte, rinse the cap and top part, clean off any dark colored oxide deposits. 2) Inspect the anode. If the probe was filled correctly when it was last renovated it will be easy to clean the dark deposits from the anode using a nailbrush or similar. If the probe was not filled completely the anode will be very corroded and must be replaced entriely. Check that the nut under the anode is tight before fitting a new anode. Wash the anode in soapy water before use to remove any protective oil. 3) Check the cathode and remove any deposits using the plastic abrasive pad supplied with the probe or a little wet or dry emery paper, grade 600. The cathode MUST NOT BE POLISHED.

15 4) Rinse and dry the top part. 5) You can at this stage perform an easy check on the probe. Dry the probe completely taking care especially at the cathode and area around it. You can then observe the output signal of the probe and it should be zero (less than 0.01 mv when measured at the probe). Contact your distributor if this is not the case. 6) Fill a NEW OR RENOVATED CAP to the brim with electrolyte. The use of excess electrolyte helps to remove any entrenched air bubbles. Locate the flat machined from the thread. Lower the upper part into the cap and turn the cap half a turn to engage the thread. Tilt the probe 15 so that the flat is uppermost and screw the cap onto the top part. Excess electrolyte and air should dribble out at the flat. IT IS IMPORTANT THAT THE PROBE IS FILLED COMPLETELY. WHEN YOU ARE CERTAIN THAT THE PROBE IS FILLED COMPLETELY TIGHTEN THE CAP HARD. After renovation the probe can be regarded as new. It should be hung up in air to stabilize for at least an hour before calibration. If possible re-calibrate after a day or two for best results. A new membrane can easily be fitted to the cap as described on the following page. A cap must not be re-used without replacing the membrane, as the membrane stretches to fit the cathode, and will not fit perfectly a second time

16 The four step procedure for fitting a new membrane to the cap is as shown below. The membrane must be completely flat. If any wrinkles are present remove it and try again with a new one. It is important that all parts are clean and dry. Neither O-ring nor membrane can be used more than once. Spare Parts Spare membranes, O-rings and electrolyte for the first few years' use are shipped with the probe, after which you can purchase more. A stock of these parts will enable you to replace a damaged membrane in a few minutes. If desired you can also stock a spare probe in which case you will then be able to replace a probe that is accidentally mechanically destroyed, damaged or lost. A spare probe can be kept ready-to-use for years at a time if stored in the proper manner and conditions. Spare probes should be stored in a cool, dry place without any electrolyte (filling solution) in the cap (completely dry). When a dry, unfilled spare probe is taken from stock for use, follow the steps outlined on the previous pages to get it ready for installation. A stock of one or more spare caps will make it easy to renovate probes with damaged or old membranes. You can fit new membranes to the old caps indoors in the dry conditions ready for next time. You can also keep one or more spare anodes that must be washed in soapy water to remove all protective oil before use. Spare Part Numbers & Optional Installation Fittings DO-MPPM : Sets of 25 membranes with small O-rings DO-THICK: Set of 10 each thick-type membrane with small O-rings DO-AN3 : Anode for AST-DO probes. DO-C3PPM : Cap with AST-DO membrane. DO-PP : Membrane protector. DO-E30500 : 500ml Electrolyte (Internal Filling Solution). DO-E31L : 1000mL Electrolyte (Internal Filling Solution). DO-INLINE: Inline Low-Flow Cell Adapter AST-DO sensors for ¾ Process Lines DO-TOOL : Membrane ring removal tool. Last Revised April 27, 2015

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