SDI mA Pressure Transducer (Submersible + Dry) Model WL2100 Operating Manual

Transcription

1 SDI mA Pressure Transducer (Submersible + Dry) Model WL2100 Operating Manual (Submersible) WL2100W (Dry) WL2100D QUALITY SYSTEM ISO: 9001 CERTIFIED HYQUEST SOLUTIONS PTY LTD Scrivener St, Warwick Farm, NSW 2170, AUSTRALIA Phone: Fax: sales@hyquestsolutions.com.au Web: Copyright WL Issue 2.0: 24 Mar, 2016

2 WL2100 SDI mA Pressure Transducer The HyQuest Solutions WL2100 is our latest generation of wet/dry pressure transducers. It allows the measurement of water head to a fine degree of accuracy and repeatability, due to full temperature compensation, and interfaces via SDI-12 or 4-20mA. The Submersible (Wet) transducer consists of a strain gauge bridge sensing element fitted to a housing. The strain gauge bridge is type 316 Stainless Steel and the house is a combination of Nickel plated brass and delrin. The electronic components are factory sealed within the housing. The electrical connection is made via a multicore vented submarine cable. The Dry transducer also consists of a strain gauge bridge sensing element fitted inside a power coated die-cast enclosure. The electrical connection is made via a multicore cable. Specifications : Isolation Diaphram : Operating Range : Overpressure : 316 Stainless Steel (WL2100W only) 100kPa (10 metres), 200kPa (20m), 300kPa (30m) 1.5 x Range Supply Voltage : 9V 30VDC (beyond SDI-12 specification Version 1.2). Supply Current : 2.0mA nominal in SDI-12 mode Output Signal : SDI-12 Compliant (Version 1.2) OR 4-20mA (The user selects) Overall Accuracy : Long term stability : Measurement Cycle : Recommended Warm Up Time : Operating Temperature range : Humidity : Electrical Connection : Vented Cable (WL2100W only) : Voltage Spike Protection : Calibration : Insulation : Dimensions : Mass : % F.S. BSL Typically % FS/annum Every 4 secs (in 4-20mA mode) When requested (in SDI-12 mode) 15 secs (after power is first applied) -20C to +60C (Compensated over this range) 100% (WL2100W) WL2100D 3wires : WL2100W Junction Box +12V Power (red) SDI-12 Data (white) 0V Gnd (black) 6 core vented polyurethane with kevlar strength members. (Up to 60m due to SDI-12 specification). Will withstand a 600V voltage spike in accordance with ENV50142 without damage when applied between excitation lines and case. Over full pressure range. Greater than 100Mohm at 500V d.c. WL2100W : Length 180mm : Diameter 37mm WL2100D : 150mm x 60mm x 35mm (L x W x H) 0.39 kg (WL2100W excluding cable) 0.45 kg (WL2100D including cable) Copyright WL Issue 2.0: 24 Mar, 2016

3 Connection as a 4-20mA Transducer **Note that the WL2100 is supplied set to the 4-20mA mode as default. Data Logger Switched Power +12V (red) Data (Not Used) 0V (black) 4-20mA Earth (green) Junction Box / Vent : +12V, Data, 0V, Earth Sense NOTE : Set Logger for a 15 sec warm-up) + 12V - Factory Default Setting : 4-20mA Mode is On ( Set via SDI-12 parameter X14 0X14+1! ) Basic Configuration of a WL2100W in 4-20mA mode Bubbler Data Logger Switched Power +12V (red) Data (Not Used) 0V (black) 4-20mA Factory Default Setting : 4-20mA Mode is On ( Set via SDI-12 parameter X14 0X14+1! ) Sense NOTE : Set Logger for a 15 sec warm-up) + 12V - Basic Configuration of a WL2100D in 4-20mA mode Copyright WL Issue 2.0: 24 Mar, 2016

4 Connection as an SDI-12 Transducer **Note that the WL2100 is supplied set to the 4-20mA mode as default. Therefore to operate in SDI- 12 mode with minimal power consumption, the X14 parameter must be set to 0. That is 0X14+0! Data Logger +12V (red) SDI-12 Data (white) Earth (green) Junction Box / Vent : +12V, Data, 0V, Earth 0V (black) 4-20mA Mode must be set to off ( Set via SDI-12 parameter X14 0X14+0! ) Basic Configuration of a WL2100W in SDI-12 mode Bubbler Data Logger +12V (red) SDI-12 Data (white) 0V (black) 4-20mA Mode must be set to off ( Set via SDI-12 parameter X14 0X14+0! ) Basic Configuration of a WL2100D in SDI-12 mode Copyright WL Issue 2.0: 24 Mar, 2016

5 4-20mA Mode and SDI-12 Mode 4-20mA Mode The transducers are supplied from the factory set to 4-20mA mode. That is, as the water depth varies between 0.000m and the maximum range, the current drawn will vary between 4.000mA and mA. So you may immediately use the transducer in 4-20mA mode without any configuration! Note that in 4-20mA mode, a measurement is taken every 4 seconds and the 4-20 output is automatically updated. The Logger should be set for a 15 sec warm-up, if the transducer power is switched on for a measurement. If you desire better resolution on the 4-20mA output, you can set the 4mA water level and the 20mA water level without affecting the calibration. As mentioned, it is preset at the factory so that the 4mA water level is 0.000m and the 20mA water level is set to the maximum transducer range (say m). Using the SDI-12 interface you can program a new 4mA water level with the X2 command and a new 20mA water level with the X3 command. (This can be done using the SDI-12 to RS232 interface, and a PC using HyperTerm. See Appendix A.) SDI-12 Mode The transducer when set to 4-20mA mode, will still operate using an SDI-12 interface, however it will draw 4-20mA of current. This is not desirable, so a special mode has been implemented that disables the 4-20mA of current draw, and the transducer will only draw about 2mA. This is more acceptable for an SDI-12 transducer. Simply set the extended command X14 to 0 by using the command 0X14+0! In this mode the transducer will only take a measurement when requested with an SDI-12 M command. Water Depth Calculation The WL2100 SDI-12 / 4-20mA Transducers calculate the water depth by measuring pressure. The formula used is as follows : Water Depth = ( Measured Pressure x User Factor ) + Offset (in metres) (kpa) ( m/kPa) (m) Copyright WL Issue 2.0: 24 Mar, 2016

6 SDI-12 / RS232 SELECTION The SDI-12 protocol has very strict timing requirements. The operator may use the SDI-12 to RS232 adaptor cable and then communicate using RS232 from a PC. This special mode is enacted on each command by proceeding each SDI-12 command with an ascii * rather than a break. When the ascii * is detected, all of the timing/break requirements of the SDI-12 are removed. Commands may be typed from a terminal program such as Hyperterm. Note you must use 1200 baud, 7 bits, even parity and no handshaking. The a in the following command description is the transducer address. SDI-12 V1.2 COMPLIANT COMMAND SET Name Command Response Break Continuous None spacing for at least 12 milliseconds Acknowledge Active a! a<cr><lf> Send Identification ai! allccccccccmmmmmmvvvxxx...xx<cr><lf> (Refer Note 1.) Change Address aab! b<cr><lf> Address Query?! a<cr><lf> Start Measurement am! atttn<cr><lf> n measurements available in ttt seconds Send Data 0 ad0! (Response from Measurement and Concurrent commands) (Refer Note 4) a<value1><value2><value3><value4><cr><lf> value1 = pressure in kpa value2 = pressure in psi value3 = water level in meters value4 = water level in feet Send Data 1 ad1! (Response from Measurement and Concurrent commands) a<value1> = temperature in o C Start Verification av! atttn<cr><lf> (Refer Note 2) Start Concurrent Measurement ac! atttnn<cr><lf> Copyright WL Issue 2.0: 24 Mar, 2016

7 Note 1. a12hydrservwl <cr><lf> digit Sensor ID (eg 12345)(as set in ax4 command) S/W Revision (eg 1.0) Model (WL2100) Company ID (HydrServ) SDI-12 Version V1.2 Compliant Unit Address Note 2. The measurement command M and the concurrent command C will both return a time ttt of 002 indicating that the measurement will be ready in 2 seconds. Do not request data within this 2 second window, or an empty reply will be received. (In accordance with the SDI-12 protocol.) When an M command is in progress, the wet transducer will issue a service request a<cr><lf> when the measurement is complete and ready for a data request. (Again, in accordance with the SDI-12 protocol) Note 3. av!initiate Verify Command The Wet Transducer returns a0001<cr><lf> indicating that there is 1 measurement available and it will be ready in 0 seconds. When the Data command ad0! is issued the wet transducer will reply with : a+0<cr><lf> Internal address of A-D converter (0 to 7) Note 4. When X11 is set to 0, all forms of the measurement are returned a + +xxx.xxxx +yyyy.yyy +zzzz.zzz <CR><LF> When X11 is set to 3, only the water level in m is returned a +yyyy.yyy <CR><LF> Where : Pressure in kpa xxx.xxxx Pressure in psi yyyy.yyy Water Level in m zzzz.zzz Water Level in ft See the X11 command for other options. Copyright WL Issue 2.0: 24 Mar, 2016

8 SPECIAL COMMANDS The a in the following commands is the transducer address!!! axn! Return data associated with command n. The transducer will reply with a0001<cr><lf> The ado! command must be issued to get the actual data. axn+xxxx! Set parameter for command n. The transducer will reply with a0001<cr><lf> The ado! command must be issued to get the actual data. Set/Get Current Water Level Value in metres ax0! Get the water level in metres (from last measurement). ax ! Set the water level to m. (This calculates and saves an offset that is added to the water level) (See the ax9! command for viewing and clearing the offset) Get the Transducer Pressure ax1! Get the transducer pressure in kpa (from the last measurement). eg kpa Get/Set the 4mA Level ax2! Get the 4mA Level. ax ! Sets the 4mA Level to 2.5m When the water level is 2.5m then the 4-20mA loop will pass 4mA Get/Set the 20mA Level ax3! Get the 20mA Level. ax ! Sets the 20mA Level to 20.0m When the water level is 20.0m then the 4-20mA loop will pass 20mA Set/Get ID Number ax4! Get the transducer ID. ax ! Set the trasnducer ID. Acceptable values This value appears in the Identify command. Get the 4-20mA Output Hex Data ax5! Get the hex data that determines the 4-20mA output. (Data reply does not strictly conform to SDI-12 format eg. 0+07AC4 <CR><LF>) Copyright WL Issue 2.0: 24 Mar, 2016

9 Set/Get the User Factor ax7! ax ! Get the User Factor. Set the User Factor to m/kpa Clear/Get the Water Level Offset ax9! ax ! Get the present Water Level offset in metres only! Clear the Water Level Offset to (OK for metres or feet) (Only the value is accepted) Set/Get Current Water Level Value in feet ax10! ax ! Get the water level in feet (from last measurement). Set the water level to ft (This calculates and saves an offset that is added to the water level) (See the ax9! command for viewing and clearing the offset) Set/Get Format of Measure Command Data ax11! ax11+3! Get the Format of the Measure Command Data. 0 => kpa + psi + m + ft 1 => kpa only 2 => psi only 3 => m only 4 => ft only Set the Measure Command to return 1 Data value in metres Set/Get the Temperature ax12! Get the Temperature ( o C) inside the transducer. (Can also be obtained using ad1! after a measure is performed) ax ! Set the Temperature to 23.5 o C. This is used to calibrate the temperature sensor. It is calibrated at the factory and so this command should be used with caution! Set/Get the 4-20mA mode ax14! ax14+0! Get the 4-20mA mode eg. 0=> 4-20mA is off : 1=> 4-20mA is on Set the 4-20mA mode to off (The factory default is 1 on) The user must set this parameter to 0 if transducer is used in SDI- 12 mode and must set it to 1 if transducer is used in 4-20mA mode. Get/Set the kpa Range of this Transducer *** DO NOT USE THIS COMMAND *** ax80! ax ! Get the kpa Range of this transducer element. (eg kpa) Set the range of this transducer element to 200kPa This parameter is set at the factory, and is dependant upon the pressure element used DO NOT change this value. Copyright WL Issue 2.0: 24 Mar, 2016

10 Get the Raw A-D Hex Data ax90! Get the raw A-D hex value from the last measurement (eg. Raw A-D value +00F7) Adjust the 4mA output to be exactly 4.000mA ax96+00! Output 4mA for 60 Secs, and save the calibration point. ax96+02! Output 4mA for 60 Secs, and increment the calibration point by 02. This command is repeatedly sent to adjust the 4mA calibration point. This is calibrated at the factory - mentioned here for completeness. (After this command is sent, the SDI-12 data line must be disconnected so that the 4mA can be accurately measured.) Adjust the 20mA output to be exactly mA ax97+00! Output 20mA for 60 Secs, and save the calibration point. ax97+02! Output 20mA for 60 Secs, and increment the calibration point by 02. This command is repeatedly sent to adjust the 20mA calibration point. This is calibrated at the factory - mentioned here for completeness. (After this command is sent, the SDI-12 data line must be disconnected so that the 20mA can be accurately measured.) Output the Calibration Table axcal! Dump the calibration table (This command is not SDI-12 compatible) Command used at the factory - described here for completeness. Output the Temperature Table axtmp! Dump the temperature table (This command is not SDI-12 compatible) Command used at the factory - included here for completeness. Copyright WL Issue 2.0: 24 Mar, 2016

11 ***NOTE*** THE FOLLOWING COMMANDS WILL DESTROY THE FACTORY CALIBRATION. THE COMMANDS ARE DESCRIBED HERE FOR COMPLETENESS. Set 0% Pressure *** DO NOT USE THIS COMMAND *** ax98+1! Set the 0% calibration at this specific temperature (-20, -10,..60C) ax98+9! Set the 0% calibration for all temperatures (no temp compensation) (Perform a measure am! before setting the 0% pressure) This is calibrated at the factory - described here for completeness. Set 25% Pressure *** DO NOT USE THIS COMMAND *** ax93+1! Set the 25% calibration at this specific temperature (-20, -10,..60C) ax93+9! Set the 25% calibration for all temperatures (no temp compensation) (Perform a measure am! before setting the 25% pressure) This is calibrated at the factory - described here for completeness. Set 50% Pressure *** DO NOT USE THIS COMMAND *** ax94+1! Set the 50% calibration at this specific temperature (-20, -10,..60C) ax94+9! Set the 50% calibration for all temperatures (no temp compensation) (Perform a measure am! before setting the 50% pressure) This is calibrated at the factory - described here for completeness. Set 75% Pressure *** DO NOT USE THIS COMMAND *** ax95+1! Set the 75% calibration at this specific temperature (-20, -10,..60C) ax95+9! Set the 75% calibration for all temperatures (no temp compensation) (Perform a measure am! before setting the 75% pressure) This is calibrated at the factory - described here for completeness. Set 100% Pressure *** DO NOT USE THIS COMMAND *** ax99+1! Set the 100% calibration at this specific temperature (-20, -10,..60C) ax99+9! Set the 100% calibration for all temperatures (no temp compensation) (Perform a measure am! before setting the 100% pressure) This is calibrated at the factory - described here for completeness. Zero Calibration Table *** DO NOT USE THIS COMMAND *** ax91+1! Offset the whole calibration table, so the present measurement is 0% (Perform a measure am! before zeroing) This is performed at the factory - described here for completeness. Linearise Calibration Table *** DO NOT USE THIS COMMAND *** ax92+1! Adjusts the 25%, 50% and 75% calibration table, so it is linear. This will destroy the complete temperature compensation! This is performed at the factory - described here for completeness. Copyright WL Issue 2.0: 24 Mar, 2016

12 Sample Communication Session Assumptions : - Using the SDI-12 to RS232 converter (shown in Appendix A) - Using a PC running HyperTerm - Comms set to 1200 baud, 7 bits, even parity, no handshake. - Address of transducer is the factory default 0 *?! 0 User types *?! and Transducer responds with 0 as the address *0I! 012HydrServWL *0X14+0! User types *0I! and Transducer responds with 012Hydr.. User types *0X14+0! to set for SDI-12 mode Transducer responds with *0M! User types *0M! to request a measurement and Transducer responds with immediately (5 data values ready in 4 secs) 0 After 4 secs transducer responds with 0 => complete *0D0! User types *0D0! to request Data 0 reply Transducer replies with pressure in kpa and psi, as well as water level in m and ft. (You can set parameter X11 to 3 so it just responds with water level in metres!) *0D1! User types *0D1! to request Data 1 reply Transducer replies with temperature in o C *0A1! 1 Change transducer address from 0 to 1 (Only change the address if multiple SDI-12 sensors are used on a single logger) Copyright WL Issue 2.0: 24 Mar, 2016

13 Appendix A The following schematic is for an SDI-12 to RS232 adapter that can be used for any HyQuest Solutions SDI-12 transducer. The adapter will allow a transducer to be connected to a PC, and will communicate at 1200 Baud, 7 bits and even parity. To bypass the strict timing requirements of SDI-12, simply proceed each command with an ascii * (rather than the break implemented by SDI-12). Copyright WL Issue 2.0: 24 Mar, 2016