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Digiquartz® Programming and Operations Manual

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2. MET3 Solar Shield and Barometer Port Replacement The solar shield and barometer port assembly should be replaced in its original orientation The base of the shield port assembly has a gasket seal between it and the electronics enclosure to prevent any moisture from entering the electronics Be sure that the gasket is in good condition and properly seated when replacing the port Hand torque the cap screws to 25 in lbs This torque will compress the gasket approximately 50 percent over tightening may distort the gasket or strip the threads within the electronics enclosure MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 15 MET3A Maintenance Procedures Periodic cleaning of the housing barometer port inlet and temperature humidity sensor is the only recommended physical maintenance of the unit Barometer Port Removal The cleaning procedure consists of unscrewing the barometer port in a counterclockwise direction cleaning out any debris from between the upper and lower plates and the adjacent orifice plates and checking for unobstructed flow through the port assembly If flow is still obstructed the upper plate and upper orifice plate may be removed by unscrewing the Y2 20UNF flat head socket screw on top of the port Use a 5 16 Allen hex wrench This allows access to both the orifice plates and the interior of the upper end of the column Remove any debris from the various orifices and reassemble applying a small am
3. SUPPLEMENTAL INFORMATION 14 4 26 PIN BENDIX MS CONNECTOR Models Model PS 2 Water Level Sensor 16 bit parallel output Pin outs PINA CHASSIS GROUND PINB DATA FROM COMPUTER PINC DATA TO COMPUTER PIND INHIBIT TRIGGER PINE D7 PINF D3 PING SIGNAL AND POWER GROUND PINH D9 PINJ DIO PINK D12 PINL DISPLAY CLOCK PINM D14 PINN DIS PINP DO PINR D4 PINS DS PINT D6 PINU DISPLAY DATA PINV D2 PINW DI PINX DO PINY DII PINZ D13 PINa DATA VALID PINb POWER SEE SCD PINd not used Connector Diagram CONNECTOR PART NO MS3102A28 12P MATING CONNECTOR MS3106A28 12S SUPPLEMENTAL INFORMATION 14 5 DEPTH SENSORS Model 8B 8DP 8WD with RS 232 interface Pin outs PIN 1 DATA TO COMPUTER PIN 2 DATA FROM COMPUTER PIN 3 SIGNAL AND POWER GROUND PIN 4 POWER SEE SCD Connector diagram 77 PIN PIN 7 PINA PIN 3 CONNECTOR PART NO XSG 4 BCL MATING CONNECTOR XSG 4 CCP SUPPLEMENTAL INFORMATION 14 6 DEPTH SENSORS Model 8DP with Intelligent Card Pin outs PIN 1 DATA TO COMPUTER PIN 2 DATA FROM COMPUTER PIN 3 SIGNAL AND POWER GROUND PIN 4 POWER SEE SCD Connector Diagram PIN CONNECTOR PART NO XSE 4 BCR MATING CONNECTOR XSE 4 CCP SUPPLEMENTAL INFORMATION 14 7 APPENDIX C PROGRAMMING HINTS Sometimes it is difficult to be sure exactly what your computer is sending out One trick is to disconnect the transmitter and replace it with a connector which wraps
4. 50 to 60 C and adjusting the MET3A temperature coefficients to correct for combined temperature sensor and electronics nonlinearity This process yields system temperature measurement accuracies of 0 1 C or better over the temperature range of 50 to 60 C Relative Humidity Sensor The humidity sensor uses a polymer capacitance element It was selected for its accuracy stability and resistance to contamination Its output is corrected for temperature effects over a wide temperature range MET3 Only The time constant of the RH sensor in slowly moving air is approximately 5 minutes longer for high humidity Very large steps in humidity can require considerably longer for full equilibrium A step change of 75 RH settles within 5 of final value in 10 minutes and within 1 of final value in 2 5 hours In addition there can be hysteresis effects of a few percent after prolonged exposure to humidity above 90 RH Exposure of the humidity sensor to condensing conditions can lead to humidity readings in excess of 100 however the probe will recover after several hours return to reduced humidity atmospheric conditions MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 20 MET3A Only The recovery time of the aspirated RH sensor is typically less than 2 minutes Very large steps in humidity can take longer to reach full equilibrium A step change of 75 RH settles within 5 of final value in 2 minutes and within 1 of final v
5. b Effective Time Interval is the recommended maximum time interval between measurements that ensures sampling up to the specified cutoff frequency The time interval is set using the PI command Period Resolution is the resolution of pressure and temperature period measurements Measurand Resolution is the resolution of pressure and temperature measurements Pressure and Temperature Digits is the total number of digits used to report pressure and temperature measurements Pressure and temperature period measurements contain one additional digit NANO RESOLUTION FEATURES amp FUNCTIONS 8 3 DEFAULT NUMERIC FORMAT FOR IIR FILTER The default numeric formats used to report period pressure and temperature measurement values are as follows where N the number of significant digits shown in the resolution tables PRESSURE The sensor full scale pressure defines the number of digits reserved for the integer portion of the pressure value For example a 1000 psi full scale unit would have 4 digits reserved but not necessarily used for the integer portion of the pressure value leaving N 4 digits for the fractional portion TEMPERATURE Three digits are reserved but not necessarily used for the integer portion of the temperature value leaving N 3 digits for the fractional portion Negative temperature values include a sign but the numeric format is otherwise unaffected PRESSURE PERIOD Two digits are used for the integ
6. 0001MD 0 What mode No background tasks TYPICAL COMMAND 0100EW 0100MD 1 Turn on display TYPICAL REPLY 0001MD 1 COMMAND DESCRIPTIONS Display active 6 10 POWER MANAGEMENT COMMANDS Digiquartz Intelligent devices can be commanded to enter a low power sleep mode during periods of serial port inactivity The unit awakens 0 6 seconds after a single serial character is received on either port Since the unit is asleep when the wake up character is received that character will be lost and will not be interpreted as being part of a command It is therefore necessary to send a character and wait at least 0 6 seconds before sending a command to an intelligent device that is asleep CAUTION Power management features are not available if MD is set for continuous pressure data output or display data output SL Set or read the sleep mode enable state ACTION Allows sleep mode to be enabled or disabled When sleep mode is enabled the device will enter sleep mode when both serial ports have received no characters for the number of seconds specified by the value of ST When sleep mode is disabled the device cannot enter sleep mode RANGE 0 sleep mode disabled 1 sleep mode enabled DEFAULT 0 TYPICAL COMMAND 0100EW 0100SL 1 TYPICAL RESPONSE 0001SL 1 TYPICAL COMMAND 0100SL TYPICAL RESPONSE 0001SL 1 NOTE If MD is set for continuous pressure data output or display dat
7. 144 0000 Define units TYPICAL REPLY 0001UF 144 0000 Ib tt2 Pressure to Depth Conversions 1 psi m of H O 0 7030696 d 1 cm of HO 70 30696 d 1 in of H2O 27 67991 d 1 ft of HO 2 306659 d 1 m of sea water 0 683853 d 1 0281 ft of sea water 2 243613 d 1 0281 m of air 600 9143 d 0 00117 in of air 23658 04 d 0 00117 COMMAND DESCRIPTIONS 6 9 MD Read or set the mode parameter MD ACTION This parameter controls the power up state of the transmitter The transmitter always responds to user commands but it can also drive a remote display and send data continuously on the RS 232 bus in a background mode These background tasks are turned on and off by the MD command Display MD 0 off MD 1 on MD 2 off MD 3 on Continuous RS 232 off off on on Whenever the transmitter calculates pressure in response to a user request the data are also sent to any active background tasks In addition whenever the transmitter is not servicing user requests it measures pressure and sends it to any active background tasks Background tasks are temporarily interrupted whenever the higher priority computer requests require attention Users requiring maximum sample speed or minimum current drain should turn off any unnecessary background tasks Model 760 portable pressure standard resets to MD 1 when power is applied Other models do not TYPICAL COMMAND 0100MD TYPICAL REPLY
8. humidity system to access the sensor Locate the two hex head screws found just below the upper screen and remove using a 3 32 Allen hex wrench Carefully slide the outer housing down You may encounter a small amount of resistance while removing this housing due to the O ring seals Do not force the housing off the assembly Once removed you will see the temperature RH sensor mounted within the isothermal block Clean the sensor screen with distilled water Sensors which have become heavily contaminated may be scrubbed off with a nylon brush and distilled water Inspect or replace and lubricate the O rings with any silicone based O ring lubricant Carefully re assemble the outer housing MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 17 Aspiration Fan Replacement The internal fan used to provide airflow for the temperature and humidity probe is a highly reliable weather hardened device requiring little or no maintenance In the unlikely event of a failure do not replace it with a standard fan assembly It is recommended that you contact Paroscientific to obtain all the appropriate replacement parts and instructions for performing this procedure MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 18 CALIBRATION OF MET3 MET3A SENSORS Pressure Sensor The MET3A uses a Digiquartz Barometric Standard that offers 0 08 hPa accuracy and a 3 year stability warranty of better than 0 1 hPa per year Pressure Calibration
9. 4 HOW TO GET STARTED This section concentrates on items a first time user needs to know Hook up the transmitter as described in Appendices A and B Then read through Sections 1 and 2 to get an overview of the capabilities of the transmitter Download the latest Digiquartz Interactive software DQI from www paroscientific com Once download is complete run executable and follow on screen instructions to install on a Windows PC must be equipped with at least one RS 232 serial port Download and install the Digiquartz Assistant program to log data from the instrument Context sensitive help is also available while running each program There are a variety of other useful programs that may be found on the Paroscientific website You may also use a standard terminal emulation program to interact with your instrument If trouble is encountered check the programming hints in Appendix C of this manual INSTALLATION Digiquartz Intelligent Transmitters can generally be mounted in any orientation Mounting hole patterns for units so equipped can be found on the Specification Control Drawing SCD supplied with the unit CAUTION Pressure head effects vary with transducer orientation and result in zero offsets These effects are more pronounced when liquid filled pressure lines are being used These effects can be minimized by keeping the transducer pressure port and the pressure source at the same elevation or by making an o
10. Digiquartz MET3 and MET3A Compatible GPS Receivers Thales Navigation Ashtech Javad Navigation Systems Novatel Trimble Leica MET3 3A Data Cable amp Power Adapter Kit The MET3 3A Data Cable amp Power Adapter Kit is an optional accessory provided to integrate a MET station with a data acquisition system such as a GPS receiver PC or a data logger This kit includes a data cable a power adapter and power break out All these items are needed when connecting a MET station to a data acquisition system Paroscientific recommends the data cable and power adapter kit for diagnostics purposes The power adapter and power breakout are used to provide power to a MET station on pin 9 Some GPS receivers such as Thales may provide power to MET stations In this case you don t have to use the power adapter and the breakout to power up the MET station For instructions on connecting your GPS receiver see the website http www paroscientific com under the manuals menu option MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 6 COMMANDS MET3 MET3A Command Descriptions The MET3 MET3A intelligent interface supports a variety of commands that may be used to configure the unit and retrieve data With the exception of the EW command the following commands are unique to the MET3 MET3A Refer to Appendix H for other valid commands These commands supplement the commands listed in the Programming and Operations Manual for othe
11. 0001XM 1 Typical read command 0100XM Typical read response 0001XM 1 CONFIGURING IIR FILTER MODE SETTING RESOLUTION Resolution is a function of the cutoff frequency when operating in IIR mode The cutoff frequency is user selectable and is set by the IA command IA Set or read the cutoff frequency setting Range 0 16 Default 11 Typical set command 0100EW 0100IA 11 Typical set response 0001IA 11 Typical read command 0100IA Typical read response 0001IA 11 Refer to the following table for a list of ranges for IA values cutoff frequencies measurement resolution and the number of digits reported NANO RESOLUTION FEATURES amp FUNCTIONS 8 2 Cutoff Effective Period Measurand Pressure IA Frequency Time Resolution Resolution amp Temp Interval Digits Hz ms dB dB 0 1400 0 1 82 62 790 ppm 6 1 700 1 94 74 200 ppm gi 2 350 2 105 85 56 ppm E 3 175 3 117 97 14 ppm 8 4 88 6 127 107 4 5 ppm 8 5 44 11 140 120 1 0 ppm 8 6 22 22 149 129 0 35 ppm 9 7 11 44 157 137 0 14 ppm 9 8 5 5 89 167 147 45 ppb 10 9 2 8 178 177 157 14 ppb 10 10 1 4 350 186 167 4 5 ppb 11 11 0 7 700 196 176 1 6 ppb 11 12 0 35 1400 203 183 0 7 ppb 12 13 0 18 2800 206 186 0 5 ppb 12 14 0 09 5600 207 187 0 4 ppb 12 15 0 045 11200 207 187 0 4 ppb 12 16 0 023 22400 207 187 0 4 ppb 12 Cutoff Frequency is the 3dB point of the low pass IIR filter
12. 07 degree C The temperature probe is surrounded by a fan aspirated solar shield which greatly reduces the effects of direct and reflected solar radiation MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 19 Temperature Calibration Overview MET3 Only The MET3 electronics and temperature sensors are separately calibrated against a NIST traceable temperature reference standard over the entire operational temperature range The resulting coefficients for the electronics and the temperature sensor are combined into a single set of system level coefficients Each MET3 is then conformance tested over the entire operational temperature range to ensure specified temperature measurement accuracy MET3A Only The MET3A incorporates a precision thin film RTD to sense temperature A thermal chamber is used to control environmental temperature and an independently calibrated NIST traceable thermistor is used as a temperature reference The MET3A humidity temperature sensor is enclosed in a small isothermal block that includes a bore designed to accept a standard 0 125 diameter temperature reference probe The bore terminates in close proximity to the humidity temperature sensor assuring good isothermal contact between it and the temperature reference probe The MET3A RTD sensor and electronics are simultaneously calibrated by taking reference probe temperature and MET3A temperature measurements at various stable points over the range of
13. Overview All Digiquartz Barometric Standard transducers are calibrated and conformance tested over their operational pressure and temperature ranges against NIST traceable standards Transducer output and applied pressure are recorded at test pressures that span the transducer range over a minimum of at least six different temperatures These measurements are used to derive calibration coefficients for the best fit for each individual transducer The differences between the indicated pressures and the applied pressures from the primary standard are less than 0 08 hPa for Digiquartz barometers Temperature Sensor The temperature sensor is a precision thin film platinum 1000 ohm resistance element RTD The sensor was chosen for its accuracy and long term stability The resolution of the sensor is better than 0 01 degree C and the accuracy is better than 40 1 degree C over the full temperature range from 50 to 60 degrees C MET3 Only The temperature probe is surrounded by a Gill multi plate solar shield which greatly reduces the effects of direct and reflected solar radiation When placed in full sunlight and still air the temperature rise at the sensor is approximately 1 degree C This effect decreases rapidly with wind speed and is less than 0 4 degrees C at a wind speed of 3 m s MET3A Only The time constant of the fully packaged sensor is approximately 15 minutes and the self heating of the sensor in still air is less than 0
14. TYPICAL REPLY 0001CS 5 Check counter timebase Supported on all transmitters having a separate timebase for the microprocessor and the counter ACTION Puts counter timebase divided by 512 onto display clock line pin 6 on 9 pin connector or pin 11 on 25 pin connector Cancelled by next command The counter timebase is very stable however several microseconds of jitter appear on the output waveform because the microprocessor interrupts which generate the divided output are asynchronous relative to the counter timebase TYPICAL COMMAND 0100CT TYPICAL REPLY None Check crystal ACTION Puts microprocessor clock divided by 480 onto display clock line pin 6 on 9 pin connector or pin 11 on 25 pin connector Cancelled by next command TYPICAL COMMAND 0100CX TYPICAL REPLY None 8 COMMANDS ARE NOT SUPPORTED FOR TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 FIRMWARE VERSION R1 00 AND LATER COMMAND DESCRIPTIONS 6 18 CALIBRATION COMMANDS SN PA PM TC NOTE CHANGING THESE VALUES PERMANENTLY ALTERS THE CALIBRATION The commands below are used to read or change the transmitter calibration coefficients Altering values requires a prior EW command NOTE These commands cannot be global commands Read enter transmitter serial number ACTION Same as other coefficients SN is 6 digits long TYPICAL COMMAND 0100SN Read present value TYPICAL REPLY 0001SN 004876 TYPICAL COMMAND 0100EW 01
15. This indication may be toggled on and off by using the Mode MD command When the Mode is set to MD 4 a plus sign will be appended to temperature measurement data if the fan is not operating properly Example Read or set the Mode MD parameter Read the Mode setting Command 0100MD Response 0001MD 04 The mode is set to report fan status Set the Mode setting Command 0100EW 0100MD 4 Response 0001MD 04 The mode is set to report fan status Example Read a temperature reading with the fan status indication MD 4 fan OK Command 0100TT Response 000122 23 Example Read a temperature measurement with the fan status indication MD 4 fan not working Command 0100TT Response 000122 23 0001 22 23 example of negative temperature values NOTE The fan status indication applies to the TT A1 and P9 commands Digiquartz Intelligent Interface Commands Not Supported by the MET3 MET3A The following commands are not supported in the MET3 MET3A Refer to Digiquartz Programming and Operations manual for descriptions Display Commands DC DD DP DR DV Tare Commands BP OP ZS ZV ZL 16 Bit Interface Commands LL LH IM IC MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 12 CONNECTOR DIAGRAM Double check that the power to the MET3 MET3A unit is correct in voltage requirements MET3 7Vdc to 16Vdc 20mA nominal 200mA maximum MET3A 7Vdc to 16Vdc 105mA nominal 200mA maxim
16. ee eee ese eee 8 2 CONFIGURING IIR FILTER MODE ese de ese see se ee seeks 8 2 DEFAULT NUMERIC FORMAT FOR UR FILTER 8 4 CONTROLLING THE NUMERIC FORMAT ee 8 4 TABLE OF CONTENTS i SECTION PAGE 9 10 11 12 13 14 RESOLUTION INTEGRATION TIME amp SAMPLING SPEED 9 1 HIGH SPEED SAMPLING ee see sesse se ese see se ese see se ese see be ese see be ese see Se ee ees 10 1 MULTIPLE TRANSMITTERS ON THE RS 232 BUS 00e 11 1 TARING AND OVERPRESSURE WARNING eeue sesse see sesse see sesse sees 12 1 MET3 MET3A INSTALLATION OPERATION AND MAINTENANCE idees esse Gee sedes bees oe e vadra cascina ken be sa Ne ees Ge ee 13 1 INTRODUGTION see se aria se or gee de de oe ee de en cea 13 1 PERFORMANCE SPECIFICATIONS ese ee ee ee ee ee ee ee ee ee ee ee ee ee 13 1 HARDWARE DESCRIPTION ees ee sees se se ee ee ee ee ee ee ee ee ee ee ee ee ee 13 2 FIELD INSTALLATION iese ves Se Ee ii 13 3 BENCH TEST amp GPS RECEIVER INTERFACE INFORMATION 13 6 COMMANDS pri iii 13 7 CONNECTOR DIAOGRANM li 13 13 MAINTENANCE x GR eege La LL Heck ie 13 14 MET3 Maintenance Procedures ee ee ee ee ee ee ee ee 13 14 MET3A Maintenance Procedures ee ee ee ee ee 13 16 NOTES ON CALIBRATION OF MET3 MET3A SENSORS 13 19 INTELLIGENT INTERFACE COMMAND SUMMARY 13 22 SUPPLIMENTAL INFORMATION aen oe
17. from 300 to 19200 baud Input levels Any RS 232C compatible level Output levels 5 VDC nominal Data framing 8 data bits no parity one stop bit Handshaking Not required POWER REQUIREMENTS e TRANSMITTERS AND DEPTH SENSORS SHIPPED PRIOR TO 10 01 2001 6 TO 16 VDC Typical current drain 12 mA Quiescent 14 mA at 1 sample s 25 mA Max 25 mA Peak Instantaneous Current e TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 01 2001 WITH FIRMWARE VERSION RI OO R3 00 6 TO 16 VDC Typical current drain 3 mA In Sleep Mode 17 mA Quiescent 38 mA Max SPECIFICATIONS 3 1 e TRANSMITTERS AND DEPTH SENSORS SHIPPED WITH FIRMWARE VERSION R4 00 AND LATER 6 TO 16 VDC Typical current drain 7 mA In Sleep Mode 12 mA Quiescent 16 mA Max SAMPLING MODES Single sample and send Synchronized sample and hold Continuous sample and send Special burst sampling modes SAMPLE INTEGRATION TIME User selectable in approximately 3 ms steps from 3 ms to 30 s SAMPLE SPEED Depends on integration time Up to 50 samples s in normal modes Up to 135 samples s in burst sampling modes RESOLUTION Depends on integration time User selectable in 15000 steps Typically 100 ppm full scale at 70 samples s 10 ppm at 8 samples s 1 ppm at approximately 1 sample s 0 1 ppm once every 15 s PRESSURE UNITS User selectable Choice of psi hPa mbar bar kPa MPa inches of Hg Torr meters of water or user definable SPECIFICATIONS 3 2
18. of microprocessor clock NANO RESOLUTION COMMANDS XM Resolution mode IA IIR mode cut off frequency XN Number of significant digits A NOT SUPPORTED FOR TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 FIRMWARE VERSION R1 00 AND LATER SUPPLEMENTAL INFORMATION 14 16 CALIBRATION COMMANDS WARNING THE FOLLOWING COMMANDS AFFECT PRESSURE TRANSDUCER ACCURACY SN Read enter transmitter serial number PA Read enter pressure adder PM Read enter pressure multiplier TC Read enter timebase correction factor C1 Read enter CI pressure coefficient C2 Read enter C2 pressure coefficient C3 Read enter C3 pressure coefficient DI Read enter DI pressure coefficient D2 Read enter D2 pressure coefficient T1 Read enter TI pressure coefficient T2 Read enter T2 pressure coefficient T3 Read enter T3 pressure coefficient T4 Read enter T4 pressure coefficient T5 Read enter TS pressure coefficient U0 Read enter UO temperature coefficient Y1 Read enter Y1 temperature coefficient Y2 Read enter Y2 temperature coefficient Y3 Read enter Y3 temperature coefficient ID READ ONLY FOR TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 FIRMWARE VERSION R1 00 AND LATER SUPPLEMENTAL INFORMATION 14 17 NOTES SUPPLEMENTAL INFORMATION 14 18 Paroscientific Inc 4500 148 Avenue N E Redmond WA 98052 USA Tel 425 883 8700 Fax 425 867 5407 http www paroscientific com Doc Number 81
19. optimize resolution noise rejection and sample rate for a wide variety of applications by using the PR command Transmitters are shipped with the value PR 238 stored in EEPROM The relationship between PR pressure resolution integration time and maximum sampling rate is shown in the table below Pressure Signal Pressure Integration P2 period P4 pressure PR Resolution fs Time max max ppm s samples s samples s 10000 0 05 28 0 0 036 0 02 2380 0 1 6 7 0 15 0 08 1190 0 2 3 3 0 30 0 16 476 0 5 1 3 0 75 0 40 238 1 0 67 1 5 0 80 119 2 0 33 3 0 1 6 48 5 0 13 7 3 4 0 24 10 0 07 14 8 0 12 20 0 033 28 15 6 40 0 017 55 30 4 60 0 011 85 46 3 80 0 0084 115 61 1 240 0 0028 274 159 NOTE The reference values shown above are for a transmitter in standard resolution mode only with a pressure signal period Pper of 28 microseconds and a temperature signal period Tper of 5 8 microseconds Values may vary by about 20 for different transmitters of the same model and by up to 35 for different models when PR TR are used to set integration time Data rates are somewhat slower than the integration time would suggest due to processing overhead This effect becomes more pronounced as the data rate increases The baud rate may need to be increased to achieve high data rates RESOLUTION INTEGRATION TIME amp SAMPLING SPEED 9 1 Resolution integration time and maxi
20. transmitter output connector CONNECTING TO THE TRANSMITTER ELECTRICAL CONNECTOR Because our equipment is used in many different applications a number of different output connectors are used The most common is a 9 pin D connector Output connector diagrams and pin assignments for all of our products are given in Appendix B The user should locate the data to computer data from computer and signal ground pins on the appropriate diagram These must be connected to the computer serial port SUPPLEMENTAL INFORMATION 14 1 CONNECTING TO THE COMPUTER RS 232 PORT Most computer RS 232 ports have either male or female 25 pin or 9 pin connectors The most common computer pin connections are tabulated below Check your computer manual to verify pin assignments IBM PC AT STANDARD RS 232 9 pin 25 pin 3 Data from computer 2 Data from computer 2 Data to computer 3 Data to computer 5 Signal ground 7 Signal ground 4 DTR 20 DTR 8 CTS 5 CTS 6 DSR 6 DSR 1 CD 8 CD 1 Frame ground Our transmitter requires only connections for data from computer data to computer and signal ground However depending on the user computer and how a program opens up the RS 232 port the user may need to provide handshaking signal levels by enabling jumper pins on the computer connector If messages cannot be retrieved from the transmitter ensure that the baud rate is correct and that the communications channel is set up for 8 data bits no parity 1 s
21. 00SN 004444 Change value TYPICAL REPLY 0001SN 004444 Read enter pressure adder in units selected by UN setting Read enter pressure multiplier ACTION Same as for other coefficients Intended for offset and span adjustments to calibration Output P PM Pcalc PA where Pcalc is pressure calculated using original calibration data and UN TYPICAL COMMAND 0100PA TYPICAL REPLY 0001PA 0000000 TYPICAL COMMAND 0100EW 0100PM 1 00002 TYPICAL REPLY 0001PM 1 000020 Read enter timebase correction factor ACTION Same as other coefficients TC 10 MHz TCXO freq TYPICAL COMMAND 0100TC TYPICAL REPLY 0001TC 6666667 TYPICAL COMMAND 0100EW 0100TC 6666666 TYPICAL REPLY 0001TC 6666666 9 COMMANDS ARE READ ONLY FOR TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 FIRMWARE VERSION R1 00 AND LATER COMMAND DESCRIPTIONS 6 19 C1 C2 Read enter C2 pressure coefficient as above C3 Read enter C3 pressure coefficient as above DI Read enter D1 pressure coefficient as above D2 Read enter D2 pressure coefficient as above T1 Read enter T1 pressure coefficient as above T2 Read enter T2 pressure coefficient as above T3 Read enter T3 pressure coefficient as above T4 Read enter T4 pressure coefficient as above T5 Read enter T5 pressure coefficient as above U0 Read enter UO pressure coefficient as above Y1 Read enter Y1 pressure coefficient as above Y2 Read enter Y2 pressure co
22. 07 001 Rev AG E mail support paroscientific com Paroscientific Inc 2013
23. 100P4 TYPICAL REPLY 0001555 444 0001555 447 0001555 444 etc Sample and hold one compensated pressure ACTION Same as P3 except save reading and await DB command TYPICAL COMMAND 0100P5 TYPICAL REPLY None until DB or DS command received Sample and hold one pressure signal period ACTION Same as P1 except save reading and await DB command TYPICAL COMMAND 0100P6 TYPICAL REPLY None until DB or DS command received Burst sample pressure read temperature once then continuously send pressure compensated with original temperature reading ACTION Start temperature count read count when done start pressure count compute temperature compensated pressure coefficients and save for repeated use read pressure count when done restart pressure count correct pressure count for timebase and integration time calculate pressure send reading wait for next pressure count and loop until stopped TYPICAL COMMAND 0100P7 TYPICAL REPLY 0001555 444 0001555 447 0001555 444 etc Q1 Q2 Q3 Q4 Q5 Sample and send one temperature signal period ACTION Start temperature count read count when done correct for timebase and integration time send reading await next command TYPICAL COMMAND 0100Q1 TYPICAL REPLY 00015 812345 Continuously sample and send temperature signal period ACTION Start temperature count read count when done restart count correct count for timebase and integration time se
24. 14 1 APPENDIX A HOOKUP iii 14 1 APPENDIX B CONNECTOR PIN ASSIGNMENTS 14 3 APPENDIX C PROGRAMMING HINTIS ese se ee ee ee ee ee ee n ee ee 14 8 APPENDIX D SAMPLING COMMANDS ee se ee ee ee ee ee ee ee ee 14 10 APPENDIX E CALCULATION OF PRESSURE 14 11 APPENDIX F ZERO AND SPAN ADJUSTMENTS 14 12 APPENDIX G SORIWAREVERSIONS ee se ee ee ee ee ee ee ee ee 14 13 APPENDIX H COMMANDULIST se ee ee ee ee ee ee ee ee ee ee ee ee ee ee 14 15 TABLE OF CONTENTS ii 1 INTRODUCTION This manual describes the programming and operation of Paroscientific s line of intelligent instruments with the RS 232 interfaces only These instruments have a common instruction set except for the Model 760 where noted throughout this manual Please visit our website at www paroscientific com for the latest manual revision The Intelligent Transmitter Portable Pressure Standards and RS 232C serial interface boards each provide direct digital pressure output in the user s choice of engineering units to a computer or other RS 232 serial host device The intelligent devices receive commands and data requests via a two way RS 232 port and return data via the same bus Up to 98 transmitters can be attached to a single RS 232 port Powerful easy to use program commands allow the user to address any or all transmitters on the bus and control data sampling rates s
25. 4 13 2 02 Minor reset improvements after changes in configuration 2 03 Multi drop capability added R1 00 Hardware and Firmware revision R1 01 General maintenance revision R2 00 Support for S3 Processor R2 01 General maintenance revision R3 00 Added power saving features R4 00 General maintenance revision R4 01 General maintenance revision R4 02 General maintenance revision Different versions of the software are used for other models as follows VERSION MODEL 60 xx Model 760 M1 02 MET3 MET3A SUPPLEMENTAL INFORMATION 14 14 APPENDIX H COMMAND LIST SAMPLE COMMANDS May be used as global 99 commands P1 P2 P3 P4 P5 P6 P7 Q1 Q2 Q3 Q4 Q5 Q6 DB Sample and send one pressure sensor period Continuously sample and send pressure periods Sample and send one pressure Continuously sample and send pressure Sample and hold one pressure Sample and hold one pressure period Burst and sample pressure read temperature once then continuously send pressure compensated using original temperature Sample and send one temperature period Continuously sample and send temperature periods Sample and send one temperature Continuously sample and send temperature Sample and hold one temperature Sample and hold one temperature period Dump buffer Sends values being stored DS Dump sequential Sends stored values in sequential order CONFIGURATION CONTROL COMMANDS BR BL ID PT EW Enter baud
26. 444 Dump sequential Usually a global command ACTION Similar to DB command except it guarantees that the data from multiple transducers comes back in sequential order Sends reading saved during a P5 P6 Q5 or Q6 sample and hold command and then sends a global DS command to trigger the next transmitter in the loop The DS command must be the next command addressed to the transmitter after the sample and hold If the DS command arrives before the sample is ready data are sent when ready TYPICAL COMMAND 9900DS TYPICAL REPLY 000114 576 First transmitter 000214 577 Second transmitter 9900DS 5 NOT SUPPORTED FOR TRANMITTERS AND DEPTH SENSORS SHIPPED WITH FIRMWARE VERSIONS R1 00 R2 01 COMMAND DESCRIPTIONS 6 4 MEASUREMENT INTEGRATION TIME COMMANDS Digiquartz Intelligent devices sample the transducer s pressure and temperature signals for a length of time specified by the measurement integration time commands The measurement integration time has a direct affect on sampling rate and measurement resolution See Section 9 for details PI and TI are the primary integration time commands for pressure and temperature signal measurement The legacy commands PR and TR may also be used The advantage of PI and TI is that the specified integration time is expressed directly in milliseconds NOTE The legacy commands PR and TR traditionally specified the number of signal periods to sample This integration scheme has been replac
27. C2U C3U2 D D D2U T T4 DU T3U2 T4U3 T5U4 These equations express temperature and pressure in terms of the transducer calibration coefficients Temperature coefficients Ug Y Ya Y3 Pressure coefficients Cy C2 C3 Dj D2 Ty T2 T3 T4 Ts These coefficients are stored in EEPROM and can be obtained from the transmitter via the RS 232 bus Final output pressure is computed from the above using the following equation P output PM units multiplier x P PA When units are changed using the UN command PA is automatically recalculated to be correct in the new units SUPPLEMENTAL INFORMATION 14 11 APPENDIX F ZERO AND SPAN ADJUSTMENTS Commands PA and PM can be used for minor transmitter zero and span adjustments Normally the pressure adder PA is set to zero and the pressure multiplier PM is set to 1 0 Adjusted pressure is calculated using the equation P adjusted PM x P PA where P is the pressure calculated using the original calibration coefficients and the selected unit factor The user enters PA in the selected units The transmitter converts the entered value to psi before storing it Whenever the transmitter is asked to send the value of PA it will be reconverted and sent in the units in effect at the time of the request The PA parameter can also be used to offset absolute pressure readings to read gauge pressure WARNING Be very careful when using the PA and PM commands because th
28. G Paroscientific pressure transducers can be damaged by the application of pressure greater than 1 2 times their rated full scale pressure Users should protect the transducer with overpressure relief valves in applications where overpressure could be applied The software command OP sets the overpressure warning level Pressure in excess of this limit triggers a 5 volt logic level on the RS 232C Serial Interface Board and triggers a warning beeper on the Model 760 TA RING Taring is the subtraction of an initial value from pressure readings This feature is activated and used with software commands ZS ZV and ZL as described in Section 6 On the Model 760 taring is initiated by a front panel switch and remains in effect as long as the switch remains closed On some 9 pin versions of the RS 232C Serial Interface Board NOT MODEL 760 Tare Request Tare Indicator and Overpressure Warning can be brought out on unused pins of the 9 pin output connector Contact Paroscientific for details TARING AND OVERPRESSURE WARNING 12 1 13 MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE INTRODUCTION The Paroscientific MET3 MET3A Meteorological Measurement System is a precision instrument that measures barometric pressure temperature and relative humidity The MET3 MET3A may be interfaced to a variety of instruments including personal computers GPS receivers and data loggers The MET3 MET3A is packaged in a rugged weather resistant
29. ICAL COMMAND 0100EW TYPICAL REPLY None NOTE The following commands cannot be global commands UN Read enter choice of pressure units ACTION Selects unit conversion factor by which all computed pressures are multiplied before output UN 1 to 8 selects from eight standard sets of units UN 0 chooses the user defined multiplier which is set with command UF UN UNITS MULTIPLY PSI BY 1 psi 1 0000000 2 mbar or hPa 68 94757 3 bar 06894757 4 kPa 6 894757 5 MPa 00689476 6 in Hg 2 036021 7 mm Hg or torr 51 71493 PARAMETER IS READ ONLY PROTOCOL IS FIXED AT 8 DATE BITS NO PARITY AND 1 STOP BIT IN TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 COMMAND DESCRIPTIONS 6 8 UF 8 m H20 0 user defined TYPICAL COMMAND TYPICAL REPLY TYPICAL COMMAND TYPICAL REPLY 7030696 set by UF command 0100UN What are units 0001UN 4 Units are kPa 0100EW 0100UN 2 Set to mbar 0001UN 2 For fresh water applications only For sea water applications consult the application note Digiquartz Depth Sensor Ocean Depth Conversion at http www paroscientific com Read enter user defined unit conversion factor ACTION Allows users to convert pressure to any desired set of units by defining a conversion factor Then when UN 0 is selected the output pressure will be psi UF TYPICAL COMMAND TYPICAL REPLY TYPICAL COMMAND 0100UF Present factor 0001UF 1 000000 0100EW 0100UF
30. L Zero lock ACTION If ZL is set to 1 the taring feature is locked out If ZL is set to 0 the tare contact closure and ZS 1 commands are enabled Not supported on Model 760 TYPICAL COMMAND 0100ZL TYPICAL REPLY 0001ZL 1 Taring disabled COMMAND DESCRIPTIONS 6 15 TIME REFERENCE STAMP COMMAND TS NOTE The time reference stamp feature is available in firmware version 4 10 or later A time reference stamp can be appended to pressure and temperature measurement data to help you determine when the pressure or period measurement was taken relative to the transmission of the measurement command response The time reference value reported is the time interval between the midpoint of the integration period and the start of the transmission of the first ASCII character of the response data Enables and disables the time reference stamp feature The TS command affects the following measurement commands P1 P2 P3 P4 P5 P6 P7 Q1 Q2 Q3 Q4 Q5 and Q6 ACTION When is enabled a comma delimited time reference stamp is appended to the measurement values returned by the aforementioned commands expressed in microseconds RANGE 0 Time reference stamp disabled 1 Time reference stamp enabled TYPICAL SET COMMAND 0100EW 0100TS 1 TYPICAL SET RESPONSE 0001TS 1 TYPICAL READ COMMAND 0100TS TYPICAL READ RESPONSE 0001TS 1 The time reference value reported is the time interval between the midpoint of the integrat
31. O RESOLUTION COMMANDS XM Resolution mode IA IIR mode cut off frequency XN Number of significant digits S NOT SUPPORTED FOR TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 FIRMWARE VERSION R1 00 AND LATER COMMAND LIST 5 2 CALIBRATION COMMANDS WARNING THE FOLLOWING COMMANDS CAN CHANGE THE CALIBRATION COEFFICIENTS SN Read enter transmitter serial number PA Read enter pressure adder PM Read enter pressure multiplier TC Read enter timebase correction factor C1 Read enter C1 pressure coefficient C2 Read enter C2 pressure coefficient C3 Read enter C3 pressure coefficient D1 Read enter DI pressure coefficient D2 Read enter D2 pressure coefficient T1 Read enter T1 pressure coefficient T2 Read enter T2 pressure coefficient T3 Read enter T3 pressure coefficient T4 Read enter T4 pressure coefficient T5 Read enter TS pressure coefficient U0 Read enter UO temperature coefficient Y1 Read enter Y1 temperature coefficient Y2 Read enter Y2 temperature coefficient Y3 Read enter Y3 temperature coefficient 4 READ ONLY FOR TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 FIRMWARE VERSION R1 00 AND LATER COMMAND LIST 5 3 6 COMMAND DESCRIPTIONS For commands specific to nano resolution please refer to Section 8 SAMPLING COMMANDS may be used as global commands P1 P2 P3 Sample and send one period measurement of the pressure signal in microseconds ACTION Start pressu
32. Paroscientific Inc Digiquartz Pressure Instrumentation User s Manual For Intelligent RS 232 Only Instruments Series 1000 6000 9000 Intelligent Transmitters Model 760 Portable Field Standard Series 8DP 8WD 8B Intelligent Depth Sensor MET3 And MET3A Broadband Meteorological Measurements Systems PS 2 Water Stage Sensor The standard by which other standards are measured Technology DIGIQUARTZ PRECISION PRESSURE INSTRUMENTS USER S MANUAL FOR INTELLIGENT RS 232 ONLY INSTRUMENTS SERIES 1000 6000 9000 INTELLIGENT TRANSMITTER MODEL 760 PORTABLE FIELD STANDARD SERIES 8DP 8WD 8B INTELLIGENT DEPTH SENSOR METZ AND MET3A BROADBAND METEOROLOGICAL MEASUREMENT SYSTEMS d PS 2 WATER STAGE SENSOR DOCUMENT NO 8107 001 REVISION AG September 2013 Please visit www paroscientific com for the latest manual revisions COPYRIGHT 2013 PAROSCIENTIFIC INC TABLE OF CONTENTS SECTION PAGE 1 INTRODUCTION esesesseeseseesaeseesse sesse Ee Be Ee Bee Ee Se EG Be Ee Be ee Gee se 1 1 2 HARDWARE DESCRIPTION ee sesse esee se esse sees se sees se ees se ee Be ee See se ee 2 1 3 SPECIFICATIONS eesse esse sesse sesse see se EE Be EE SEE GE Ge tsss Be EG Be ee Ee Se ee 3 1 4 HOW TO GET STARTED 10 esse esse esse esse ese see see See bee Ge SG EG ee Se ee 4 1 lk a E ER LR 4 1 Pressure Ports and Buffer Tubes se ee ee ee ee Ge ee ee ee 4 2 Oil Filled vs Non Oil Filled
33. RH Command 0100AR Response 0001AR 0 To change AR value Command 0100EW 0100AR 1 Response 0001AR 1 Read or set zero adjustment coefficient for calculated temperature value Command 0100Z1 Response 0001Z1 4 H NOTE Changing this parameter affects temperature calibration Read or set zero adjustment coefficient for calculated humidity value Command 0100Z2 Response 0001Z2 4H NOTE Changing this parameter affects humidity calibration Read or set span adjustment coefficient for calculated temperature value Command 0100M1 Response 0001M1 NOTE Changing this parameter affects temperature calibration MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 10 M2 Read or set span adjustment coefficient for calculated humidity value Command 0100M2 Response 0001M2 NOTE Changing this parameter affects temperature calibration E1 F2 F1 F2 G1 G2 H1 H2 K1 K2 Read or set temperature and humidity calibration coefficients Channel 1 E1 F1 G1 H1 K1 temperature Channel 2 E2 F2 G2 H2 K2 humidity Example Command 0100E1 Response 0001E1 NOTE Changing these parameters affects the temperature and or humidity calibration MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 11 Aspiration Fan Status Indicator MET3A Only A warning character can be added to the temperature data to indicate the operational status of the aspiration fan
34. TH YUerogje0o amjeradure UIMIYNIS IH ID JUSTo1je0o armeiaduia UIMIYNIS ID TH JUSTO1S09 ormeredurs UIMIYIS Id TH JU919 J909 sinyesodurs UMIIYA HX 7 Puueyo Fojeue 107 uaro1jjs02 quounsnfpe ueds ay UIMIYNIS LU I Touueys Soeue 107 Juarogje02 quounsnfpe ueds am uimay leS HA 7 Iouuegs Fo eue 10 Yaro1jje03 juaunsnlpe 019Z UIMIYNIS L I Jouueyo Sofeue 10 JusToyja02 juaunsnlpe OIZ UIMIYNIS HA 510 Do 10 0 ST uonnrosar dio A ATO Do TO ST UOnNosaI indino uan UV uonnfoseI Soeur JUIN WINDY HA 7 UU Foeue 10 JUNOD 19394U1 Soqeue Up Una 2 aide ZN L Touueys Fojeue 107 JUNOD 19394U1 Fopeue ue umy 2 dueg mm 33pyuso1ad ur jaatamstar ANPILUNY JEUX ue UMJ 29 oldues WIHA Dp UI JUotMOINsvat oINyeIoduI9 Jeux UMJI 2 dues IVIOLL IMEJSP TM JOPESU VANN pouged res men CIN SONTEA erep pauo VAINN Mia puodse1 pue aide KAVINANS ANVININOZQUO VATHINI INHOTTTHINI VE ELHIN 14 SUPPLIMENTAL INFORMATION APPENDIX A HOOKUP FOR RS 232 ONLY DIGIQUARTZ SENSORS GENERAL DESCRIPTION Hookup consists of providing power to the transmitter and running receive transmit and signal ground lines from the transmitter to the computer RS 232 output connector The required connections are shown schematically in the figure below gt CONNECTO JATA TO CO TER at Oh CO UTE Gen TRANSMITTER 16 TO Proper connection reguires identifying the correct output pins on the computer RS 232 port and on our
35. a output the device will never enter sleep mode regardless of the values of SL or ST 7 SUPPORTED IN TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 FIRMWARE VERSION R1 00 AND LATER COMMAND DESCRIPTIONS 6 11 ST Set or read the sleep mode timeout length ACTION When SL 1 the device enters sleep mode if both serial ports have received no characters for ST seconds UNITS Seconds RANGE 5 to 255 integer values only DEFAULT 10 TYPICAL COMMAND 0100EW 0100ST 5 TYPICAL RESPONSE 0001ST 5 TYPICAL COMMAND 0100ST Typical response 0001ST 5 COMMAND DESCRIPTIONS 6 12 TARE AND OVERPRESSURE COMMANDS BP OP ZS NOTE These commands are supported only on Intelligent Transmitters and RS 232C Serial Interface Boards with 9 pin connectors and on the Model 760 pressure standard Beep ACTION Causes the overpressure warning beeper to sound for approximately one second Model 760 only TYPICAL COMMAND 0100BP TYPICAL REPLY None Overpressure ACTION Read or set the value of the overpressure limit Any pressure reading greater than this value triggers an overpressure warning On intelligent transmitters and RS 232 interface cards overpressure causes the overpressure indicator line to go high 5 volts The indicator line goes low again if measured pressure drops below the limit For purposes of determining overpressure untared pressure with no PA is used Operation of the Model 760 is sim
36. alue in 5 minutes In addition there can be hysteresis effects of a few percent after prolonged exposure to humidity above 90 RH Relative Humidity Calibration The MET3 MET3A humidity sensor is a standard humidity probe characterized by the manufacturer All MET3 MET3A units are conformance tested against a transfer standard to ensure proper performance MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 21 Gei HONVNHLNIVIN NOLLVAAdO NOLLVTIVLSNI VELAWELAN 0000001 THT000 asuodsay puo 444HHH CM T 000 HHHHHH TCHI 000x DRM DT 000 H4444HH CA1000x Kaell bel M1000x 44H4H I HI000x 44HHH471O1000x HH4H 4 1A41000x 444H 191000x HH4H4HH CINT 000 HHHHHH TINTO00x HHHHHH TZI 000x 4H44HH 1IZ1000 T aV1000 0 aV 1000 HHH L000 HHHH T OOO 1000 HE 1000x IM HNI000 HISNOdSHY LOAdLOO TO TAOOTO AHOOTO pw MAOOT Ox CAOOTO CHOOTO COOOTO TAO010x GAOOTO TMOOTOx THOOTOx TOOOTO TAOOTO THOO10 CINOOTO TINOOTOs CZOO10 TZOOTO ZNOOTO TNOOTO ZGVOOLO HUHOOTLO TVOOLO LLOOTO HNOOI0 aX IMs 6d0010 ONVININOOD LAdNI NOLLATAOSAG ONVININOOD T 0 0 JuaTOIJJo09 armeradwua 14 WLY and pueumioo ego e ag Aew Bums puewuos SU0 10 HA WOYdA olgeug Ma TA 1091013900 ANPILINY UIMINNIS 7A TH 1431914309 ANPIUNY LIMIN9S CH TO ua oyyoos ANPILUNY UMAS tO TA 3U910YJI0I yrprumy Vum og td Cato ANPILINY UIMINNIS za DI III amjereduaa UMIIYA
37. ample integration time baud rate and other operating parameters Pressure values are output in any of eight standard sets of engineering units or in user definable units Output pressure data is fully compensated for temperature effects over the calibrated temperature range The different models can easily be mixed on the same RS 232C bus The same basic commands are used with all models A few additional commands control special features unique to some models Although the following sections apply to the pressure sensor of MET3 and MET3A Broadband Meteorological Measurement System please read the MET3 MET3A section for more specific information LATEST FEATURES Starting with firmware revision R5 10 or later it is now possible to achieve parts per billion resolution nano resolution as opposed to parts per million resolution in standard mode This feature can be easily enabled disabled via software commands Please refer to Section 8 for additional information on this new feature INTRODUCTION 1 1 2 HARDWARE DESCRIPTION Digiquartz Intelligent Transmitters Portable Pressure Standards Intelligent Depth Sensors MET stations and Water Stage Sensors consist of a standard Paroscientific pressure transducer and a digital interface board in an integral package The digital interface boards are also available separately for customer systems where separate packaging of the transducer and interface board is desired Programming and
38. d with unit to the 34 male pipe thread on the top of the main body of the instrument Ensure that the entire thread is adequately covered with the tape Carefully mate the female thread at the base of the barometer port with the taped male thread and screw the two together HAND TIGHT Do not over tighten these threads Over tightening could cause damage to the threads and impede future disassembly MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 4 ld oa Solar Shield Housing Temperature Humidity Sensor and Aspiration Fan Aspirated Air Inlet MET3A Install the unit in a location where the ports remain unobstructed There should be at least one foot of clearance in all directions and at least four feet of clearance from the ground The ports are designed to minimize effects caused by solar radiation and wind and obstruction of the ports could result in erratic performance For GPS Meteorology applications we recommend that the MET3A be installed with the barometer port at the GPS antenna height MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 5 BENCH TEST AND GPS RECEIVER INTERFACE INFORMATION Please also review our GPS MET support site Integrating Digiguartz MET3 and MET3A Broadband Meteorological Systems with a GPS Receiver found at http www paroscientific com pdf GPSMETIntegration pdf
39. dicators In early 2002 a status indicator panel was added to the MET3 MET3A These status indicators allow you to determine whether input power is applied to the unit and to monitor RS 232 serial activity The status indicator panel is located on the bottom of the of the unit adjacent to the electrical connector The following table explains the function of the status indicators Indicator Color Function Red ON Input power on OFF Input power off Green FLICKERING Activity on RS 232 receive line OFF No activity on RS 232 receive line Yellow FLICKERING Activity on RS 232 transmit line OFF No activity on RS 232 transmit line MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 2 FIELD INSTALLATION This section discusses physical installation of the MET3 MET3A For information on connecting the MET3 MET3A to a PC or GPS receiver please review our GPS MET support site Integrating Digiguartz MET3 and MET3A Broadband Meteorological System with a GPS Receiver found at http www paroscientific com pdf GPSMETIntegration pdf MET3 3A Physical Installation Mounting The MET3 MET3A is packaged to withstand adverse field conditions and no additional shielding or protection is required We recommend that the MET3 interface cable used to connect to the recording device be protected from long term exposure to the elements A typical installation will include placing the cable in conduit to ensure extend
40. dress 99 allow all transmitters to be addressed with a single command Keep in mind that the maximum number of messages per second on the bus is limited by the baud rate see Section 10 For loops with multiple transmitters the higher baud rates are recommended Logically the structure of the bus is a one way circle A typical three transmitter loop is shown below i o COMPUTER All messages move clockwise around the loop relayed from transmitter to transmitter Each transmitter picks off the messages addressed to it and relays responses or other messages onward When setting up a loop 1 Set all transmitters to the same baud rate before installing them in the loop Two transmitters at different baud rates cannot communicate When all transmitters are at the same baud rate a new baud rate can be chosen with a global BR command 2 Use the global ID command 9900ID to auto number units around the loop and find out how many there are from the source address of the command coming back to the computer MULTIPLE TRANSMITTERS ON THE RS 232 BUS 11 1 3 The serial number of each transmitter can be checked by polling it with the SN command 4 The easiest way to take data is with a global sample and hold 9900P5 followed by a global dump command 9900DS This keeps samples synchronized and keeps the data sorted out at the computer 5 It is possible to have several transmitters simultaneously in continuous
41. e global command Locks baud rate and parity to prevent change Must be global command Auto number transmitters in a loop Must be global command Sets transmitter parity Must be global Enable EEPROM write for one command NOT SUPPORTED FOR TRANMITTERS AND DEPTH SENSORS SHIPPED WITH FIRMWARE VERSIONS R1 00 R2 01 PARAMETER IS READ ONLY FIXED AT 8 DATA BITS NO PARITY AND 1 STOP BIT IN TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 FIRMWARE VERSION R1 00 AND LATER COMMAND LIST 5 1 REMAINING COMMANDS CANNOT BE GLOBAL PI Setor read the pressure measurement integration time TI Set or read the temperature measurement integration time PR Read enter pressure resolution TR Read enter temperature resolution UN Read enter choice of pressure units 0 user defined 3 bar 6 in Hg 1 psi 4 kPa 7 Torr or mm Hg 2 mbar or hPa 5 MPa 8 m H20 UF Read enter user definable units MD Reads or sets power up mode TARE AND OVERPRESSURE COMMANDS BP Sound overpressure beeper OP Read enter the overpressure alarm setting ZS Read the position of the zero set switch ZV Zero value Read the zero offset value ZL Zero lock Enable or disable taring TIME REFERENCE STAMP COMMAND TS Enables and disables the time reference stamp feature SPECIAL DIAGNOSTIC COMMANDS MC Memory check Checks program PROM CS Check stack of microprocessor CT Check counter timebase CX Check crystal of microprocessor clock NAN
42. e required when making or breaking any 1 8 inch pressure fitting The first wrench is used to stabilize the stationary fitting and the second wrench is used to turn the other fitting For the modified 4 HIP fitting one 5 8 wrench and one 3 4 wrench are required to make and break the connections OIL FILLED VS NON OIL FILLED UNITS OIL FILLED TRANSMITTERS Transmitters that are to be used to measure liquid media pressures are oil filled at Paroscientific Transmitters that are oil filled should never be used in gas media applications Oil fill and bleed all pressure lines that are to be connected to an oil filled transmitter The same oil used to fill the transmitter should be used to fill the pressure lines consult the transmitter Specification Control Drawing for details HOW TO GET STARTED 4 2 CAUTION If your transmitter and buffer tube are oil filled do not pull a vacuum or apply pressurized gas to the unit Doing so could allow bubbles to form in the pressure lines and transmitter which will adversely affect the accuracy of the unit CAUTION Pressure head effects result in zero offsets These effects are more pronounced when liquid filled pressure lines are being used These effects can be minimized by keeping the transmitter pressure port and the pressure source at the same elevation or by making an offset correction to compensate for the pressure head NON OIL FILLED TRANSMITTERS Non oil fill
43. ed by integration over a fixed length of time For backward compatibility values input using PR and TR are converted to an equivalent time using nominal pressure and temperature period values PRIMARY INTEGRATION TIME COMMANDS PI Set or read the pressure measurement integration time Units Milliseconds Range 1 to 290000 when XM 0 1 to 72500 when XM 1 Default 666 Typical set command 0100EW 0100PI 1000 Typical set response 0001PI 1000 Typical read command 0100PI Typical read response 0001PI 1000 NOTE Whenever the value of PI is changed TI is automatically updated with the same value TI Set or read the temperature measurement integration time Units Milliseconds Range 1 to 290000 when XM 0 1 to 72500 when XM 1 Default 666 Typical set command 0100EW 0100TI 1000 Typical set response 0001TI 1000 COMMAND DESCRIPTIONS 6 5 Typical read command 0100TI Typical read response 0001TI 1000 NOTE Changing TI has no effect on PI NOTE It is usually recommended that TI and PI be set to the same value NOTE Do not set PI to a value of less that 10 when using a Model 715 display Doing so may result in an inconsistent display LEGACY INTEGRATION TIME COMMANDS PR TR Set or read pressure measurement integration time Units None Range 1 to 16383 integer values only Default 238 Typical set command 0100EW 0100PR 200 Typical set response 0001PR 200 Typical read command 0100PR Typical read re
44. ed cable life and reliable data transmission Proper cable strain relief will minimize cable and connector damage Install the mounting bracket on a pole of not more than 2 inches in diameter An optional flat monument mounting plate is available Be sure the mounting fixture and structure are capable of supporting the weight of the MET3 MET3A under adverse weather conditions The mounting hardware supplied with the MET3 MET3A provides ground isolation from the mounting pole No other ground connection should be made except at the recording device through the cable shield and connector shells as shown in Connector Diagram section The MET3 should be installed vertically with the sun shield and barometric port assembly facing upwards on the top side This position will assure optimum performance of the sensors MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 3 BAROMETER PRESSURE 3 D H PORT RELATIVE HUMIDITY PROBE AND RADIATION __ SHIELD 1870 ER 47 50 i BAROMETRIC I REFERENCE Tr HEIGHT A Base of Unit WEATHES PRODF ELECTRONICS ENCLOSURE MET3 The MET3A must be installed with the barometric port assembly vertical as shown below MET3A units that are delivered with the barometer port dismounted from the main body should be assembled in the following manner Q Apply at least three wraps of Teflon pipe tape supplie
45. ed transmitters are intended for use in gas media applications and should never be used in liquid media applications WARNING If your transmitter and buffer tube are not oil filled do not apply pressurized liquid media to the unit Liquid may contaminate the unit and may adversely affect the accuracy of the unit It is not possible to completely remove most liquids from the transmitter once they have been introduced For additional information see the application note Oil Filled Transducers Accuracy Performance and Handling at www paroscientific com TYPES OF MEASUREMENTS The transmitter can make four types of measurements 1 Pressure Pressure measurements are the most frequently used 2 Temperature internal sensor temperature The sensor internal temperature measurement is intended for thermal compensation of pressure Because the sensor is thermally isolated the internal temperature changes slowly and might be read only occasionally The period measuring commands are used mainly for calibration or diagnostic tests They also can be used for high speed burst sampling 3 Period of the pressure sensor 4 Periodof the temperature sensor HOW TO GET STARTED 4 3 TYPES OF SAMPLING There are four types of sampling 1 Single measurement sample and send e g command P3 Zi Single measurement sample and hold e g command P5 3 Continuous sample and send e g command P4 4 Special high sp
46. eed burst sampling e g command P7 The simplest commands to use are the single sample commands and beginners should start with them Command Transmitter Response P3 Make one pressure measurement and send it to the computer P5 Make one pressure measurement hold value until requested DBorDS Send value being held to computer The difference is that P3 sends data as soon as it is available while P5 holds the data until a DB dump buffer or DS dump sequential request is received P5 is intended primarily for sampling simultaneously with several transmitters and then reading them out one by one The continuous and burst sampling procedures are described later They are more complicated to use because data keeps coming in and user programs must keep up with it HOW TO GET STARTED AA COMMAND FORMAT All commands have the form ddsscc__ lt cr gt lt lf gt Data framing is 8 data bits no parity with one stop bit or 7 data bits with even or odd parity one stop bit Set by command PT 1 2 Each line starts with an asterisk The next 2 digits dd are the destination for the command 00 99 The controller IBM PC etc is address 00 and the transmitters can be 01 through 98 Address 99 is for global A transmitter responds only to its own address or 99 The next 2 digits ss are the source of the message 00 98 The next 2 characters cc specify the type of message and may be followed by more cha
47. efficient as above Y3 Read enter Y3 pressure coefficient as above COMMAND DESCRIPTIONS Read enter C1 pressure coefficient as above 6 20 7 GLOBAL COMMANDS Sometimes it is convenient to have a single command affect all transmitters in a loop For certain instructions using the destination address 99 causes all the transmitters in the loop to respond Some commands can only be sent with a global address They are BR BL ID PT The global address is often used with the sample and hold commands when there are multiple transmitters in a loop The global address synchronizes the transmitters to take measurements at the same time The sample and hold commands are PS and P6 Q5 and Q6 All of the sampling commands and a few other commands may be either individually or globally addressed P1 through P7 Q1 through Q6 DB DS VR EW When a transmitter recognizes a global command it relays it to the next transmitter in the loop before acting on it The result is that the global command echoes around the loop and comes back to the computer in addition to the transmitter responses For all global commands except the VR and DS commands the echoed command precedes the responses GLOBAL COMMANDS 7 1 8 NANO RESOLUTION FEATURES amp FUNCTIONS INTRODUCTION With firmware revision R5 10 it is now possible to achieve parts per billion resolution This feature can be enabled by software command When disabled the sensor
48. er portion of the pressure period value leaving N 2 digits for the fractional portion TEMPERATURE PERIOD One digit is used for the integer portion of the pressure period value leaving N 1 digits for the fractional portion CONTROLLING THE NUMERIC FORMAT The XN command sets the number of significant digits used to report period pressure and temperature measurement values The XN command overrides the default numeric format XN Set or read the number of significant digits Range 0 13 Default 0 Typical set command 0100EW 0100XN 10 Typical set response 0001XN 10 Typical read command 0100XN Typical read response 0001XN 10 When XN is set to 0 the default numeric formats are used When non zero XN specifies the number of significant digits used to report NANO RESOLUTION FEATURES amp FUNCTIONS 8 4 period pressure and temperature measurement values With the exception of the total number of digits all default format characteristics apply The integer portion is never expressed with fewer digits than required regardless of the value of XN The fractional portion is rounded or padded with zeros as required to fit the specified format The XN command works with and without IIR Filter enabled NANO RESOLUTION FEATURES amp FUNCTIONS 8 5 9 RESOLUTION INTEGRATION TIME AND SAMPLING SPEED The resolution of the transmitter is determined by the counter integration time Users can adjust the integration time to
49. eriods to get a temperature period corresponding to each pressure period measurement and uses this pair of periods to calculate the corrected pressure using the equation in Appendix E Note that the transmitter calibration coefficients can be obtained via bus commands The mode parameter MD can affect sampling speed When doing high speed sampling at greater than about 20 samples per second sample rates using commands P3 P4 or P7 will be slightly slower in mode MD 1 or MD 3 than in mode MD 0 or MD 2 because of the extra time required for the display The extra time required is approximately 6 milliseconds per sample for DD 0 and 36 milliseconds per sample for DD 1 Other commands are not affected For example a P4 command that gives 19 samples s for MD 0 will run about 5 slower for MD 1 and a P7 command giving 45 samples s for MD 0 will run about 20 slower for MD 1 HIGH SPEED SAMPLING 10 2 11 MULTIPLE TRANSMITTERS ON THE RS 232 BUS There are three ways to attach multiple transmitters to a single computer 1 a serial loop of several transmitters on a single RS 232 port 2 a relay or logic multiplexer switching a single port sequentially among a number of transmitters and 3 multiple RS 232 ports These are discussed in the following paragraphs 1 SERIAL LOOPS The addressable command structure allows use of up to 98 transmitters simultaneously in a loop on a single RS 232 port Global commands destination ad
50. ey directly affect the transmitter calibration Inaccurate values will result in inaccurate data SUPPLEMENTAL INFORMATION 14 12 APPENDIX G SOFTWARE VERSIONS A number of evolutionary improvements have been made to the hardware and software in the intelligent transmitter to add display capability and extra commands and features We have maintained full forward compatibility so that user programs written for one version operate properly with all later versions and different versions can be mixed on the same loop The hardware and software version of any transmitter can be determined with the VR command If desired any transmitter can be upgraded to support all of the latest features Design changes for all standard 1000 6000 and 9000 series transmitter products are summarized below VERSION 1 00 Original series 2 00 Commands added none Hardware change Input selection modified 3 00 Display capability added Commands added MD DV DC Hardware change display driving 4 00 Refinements to display capability parity seguential dump Commands added DP DR DS MC PT No hardware changes 4 04 Commands BL DD IM IC added 4 05 Hardware change Input select circuit 7 00 Commands added ZL ZS ZV OP Hardware change Tare request indicator OP indicator 7 10 Software change Faster math package 2 00 Surface mount revision transzorbs faster clock 2 01 More significant figures at UN 0 SUPPLEMENTAL INFORMATION 1
51. ffset correction to compensate for the pressure head HOW TO GET STARTED 4 1 PRESSURE PORTS AND BUFFER TUBES Digiquartz Intelligent Transmitters include a nylon or stainless steel buffer tube that is an integral part of the mechanical shock protection system of the transmitter For Series 1000 and 9000 devices the buffer tube is located within the transducer housing For Series 6000 devices it is externally attached WARNING For 6000 Series units DO NOT REMOVE THE EXTERNAL COILED BUFFER TUBE FROM TRANSMITTER Disconnecting the buffer tube from the transmitter pressure fitting may cause irreversible damage to the unit Only make connections to the buffer tube fitting and avoid coupling directly to the transmitter pressure fitting If the transmitter pressure fitting becomes flared stripped or damaged it will be necessary to return the unit to Paroscientific for repairs For additional information see the application note The Use and Handling of Buffer Tubes at www paroscientific com Parker A Lok or equivalent nut and ferrule fittings are used on most Digiquartz Intelligent Transmitters Series 1000 and 6000 devices use the 1 8 OD configuration Series 9000 transmitters are equipped with a modified 4 HIP or equivalent fitting CAUTION It is recommended that all pressure fittings are installed finger tight then tightened an additional turn to complete the pressure seal Two 7 16 wrenches ar
52. housing with a waterproof connector to provide reliable operation under adverse field conditions PERFORMANCE SPECIFICATIONS PRESSURE DIGIQUARTZ BAROMETRIC STANDARD Range 620 to 1100hPa 9 to 16 psia Resolution Better than 0 001 hPa Accuracy including pressure hysteresis repeatability linearity amp temperature conformance Better than 0 08 hPa Stability Better than 0 1 hPa per year TEMPERATURE PLATINUM RESISTANCE TEMPERATURE PROBE Range 50 to 60 C Resolution Better than 0 01 C Accuracy MET3A Better than 0 1 C MET3 Better than 0 5 C Stability Better than 0 1 C per year RELATIVE HUMIDITY CAPACITANCE PROBE Range 0 to 100 Accuracy Better than 42 RH at 25 C Saturation recovery time not applicable 2 minutes or less for MET3 MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 1 HARDWARE DESCRIPTION Required Test And Installation Components 1 MET3 MET3A Meteorological Measurement System MET3 MET3A Interface Cable P N 2319 XXX Digiquartz CD Library Pr DI Power Breakout Supply Kit 9 to 12 VDC from 110 VAC P N 1727 001 or 9 to 12 VDC from 220 VAC P N 1727 002 These items may be optional for your field installation To verify the operation of the device with a PC you will require an external power source and breakout as the PC serial port does not supply power to the MET3 MET3A Paroscientific Power Supply Kit will simplify this process Status In
53. ilar except that overpressure triggers a warning beeper instead of a logic output level Also on the Model 760 OP must be entered in psi TYPICAL COMMAND 01000P TYPICAL REPLY 01000P 10200 0 TYPICAL COMMAND 0100EW 01000P 17 00 TYPICAL REPLY 00010P 17 00000 Zero set ACTION Read or set the value of the zero switch On intelligent transmitters and RS 232 interface cards ZS is a logic switch stored in RAM which controls taring the subtraction of some initial value It has three states ZS 0 when tare is off ZS 1 when taring has been requested ZS 2 when taring is in effect COMMAND DESCRIPTIONS 6 13 ZS is set to 0 on power up Once the taring commands have been activated by setting ZL 0 taring can be requested either with ZS 1 command or by toggling a contact closure line At the first pressure reading following a tare request the measured pressure is stored in RAM parameter ZV parameter ZS is automatically set to 2 to indicate that taring is in effect and the value ZV is subtracted from all subsequent pressure readings until taring is turned off Changing the value of ZS by software command requires an EW command even though ZS is stored in RAM rather than in EEPROM NOTE If taring is already in effect when a ZS 1 command is issued a new zero value is initialized at the next pressure reading and taring continues using the new value Operation of the Model 760 is somewhat different On these m
54. ion period and the start of the transmission of the first ASCII character of the response data expressed in microseconds DL 1 pads the time reference stamp value to 9 digits Examples Pressure 14 74638 time reference stamp 500637 microseconds P3 response DL 0 000114 74638 500637 P3 response DL 1 0001 14 746380000 000500637 Transmission delay COMMAND DESCRIPTIONS 6 16 The response data as seen by the serial host is delayed by the time it takes to transmit the data For high accuracy applications it is necessary to compensate for this delay The formula for calculating the transmission delay time is as follows T N 10 1E6 BR Where T transmission delay in microseconds N number of characters transmitted BR baud rate Don t forget to consider the carriage return and line feed characters when determining the number of characters transmitted Processing delay For high accuracy applications it is also necessary to compensate for any delay by the serial host in acknowledging the first character of the response data COMMAND DESCRIPTIONS 6 17 SPECIAL DIAGNOSTIC COMMANDS MC CS CT Cx Memory check ACTION Checks integrity of PROM program Returns Y if correct N if error TYPICAL COMMAND 0100MC TYPICAL REPLY 0001MC Y Program correct Check stack ACTION Returns number of unused bytes in microprocessor operations stack since power was last applied TYPICAL COMMAND 0100CS
55. is backward compatible and works in the standard mode with typical parts per million resolution Nano resolution is achieved by sub sampling the pressure at a much higher rate typically 8 kHz and applying digital signal processing techniques Because of the much higher processing requirements more input power is required In general the nano resolution feature is only useful if pressure is stable enough over effective sampling period and the data acquisition system can handle additional digits The practical bandwidth of interest is in the infrasound and deep infrasound 10 to 0 001 Hz The digital signal processing technique utilizes the infinite impulse response IIR filter available with firmware R5 10 and later It consists of a 5 stage digital low pass filter acting on the sub samples It filters all frequencies with a roll off of 100 dB decade above a user selectable cutoff frequency It is an effective anti aliasing filter The inherent resolution depends on the cutoff frequency and not on the sampling period Typically the sampling rate is set at the Nyquist limit or twice the cutoff frequency NANO RESOLUTION FEATURES amp FUNCTIONS 8 1 ENABLING NANO RESOLUTION Nano resolution can be enabled and disabled by the XM serial command XM Set or read the resolution mode Range 0 Standard Resolution backward compatible 1 Nano resolution IIR Filter Default 0 Typical set command 0100EW 0100XM 1 Typical set response
56. lue gt P lt SN gt lt CR gt lt LF gt To change the header string to PASHS use the following NH NMEA Header command Command 0100EW 0100NH PASHS Response 0001NH PASHS The P9 response will now look like this PASHS XDR P lt Pres Value gt B lt SN gt C lt Temp value gt C lt SN gt H lt Hum value gt P lt SN gt lt CR gt lt LF gt Remember to add a comma to the end of the string if a comma is to appear before XDR The maximum string length is 7 characters Unused characters to be null not spaces ASCII characters 32 through 90 are valid except and TT or Al Read an external temperature sensor measurement in degrees Celsius Command 0100TT 0100A1 Response 0001 or 0001 0001 or 0001 for negative temperature values NOTE See MD command for fan status indication RH or A2 Read an external humidity sensor measurement in percent Command 0100RH 0100A2 Response 0001 or 0001 N1 Read raw analog to digital converter value for the temperature input Command 0100N1 Response 0001 H MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 9 N2 AR ZI Z2 MI Read raw analog to digital converter value for the humidity input Command 0100N2 Response 0001 H Read or set current analog resolution If AR 0 then output resolution is 0 1 degrees C 0 1 RH If AR 1 then output resolution is 0 01 degrees C 0 1
57. mum samples rates may be calculated for all models using the equation below where sensor periods are in microseconds Resolution f s 1 150 PR Pper Pressure Sensor PR Pper sec Integration Time 10 000 P2 command 10 000 Max Samples s PR Pper P4 Command 10 000 Max Sample s PR Pper TR 1 Tper At very short counter integration times sample rates are limited by microprocessor speed or baud rate rather than by integration time RESOLUTION INTEGRATION TIME amp SAMPLING SPEED 9 2 10 HIGH SPEED SAMPLING High speed sampling requires special attention to baud rate sample integration time and programming Assuming a typical message at high speed of 14 characters the maximum number of data values second at various baud rates is tabulated below BAUD RATE MAXIMUM SAMPLES SEC 300 2 1 600 4 3 1200 8 6 2400 17 0 4800 34 0 9600 69 0 19200 137 0 Thus high baud rates must be used for fast sampling Assuming that the baud rate and computer are fast enough the transmitter operating parameters which affect speed are the PR command and the sampling mode chosen For large values of PR the sample rate is limited by the counter integration time As PR is made smaller the sample rate increases Somewhere around 40 samples s the speed begins to be limited by the microprocessor calculation speed Generally the continuous send commands are somewhat faster than repeated individual commands because counti
58. nd reading get next count and loop until stopped TYPICAL COMMAND 0100Q2 TYPICAL REPLY 00015 812345 00015 812346 00015 812347 etc Sample and send one temperature in degrees C ACTION Start temperature count read count when done correct count for timebase and integration time compute temperature and send await next command TYPICAL COMMAND 0100Q3 TYPICAL REPLY 000122 1234 Continuously sample and send temperature ACTION Start temperature count read count when done restart count correct for timebase and integration time compute temperature and send wait for next count and loop until stopped TYPICAL COMMAND 0100Q4 TYPICAL REPLY 000122 1234 000122 1235 000122 1234 etc Sample and hold one temperature ACTION Same as Q3 except save reading and await DB command TYPICAL COMMAND 0100Q5 TYPICAL REPLY None until DB or DS command received COMMAND DESCRIPTIONS 6 3 06 DB DS Sample and hold one temperature period ACTION Same as Q1 except save reading and await DB or DS command TYPICAL COMMAND 0100Q6 TYPICAL REPLY None until DB or DS command received Dump buffer Send reading being stored ACTION Send reading saved during P5 P6 Q5 or Q6 command The DB command must be the next command addressed to the transmitter after a sample and hold If the DB command arrives before the sample is ready data are sent when ready TYPICAL COMMAND 0100DB TYPICAL REPLY 0001555
59. ng of the next sample proceeds while the previous one is being calculated HIGH SPEED SAMPLING 10 1 Two special burst sampling procedures can be used to obtain faster sample rates The P7 command allows up to about 90 samples s With this command temperature is measured once and that value is used for the temperature correction of all subsequent pressure measurements This is faster because time is saved by not having to count the temperature signal on every reading and because many of the temperature correction terms are calculated only once and then stored This command is intended for relatively short bursts If internal sensor temperature changes rapidly during the data run more than about 0 3 degrees C small errors will be introduced in the data because all temperature corrections are being made with the temperature measured at the start of the run In more rapidly changing thermal environments errors can be minimized by reissuing the P7 command periodically to force an update of the temperature being used The fastest sampling method uses period measurement commands Q1 and P2 and can achieve sample rates up to 135 samples s The transmitter reports period data directly and calculation of pressure is done in the user s computer Typically the user takes a single temperature period with command Q1 a burst of pressure periods with command P2 and then another temperature with Q1 The user interpolates the before and after temperature p
60. odels taring can be initiated only by a mechanical switch closure The ZS command returns value 0 or 1 depending on whether the zero set switch is off or on TYPICAL COMMAND TYPICAL REPLY TYPICAL COMMAND TYPICAL REPLY TYPICAL COMMAND TYPICAL REPLY TYPICAL COMMAND TYPICAL REPLY ZV Zero value 0100ZS 0001ZS 0 No taring 0100EW 0100ZS 1 Initiate taring 0001ZS 1 0100P3 Measure pressure 0001 0000 0100ZS 0001ZS 2 ACTION Reads or sets the pressure value that is subtracted from reading when taring is activated ZV is stored in RAM Users may force a specific value to be used if taring is presently in effect ZS 2 by setting ZV to any desired value Note however that if taring is subsequently requested either by a ZS 1 command or by contact closure a new ZV will overwrite the value you have set Changing the value of ZV by software command requires an EW command even though ZV is stored in RAM rather than in EEPROM The value of ZV is lost if power is turned off COMMAND DESCRIPTIONS 6 14 Operation is similar on the Model 740 and Model 760 except taring can only be initiated by mechanical switch closure and a command to set ZV to a specific value will be interpreted as being in psi regardless of the pressure units selected Commands to read the value of ZV show it in whatever pressure units are selected TYPICAL COMMAND 01000ZV TYPICAL REPLY 0001ZV 14 592 Z
61. operation are the same in all configurations The digital board has a microprocessor controlled counter and RS 232 port The microprocessor operating program is stored in permanent memory EPROM User controllable parameters are stored in user writable memory EEPROM The user interacts with the unit via the two way RS 232 interface The pressure transducer provides two continuous frequency output signals one corresponds to the pressure and the other to sensor internal temperature The digital board uses these two signals to calculate fully temperature compensated pressure The equations used are described in Appendix E The microprocessor monitors incoming commands from the computer When a sampling command is received the microprocessor selects the appropriate frequency signal source and makes a period measurement using a 14 74 MHz timebase counter The counter integration time is user selectable Some commands require measurements of both temperature and pressure signals In that case the temperature period is measured first followed by the pressure period When the period measurement is completed the microprocessor makes the appropriate calculations and loads the data onto the RS 232 bus HARDWARE DESCRIPTION 2 1 3 SPECIFICATIONS See MET3 3A section for specifications for these products NOTE 710 Display is only supported by older instruments with display clock and display data outputs RS 232 BUS Baud Rates User selectable
62. ount of Loctite 609 to the screw Torque the screw to 25 ft lbs to secure the assembly Prior to re installation of the pressure port it is recommended that the Teflon pipe tape on the male thread be removed and replaced with at least three wraps of fresh tape Carefully re mate the barometer port to the main body of the instrument and screw the two together HAND TIGHT Do not over tighten these threads Over tightening could cause damage to the threads and impede future disassembly Do not permit water to enter the exposed port on the electronics enclosure Cleaning the Barometer Condensation Drain The condensation drain is the brass fitting with a sintered stainless steel screen located on the underside of the upper body adjacent to the electrical connector Inspect the screen for contamination and if necessary clean the screen with a nylon brush and distilled water MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 16 lower vert all MET3A Cleaning the Temperature Humidity Sensor You may visually check the aspirated portion of the enclosure for contamination Prior to any cleaning activity turn off the power The screens are intended to prevent large particles from entering the system Clean these with a nylon brush It is necessary to remove the lower portion of the MET3A aspirated temperature
63. r Paroscientific products EW Permits the modification of a parameter value It must be sent with any command that modifies a parameter value Example 1 To change a Z1 coefficient value Command 0100EW 0100Z1 4 Response 0001Z1 Example 2 To change a G2 coefficient value Command 0100EW 0100G2 Response 0001G2 P9 Description Read unified data word containing Pressure Temperature and Humidity measurement values based on the NMEA specification NOTE This command only functions with single devices and cannot be used in a serial loop The instrument only responds to P9 commands when the engineering units are set to Bar UN 3 Command 0100P9 Typical Response WIXDR P lt P gt B lt SN gt C lt T gt C lt SN gt H lt H gt P lt SN gt lt CR gt lt LF gt Pressure Temperature Humidity Transducer Field Units Pressure P B Bar Temperature C C Celsius Humidity H P Percent lt SN gt Transducer Serial Number Typically DQ MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 7 LI Provides pressure temperature and RH measurement data in a unified fixed field length format This format simplifies the parsing of the individual measurement values and enhances the MET3 MET3A s compatibility with commercial data loggers such as the Handar 555 Data Collection Platform NOTE The LI command is only supported by MET3 MET3A firmware revision 1 02 and above The L1 command only func
64. r response they produce The reason is that each transmitter passes on the command to the next transmitter in the loop before acting on the command Example COMMAND 9900P1 REPLY 9900P1 000128 12345 SUPPLEMENTAL INFORMATION 14 8 5 GARBAGE CHARACTERS IN INPUT BUFFER The computer receive buffer should be cleared after applying power to the transmitter Turning on power to the transmitter causes the output lines to go from zero to defined voltage levels This produces a garbage character in the input buffer of some computers Alternatively when getting data from the input buffer throw away leading characters until you come to an All legitimate transmitter replies begin with 6 CLEAR TRANSMITTER At the start of all programs send a command 9900VR is a good choice to terminate whatever the transmitter may have been doing and then clear out the RS 232 receive buffer on your computer Remember that when a continuous send command is given the transmitter continues to send data even after the computer is halted If you restart the program the transmitter will still be sending data whether it is expected or not 7 REWRITING EEPROM Do not routinely rewrite EEPROM at the start of every program Check the values and change only what needs changing A given register in EEPROM is guaranteed only for 10 000 rewrites 8 WRITING CONTROL PARAMETERS IN EEPROM When writing control parameters in EEPROM e g BR PR UN e
65. racters in some messages Characters must be upper case Reply messages may substitute data for the cc characters Each message line is terminated by a carriage return lt cr gt and a line feed lt If gt Undefined commands are absorbed A command arriving before a previous command is completed cancels the previous command A typical message from the PC to transmitter 1 asking for pressure 0100P3 lt cr gt lt lf gt A typical reply from the transmitter to the PC 000114 573 lt cr gt lt lf gt HOW TO GET STARTED 4 5 SET UP COMMANDS Before a computer can talk to the transmitter its baud rate BR parity PT and identification ID number must be known Transmitters are normally shipped set to BR 9600 PT N and ID 1 Users may change these parameters but should record the new values If the baud rate and parity of a transmitter are not known the computer will have to search all values to reestablish communication The command PR sets the counter integration time in multiples of about 0 003 seconds This command determines the Pressure Resolution The transmitters are shipped set to PR 238 which gives a pressure resolution of about 1 ppm and a counter integration time of about 0 7 seconds Users may select the value best suited for their applications Larger values give higher resolution but take longer Once these parameters are set you are ready to take data The transmitter retains these parameter
66. rate Must be global command Locks baud rate and parity to prevent change Must be global command Auto number transmitters in a loop Must be global command Sets transmitter parity Must be global Enable EEPROM write for one command NOT SUPPORTED FOR TRANMITTERS AND DEPTH SENSORS SHIPPED WITH FIRMWARE VERSIONS R1 00 R2 01 PARAMETER IS READ ONLY FIXED AT 8 DATA BITS NO PARITY AND 1 STOP BIT IN TRANSMITTERS AND DEPTH SENSORS SHIPPED AFTER 10 1 01 FIRMWARE VERSION R1 00 AND LATER SUPPLEMENTAL INFORMATION 14 15 REMAINING COMMANDS CANNOT BE GLOBAL PI Setor read the pressure measurement integration time TI Set or read the temperature measurement integration time PR Read enter pressure resolution TR Read enter temperature resolution UN Read enter choice of pressure units 0 user defined 3 bar 6 in Hg 1 psi 4 kPa 7 Torr or mm Hg 2 mbar or hPa 5 MPa 8 m H20 UF Read enter user definable units MD Reads or sets power up mode TARE AND OVERPRESSURE COMMANDS BP Sound overpressure beeper OP Read enter the overpressure alarm setting ZS Read the position of the zero set switch ZV Zero value Read the zero offset value ZL Zero lock Enable or disable taring TIME REFERENCE STAMP COMMAND TS Enables and disables the time reference stamp feature SPECIAL DIAGNOSTIC COMMANDS MC Memory check Checks program PROM CS Check stack of microprocessor CT Check counter timebase CX Check crystal
67. rate at a value compatible with the modem TYPICAL COMMAND 9900BL TYPICAL REPLY 0100BL 0 not locked 9900BL TYPICAL COMMAND 9900EW 9900BL 1 lock all TYPICAL REPLY 9900EW 0001BL 1 9900BL 1 Auto number transmitters in a loop Must be a global command ACTION Causes units to auto number around a loop Command begins at the PC with 9900ID The first unit sees that the previous unit was 00 and numbers itself 01 and stores the value in EEPROM Unit sends out 9901ID which causes the next unit to number itself 02 The PC eventually will receive the message 99nnID where nn is the number of units in the loop TYPICAL COMMAND 9900ID TYPICAL REPLY 9901ID COMMAND DESCRIPTIONS 6 7 PT Sets transmitter parity Must be a global 99 command Parameter PT controls parity sent by the transmitter Parity on incoming messages is ignored Choices are N 8 data bits no parity one stop bit E 7 data bits even parity one stop bit 0 7 data bits odd parity one stop bit TYPICAL COMMAND 9900PT N Set to 8 data bits no parity TYPICAL REPLY 9900PT N VR Read software version May be a global command ACTION Unit sends the software version number stored in the program EPROM TYPICAL COMMAND 0100VR TYPICAL REPLY 0001VR 01 00 EW Enable EEPROM write for one command May be a global command ACTION Set flag allowing EEPROM write on next command Flag is cleared after next command is received TYP
68. re count read count when done calculate period using timebase and integration time send reading await next command TYPICAL COMMAND 0100P1 TYPICAL REPLY 000129 12345 Continuously sample and send pressure signal periods ACTION Start pressure count read count when done restart count calculate period using timebase and integration time send reading read next count when available and loop until stopped TYPICAL COMMAND 0100P2 TYPICAL REPLY 000129 12345 000129 12346 000129 12344 etc Sample and send one compensated pressure ACTION Start temperature count read count when done start pressure count correct temperature count for timebase and integration time compute temperature compensated pressure coefficients read pressure count when done correct pressure count for timebase and integration time calculate pressure send reading await next command TYPICAL COMMAND 0100P3 TYPICAL REPLY 0001555 444 COMMAND DESCRIPTIONS 6 1 P4 P5 P6 P7 COMMAND DESCRIPTIONS 6 2 Continuously sample and send compensated pressure ACTION Start temperature count read count when done start pressure count correct temperature count for timebase and integration time compute temperature compensated pressure coefficients read pressure count when done restart temperature count correct pressure count for timebase and integration time calculate pressure send reading loop until stopped TYPICAL COMMAND 0
69. s in EEPROM even if turned off The sample programs on the following pages will help you to get started STANDARD CONFIGURATION SETUP The intelligent devices are shipped with a data sheet of the configuration setup It shows the settings of all the configuration parameters and calibration coefficients The user should safeguard this data sheet for future reference SAMPLE PROGRAMS For programming examples in Visual Basic and Visual C see the website http www paroscientific com under the software menu option HOW TO GET STARTED 4 6 5 COMMAND LIST SAMPLE COMMANDS May be used as global commands P1 P2 P3 P4 P5 P6 P7 Q1 Q2 Q3 Q4 Q5 Q6 DB DS Sample and send one pressure sensor period Continuously sample and send pressure periods Sample and send one pressure Continuously sample and send pressure Sample and hold one pressure Sample and hold one pressure period Burst and sample pressure read temperature once then continuously send pressure compensated using original temperature Sample and send one temperature period Continuously sample and send temperature periods Sample and send one temperature Continuously sample and send temperature Sample and hold one temperature Sample and hold one temperature period Dump buffer Sends values being stored Dump sequential Sends stored values in sequential order CONFIGURATION CONTROL COMMANDS BR BL ID PT EW Enter baud rate Must b
70. send mode but because exact integration time varies from unit to unit the data can come back in a chaotic order and must be sorted out according to address 6 The wiring diagram for loop interconnections is shown on the next page Pin connections shown are for 9 pin D connectors but an analogous system could be used for any connector type Note that only 4 wire cabling is required or only 3 wire cabling if transmitter power is not bussed The terminator block after the last transmitter wraps the transmit data line back to the computer input With this arrangement any transmitter can be removed from the loop either by unplugging the transmitter and replacing it with a terminator jumper or by removing the y adapter and plugging the two extension cables together MULTIPLE TRANSMITTERS ON THE RS 232 BUS 11 2 SERIAL LOOP CONNECTIONS Pin outs are shown for transmitters and interface boards with 9 pin connectors ANSMITTER ECT SCRIPTION E T F L LA LA E ABLE TERMINAT OR LAST TI SMITTER CC H TRAD LU i LU a EI Sr 2 E GEES S Lu f FEE IE 55 N k Lo c leaf fi 3835 GE LEG z256 va So LE MULTIPLE TRANSMITTERS ON THE RS 232 BUS 11 3 2 MULTIPLEXER SYSTEM For high security applications with a large number of transmit
71. sponse 0001PR 200 NOTE Whenever the value of PR is changed TR is automatically updated with the value of PR times 4 NOTE Whenever the value of PR is changed PI is automatically updated to reflect the equivalent pressure integration time Set or read temperature measurement integration time Units None Range 1 to 65535 integer values only Default 952 Typical set command 0100EW 0100TR 800 Typical set response 0001TR 800 Typical read command 0100TR Typical read response 0001TR 800 NOTE Changing TR has no effect on PR NOTE Whenever the value of TR is changed II is automatically updated to reflect the equivalent temperature integration time COMMAND DESCRIPTIONS 6 6 CONFIGURATION CONTROL COMMANDS BR BL ID Enter baud rate Must be a global command CAUTION Think carefully before changing the baud rate ACTION Sets baud rate Does not require an EW command Choices are 150 300 600 1200 2400 4800 9600 19200 baud TYPICAL COMMAND 9900BR 2400 set BR 2400 TYPICAL REPLY OOOOBR 2400 NOTE When the baud rate is changed the confirming reply is sent at the original baud rate but all subseguent commands should be at the new baud rate Baud lock Must be global command ACTION Locks or unlocks baud rate and parity to prevent accidentally changing them BL 0 is unlocked and allows values to be changed BL 1 is locked When modems are used it is wise to lock the baud
72. talled units Ensuring that the MET3 MET3A package remains clean and debris free will improve the overall performance The electronics package is environmentally sealed requires no cleaning or maintenance and contains no customer serviceable parts Opening of the sealed enclosure may affect the Paroscientific warranty MET3 Maintenance Procedures Periodic cleaning of the solar shield and barometer port inlet is the only recommended physical maintenance for the unit The cleaning procedure consists of removing the solar shield and barometer port assembly cleaning the port inlet and re installing the assembly Solar Shield and Barometer Port Removal The solar shield and barometer port assembly has been designed for easy removal so that the user may clean the temperature humidity probe Using a 3 16 Allen wrench dismount the shield port assembly by removing the two socket head cap screws that attach the assembly to the electronics enclosure Carefully lift the shield assembly upwards to expose the probe Cleaning the Temperature Humidity Probes Remove the heat sink from the RH probe and clean the sensor screen with distilled water Sensors that become heavily contaminated in field use can be cleaned off with a soft brush and distilled water Replace the heat sink before re assembling MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 14 Remove Assembly Lift Vertically BAROMETER PRESSURE PORT Remove Remove
73. tc always wait for the reply before sending other commands addressed to the same transmitter The sensor ignores commands addressed to it until its EEPROM write is completed about 0 1 seconds Commands for other transmitters are relayed properly No wait is required when reading EEPROM SUPPLEMENTAL INFORMATION 14 9 APPENDIX D SAMPLING COMMANDS APPROX MAX SAMPLES PER SEC STANDARD SAMPLING COMMANDS PRESSURE P3 Single sample and send 30 P4 Continuous sample and send 50 PS Single sample and hold 30 DB Send stored value TEMPERATURE Q3 Single sample and send 45 Q4 Continuous sample and send 100 Q5 Single sample and hold 45 DB Send stored value PERIOD SAMPLING COMMANDS P PERIOD P1 Single sample and send 50 P2 Continuous sample and send 135 P6 Single sample and hold 50 DB Send stored value T PERIOD Q1 Single sample and send 58 Q2 Continuous sample and send 145 Q6 Single sample and hold 55 DB Send stored value BURST SAMPLING COMMANDS PRESSURE P7 Continuous sample and send 90 BURST PERIOD Q1 P2 Q1 Command sequence 130 BURST SUPPLEMENTAL INFORMATION 14 10 APPENDIX E CALCULATION OF PRESSURE The transmitter calculates temperature and pressure from period measurements of two frequency signals The equations used in the calculations are given below Temperature Y U Y5U2 Y3U3 C P C 1 T92 Tau 1 D 1 T92 Tau2 psi where Tau pressure period in microseconds U temp period Ug microseconds C C
74. ters it may be desirable to use a relay multiplexer as a switching hub to select separate data lines running out to the individual transmitters or clusters of transmitters in the system Loss of any one data line through accident or failure will affect only the cluster on that data line COMPUTER N DATA LINE 1 gt x lt S DATA LINE 2 lt Mb ETC 2 3 MULTIPLE RS 232 PORTS Transmitters or clusters of transmitters can be assigned to individual serial ports This approach can provide simultaneous very high speed sampling of large numbers of transmitters Expansion cards are available for PCs which provide up to 32 serial ports per card Some versions with on board IO processors and dual ported RAM can transfer data at 19200 baud to and from all ports simultaneously These boards can provide data at 100 samples per second from each of 32 transmitters This approach also offers good system integrity in the sense that failure of any transducer or cable does not affect the rest of the system MULTIPLE TRANSMITTERS ON THE RS 232 BUS 11 4 12 TARING AND OVERPRESSURE WARNING Taring and overpressure warning capabilities are supported in slightly different ways on 9 pin version of the Intelligent Transmitter RS 232C Serial Interface Board and Model 760 OVERPRESSURE WARNIN
75. the computer transmitted data back to the computer receive line Then by looking at the data in the receive buffer you can find out exactly what was sent l MESSAGES NOT COMING BACK FROM TRANSMITTER If you cannot seem to get any messages back from the transmitter first make sure that the baud rate is correct and the communications channel is set up for 8 data bits no parity 1 stop bit Then try a global command 9900VR to make sure the ID is correct If that does not work the computer may be waiting for handshake signals CTS DSR CD which the transmitter does not provide On the IBM PC and most other computers you can choose to ignore these signals when you open up the communications channel See the programming examples in the text If your computer insists on these signals you can provide them by jumpering back the DTR signals to the CTS DSR and CD pins on the same connector See APPENDIX B for common pin outs UNREQUESTED CONTINUOUS DATA If the transmitter sends data continuously without being asked whenever powered up check the setting of the MD parameter REPLY DELAY Almost all commands generate a reply but for long integration times some replies may take several seconds Exceptions a An undefined garbage command addressed to a specific sensor will be absorbed Example 0100ZQ b Sample and hold commands generate no response GLOBAL COMMAND ECHO Global commands echo back the command in addition to whateve
76. tions with single devices and cannot be used in a serial loop Typical command 0100L1 Typical response 098765 00 995874 23 45 045 7 1 lt cr gt lt lf gt The L1 data record is formatted as follows Character position 1 based Start character asterisk 1 Serial Number field 2 7 Comma Pressure field Temperature field 20 25 Comma 26 RH field 27 32 Fan Status field 34 Termination characters 35 36 Pressure temperature and RH values are padded with leading and trailing zeroes as required to maintain a fixed field width The serial number field is padded with leading zeroes as required to maintain a fixed field width The decimal point always appears in the same character position within each field The pressure temperature and RH fields have explicit signs If the MET3A fan is operational a 1 is returned in the Fan Status field otherwise a 0 is returned To determine which firmware version is loaded activate the VR command VR returns the firmware version number stored in the program EPROM Example Command 0100VR Response 0001VR 01 01 MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 8 NH Read or set NMEA header used in the P9 command response By default the NH NMEA Header string is set to produce the generic NMEA header WI The default P9 output looks like this WIXDR P lt Pres Value gt B lt SN gt C lt Temp value gt C lt SN gt H lt Hum va
77. top bit Then try a global command 9900VR to make sure the ID is correct If that does not work the computer may be waiting for handshake signals CTS DSR CD which the transmitter does not provide On the IBM PC and most other computers you can choose to ignore these signals when you open up the communications channel See the programming examples in the text If your computer insists on these signals you can provide them by jumpering back the DTR signal to the CTS DSR and CD pins on the same connector SUPPLEMENTAL INFORMATION 14 2 APPENDIX B CONNECTOR PIN ASSIGNMENTS 9 PIN D CONNECTOR Models Intelligent Transmitter RS 232 Digital Barometer Model 760 Portable Field Standard Pin outs PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9 Connector Diagram CONNECTOR PART NO MATING CONNECTOR CHASSIS GROUND DATA TO COMPUTER DATA FROM COMPUTER not used SIGNAL AND POWER GROUND DISPLAY CLOCK Model 760 Only not used DISPLAY DATA Model 760 Only POWER SEE SCD Type DE9 S Type DE9 P SUPPLEMENTAL INFORMATION 14 3 9 PIN BENDIX MS CONNECTOR Models Model PS 2 Water Level Sensor RS 232 Pin outs PINA CHASSIS GROUND PIN B DATA TO COMPUTER PINC DATA FROM COMPUTER PIN D not used PINE SIGNAL AND POWER GROUND PIN F DISPLAY CLOCK PIN G not used PIN H DISPLAY DATA PINJ POWER SEE SCD Connector Diagram CONNECTOR PART NO MS3102A22 20P MATING CONNECTOR MS3106A22 20S
78. um and that the communication pin outs to the MET3 MET3A connector are correct PIN 1 NO CONNECT O AK Noi O CO PIN 2 BLACK DATA TO COMPUTER NO PIN 6 WHIT ae fy ENO n ml PIN 3 BROWN DATA FROM COMPUTER PIN 4 NO CONNECT N PIN 4 WHITE PIN 5 WHITE 3ROUNI DATA IN PIN 3 BROWN lt PIN 6 NO CONNECT dp EIN AD PIN 7 NO CONNECT 7 SIN aR PIN 8 NO CONNECT PIN 9 RED POWEI SHELL HELL FI Earth I FISCHER 104 EE LPH OH b Ka JRS NG H D LAST THREE DIGITS OF PART NUMBEI _ DEFINES CABLE LENGTH IN METERS EXAMPLE 2379 030 30 METERS OF CABLE CONNECTOR W W FISCHER S104A065 130 LENGTH TOLERANCE TO 10 METERS 15 M CONNECTOF CLAMP ASSY W W FISCHER E3104 2 7 7 8 PLUS METERS 5 M IC W METALIZED SHELL INDEXING KE x HDD DDT FRONT VIEW OF REAR VIEW OF SONNECTOR PIN QUTS ONNECTOR PIN OUTS MET3 MET3A INSTALLATION OPERATION amp MAINTENANCE 13 13 MAINTENANCE The MET3 MET3A Meteorological Measurement System is a highly accurate reliable instrument that is intended to operate for a long period of time without need of maintenance or calibration For critical installations yearly checks of temperature humidity and barometric pressure may be appropriate Transfer standards such as the Paroscientific Model 760 16B for pressure or a newly calibrated MET3 MET3A unit would be suitable for field verification of ins

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Digiquartz® Programming and Operations Manual