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Accubar SDI-12 Barometric Pressure Sensor Operations & Maintenance Manual Rev-B 30 Nov 2017

pg. 40

Appendix A -- Introduction to Pressure Measurement

TYPES OF PRESSURE MEASUREMENTS

ABSOLUTE (PSIA)

Pressure is measured with respect to an absolute vacuum.

DIFFERENTIAL (PSID)

Pressure is measured with respect to a second pressure port.

GAUGE (PSIG)

Pressure is measured with respect to atmospheric pressure. Same as a differential pressure sensor with
the second port open to the atmosphere.

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Summary of Contents for Accubar 5600-0120-3

Page 1: ...Accubar SDI 12 Barometric Pressure Sensor 5600 0120 3 OPERATIONS MAINTENANCE MANUAL Part No 8800 1191 Revision B 30 Nov 2017...

Page 2: ...ersion Control Version Date Author Change Description 1 01 March 2014 Lewis Initial Release Rev A Sept 2014 Robin Ovington Formatting changes Rev B Nov 2017 Jerry Added additional operational and spec...

Page 3: ...nsors 10 Improved data integrity checking 11 Making a Non Concurrent Measurement M command 11 Making a Concurrent Measurement C command 12 Making a Non Concurrent Measurement with CRC 16 MC command 14...

Page 4: ...llation 34 7 Calibration 36 Factory Calibration 36 Metrology Lab Calibration 36 8 Troubleshooting and Maintenance 38 Troubleshooting 38 Maintenance 38 9 Specifications for 5600 0120 3 Barometric ACCUB...

Page 5: ...age range of 8 to 16 VDC 2 Quick Start The Barometer comes prepared with a short cable to connect to your SDI 12 Data Recorder Black Ground Red Power 8 16VDC White SDI 12 Data The unit comes configure...

Page 6: ...RO 12 120120002B1 01 which shows a response from address 0 that the unit supports SDI 12 specification 1 3 and therefore 1 2 1 1 and 1 0 that the manufacturer is SUTRON and that the model is a BARO 1...

Page 7: ...e command body and the responses are shown as a combination of upper and lower case letters The upper case letters are the fixed portions of the command and the lower case letters are the variables or...

Page 8: ...age in response to the command if the command was recognized The message will be 00011 which is explained in the Command Reference If you do not get this message try the command again to ensure there...

Page 9: ...AR and make sure you use the proper address for the sensor Commands Overview The commands to set up and operate the ACCUBAR are those defined by the SDI specifications 1 0 plus some extended commands...

Page 10: ...Only one sensor could be accessed at a time and a maximum of nine parameters could be returned With version 1 2 of the specification concurrent measurements were defined With a concurrent measurement...

Page 11: ...hem when collecting data from this sensor in order to benefit from the increased noise immunity Making a Non Concurrent Measurement M command The command to tell the ACCUBAR to make a measurement with...

Page 12: ...ro then one of the following values of u will be returned 10 units are mB station elevation offset 11 units are Hg station elevation offset 12 units are kPa station elevation offset 13 units are mmHg...

Page 13: ...format of a polarity sign or followed by up to seven digits including a decimal point The u indicates the units of the measurement When u is 0 the value has units of mB hPa When u is 1 the units are...

Page 14: ...cted to issue this command and automatically handle the reply to collect data You can also issue the command yourself In reply the ACCUBAR will respond with attt2 acknowledging it is address a and ind...

Page 15: ...9 user units with non zero station elevation offset mB elevation offset user scale user offset set by XE or XS Set by XUU In most cases you will not set up the recorder to store this units identifier...

Page 16: ...en u is 1 the units are inches of mercury Hg When u is 9 the units depend on a user entered slope and offset u can also take on additional values if a station elevation offset has been entered The fol...

Page 17: ...the temperature and the units The units will be 0 for Celsius and 1 for Fahrenheit aM3 aC3 aMC3 aCC3 measure user scale user offset elevation offset Use this if you want to view the user entered value...

Page 18: ...e output to be in the default units mB with a resolution of 2 decimal places The second parameter 2 in the example is optional If omitted the resolution is not changed Setting User Units If you want t...

Page 19: ...asurement to compute atmospheric pressure at sea level aXEou where o is adjustment value with units u u can have units 0 mB hPa 1 Hg 2 kPa 3 mmHg 4 Atm 5 psia or 9 user units For example the command a...

Page 20: ...initial calibration before the ACCUBAR starts the pressure measurement averaging With the high speed mode the overhead drops to 0 8 seconds Note It is recommended that a measurement be manually initia...

Page 21: ...ng configuration aXFD where a is the address character XFD is the extended command to reset the unit to the factory default configuration Note The address is not changed Note It is recommended that th...

Page 22: ...given otherwise there will be a communications collision when all units respond Ab Set SDI 12 address aAb b new SDI 12 address Example 5A9 set address 5 to address 9 the address was previously set to...

Page 23: ...nd u is the units 0 Celsius and 1 Fahrenheit Use the XUT command to set the units C3 Request User Scale User Offset and Field Calibration Offset aC3 aD0 a00003 000 is the time in seconds until the mea...

Page 24: ...llected apt where p is the pressure in mB and t is the temperature in degrees Celsius CC Request Default Concurrent Pressure Measurement with CRC 16 aCC aD0 attt02 ttt is the time in seconds until the...

Page 25: ...the measurement is ready and 2 is the number of values that can be collected asoC where s is the scale calibration o is the offset calibration mB and C is the CRC CC6 Request Concurrent Temperature a...

Page 26: ...mB Note If the ACCUBAR only returns the address and no data values that indicates that there is no data available A measurement command has not been issued OR the command was aborted by sending a new...

Page 27: ...y and 2 is the number of values that can be collected a service request atu where t is the temperature and u is the units 0 Celsius and 1 Fahrenheit Use the XUT command to set the units M3 Request Use...

Page 28: ...and Temperature Measurement aM7 aD0 attt2 ttt is the time in seconds until the measurement is ready and 2 is the number of values that can be collected a service request apt where p is the pressure in...

Page 29: ...the 3 character CRC Use the XUT command to set the units MC3 Request User Scale User Offset and Field Calibration Offset with CRC 16 aMC3 aD0 a0003 000 is the time in seconds until the measurement is...

Page 30: ...and to set the pressure units MC7 Request factory calibration Pressure and Temperature Measurement with CRC 16 aMC7 aD0 attt02 ttt is the time in seconds until the measurement is ready and 02 is the n...

Page 31: ...d issued to the new address after the XAD command will return the new address XE Set Elevation offset aXExu where x is the pressure offset u indicates the units of the offset 0 mB hPa 1 Hg 2 kPa 3 mmH...

Page 32: ...insure this reading attt1 where ttt indicates the command will be complete in ttt seconds and 1 indicates one value can be collected Note a D0 command issued after XS is complete will display the new...

Page 33: ...ected and the number of digits right of the decimal point Note Current settings can be queried by issuing the aXUP Command followed by the aD0 Command XUT Set temperature units aXUTn n 0 for Celsius n...

Page 34: ...dition the unit is supplied with optional external mounting feet The external mounting feet support 8 10 12 M4 or M5 hardware The ACCUBAR barometric pressure fitting is a hose barb for a 3 16 ID tubin...

Page 35: ...Accubar SDI 12 Barometric Pressure Sensor Operations Maintenance Manual Rev B 30 Nov 2017 pg 35 Figure 2 Using External R feet Figure 3 Using External L Feet...

Page 36: ...meters Most metrology labs would not have the capabilities to provide a calibration over temperature and pressure To accurately calibrate an ACCUBAR requires a reference accuracy better than 0 1 mB id...

Page 37: ...ntered by the XC command calibration scale is entered by the XC command field offset is entered by the XE or XS commands units scale and units offset are set by the combination of the XUP and XUU comm...

Page 38: ...sed Garbled data Multiple sensors set to the same address check address settings of all SDI sensors Remove all other sensors from the recorder and add them one at a time Communication is defined to be...

Page 39: ...racy 0 4 0 3 0 2 mB hPa 20C depending on version An additional 0 1 mB over the temperature range Resolution Better than 0 01mB Averaging Time 0 to 120 seconds user selectable Supply Voltage 8 to 16VDC...

Page 40: ...rement TYPES OF PRESSURE MEASUREMENTS ABSOLUTE PSIA Pressure is measured with respect to an absolute vacuum DIFFERENTIAL PSID Pressure is measured with respect to a second pressure port GAUGE PSIG Pre...

Page 41: ...050 31 006 15 229 787 56 1 0363 989 1013 3 1013 3 29 921 14 696 760 00 1 0000 0 1000 1000 29 530 14 504 750 06 0 9869 364 950 950 28 053 13 779 712 56 0 9376 1773 900 900 26 577 13 053 675 05 0 8882 3...

Page 42: ...many times insufficient and ensures that the maximum error is achieved A best fit straight line decreases the maximum error by ensuring that the errors fall evenly on both sides Example of Linearity E...

Page 43: ...s errors Sometimes hysteresis is lumped in with other non repeatability errors ACCURACY Accuracy is a measure of how closely the sensor s output matches the true value of the parameter being sensed PR...

Page 44: ...mer Service Representatives routinely handle a wide variety of questions every day When equipment questions arise please feel free to contact me or one of Sutron s Customer Service Representatives We...

Page 45: ...CE OR OBLIGATIONS IN CONNECTION WITH THE DESIGN MANUFACTURE SALE DELIVERY AND OR USE OF GOODS AND OR SERVICES IN NO CIRCUMSTANCE INCLUDES ANY LIQUIDATED INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND...

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