Series 979 ATVTransducer
Firmware Version Hot Cathode – FVHC ........................................... 28
Hardware Version MicroPirani – HV ..................................................28
Hardware Version Hot Cathode – HVHC ........................................... 28
Model – MD .....................................................................................28
Serial Number – SN .........................................................................29
Time On – TIM1, TIM2 ..................................................................... 29
Transducer Status – T ...................................................................... 29
Transducer Temperature – TEM1, TEM2 ........................................... 29
Pressure Measurement and Degas Commands ...................................... 30
Filament Power – FP ........................................................................ 30
Degas Power – DG ........................................................................... 30
Pressure Reading – PR1, PR2, PR3 ................................................30
Set Point Commands ............................................................................. 31
Set Point Value – SP1, SP2, SP3 .................................................... 31
Hysteresis Value – SH1, SH2, SH3 ................................................. 31
Set Point Direction – SD1, SD2, SD3 ..............................................31
Enable Set Point – EN1, EN2, EN3 ................................................. 32
Enable Control Set Point – ENC ......................................................32
Set Point Status – SS1, SS2, SS3 ..................................................32
Protect Set Point – PRO .................................................................. 32
Calibration Commands ...........................................................................33
Atmospheric Calibration – ATM ........................................................33
Vacuum Calibration – VAC ...............................................................33
Gas Type Calibration – GT ............................................................... 33
Gas Correction – GC ........................................................................ 34
Degassing the Sensor ............................................................. 35
Sensitivities Relative to Nitrogen ............................................ 36
Gas Correction Factor Table ...................................................................36
Analog Output ......................................................................... 37
Pressure to Voltage Table .................................................................. 38-40
Leak Detection ........................................................................ 41
Bakeout/Sensor Replacement................................................. 42
Bakeout ..................................................................................................42
Sensor Replacement .............................................................................. 43
Maintenance and Troubleshooting .......................................... 44
Maintenance and Troubleshooting Table ..................................................44
Cleaning the 979 ATV Transducer Case and Sensor Tube ....................... 45
Sensor Test Resistance Values Table .....................................................46
