Instrutech The Hornet IGM402 User Manual page 41

Instruction Manual
-CG1 ANALOG CAL [Factory default = Factory Set]
This has been pre-set in the factory and is used to optimize the CG analog output calibration. It is
recommended that the user not make this adjustment unless the displayed pressure on the Hornet and the
resulting pressure recorded from the analog output do not match closely.
To perform the analog output calibration, connect the CG1 analog output to a high resolution voltmeter,
your system, PLC, etc. With CG1 exposed to atmosphere, press the ENTER key when in the IG ANALOG CAL
menu to see the next screen which allows you to calibrate the analog output. Use the UP or DOWN keys to
adjust the analog output to match the corresponding displayed pressure.
Example: After exposing CG1 to atmosphere and pressing the ENTER key in the IG ANALOG CAL menu the
next screen (analog output calibration screen) is displaying a pressure of 7.60E+02 Torr. Based on the
equation and table given in section 6.3 the expected analog output at 7.60E+02 Torr is 7.881 V. Use the
UP or DOWN keys to set the analog output to 7.881 V as recorded by your voltmeter. Alternatively, if the
CG1 analog output is used to display the CG1 pressure on your PLC or system display console, simply use the
UP or DOWN keys so that the CG1 pressure displayed by your PLC (atmospheric pressure) matches the CG1
pressure displayed in the analog output calibration screen. When done press the ENTER key to save the
settings. Note - As you adjust the analog output, the number you are changing in the analog output
calibration screen represents the millivolts offset from zero volts that is being used internally for the analog
output gain adjustment.
-CG2 ANALOG CAL [Factory default = Factory Set]
Same as CG1 ANALOG CAL above except for CG2.
InstruTech
IGM402 Hornet
Page 39