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149-072011 Model 2002 Vacuum Gauge Page 30 of 38
8.2. Operation
The 4-20 mA output option board provides dual channel current output linearly proportional to the HPM
2002’s pressure reading. The first channel corresponds to the higher pressure range (0-1024 Torr). The
second channel corresponds to the lower pressure range (0-1000mTorr). The equations below give the
output currents for a given pressure:
Note that for both channels, the output is always between 4mA and 20mA. Specifically, when the pressure is
below 1 Torr, channel 1 current will be approaching 4mA. Also, when the pressure is above 1 Torr channel
2 current will be saturated at 20mA.
() ()()
⎟
⎠
⎞
⎜
⎝
⎛
+=
Torr
mA
TorrPmAchannelI
1024
16
*41
() ()()
⎟
⎠
⎞
⎜
⎝
⎛
+=
mTorr
mA
mTorrPmAchannelI
1000
16
*42