Sentry Sample Sentry II Low Pressure - Page 33

Sentry Sample Sentry II 33
Figure 27. Channel Conguration on Sample Sentry II CPU Board
Terminals labeled V# are not used during calibration.
Calibrate each channel per Table 3 and instructions below.
Table 3. Channel Calibration Reference
Channel # Range Input P&ID Ref + –
Channel 1 4-20 mA Flow FT-1 1+ 1-
Channel 2 4-20 mA Outlet Pressure PT-2 2+ 2-
Channel 3 4-20 mA Inlet Pressure PT-1 3+ 3-
Channel 4 0-2.5 V Inlet Temp TE-2 T1 COM
Channel 5 0-2.5 V OutletTemp TE-1 T2 COM
Channel 6 0-2.5 V Cooling Temp TE-3 T3 COM
3. For calibration of channels 1–3 connect a calibrated milliamp supply to TB1 terminals
of the CPU board marked + and – for the appropriate channel. Input 4 mA. Press the
Enter key.
4. The controller is done calibrating the 4 mA when the Oset value stops adjusting and
the input value on the screen changes from 4 mA to 20 mA. Input 20 mA for selected
channel. Press the Enter key.
5. The controller is done calibrating the 20 mA when the Gain value stops adjusting.
Press the Enter screen to go to the channel selection screen.
6. Repeat steps 4-6 for remaining channels requiring 4-20 mA calibration.
7. For calibration of channels 4-6 connect a calibrated voltage supply to TB1 terminals of
the CPU board marked T1-T3 and COM for the appropriate channel.