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IMPORTANT: The gas sensor should be calibrated to the meter using the gas calibration
procedure on the previous page.
The user can calibrate or check the (milliampere) mA signal input. Enter the mA calibration mode from
the main operating display by pressing any push button, MNU, CAL, enter password (default 0000), SNS,
mA, and then select CH1 or CH2. This mode also sets the gas calibration to zero (4mA) and sensor
full-scale/SPAN (20mA).
NOTE: When this screen and sub screens are accessed, the sensor alarms are deactivated and
the analog outputs are forced to 4mA.
4mA: Press to set the 4mA point. This also sets the zero point in the gas calibration mode.
20mA: Press to set the 20mA point. This also sets the span point in the gas calibration mode to the full-
scale setting (CH1/2 MAX).
ENT: Press to permanently store the new calibration. ENT will only be displayed if the 4mA and/or 20mA
points were set.
ESC: The calibration will be canceled and the last calibration will be restored.
Basic calibration procedure:
Connect the calibrator to channel one or two and enter the mA calibration mode. See the 4-20mA
•
POWERED (ACTIVE) CALIBRATOR WIRING wiring diagram (
manual.
Apply a 4mA signal. Allow time for the reading to settle.
•
Press 4mA to set the display to 4.00mA.
•
Apply a 20mA signal. Allow time for the reading to settle.
•
Press 20mA to set the display to 20.00mA.
•
Repeat the 4mA and 20mA cal points if desired.
•
Press ENT to accept and store the new calibration, or press ESC to restore the original
•
calibration.
Select a PO channel from the CAL OUT SELECT screen. To calibrate the process output (PO1/PO2),
one must connect either a DMM (mA input) or other device that can read the PO1/PO2 current output.
The device should have, at least, 0.01mA precision. The 4mA and 20mA points are set regardless of the
POx MODE selection.
Press the PO1/PO2 push button to enter the CAL ADJUST POx screen.
1.
Press the 4mA push button and the mA meter should read around 4.00mA.
2.
Use the INC & DEC push buttons to set the output to exactly 4.00mA.
3.
Press ENT to accept the new value or ESC to discard the new value.
4.
Press the 20mA push button; the mA meter should read around 20.00mA.
5.
Use the INC & DEC push buttons to set the output to exactly 20.00mA.
6.
Press ENT to accept the new value or ESC to discard the new value.
7.
The two points are not interactive so one should not need to readjust each point again.
8.
Press the ESC push button to go back to the POx selection menu.
9.
GAS INPUT CALIBRATION WITH A 4-20mA CALIBRATOR
4-20mA OUTPUT CALIBRATION
) in this
see WIRING section
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