Ampcontrol Pty Ltd
– ABN 28 000 915 542
GG2 DISPLAY USER MANUAL
GG2B023 Version 3
– JUNE/19
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 56 of 82
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in a powered-up operational (no fault) state for one hour before beginning calibration.
Calibration of the 4-20mA output should be completed in line with regulatory and operational
requirements.
Please note that the 4-20mA calibration procedures are similar to the telemetry test (Section
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eference source not found.
) and all outputs of the device will be forced to zero or full-scale.
CAUTION!
The 4-20mA calibrations may trigger alarms and setpoint flags.
The calibration procedure calibrates each of the outputs independently. The calibration procedure should
be completed as follows:
1. Connect the 4-20mA loop to the NATA calibrated current measurement device and ensure that
the 4-20mA output is enabled (see 6.4.5.3). If the device is working normally the measurement
should be between approximately 2 and 22 mA.
2.
Access the “4MA CALIBRATION” or “20MA CALIBRATION” screen, refer to Section 6.1.2. The
notice below will be displayed for a few seconds.
Figure 64: Calibration Notice (left) & 4mA Calibration (right)
3. The calibration measurement input screen will appear and the 4-20mA output will be forced to
what the device expects to be 4mA (or 20mA).
NOTE
In this example the “SETPOINT FLAG SET” status is present, as the
device is at 0% gas which is below setpoint 1.
4. Take the measurement from the NATA calibrated device and enter that measurement into the
device. Section 6.1.2.2 provides further guidance on editing values. Once the desired value has
been entered, press the centre segment of the keypad.
5. The saving changes screen will be shown and the calibration stage is complete.
6. It is recommended that, following a pair of calibrations (4mA and 20mA), a telemetry test is
performed to verify that the output varies as intended.
