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6.3 D/A (4-20mA OUTPUT CHANNELS) CALIBRATION
The calibration can either be done using the 'Auto Cal' or 'Manual Cal'.
Auto Cal
The 'Auto Cal' mode is selected in set-up 13 (and 16 for channel 2).
The transmitter will automatically divert the output back to the input, measure the offset
and span, and record the calibration factors for each channel.
If either of the channels are selected to be calibrated manually, an 'Auto Cal' will not
change the factors.
Manual Cal
The 'Manual Cal' mode is selected in set-up 13 (and 16).
Set the 4mA calibration first and then the 20mA calibration.
1. Select 'Set 4mA Trim' in set-up 13 (or 16).
2. Return to RUN mode.
3. Measure the output on the channel to be calibrated with a digital multimeter. If the
current is not exactly 4.00mA, return to set-up mode and change the 4mA calibration
factor in set-up 14 (or 17).
4. Re-measure the current while back in RUN mode until the current is within 3.9 to
4.1mA.
5. Return to set-up mode and select 'Manual Cal' in set-up 13 (or 16).
Set the 20mA calibration factor.
6. Select 'Set 20mA Trim' in set-up 13 (or 16).
7. Return to RUN mode.
8. Measure the output on the channel to be calibrated with a digital multimeter. If the
current is not exactly 20.00mA, return to set-up mode and change the 20mA calibration
factor in set-up 15 (or 18).
9. Re-measure the current while back in RUN mode until the current is within 19.9 to
20.1mA.
10. Return to set-up mode and select 'Manual Cal' in set-up 13 (or 16).
This calibration is now saved in battery backed memory until
The factors are changed in the manual calibration
The transmitter is forced into a COLD-START (see section 6.1)
The calibration mode in set-up 13 (or 16) is changed to Auto Cal and an Auto Cal is
initiated.
NOTE:
The 4mA or the 20mA trim mode will only be held on the output channels for 30
minutes before automatically returning to 'Manual Cal' mode in set-up 13 (or 16).
6.4 PUMP REPLACEMENT
The reference air pump is mounted on the 1630-2 PCB in the base of the transmitter. The
operation of the pump is monitored by the transmitter and alarms will be shown if a fault
occurs. ("Pump Fail" alarm)
To replace the pump, unplug all the field wiring terminals.
connector etc.
The nuts for the pump screws are captive into the PCB, enabling the pump to be removed
WITHOUT removing the PCB. The pump wires can be unplugged.
75
9060-Zirconia Analyser
ie. Probe connectors, power
75
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