38
CALIBRATING AND SERVICING THE OXYGEN PROBE
Calibration
WARNING: Before proceeding with probe calibration, ensure you have a suitable air and
reference gas supply, since both are required to complete the calibration procedure.
The calibration gas concentration must be entered as option parameter 30.3 and the oxygen
trim function must be disabled using option parameter 30.5.
The probe calibration must be executed in sequence or the calibration will be invalid.
Proceed with probe calibration as follows:
1.
Enter option set mode using the site passcode.
2.
Change the current option parameter to 30.6. The bottom right display will show the status of
calibration.
3.
With the bottom right display showing 0 the system is not in calibrate mode.
4.
Change the bottom right display to 1 and then enter. The oxygen trim function will be disabled
and the system is in calibrate air mode.
5.
Apply the calibration air supply to the oxygen probe calibration port. Once this has been con-
nected, exit to RUN mode and select the oxygen display. This enables the probe offset to be
viewed. Allow this value to settle and then re-enter option set mode.
6.
Ensure option 30.6 is still being displayed and increment the bottom right display to 2 and then
enter. The oxygen trim function will remain disabled and the system will be in calibrate refer-
ence gas mode.
7.
Apply the calibration gas to the oxygen probe calibration port, ensuring that its value is as
entered into the option parameter 30.3 (oxygen probe calibration gas concentration).
8.
Once this gas has been connected exit to RUN mode and select the oxygen display. This enables
the probe gain to be viewed. Allow this to settle and re-enter option set mode.
9.
Ensure option 30.6 is still being displayed and change the bottom right display to 0 and then
enter. The new calibration values will now be used for the oxygen probe, and can be viewed via
parameters 30.1 and 30.2.
10.
Before enabling the oxygen trim function using option parameter 30.5, ensure that the calibra-
tion gas supply is removed from the probe and that the probe calibration port end cap is fitted, to
prevent incorrect operation.
Oxygen Probe Filter Testing
The filter can be tested without removing the probe from the flue. Before proceeding, ensure the oxy-
gen trim function is disabled using option parameter 30.5.
The check is carried out by passing air at 350cc/min (22cu. ins/min) into the calibration gas connec-
tion on the rear of the probe adjacent to the flexible conduit fitting, and checking the pressure drop.
The pressure drop can be found by connecting a manometer or similar in the flow line to the calibra-
tion gas connection, as shown below.
