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4.5C Calibrating the Oxygen and Thermocouple Inputs
Refer also to Fig 4.1C on previous page.
COMMISSIONING
ACJC const
Max (O
) mV
2
or
Enter
Min (O
) mV
2
or
Enter
Cell temp zero
or
16
Select the Commissioning Pa .
Operate for approximately three seconds to gain access to the electrical
calibration procedures within the Commissioning Page.
Advance to electrical calibration procedures.
Twice
N o t e . 'x x x x x x' in the following illustrations is a numerical code used for
software analysis during manufacture and can be disregarded.
Automatic Cold Junction Compensation (ACJC) Constant
& ENT
OXYGEN INPUT ELECTRICAL CALIBRATION
Connect the millivolt source in place of the 'PROBE CELL' connections – see
Section 5.4.1 or 5.4.2 in ZMT/0011.
Range Maximum
x x x x x x
Set 217.6 mV on the millivolt source, i.e. simulating 0.05%O
Set '217.6' on the upper display.
Store.
Advance to next parameter.
Range Minimum
x x x x x x
Set –6.4mV on the millivolt source, i.e. simulating 25%O
Set '–6.4' on the upper display.
Store.
Advance to next parameter.
Disconnect the millivolt source from the 'PROBE CELL' terminals and remake
original cell connections.
CELL THERMOCOUPLE INPUT ELECTRICAL CALIBRATION
Connect the millivolt source in place of the 'CELL T/C' connections using
Ni-Cr/Ni-Al compensating cable – see Section 5.4.1 or 5.4.2 in ZMT/0011.
Cell Temperature Zero
x x x x x x
Measure the ambient temperature at the 'CELL T/C' terminals and, from
standard type K thermocouple tables, obtain the millivolt equivalent of this
temperature (a).
Subtract (a) from 0 and set the resultant value on the signal source.
Example. Ambient Temperature: 25°C
Set '0' on the upper display.
Continued opposite.
Millivolt equivalent: 1.00mV
Set millivolt source to: 0 – 1.00(mV)
–1.00mV
at 1400°C.
2
at 1400°C.
2
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