ENMET OMNI-4000 User Manual

Page 51

OMNI-4000 S/N 6705 and above

ENMET Corporation

Problems
As soon as ENTER has been pressed after the sensitivity measurement, the display may show:

• "Excessive zero offset": Check the local atmosphere (gas present) and recalibrate. If the fault persists, change the

sensor.

• "Scale Exceeded": A discrepancy exists between the injected calibration gas value and that set in the "Inputting

the Calibration Gas Value." Perform the calibration procedure again. If the fault persists, change the sensor.

• "Cell used": A possible discrepancy exists between the applied calibration gas values and that set in the "Inputting the

Calibration Gas Value," or calibration was attempted without the gas. Perform the whole calibration procedure again.
If the fault persists, change the sensor.

3.5.2 Calibration of an Oxygen Channel

Equipment Required: None
Preparing the OMNI-4000

• The OMNI-4000 calibration cover must not be in place. See Figure 3-7.
• The "Oxygen" channel must be selected; if not refer to the "Selecting the Channel for Calibration" paragraph.

The Injection Cover is Not Required

Figure 3-7: Calibration of an Oxygen Cannel

Calibrating the Sensitivity
The display shows a value, for instance:

• As soon as the reading has stabilized, press the ENTER switch. The OMNI-4000 adjusts the oxygen reading to

20.9% O

later. The display shows:

• As soon as ENTER has been pressed, the return to the initial menu ("Calibrate a Sensor") is automatic. It is now

possible to calibrate another channel by pressing ENTER. It should be noted that the channel has automatically
been incremented. If there are no further channels to calibrate, go to the "Return to The Operator Mode"
paragraph, below.

Problems
As soon as ENTER is pressed after the sensitivity measurement, the display may show "Sensor used." The sensor
should then be replaced.

Span value:

20.6%

Accept:

ENTER

Cancel: ¨