ENMET OMNI-4000 User Manual

Page 57

OMNI-4000 S/N 6705 and above

ENMET Corporation

Starting the Setting Procedure:
The display shows alternately:

• Press ENTER to display the sensitivity reading. The display shows, for example:

• Apply the calibration gas. You must just be able to hear the gas. The flow rate must be approximately 1 l/min.
• When the reading has stabilized, adjust the value by turning the sensitivity potentiometer. See Figure 3-13. The

value is increased by turning it clockwise.

Figure 3-13: Location of Explosive Gas Channel Sensitivity Potentiometer

• When a value corresponding, or as near as possible, to the calibration gas value has been reached, press ENTER.

The display shows:

• If no errors are detected and when ENTER is pressed, the display shows:

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

• "Zero incorrectly set": Check the local atmosphere (gas present) and recalibrate. If the fault persists, change the

sensor.

• "Sensitivity incorrectly set": A discrepancy exists between the injected calibration gas content and that set in the

"Inputting the Calibration Gas Value" procedure. Restart the calibration procedure. If the fault persists, change
the sensor.

Please wait for

stabilization

Then set

zero

Sensitivity

20%LEL

CH4

Accept:

ENTER

Cancel: ¨

Program a

sensor

Sensitivity
Potentiometer