ENMET OMNI-4000 User Manual
Page 50
ENMET Corporation
OMNI-4000 S/N 6705 and above
44
Inputting the Calibration Gas Value
This procedure defines the content of the calibration gas to be applied to the explosive gas channel sensor. The
maximum permissible content is 100% LEL.
The display reads:
To modify this value:
• Select the units by repeatedly pressing the MENU switch. When the desired value appears, press BACKLIGHT
switch.
• Select the tenths of a unit by repeatedly pressing the MENU switch. When the desired value appears, press
BACKLIGHT switch.
• Select the hundredths of a unit by repeatedly pressing the MENU switch. The units and tenths can be accessed
again by pressing the BACKLIGHT switch. When the calibration gas value is complete, press the ENTER
switch.
The value of the calibration gas to be applied is memorized.
Calibrating the Zero Point
This must be performed in an area that is free of gas contamination. The display reads, for instance:
• Press the ENTER switch. The zero is set automatically by the OMNI-4000 electronics for future internal
calculations.
Calibrating the Sensitivity
The display shows the offset value obtained during the zero calibration phase, for example:
The value is always stated in % LEL CH
4
. Do not press a switch.
• Apply the calibration gas. You must be able to just hear the gas. The flow rate must be approximately 1 l/min.
• When the readings have stabilized, press the ENTER switch. The display shows:
Press: • The ENTER switch to confirm the reading. The return to the initial "Calibrate a Sensor" menu is automatic
unless there is a problem (See "Problems" paragraph). 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 not
further channels to calibrate, go to the "Return to The Operator Mode" paragraph.
• Pressing any other switch results in the return to the initial "Calibrate a Sensor" menu without memorizing the
value entered during the above calibration procedure.
Cal gas
100%LEL
CH4
Zero value
001 LEL
CH4
Span value
001 LEL
CH4
Accept:
ENTER
Cancel: ¨