MeshGuard LEL IR & CO2 IR User’s Guide
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The display now counts down to 0.
After counting down and reaching 0, the LCD displays “dn.” The reading should be the span
concentration value. Otherwise, the span calibration should be repeated. (LEL value is shown
here.)
If the MeshGuard LEL IR or MeshGuard CO2 IR does not detect gas after counting down to 0, the
LCD displays “Err” (for “error”). The LED glows red and the buzzer sounds to provide extra warning.
The MeshGuard LEL IR automatically returns to the span calibration display.
Note: This could mean the sensor is contaminated or expired.
Note: To stop span calibration before the countdown reaches 0, press any key. The LCD displays
“no” and advances to the next programming menu, Change High Alarm.
If the sensor fails, try to recalibrate it again. If calibration fails again, replace the sensor.
IMPORTANT!
Due to certification requirements, the MeshGuard LEL IR’s High Alarm and Low Alarm values
cannot be set above 60% LEL.
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