MeshGuard User's Guide
When the gas flow starts, the LCD displays "gAS" and the span concentration value.
The MeshGuard now counts down to 0.
Note: The countdown time varies according to the type of sensor used in the MeshGuard.
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.
If the MeshGuard 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 automatically returns to the span calibration
display. In this case, you should attempt another calibration. If the span calibration fails a second calibration, the
sensor may need to be replaced.
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.