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4.
INSTRUMENT CHECKS
Automatic Sensor Check
If a gas sensor fails (opens up), the display shows "Replace Methane Sensor".
Automatic Pump Check
If the intake is blocked, the display shows "Flow Blocked" and the detector beeps until the
problem is cleared. This check is carried out whether or not a probe is being used. During the
power on sequence, if a blocked flow is not detected within 40 seconds (from manually blocking
the intake to the pump), the detector displays "No Block Check Probe" then "Remove Probe and
Block Intake", and finally "Repair Pump".
Check for Tight Connections
To check for tight connections, block the probe inlet to observe "Flow Blocked" on the
display. If "Flow Blocked" fails to appear, there may be a leak.
WARNING:
The instrument will not operate when first turned on if it fails to block when the air
intake is blocked. Subsequently, however, connections can only be checked by
blocking the probe inlet and observing "Flow Blocked" on the display. If "Flow
Blocked" fails to appear, the probe and/or inlet must be checked for leaks.
Automatic Zero
The zero is adjusted automatically when "Zero" is chosen from an appropriate display.
CAUTION:
Zero adjustment must be carried out in clean air; otherwise, a systematic error will be
introduced in subsequent measurements. The instrument will auto zero in concentrations
of methane below 0.10% GAS and concentrations of CO below10 ppm.
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