Specifications

Halogen Gas Monitor – Multi Zone
Instruction 3015-5074 35
Depending on the nature of the fault, the HGM-MZ may or may not continue to operate normally. Under a
non-critical fault condition, the HGM-MZ will continue to measure and log data, but some peripheral functions
may be compromised. Under a critical fault condition, action is required for the HGM-MZ to operate normally.
The table on the following page lists the various fault conditions and explains what action should be taken to
correct the problem.
Navigating to the Fault Screen
Displayed on the initial Data Display Screen is a Fault option. Scroll down with the cursor key and select this
option, which will introduce you to the Fault Screen.
Fault Screen
Critical Faults
• NO FLOW ON ZONE – Go to the Data Display Screen and press the FAULT key. This will display a
“NO FLOW” message in each individual zone affected. Check for a blockage in the air sample line or at
the line end filter. Once the blockage has been cleared, the HGM-MZ will return to normal operation
after the zone has been sampled. NOTE: This can take some several minutes since it is dependent
upon how many zones there are and their lengths. The HGM-MZ will clear the fault the next time it polls
the effected zone and the HGM-RD will return to normal operation the next time that it polls the HGM-
MZ.
• NO FLOW ON PURGE – Check the purge line for a blockage. Verify that the length of the purge line
and exhaust line do not exceed 500 feet in length.
• NO FLOW DETECTED – Check for proper pump operation. Examine the hydrophobic filter for
contaminants or water on the input side. If the input side is gray, a contaminant is present and the filter
must be replaced. To drain, remove the tubing from both sides of the filter and tap the tubing on a hard
surface to dislodge the contents.
• CLIPPING FAULT – The detector voltage may be out of tolerance. Refer to the Diagnostic Screen for
the DET voltage, AVE voltage and ZERO voltage. Call the factory with this information for further
instructions.
• REZERO VOLT TOL – The detector output voltage is out of tolerance. Refer to the Diagnostic Screen
and contact the factory for assistance.
• TRIGGER FAULT – No trigger from IR source pulser. Contact factory with all information from the
DIAGNOSTIC SCREEN for further instructions.