Specifications

Halogen Gas Monitor – MultiZone Remote Display
Instruction 3015-5157 38
System Faults
Functional Overview
If a system malfunction occurs, the HGM-MZ will detect the problem and cause its yellow FAULT LED to
glow. Additionally, an external alarm device may activate and an audible alarm may sound if those features
have been enabled (Pages 21 & 25).
The next time the HGM-RD polls the affected monitor its yellow FAULT LED will also glow. Additionally, an
external alarm device may activate and an audible alarm may sound if those features have been enabled
(Pages 16 & 25).
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
Display the System Screen (Page 19); and then press the FAULTS key to display the Fault Screen of the
selected monitor.
Fault Screen
CRITICAL FAULTS
• NO FLOW ON ZONE – Go to the System Screen (Page 19) and press the ZONES key. The Zone
Screen 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 may take 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 300 feet in length.
• NO FLOW DETECTED – Check for proper pump operation. Check the water trap – drain if necessary.
• CLIPPING FAULT – The detector voltage may be out of tolerance. Check the Diagnostic Screen for
the DET voltage, AVE voltage and ZERO voltage. Call the factory with this information for further
instructions.