Bacharach HGM-SZ Specifications download pdf (Page 29)

Instruction 3015-4256 25

Maintenance

Warnings and Cautions

WARNING: Always disconnect AC power before working inside the monitor.

CAUTION: When working inside the monitor, be very careful not to dislodge any electrical

wiring or pneumatic tubing. The HGMSZ contains sensitive electronic components that can

be easily damaged. Be careful not to touch or disturb any of these components.

Charcoal Filter

The Charcoal Filter (Page 8) removes refrigerant gas from the purge-air stream during the purging

process. Replace the charcoal filter (P/N 3015-4306) about every 6 months, when a zero filter fault occurs

(fault code <0100>), or after the monitor itself has been exposed to unusually high levels of refrigerant gas,

such as after an evacuation alarm.

Hydrophobic Filter

The Hydrophobic Filter (Page 8) prevents water from entering the IR detector. A zone flow fault will occur

(fault code <0800>) if this filter should become blocked. Replace the hydrophobic filter as required

(P/N 07-1650).

Servicing Air Lines & Termination Filters

The gas sample line and optional exhaust line should be periodically checked for obvious signs of kinks,

damage, and contamination. Replace the tubing as required (P/N 304-2743).

The gas-sample line and purge-line termination filters prevent dust and dirt from entering the monitor.

Both of these filters should be periodically checked and replaced when there are obvious signs of

contamination. A zone flow fault will occur (fault code <0800>) if the gas-sample line filter becomes

blocked, while a purge flow fault will occur (fault code <1000>) if the purge-line filter becomes blocked. To

service the filter, simply remove it from the line and replace it with a new one (P/N 3015-3420).

Fuses

The HGMSZ is protected from electrical damage by two, 1 A, 250 V, type “F” fuses (Page 8). Carefully

remove the fuses from their fuse clips and visually inspect each fuse for damage. Replace the fuses as

required (P/N 04-2620).

Clock Battery

The Clock Battery (Page 8) maintains the correct date and time when AC power is not applied to the

monitor. Replace this battery about every 2 years (P/N 204-0020).

Sample Pump

The Sample Pump (Page 8) draws the gas sample into the monitor, through the IR detector, and

discharges the sample out the monitor’s exhaust port. When replacing the pump, remove its inlet and

outlet tubing, disconnect the AC power wires from the pump itself, and remove pump from monitor. Install

a new sample pump (P/N 3015-4239).

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Bacharach HGM-SZ Specifications Page 29