Bacharach HGM-SZ Specifications download pdf (Page 7)

Instruction 3015-4256 3

Functional Overview

General Description

Refrigerant monitors are specified to support compliance to federal, state and local safety codes governing gas

emissions. Avoiding significant refrigerant loss reduces equipment replacement costs, maintains equipment

efficiency, promotes safety, and protects the environment.

The Bacharach HGM-SZ (Halogen Gas Monitor Single Zone) is designed to continuously test for the presence

of refrigerant gas in an area that is located up to 500 ft (15.2 m) away from the monitor. The HGM-SZ displays

the type of gas being monitored, along with displaying both the current gas level and the peak gas level

detected in that area on its front panel LCD. The monitor retains a log of previous readings that can be easily

accessed for analysis.

An audible alarm and front panel indicators are provided to signal alarm and fault conditions, and relay contacts

are provided that can be used to trigger external alarm devices in the event of a system fault, or if a leak

(small), spill (medium), or evacuation (large) level of gas is detected. The system also includes a 4−20 mA

current loop interface that can be connected to remote monitoring equipment.

The HGM-SZ requires only minor periodic maintenance such as the occasional replacement of filters. The

monitor incorporates active diagnostics that continuously check the system for proper operation. A front panel

indicator is provided to alert an operator of system malfunctions, and fault codes are generated that enable the

operator to identify the cause of the fault.

Understanding Monitoring Levels

Effective use of this monitor requires an understanding of what constitutes reasonable alarm set points for the

type of gas being monitored. Most systems leak some gas. In a good “tight” installation these background levels

will be acceptably low and often do not require corrective action. You can reduce nuisance alarms and needless

service calls if the alarm levels are set at practical limits.

The HGM-SZ is shipped with its leak, spill, and evacuate alarm levels set at 50, 150 and 300 ppm, respectively.

Setting the monitor at these recommended alarm levels will satisfy the needs of most users. However, the ppm

levels generated by system leaks into the environment are greatly influenced by the volume of air in the

sampling area, air circulation, size of the leak, distance to the monitoring point, and a host of other variables. In

some cases the alarm set points may need to be adjusted either up or down to achieve effective monitoring.

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Bacharach HGM-SZ Specifications Page 7