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Functional Overview
General Description
Ammonia monitors are specified to support compliance to federal, state and local safety codes governing gas
emissions. Avoiding significant ammonia loss reduces equipment replacement costs, maintains equipment
efficiency, promotes safety, and protects the environment.
The Bacharach AGM-SZ (Ammonia Gas Monitor Single Zone) is designed to continuously test for the presence
of ammonia gas in an area that is located up to 500 ft (152.4 m) away from the monitor. The AGM-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 AGM-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 AGM-SZ is shipped with its leak, spill, and evacuate alarm levels set at 100, 300 and 500 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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Instruction 3015-4286
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