Bacharach 3015-4286 Installation & Operating Instructions Manual

Bacharach 3015-4286 Installation & Operating Instructions Manual Manual pdf 7 page image

Instruction 3015-4286 3Functional OverviewGeneral DescriptionAmmonia monitors are specified to support compliance to federal, state and local safety codes governing gasemissions. Avoiding significant ammonia loss reduces equipment replacement costs, maintains equipmentefficiency, promotes safety, and protects the environment.The Bacharach AGM-SZ (Ammonia Gas Monitor Single Zone) is designed to continuously test for the presenceof ammonia gas in an area that is located up to 500 ft (152.4 m) away from the monitor. The AGM-SZ displaysthe type of gas being monitored, along with displaying both the current gas level and the peak gas leveldetected in that area on its front panel LCD. The monitor retains a log of previous readings that can be easilyaccessed for analysis.An audible alarm and front panel indicators are provided to signal alarm and fault conditions, and relay contactsare 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 mAcurrent 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. Themonitor incorporates active diagnostics that continuously check the system for proper operation. A front panelindicator is provided to alert an operator of system malfunctions, and fault codes are generated that enable theoperator to identify the cause of the fault.Understanding Monitoring LevelsEffective use of this monitor requires an understanding of what constitutes reasonable alarm set points for thetype of gas being monitored. Most systems leak some gas. In a good “tight” installation these background levelswill be acceptably low and often do not require corrective action. You can reduce nuisance alarms and needlessservice 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 volumeof air in the sampling area, air circulation, size of the leak, distance to the monitoring point, and a host of othervariables. In some cases the alarm set points may need to be adjusted either up or down to achieve effectivemonitoring.