Bacharach HGM-SZ Installation & Operation Manual

Also see for AGM-SZ: Product catalog Installation & operating instructions

Bacharach HGM-SZ Installation & Operation Manual Manual pdf 7 page image

Single Zone Gas MonitorP/N: 3015-4256 Rev 13 31.5.8. FusingWARNING: This device uses type “F” fuses (F1 and F2) rated at 1.0 A, 250 VAC.Replace ONLY with Bacharach-approved fuses.1.5.9. Installation CategoryIMPORTANT: This device is classified as Installation Category II, Pollution Degree II, asdefined by UL.1.5.10. Altitude LimitIMPORTANT: This device is designed for operation at or below an altitude of 6,562 ft(2,000 m). Do not operate this device above this altitude limit.1.5.11. CleaningNOTE: To clean the outside of the case use a dry cloth. To avoid shock hazard and/orequipment damage, DO NOT use soap and water.1.6. Functional Overview1.6.1. General Description and UseSingle zone gas monitors are specified to support compliance to federal, state and local safety codesgoverning gas emissions. Avoiding significant loss reduces equipment replacement costs, maintainsequipment efficiency, promotes safety, and protects the environment.The Bacharach SZ is designed to continuously test for the presence of gas in an area that is located up to500 ft (152.4 m) away from the monitor. The SZ monitor displays the type of gas being monitored, alongwith displaying both the current gas level and the peak gas level detected in that area on its front panelLCD. 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 relaycontacts are provided that can be used to trigger external alarm devices in the event of a system fault, orif a leak (small), spill (medium), or evacuation (large) level of gas is detected. The system also includes a4−20 mA current loop interface that can be connected to remote monitoring equipment.The 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 frontpanel indicator is provided to alert an operator of system malfunctions, and fault codes are generated thatenable the operator to identify the cause of the fault.1.6.2. Understanding Monitoring LevelsEffective use of this monitor requires an understanding of what constitutes reasonable alarm set points forthe type of gas being monitored. Most systems leak some gas. In a good “tight” installation thesebackground levels will be acceptably low and often do not require corrective action. You can reducenuisance alarms and needless service calls if the alarm levels are set at practical limits. Bacharach hasdeveloped recommended monitoring levels based on compliance to ANSI/BSR ASHRAE 15-2007 andASHRAE Safety Code 34-2007. These reference levels are listed in the Appendix.