An alarm device consists of a probe, wiring, and a cabinet – what are the differences in the specific wiring configurations?
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This post was last edited by zlky2005 on 2015-10-28 at 17:05. An alarm device consists of a sensor, wiring, and a cabinet. Now, aside from the difference in sensors, what are the specific wiring differences between LEL alarms and PPM alarms?
It depends on the specific manufacturer and model; find the manufacturer’s manual or guide to find out
The probes are available for combustible gas LEL and toxic gases ppm, with options for display as well as audible and visual alarms； There are currently two wiring methods: two-wire system, three-wire system (also known as split-wire system), and bus system. The mainstream configuration is three-wire, which is widely used internationally and relatively stable. Alarm controllers are classified into branch controllers and bus controllers. The display section is divided into independent display and inspection display.
There is no difference in wiring; just pay attention to the range and alarm values when setting them on the digital display of the cabinet. (Variations exist among different manufacturers regarding wiring; this is for reference only.)