I have two questions regarding the wiring of gas detectors
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Are there any gas detectors on site? I have a few questions. 1. What is the wiring system for the gas detection alarms that are commonly used by you? 2. Do the gas detectors you use come equipped with on-site audible and visual alarms? What are the differences in wiring between detectors that have such alarms and those that do not?
It is generally three-wire system; the bus type is two-wire system. For on-site alarm settings, refer to GB50493
Typical gas detectors use a three-wire system; those with audible and visual alarms are connected directly to a 24V power supply, seemingly via the AC0 terminal
Most of those we use are four-wire, with one set for power and one set for alarm. There is no difference in wiring between detectors with acoustic and optical alarms and those without them; the price differs.
Three-wire system. There is no fundamental difference in wiring between detectors with acoustic and optical alarms and those without them ；
1. Three-wire system 2. No difference. It’s the wiring socket for multiple audio and light alarms
For gas detectors, there are many three-wire connection methods. Sound and light alarms are peripheral devices, while gas detectors have interfaces