How to wire a combustible gas alarm?
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3 wires come in: one for V+, one for S+, and one for GND. Is it necessary to connect a low alarm in series?
No need, take the first 3; it seems to be a alarm from Henan Hanwei
1、V+2、GND3、S+
The first three. The latter two groups are alarm output dry contact signals. Reconnect if needed
In the power supply room, connect the +24V terminal to the DC24V line, and the negative terminal to GND. For the output signal line, connect the positive terminal to OUT and the negative terminal to GND.
For the alarm output wiring, it is necessary to determine whether the contacts are normally open or normally closed, as well as what device they control. If both the high and low contacts are normally open and they are used to control one device, those two contacts need to be connected together.
The power supply DC24V is connected to the +24V terminal, the positive end of the output signal line is connected to OUT, and the GND terminal serves as a common point. The following are the normally closed and normally open contacts, also known as interlock contacts. Generally, low-level alarms correspond to normally closed contacts, while high-level alarms correspond to normally open contacts.
The alarm contacts of such gas detectors are mostly normally open without a seal.