Natural Gas Detection 

Description and Purpose

The Natural Gas Sensor is a device that detects when the air in a protected area contains high levels of natural gas.  When the protected area is within an acceptable level of natural gas, the sensor sends status data to the control panel indicating the normal condition. Likewise, when the area contains higher-than-acceptable levels, the sensor sends data to the control panel associated with the undesired status. Users see status and alarms from the sensor at the local keypad. The control panel can also send a message to the monitoring station.

The Natural Gas Sensor can be used for supervising natural gas in laboratories, heater closets, kitchens, water heater closets, and other applications where combustion or flame is necessary.

Reasons to Choose this Sensor

The Natural Gas Sensor provides some important advantages.

Cabling requirements are minimized because the sensor cable need not be individually routed to the control panel. The sensor cable is an addressable bus that allows connection to many devices before cabling and connecting to the control panel for processing.

The sensor is protected against transients, helping the sensor to overcome voltage spikes causes by lightning or misconnections.

Figure 1: Routing the V-Plex™ Bus to the Natural Gas Sensor

Connections and Considerations

The table below refers to the drawing in Figure 1. If you are using this document on line, click the model number in the table below to see more information.


Model No.


Mounting Options




Natural Gas Detector

Refer to Manufacturer

Requires 4193SN



Adapter: Serial Interface Module

Inside of monitored device.




Power Supply (DC Voltage indicated)

In enclosure

Selectable 12VDC or 24VDC operation when using XF30 transformer.



V-Plex™ Data Bus


Connects to addressable devices, zone input devices and relay modules.



2-wire, 18 AWG, Fire rated, Non-shielded

Use Genesis 1118 for Non-Fire Applications

This part number is an example. See your building and electrical codes for actual jacketing requirements.


Design Considerations

Mount the Natural Gas Sensor on to a flat surface or on a single-gang back box.

Route the specified cable from the control panel location, or from the nearest V-Plex device to the sensor. If more detection devices are needed, continue routing the V-Plex bus on to other device locations.