What to consider when installing a gas detection sensor?

User:JXCTUpload time:Feb 17 2023

Gas detection sensor installation

Gas detection sensor installation height and location guidelines: It is important to install the gas detection head in the area that is most likely to be first exposed to a gas leak, or in an area that is most representative of the gas level in the area being monitored.

Gas detection sensor
Gas detection sensor

Here are some criteria to consider:

1.Gas Density:

When testing LEL levels for gases and vapors, the density of the gas should be considered. Dense gases like propane and gasoline are heavier than air and tend to collect near the floor. For these gases, it is best to mount the sensor a few inches from the floor. Less dense gases such as hydrogen or natural gas are lighter than air and tend to collect near the ceiling. For these gases, it is best to mount the sensor within a few inches of the ceiling.

2.Toxic Gases:

Where safe breathing levels are the primary concern, the sensor should be located in the typical breathing zone, 4 to 6 feet from the ground. For detection at low ppm levels, the density of the gas does not matter as the gas diffuses and flows with normal ventilation in the area.


Consideration should be given to the location of ventilation intake and exhaust ducts in the room. Sensors should not be located near ducts that blow fresh air into the room, as the air will not be representative of the monitored area. The sensor can be located near the duct that exhausts the air from the monitored area, as air from the surrounding area will be drawn towards this location.

4.Source of leak:

Where is the most likely source of gas leaks in the room? Sensors should be located near possible leak conditions. For example, if you have a large room and you have a gas tank in one corner of the room or a process involving gases or solvents, it is important to mount the sensor close to the source of the potential leak. If gas can leak from anywhere in the room or from many locations in the room, it is necessary to monitor the entire room.

Sensor coverage area

How much area does a sensor cover? The sensor is like your nose, which means it can only sense its surroundings. The trick is to strategically place sensors to detect gas leaks using the techniques listed above. For large open areas, the industry rule of thumb is to space sensors 30-40 feet apart. This can be more or less dependent on the area and budget to be monitored.