About contact combustion type gas sensor

Q.1What kind of gas can be detected?

A.All combustible gases (methane, isobutane, hydrogen, propane, etc.).

Q.2What are the main uses?

A.It is used in gas leak alarms for city gas, LP gas, etc., incomplete combustion prevention devices for water heaters, and fuel cell safety devices.

Q.3Is there a specification for the storage environment after purchase?

A.The recommended storage temperature is -20 ° C to 60 ° C.Please contact us if it is difficult to store within this range.

Q.4Does it have an explosion-proof structure?

A.It depends on the sensor.Please refer to the catalog for details.

Q.5What does LEL mean?

A.It is the lower explosive limit.If the flammable gas exceeds this concentration in the air, it will explode in a chain reaction when ignited.

Q.6What kind of unit is% LEL?

A.It is the concentration with respect to LEL when the above LEL is 100%.For example, the LEL of methane is 5%, so when the methane is 1% in the air, it is 20% LEL.

Q.7What happens if the sensor is exposed to a gas that exceeds the lower explosion limit?

A.High-concentration gas may affect the output and sensitivity of the sensor depending on the type.In addition, sensors that are not explosion-proof or simple explosion-proof may explode, so it is necessary to use different types of sensors depending on the application.

Q.8Is it possible to use it in an environment of 100 ° C or higher?

A.Some sensors are compatible with some models.

Q.9What is relative gas sensitivity?

A.It is used to express the sensitivity of another gas when the sensitivity of one gas is used as a reference.For example, if methane is 100% and hydrogen is 110%, the hydrogen output will be 1.1 times the methane output.

Q.10How long is the response time?

A.Depending on the sensor, contact combustion sensors typically take less than 90 seconds at T90 (the time it takes to reach 20% of the sensitivity at each concentration).

Q.11Please tell me the detection principle

A.Please refer to here.