Question 1

Can a single detector sense all types of combustible gases?

Accepted Answer

Not necessarily with the same accuracy. While a catalytic bead sensor can respond to a broad range of combustible gases, its response will vary for each gas. Most detectors are calibrated to a specific gas (commonly methane or pentane). When detecting a different gas, a "correction factor" must be applied to the reading to get an accurate concentration. Infrared (IR) sensors are more specific and are typically set up for a single gas or a family of gases like hydrocarbons.

Question 2

Are there combustible gas detectors for high-temperature environments?

Accepted Answer

Yes, specialized detectors are available for high-temperature applications. Standard sensors often have an upper operating limit of around 50-60°C (122-140°F). For environments like turbine enclosures, compressor stations, or industrial drying ovens, you need specialized detectors for extreme heat that are engineered with specific sensor technologies and materials to operate reliably and accurately at much higher temperatures.

Question 3

What is the typical lifespan of a combustible gas sensor?

Accepted Answer

The lifespan varies significantly by technology and operating conditions. Catalytic bead sensors typically last 3 to 5 years, as the catalyst is consumed over time and can be depleted by exposure to gas. Infrared (IR) sensors, having no consumable components in their sensing mechanism, have a much longer lifespan, often exceeding 5 to 10 years. MOS sensors also generally have a long operational life of 5 years or more.

Question 4

How do I know if my sensor is 'poisoned'?

Accepted Answer

The most dangerous thing about a poisoned catalytic bead sensor is that it may show no outward signs of failure; it will simply read zero even in the presence of gas. The only way to be certain a sensor is not poisoned is to test it. A successful bump test confirms the sensor is still active. If a sensor fails a bump test or cannot be successfully calibrated, it is likely poisoned or has reached the end of its life and must be replaced immediately.

What is a Combustible Gas Detector? And 5-Step Selection Guide

Buyer’s Guide: 7 Critical Factors for Choosing an Online Gas Detector

Resources

Products