Gas detector selection issues

This post was last edited by guyi159 on 2010-8-23 at 15:19. What type of combustible gas sensor do you need? Catalytic combustion, electrochemical, or infrared? For hydrogen, catalytic combustion sensors are quite sensitive and can detect it quickly; if higher precision is required, they can also be used for detecting toxic gases with accuracy down to the ppm level. Infrared sensors are not suitable for detecting hydrogen. Gasoline: Catalytic combustion sensors have low sensitivity to large molecular organic compounds such as gasoline, benzene, and long-chain hydrocarbons. For such combustible gases, infrared sensors are generally needed as they provide greater accuracy. You can contact me at 13656190569

Reply to 2# guyi159: What are the advantages of catalytic combustion type over electrochemical type? Do electrochemical probes have a service life of only 2-3 years? What about the lifespan of catalytic combustion type?

Our factory uses Ward alarm devices for hydrogen; their sensors are of the catalytic combustion type and are very sensitive, with precision measured in PPM. Generally, these sensors need to be replaced every 2–4 years

Your email? ? I have information on this.

This post was last edited by guyi159 on 2010-8-24 09:43. Catalytic combustion-type probes are cheaper than electrochemical ones, and they also have a longer service life (3–5 years), whereas electrochemical probes last only 2–3 years. This service life is greatly influenced by the operating environment; in harsh conditions, the lifespan will be reduced. In favorable environments (such as inside electronics factories), their performance can be excellent, and it’s possible for them to last several more years. Regular calibration and maintenance every 3 months are sufficient. Incidentally, infrared probes also have a service life of around 2 years. Additionally, due to their working principle, catalytic combustion-type probes can theoretically detect all combustible gases, though the sensitivity varies depending on the gas. Calibration using the appropriate gas is required. As mentioned above, it’s claimed that catalytic combustion-type probes can reach ppm levels – how is that possible? Are such probes really that sensitive? I’m skeptical

Reply to 5# lipei-723 yutian-630@163.com. Thank you

Reply to 6# guyi159: Which manufacturers do you recommend? Used.

Well, then I’ll volunteer myself for this task, haha. Our company manufactures gas detectors on its own. I can’t recommend other companies; I’m sure you’ll find out about them soon enough, haha. You can compare the product quality, prices, service, and so on. I’ll send some information to your email later – be sure to check it.

Focus Technology is quite good at this; our factory uses their products.

Look for previous posts; there have been many discussions on it. Catalytic combustion is generally used to determine the lower explosion limit. Manufacturers choose the larger ones as they offer more reliability, such as Tecknetic and MSA.