How to select and use detection instruments for toxic and harmful gases
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Our company has used some online analyzers for toxic and harmful gases, and we have observed the following: 1. It takes a long time for a reaction to occur once the test gas is introduced at the detection port. If the toxic gases were that severe, everyone would be in danger; then what’s the use of instruments for prediction? This is the only thing you can do when asking the manufacturer! 2. How is the testing or calibration carried out? It’s all sent to the manufacturer now; he said it’s fine, so that’s that. 3. It seems that none of these instruments have a single sensitivity; so how can interference factors be prevented?
It takes a long time to get a response when the test gas is placed at the detection port. This indicates that the detection unit is no longer sensitive enough. Testing or calibration is carried out by third-party quality supervision agencies; toxic and harmful gas detection instruments are considered **instrumentation subject to mandatory inspection, and the manufacturer’s opinion does not count.
The response time of the sensor should not exceed 60 seconds. It should be inspected once a year, and those that fail the inspection must be replaced promptly.
Online detection is continuous and analyzes components. So there’s no problem. Alarm devices are quite sensitive. Don’t get it mixed up!
Online analyzers take time to analyze, so there is some delay, but toxic and harmful gas detectors are quite sensitive. I think the number of employees in a chemical plant should be kept as low as possible, and their qualifications should be high; bringing a well-trained dog to the site would be a good solution.
The response time of the PID toxic gas detector is also very short, and the installation location is important as well.
The alarms for PID should be more reliable; they need to be more sensitive than those based on electrochemistry or semiconductors, but the price is, as one can imagine, quite high
1. Are you an online analyzer or a gas leak detector? It wasn’t made clear; common gas detectors based on electrochemistry or catalytic combustion cannot be used for online analysis, as they usually break down after a few weeks. 2. What kind of toxic gas are you? What principle is used for detection? The right choice must be made when selecting. For example, organic materials such as toluene are flammable, but it is basically impossible to detect them using catalytic combustion testing. 3. Common combustible gases such as hydrogen sulfide and carbon monoxide can be sent to a calibration institute for testing. Other gas metrology institutes will not conduct inspections without national standards; you can only turn to the manufacturer. It can only be said that the manufacturer in charge will still conduct proper tests on you; it all depends on whether the manufacturer is professional or not. 4. The interference issue depends on the type of gas and the background gas; it is necessary to consider the sensor selection
It’s probably a problem with the sensor; you can take it to a professional testing agency for inspection.
This post was last edited by yuchenchf on 2017-6-27 at 10:58. Gas detectors generally need to be calibrated every six months