What are the advantages and disadvantages of PID gas detectors?
What is PID gas detector? It is fully called PID light ion gas detector, the main core is by built-in PID sensor to a kind of ultraviolet lamp (UV) light source principle to react to analyze the gas concentration of the instrument. Working principle: PID uses a ultraviolet lamp (UV) light source will be organic matter into a detector can be detected by the positive and negative ions (ionization), first of all in the ionization of electrons and positively charged ions under the action of the electric field, the formation of a weak electric current, and then the PID gas detector through the detection of the current strength to reflect the content of the substance, and finally the detector to measure the ionization of the charge of the gas and will be converted to a Finally, the detector measures the charge of the ionized gas and converts it into a current signal, which is amplified and converted by the corresponding algorithm to derive the concentration and composition of the gas.
Advantageous features
1.PID gas detector for a wide range of detection, the current basic can be applied to the detection of VOC volatile organic compounds, can also be applied to emergency trace gas leakage detection. (Note: limited by the PID lamp life and susceptible to humidity characteristics, not recommended for gas online monitoring system applications)
2.PID gas detector high precision, support can detect ppb level (parts per billion) of VOC volatile organic gases, in addition to the traditional PID photoionization gas detector can detect ppm level (parts per million) of organic gases, accuracy over other infrared, electrochemical, catalytic combustion and other principles.
3.PID gas detector on the detection of gas non-destructive, good stability, the general gas detector in the gas inhalation will be ionized, and gas molecules formed by ions in the discharge and formed the original gas molecules, the original gas molecules without damage.
4.PID gas detector response speed, long life. Under normal working condition, PID gas detector can respond almost in real time and can be tested continuously. In addition, usually a UV lamp life in thousands of hours, conventional conventional PID gas detector design life up to 5 years or more.
Disadvantages: PID gas detector is relatively expensive, currently on the market for a single PID gas detection instrument price is about 8000 to tens of thousands of different, if the budget is insufficient friends, then recommend that you can consider choosing the traditional other electrochemical, infrared, semiconductor and other principles of gas detector.
Which gases are PID gas detectors suitable for?
PID gas detector is suitable for detecting VOC, TVOC, benzene, toluene, ammonia, carbon disulfide, trimethylamine, olefins, aromatic hydrocarbons, acetone, acrylonitrile, acetic acid, ethyl acetate, ethyl ether, methyl mercaptan, methyl mercaptan, styrene, vinyl chloride, and other volatile gases, but the range of VOC can be said to be quite complex, and the types of species and even up to a million kinds of many, so the use of the PID gas detector or to verify the detection range before. Therefore, before using the PID gas detector, it is still necessary to verify the detection range.
