VOCdetectorPI-700

VOCIt is one of the important causes of haze weather, but VOC emissions are different from sulfur dioxide and nitrogen oxides. Their emission sources are dispersed and widely exist in fields such as petrochemicals, automotive spraying, and printing, which puts forward innovative regulatory requirements and challenges VOC control technology. Therefore, more market participation is needed. Zhao Hualin, Director of the Pollution Prevention Department of the Ministry of Environmental Protection, also called on at the 13th China Environmental Protection Exhibition that the society's attention to volatile organic pollutants is not enough. The amount of this pollutant exceeds that of sulfur dioxide and nitrogen oxides, which is a prerequisite for the formation of PM2.5 and ozone and poses a great threat to human health. Therefore, it should be highly valued by the whole society.

To further promote the prevention and control of volatile organic compound pollution, the Ministry of Environmental Protection will launch pilot projects for VOCs pollution control in chemical industrial parks, and carry out LDAR (leak detection and remediation) technology pilot projects in key industries such as petrochemicals and chemicals.

The PI-700 VOC detector produced by DeKang Corporation in the United States is suitable for daily concentration monitoring in key industries such as petrochemicals and chemicals.

Photoionization benzene gas detector

Photo ionization detectors (PID) can detect extremely low concentrations (0-5000 ppm) of volatile organic compounds (VOCs) and other toxic gases. Many harmful substances that cause accidents are VOCs, so PID, which has the highest sensitivity for VOC detection, has an irreplaceable use in emergency accident detection. Detcon's recent breakthrough development in PID technology includes making the instrument more robust and reliable, making it a universal tool for detecting organic compounds. It is precisely these developments that will make PID detectors an instrument for environmental monitoring.

What is PID technology?
Photoionization detectors can measure VOCs and other toxic gases at concentrations ranging from 0.1 to 5000 ppm. PID is a highly sensitive wide range detector, which can be seen as a 'low concentration LEL detector'. If toxic gases and vapors are seen as a river, even if you swim into the river, the LEL detector may not react yet, while the PID informs you just when your feet are wet.

PIDHow does it work?
PIDA ultraviolet (UV) light source was used to ionize organic matter into positive and negative ions that can be detected by a detector. The detector measures the charge of ionized gas and converts it into a current signal, which is amplified and displays the "PPM" concentration value. After being detected, the ions recombine into the original gas and vapor. PID is a non-destructive detector that does not "burn" or alter the gas being tested, so that the gas detected by PID can still be collected for further measurement.

PIDCan we really measure those substances?
A large number of organic compounds containing carbon can be detected by PID. including:

• Aromatic compounds: a series of compounds containing benzene rings, such as benzene, toluene, naphthalene, and so on.
• Ketones and aldehydes: compounds containing C=O bonds. For example: acetone, etc
• Ammonia and amines: N-containing hydrocarbons. For example, dimethylamine and so on.
• Halogenated hydrocarbons: Thiohydrocarbons:
• Unsaturated hydrocarbons: olefins, etc
• alcohols
• Inorganic gases without carbon: ammonia, arsenic, selenium, bromine and iodine, etc.
  

What is the correction coefficient of PID detector?
The correction factor (CF, also known as the response factor) is a parameter that needs special attention when using PID detectors. They represent the sensitivity of measuring specific gases using PID. It is used to calibrate PID with one gas and directly obtain the concentration of another gas through CF, thereby reducing the trouble of preparing many standard gases.

1. CFThe value represents the sensitivity of the measurement
   The lower the CF value, the higher the sensitivity of the gas or vapor. The CF value of benzene is 0.50, and its detection sensitivity is approximately 18 times that of ethylene with a CF of 9.9. Normally, PID can effectively measure various substances with CF below 10. DETCON company can provide users with CF tables for various substances, and also store CF values for some common substances in the microprocessor of the instrument.
   2) When measuring pure gases, the sensitivity of the instrument can be adjusted using CF.
   The correction coefficient directly obtains the concentration of the gas to be measured by comparing it with the correction gas. For example, the sensitivity of benzene is approximately twice that of commonly used calibration gases (CF=1.00).

PI-700Benzene gas detector

DETCONThe company's Model PI-700 detector is an "intelligent" detector that usesPhotoion detection technology monitors volatile organic compound (VOC) gases in the range of 0-1 ppm to 0-5000 ppm in the air. In the design of the PI-700 detector, a new generation of intelligent products has been developed by inheriting the traditional advantages of DeKang products and integrating several technologies. This product is particularly suitable for harsh industrial environments. The detector is designed with a 316SS electropolished stainless steel casing, multi-layer peak voltage protection circuit, and 100% epoxy resin encapsulated electronic components to ensure the sealing of electronic components and prevent damage from external moisture and corrosive gases. The gas detector component is plug and play and can be easily replaced on site. The operating interface is interference free and only requires a magnetic rod to operate the menu. Software settings and daily calibration can also be operated through menu guidance, which is very intuitive and concise. The detector is equipped with an LED screen that can display the current concentration reading of the gas, as well as fault information and sensor status. Its output is 4-20mA analog signal and Modbus RS-485 digital signal, which complies with SIL2 safety level.

Technical Specifications