1. Can the fixed combustible gas detector be made into a two-wire connection mode?
No, the two-wire signal and power supply share the same line, and the maximum working current provided is 20mA, while the working current of the combustible gas sensor is 80mA, which cannot meet its normal working current.
2. How is the effective detection range of a fixed gas detector defined?
According to the regulations in the "Monitoring of Combustible Gas and Toxic Gas in Petrochemical Enterprises" (SH3063-1999): "3.0.8 The effective coverage horizontal plane radius of the combustible gas detector should be 7.5m indoors and 15m outdoors. In the effective coverage area A detector can be installed inside. The distance between the toxic gas detector and the release source should not be greater than 2m outdoors and 1m indoors.
3. What are the requirements for the installation height of the fixed gas detection alarm?
According to the "Design Specification for the Detection and Alarm of Combustible Gas and Toxic Gas in Petrochemical Enterprises" (SH3063-1999): "6.1.1 The detector for detecting combustible gas or toxic gas heavier than air should be installed at a height from the ground (or building). Floor) 0.3-0.6m; 6.1.2 The detector for detecting combustible gas or toxic gas lighter than air should be installed at a height 0.5-2m higher than the release source. Note: The gas density is greater than 0.97kg/m3 (under standard conditions) If the gas density is less than 0.97kg/m3 (under standard conditions), it is considered lighter than air.
4. What standard gas is used to calibrate the combustible gas detector?
According to the regulations in "Combustible Gas Detector and Alarm" (JJG693-2004): "5.1.2.1 The gas standard substance uses the same standard substance as the gas to be tested, and isobutane or propane gas standard substances can be used for general-purpose instruments."
5. What do the letters in the explosion-proof grade ExdⅡCT6 mean?
Ex is an explosion-proof public mark, d represents flameproof (electrical equipment with flameproof enclosure) Class II electrical equipment for explosive gas environments except coal mines and underground, C refers to ignition energy uj, T6 refers to temperature group No, the T6 level is 85 degrees.
6. Which gases can be detected by the gas detector based on PID photoionization detection principle?
The photoionization gas sensor (PID) is the most convenient and sensitive detection method for the detection of volatile organic compounds (VOCs), especially for gas leakage with very low concentration. It has an incomparable advantage over other types of sensors. Generally speaking, photoionization gas Sensors (PID) are mainly used for the detection of volatile organic compounds (VOCs), these volatiles include:
Aromatics: benzene, xylene, naphthalene, etc.;
Saturated and unsaturated hydrocarbons: octane, ethylene, cyclohexane, etc.;
Ketones, aldehydes, ethers: acetone, propionaldehyde, propyl methyl ether, etc.;
Halogenated hydrocarbons, thiohydrocarbons, alcohols, esters, hydrazines, etc.
In addition, detectable inorganic substances include: arsenic and ammonia.
Huanfan Instrument CO, LTD develops and manufactures many kinds of gas detectors since year 2003,portable and fixed,4-20mA and RS485 are all available,for more details please contact us at any time,thank you.Email: sallie@huafankj.com
