A little bit about gas detectors
1. Can the fixed combustible gas detector be made into a two-wire wiring method?
No, the two-wire signal and power supply share one wire, 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 "Design Specifications for Detection and Alarms of Combustible and Toxic Gases 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. One detector can be installed within the effective coverage area. The distance between the toxic gas detector and the release source, It should not be larger than 2m outdoors and 1m indoors."
3. What are the regulations on the installation height of fixed gas detection alarms?
According to the "Design Specifications for Detection and Alarms of Combustible and Toxic Gases in Petrochemical Enterprises" (SH3063-1999):
"6.1.1 Detectors that detect flammable gases or toxic gases that are heavier than air should be installed at a height of 0.3 to 0.6m from the floor (or floor).
Note: A gas density greater than 0.97kg/m3 (under standard conditions) is considered heavier than air; a gas density less than 0.97kg/m3 (under standard conditions) is considered lighter than air.
6.1.2 Detectors that detect flammable gases or toxic gases that are lighter than air should be installed 0.5 to 2m higher than the release source. "
4. What kind of standard gas is used to calibrate the combustible gas detector?
According to the provisions of "Combustible Gas Detection Alarm" (JJG693-2004):
"5.1.2.1 Gas standard material Use the same standard material as the gas to be measured. For general-purpose instruments, isobutane or propane gas standard material can be used."
The company uses isobutane for calibration.
5. What is the detection principle of catalytic combustion?
The principle of catalytic combustion is to prepare a high-temperature resistant catalyst layer on the surface of a platinum resistor. At a certain temperature, flammable gas catalytically burns on its surface. The combustion causes the temperature of the platinum resistor to increase, causing the resistance to change. The change value is a function of the concentration of the flammable gas. function.
6.What does F.S stand for?
F.S is the acronym for full scale. It indicates the size of the measurement range.
7. What kinds of display screens are currently on the market and what are their characteristics?
Currently, there are light-emitting diodes (LED), liquid crystal displays (LCD) and organic light-emitting displays (OLED) on the market.
