Common gas sensors and introduction

Common gas sensors and introduction
JXCTTime:2022-9-21

Different application areas of gas sensors

The application of gas sensor in the civil field is mainly reflected in: in the kitchen, the detection of natural gas, liquefied petroleum gas, city gas and other civil gas leakage, through the detection of gas automatic control microwave oven cooking in the microwave oven when cooking food; Houses, buildings, meeting rooms, public entertainment places use carbon dioxide sensors, smoke sensors, ozone sensors, etc., to control the automatic operation of air purifiers or electric fans; In some high-rise buildings, gas sensors can also be used to detect fire signs and alarms.

In the industrial field, gas sensors are mainly used in the petrochemical industry. Some carbon dioxide sensors, ammonia sensors, nitric oxide sensors, etc., can be used for specific applications to detect harmful gases such as carbon dioxide, ammonia and chlorine. In addition, it can also be used to detect organic solvents and phosphoane and other toxic gases in semiconductor and microelectronics industries; In the electric power industry, hydrogen sensors can detect hydrogen produced during the deterioration of power transformer oil; In the food industry, gas sensors can also detect the freshness of perishable foods such as meat; There is also a wide range of demand for the detection of oxygen in the exhaust gas of automobile and kiln industries, and the detection of ethanol concentration in the breath of drivers in highway traffic.

Common fixed gas sensor:

1.Explosion-proof – stationary gas sensor

Explosion-proof gas sensors are specially developed for some harsh environments. Cast aluminum explosion-proof shell, the probe is placed in a special metal probe bin, the electrical part is isolated from the probe. The professional sulfur dioxide concentration sensor probe is used as the core detection device. It has the characteristics of wide measuring range, high precision, good linearity, good universality, easy to use, easy to install, long transmission distance, moderate price and so on.

Parameters:
Measurement range: 0-2000ppm
Measurement method: electrochemical sensor
Communication port: RS485
Power supply: 12-24V DC
Baud rate: 2400/4800/9600
Measurement accuracy: 3%F.s
Response time: (T90, seconds) : less than 15
Power consumption: ≤1W (@12V DC,25℃)

2.Fixed sensor – wall mounted sensor

Fixed gas sensor adopts professional test gas concentration sensor probe as the core detection device; It has the characteristics of wide measuring range, high precision, good linearity, good universality, easy to use, easy to install, long transmission distance, moderate price and so on. Can be connected to use alone, first use 12V DC power supply, the equipment can be directly connected with 485 interface PLC, can be connected through the 485 interface chip single chip. Through the MODbus protocol specified in the following, SCM and PLC can be programmed to cooperate with the sensor.

Parameters:
Measurement method: electrochemical sensor
Communication port: RS485
Power supply: 12V-24V DC
Baud rate: 2400/4800/9600
Measurement accuracy: 3%F.s
Response time (T90, seconds) : less than 15
Power consumption: ≤0.15W (@12V DC, 25℃)

3.Portable gas detector

Portable gas detector adopts the latest digital integrated circuit technology and international gas detection technology, is a new intelligent gas detector. The use of large size full-color LCD real-time display reading, the probe to select well-known brands in the industry manufacturers probe, relying on several years of gas transmitter research and development experience, the use of mature and stable long-life probe solution.

Parameters:
Measurement method: electrochemical/infrared/catalytic combustion /PID photoion/semiconductor/thermal conductivity etc
Response time: T90<30 seconds
Operating temperature: -20°C to 50° C
Operating humidity: 95%RH without condensation
Power supply: 3.6VDC,1500mAh(standard) lithium battery
Display mode: 2.2 inch LCD screen