Infrared carbon dioxide sensor
CO2 gas detection module is a new type of infrared gas sensor with an electrically modulated infrared light source. The electrically modulated infrared source, heating modulation components save the traditional method; at the same time using high-precision interference filter integrated infrared thermal modulation components; at the same time, the high-precision interference filter integrated infrared sensor and the single beam wavelength suppression technique, with gilded chamber easy disassembly and data acquisition system integration, namely electric modulation nondispersive infrared (NDIR) gas sensor;
Infrared light is emitted 1-20um infrared, absorption through the chamber length narrowband filter, after a 4.26 μ m wavelength, infrared sensor by monitoring through 4.26um wavelength infrared intensity, in order to detect the CO2 gas concentration
NDIR infrared carbon dioxide sensor technology:
In the design of optical system sensor part, in order to reduce the signal attenuation and infrared sensor external signal interference, the electromagnetic shielding certain measures. In order to make the gas infrared absorption signal has better resolution, in structural design, infrared light, infrared detector, gas chamber on the same optical axis; in addition to the signal is large enough, the use of the parabolic reflector; infrared light regulated power supply, ensure the accuracy of measuring gas; infrared light source emits infrared light incident to the the gas chamber, the CO2 gas absorb certain wavelengths of infrared light, infrared sensor based on surface to obtain infrared intensity penetrating air chamber generates electrical signals corresponding to. Because the signal modulation infrared infrared sensor output through communication, high precision, low drift of the narrowband filter pre amplification circuit, a DC signal and the measured gas concentration corresponding to get into MCU. Analysis of the infrared sensor signals intelligence operations, and the digital filter, linear interpolation and temperature compensation software processing, the gas density measurement, and gives alarm signal in the CO2 gas concentration reaches the set value.
Basic parameters:
Storage temperature: -30 degrees to +70 degrees; temperature: -5 degrees to +60 degrees and the humidity of the environment: 0 ~ 95%RH;
Electrical parameters:
Working voltage: 3 ~ 3.3VDC;
Static power consumption: <1mA; detection of the instantaneous peak current: <250mA; CO2 measurement:
Measurement methods: electrical modulation nondispersive infrared (NDIR) concentration range: 0 ~ 15000ppm;
Response time: <120S;
Alarm output: level features: alarm output is "0" level (usually in the OC state), 15V/500mA; CO2: 6500ppm; CO2 concentration of initial alarm limit alarm concentration: 8500ppm;
Wiring method:
1 line: blue, power supply (GND);
2 line: red, positive input end of the working power of DC3.0V-3.3V; 3 lines: the green, alarm control line;
4 line: empty;
Test method:
After the power is switched on, the CO2 module into the pre preparatory work state, 120 seconds after the start to enter the working state, the content of CO2 every 10 seconds to detect a gas chamber module detection, alarm until the concentration of CO2 reached alarm set value; the control output is "0" level, low; low level for 0.25 seconds, stop for 5 seconds, repeat the low level for 0.25 seconds, then stop 5 seconds, repeated 5 times....., after work, module stops working, it re enters the ready state (i.e., 60 seconds to completely duplicate detection CO2 gas concentration).
------line----------------------------
- Link
-