Compact Methane Laser Sensor with 0.2% VOL Detection Limit for Industrial Safety

Developed using TD-LAS, the 3.3V methane sensor relies on a 1653.7nm laser to detect methane via its distinctive "fingerprint spectrum" absorption, offering resistance against interference from water vapor or other gases. By merging direct absorption and wavelength modulation techniques with an "N" type optical structure, it achieves a long absorption path, high sensitivity, and precision. The low-temperature laser and photodetector, paired with a temperature compensation algorithm, enhance its environmental adaptability. Its standard communication and installation features make it broadly compatible for methane monitoring in industrial, mining, and underground applications.

• High detection accuracy
  Direct and wavelength modulation technology combined with folded optical path design, measurement error ≤±6% true value @25℃

• Good environmental adaptability
  Wide temperature compensation correction algorithm, can meet -40~+70℃ application

• Strong anti-interference
  Methane "fingerprint spectrum" laser absorption detection technology, anti-poisoning, anti-water vapor and other gas interference;

• Strong structural protection
  Stainless steel material design, meets the explosion-proof level Exia IIC T6 Ga

• Low cost
  Long service life, low power consumption, modular design, easy to integrate

1. The sensor continuously outputs the measured methane concentration, measured temperature, measured pressure, laser signal strength, laser operating temperature and fault code through the standard TTL serial port
2. It has a self-test function, which can detect whether the laser, photoelectric detector and voltage stabilization sensor are normal, which helps to eliminate the fault point.

Interface form: SH1.0mm/4P

Cable length: 200mm

(1) Communication interface configuration

UART serial port: Baud rate: 115200, data bits: 8 bits,

Stop bit: 1 bit, parity bit: no check

(2) Description of communication protocol

After the sensor is powered on, it goes through a period of preprocessing (6-10s) and then begins to periodically (1Hz) output a fixed-length string. The string format is shown in the figure above.

Output string parsing (sample):

A 000.00 + 24.0 + 1006.22 + 16.1 + 006.0 B 00 13

A: the frame head;

+000.00: methane concentration value, two decimal places reserved, unit %vol;

+ 24.0: the environment temperature, the unit ℃;

1006.22: the environment pressure, the unit hPa;

16.1: the laser light intensity and effective range 3.6 21.6;

006.0: magnification factor, normal range 1.0-126.0;

00: fault codes

01: abnormal optical signal; 02; Ambient temperature or abnormal pressure; Optical signal is too strong; 04 laser temperature anomaly;

05: light signal is too weak;

13: xor check code

a) The working voltage of the sensor is 3.3V, and the serial interface level is 3.3V;

b) sensor contains precision optical components, please avoid violent collision;

c) Working environment conditions: -40℃ ~ +70℃

d) Relative humidity 0-99% RH (non-condensation).

Note: The working voltage of the sensor is 3.3V. It is forbidden to connect the power supply voltage exceeding 3.6VDC to the sensor to avoid damage to the sensor.

Gas Detector Sensor technical support includes expert assistance for trouble and resolving issues, repair and maintenance services, and calibration and testing to guarantee accurate performance. We offer product manuals and documentation, along with guidance for product selection and customization. Our goal is to deliver exceptional support, ensuring your gas detectors work effectively.

Product Packaging:
Gas Detector Sensor unit
User manual
Mounting hardware
Calibration certificate

Shipping Information:
Expected delivery time: 5-8 business days