Introduction

The 3.3V methane sensor uses tunable diode laser absorption spectroscopy (TD-LAS) technology and operates with a 1653.7nm laser to detect methane by absorbing its unique "fingerprint spectrum." It resists interference from water vapor or other gases. The combination of direct absorption and wavelength modulation, along with the "N" type optical path structure, enables an extended absorption path, ensuring high sensitivity. Its design incorporates low-temperature laser components and a temperature compensation algorithm, making it reliable in varied environments. The standard installation and communication interface enhance compatibility, making it widely suitable for methane leak detection in areas like coal mines, industrial settings, and underground spaces.

Feature

• 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

Dimensions

Technical Parameters:

Applications:

a) 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

b) 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.

Communication Interface and Definition

Interface form: SH1.0mm/4P

Cable length: 200mm

Communication Protocol

(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

Fault Code

Precautions

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.

Support and Services

Gas Detector Sensor support features expert troubleshooting and issue resolution, as well as repair and maintenance services. We provide calibration and testing to ensure accurate readings, along with product documentation and manuals. Our team can also assist with selecting and customizing the right sensor, all to ensure top performance and customer satisfaction.

Packing and Shipping:
Product Packaging:
Gas Detector Sensor unit
User manual
Mounting hardware
Calibration certificate
Shipping Information:
Expected delivery time: 5-8 business days