Introduction

This 3.3V methane sensor, developed using TD-LAS technology, leverages a 1653.7nm laser to detect methane based on its characteristic absorption spectrum. It is immune to interference from water vapor and other gases. The sensor combines direct and wavelength modulation absorption techniques with an "N" type optical design, providing a long optical path and superior sensitivity. Low-temperature laser and photodetector devices are used along with a temperature compensation algorithm to ensure strong environmental adaptability. With its standard thread installation interface and communication protocol, it’s highly versatile. It’s used as the core part of methane gas monitors for spaces like underground areas, restaurants, industrial sites, and coal mines.

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

We provide technical support for Gas Detector Sensors, including expert help for resolving issues and troubleshooting, as well as repair and maintenance services. Our calibration and testing services ensure accuracy, and we offer product documentation and manuals. We also assist in product selection and customization, aiming to provide the best support to keep your detectors working efficiently.

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