Laser Methane Sensor Probe (MGLD2170-G)

Product Overview
The integrated point-type laser methane sensor probe utilizes Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology for precise target gas measurement. It integrates advanced lasers and detectors for high-precision, high-density, and high-reliability miniaturized packaging. The sensor probe features an open gas exchange method and proprietary technology for optoelectronic isolation, ensuring intrinsic safety. Its advanced optical system and algorithms enable high-difficulty precise measurements, resulting in high detection accuracy, fast response, and low power consumption.

Typical Applications
Petroleum, chemical industry, mining; natural gas pipelines, substations, gas refueling stations; coal mine safety monitoring; pipeline leak monitoring and household natural gas leak monitoring; underground integrated pipe corridors, gas leak monitoring, biogas monitoring; and other related safety supervision and detection fields.

Product Attributes

• High precision, miniaturized, low power consumption
• Long effective absorption optical path in a small optical system
• High reliability, intrinsically anti-interference (no reaction to non-methane gases)
• Wide working voltage range (3.3V5.0V)
• TTL serial port for easy secondary integration
• Intrinsically safe explosion-proof design, EMC protection design
• Waterproof and dustproof design

Communication Format
When the probe is in detection status, it outputs an ASCII fixed-length string of 29 bytes. The format is: +xxx.xx nn.n pppp.pp SS HH<CR><LF>

• +xxx.xx: Concentration, unit %VOL, range +000.00+999.99
• nn.n: Temperature, unit , range -99.9+99.9
• pppp.pp: Gas pressure, unit mbar, range 0000.009999.99
• SS: Product status code
• HH: XOR checksum of the first 25 bytes, output as 2 characters
• <CR><LF>: Carriage Return and Line Feed

Communication Protocol Settings

• Baud Rate: 115200
• Data Bits: 8
• Stop Bit: 1
• Parity Bit: None

Status Code Explanation
The status code (23rd and 24th bytes) indicates the probe's working status. Converting the ASCII status code to BCD format, where the 23rd byte forms the high 4 bits and the 24th byte forms the low 4 bits, results in an 8-bit flag. Each bit represents a specific fault.

• 00: Product working normally.
• 02: Absorption peak deviation.
• 44: Temperature control abnormal, and light intensity too high.
• 7A: Temperature control abnormal, temperature/pressure sensor communication abnormal, product not calibrated, light intensity too low, absorption peak deviation.