★useintegrationdigitPoint type laser methane sensing probe;

★ Can output signals of different formats according to different needs;

★ Integrated sound and light alarm.

IIIProduct advantages

Compared to several gas technologies, laser gas detection and alarm products have significant advantages:

（1) Longer lifespan
Conventional semiconductor and catalytic combustion applications have a lifespan of 1-2 years, while laser gas alarm detectors have a lifespan of 5-10 years. The length of their lifespan is mainly due to the different sensing methods they use. The core components of semiconductor and catalytic combustion are slowly deteriorating and aging, and their application lifespan can generally reach more than a year. The laser gas alarm detector adopts optical measurement technology, and the sensor does not undergo chemical reactions with the gas, greatly extending its lifespan.

（2) No cross infection between different gases, better environmental adaptability
Due to chemical reactions, electrochemical/thermal catalytic sensors react with the same type of gas without unique selectivity, often leading to false alarms. Both infrared sensors and laser sensors detect infrared light by absorbing it by the target gas, but infrared sensors can only achieve relatively weak resolution. Infrared sensors filter thermal radiation sources through interference filters to select appropriate wavelengths. The spectral resolution of this filter is approximately one thousand times weaker than the laser resolution in the tunable diode laser spectrum. Overlapping gas absorption spectral bands can cause serious problems for infrared sensors, especially the frequently present moisture absorption band. For laser sensors, this problem no longer exists and there is zero cross sensitivity. Laser sensors have stronger environmental adaptability. When detecting the presence of hydrogen sulfide and chloride in gases, catalytic combustion alarms should not be selected; Semiconductor alarm devices are not suitable for environments with large temperature differences and high precision requirements.

（3) Easy to adjust
Due to the sensitivity of chemical reactions to humidity, temperature, pressure, and environmental gases, electrochemical/thermal catalytic sensors often suffer from zero drift due to various reasons, resulting in extremely short calibration cycles. Frequent calibration greatly increases the cost of using sensors purchased at low prices. Laser sensors are not affected by pressure and humidity changes under normal pressure conditions and require no calibration.

（4) High dynamic range
Most detection technologies can only detect low concentrations of gases (e.g. electrochemical sensors detect concentrations below 100ppm), or can only detect high concentrations of gases (thermal catalytic sensors detect concentrations within a percentage range). In many practical applications, a high dynamic measurement range is necessary. If chemical sensors are used, different measurement range sensors need to be installed, which increases costs and is inconvenient to use. The measurement dynamic range of laser gas sensors is as high as ten thousand times, which can meet the needs of most testing ranges without using two or three different detection techniques in the same device.

Comparison of several common technologies

4Technical parameters:

5Characteristic specifications

Ø High precision, miniaturization, low power consumption;

Ø Effectively absorbing optical path length, achieved in small optical systemsEffective absorption path length of 9cm;

Ø High reliability, intrinsic anti-interference (non methane gas has no reaction);

Ø 5.0V power supply TTL serial port, convenient for secondary integration;

Ø Intrinsic safety explosion-proof design,EMC protection design;

Ø Waterproof and dustproof design;

VIapplication area

Ø Petroleum, chemical, mining;

Ø Natural gas pipelines, transmission stations, and refueling stations;

Ø Coal mine safety monitoring;

Ø Pipeline leakage monitoring and household natural gas leakage monitoring;

Ø Underground comprehensive pipe gallery, gas leakage monitoring, biogas monitoring;

Ø Other related fields of safety supervision and testing;

7Product model and meaning:

GT - SY- 2□00

G Representing point type combustible gas detectors for industrial and commercial purposes

T Representing combustible gases

SYRepresentative enterprise code

2 Representative product serial number

□ doAt 0 o'clock, it represents the principle of catalytic combustion

doAt 1 o'clock, it represents the infrared principle

doAt 2 o'clock, it represents the principle of laser

00 Representative Design Number

The explosion-proof type of the product is: explosion-proof type, marked asEx d Ⅱ C T6 Gb.

Product execution standards:GB 3836.1-2010、GB 3836.2-2010、GB14048.1-2012、GB4208-2017,GB/T50493-2019,GB15322-2019。