Gas detection:	Combustible gases, hydrogen sulfide, carbon monoxide, oxygen (the principle of combustible gases is catalytic combustion, and the other three are electrochemical principles)
Extended gas:	1-4Various types of sensors can be combined with different gases. For specific sensor parameters, please refer to the relevant gas detector
Detection method:	Pump suction and diffusion options available
Measurement range:	Detect gas range accuracy MINIMUM READING response time Combustible gas（EX）0-100%LEL＜±3%(F.S) 1%LEL ≤20second Carbon monoxide（CO）0-500ppm＜±3%(F.S) 0.1PPM ≤20second Hydrogen sulfide（H2S）0-100 ppm＜±3%(F.S) 0.1PPM ≤20second oxygen(O2) 0-30%VOL＜±3%(F.S) 0.1%VOL ≤15second
Linear error:	≤±1%	Recovery time:	≤20second
Display mode:	LCDLCD backlit display	Alarm method:	Sound and light level 2 alarm,≤90decibel
Detection method:	Pump suction(Diffusion type)Two options for detection in different situations
Menu display:	English operation menu
Automatic diagnosis:	System check: Battery level, display, sensor, hardware malfunction
Protection level:	IP65	Working temperature:	-40℃～+70℃
Explosion proof grade:	Exia II CT6(Intrinsic safety type)	Working humidity:	≤95%RHNo condensation
Size:	126mm(Long)×66mm(Width)×33mm(Thick)	working pressure:	≤100Kpa
Weight:	300g(with aluminum-plastic panel box)	Working power supply:	3.7VLithium ion rechargeable battery, ultra long standby time
Related accessories:	Special instrument aluminum box, manual, certificate of conformity, charger (with external pump and sampling handle)

PN-M4 composite gas detector is suitable for detecting the concentration of various mixed gases in various industrial and special environments. The instrument adopts imported electrochemical/infrared gas sensors and microcontroller technology, with fast response speed, high measurement accuracy, good stability and repeatability, and the overall performance is at the leading level in China. It is an inherently safe device for continuous detection of gas concentration, with a large capacity nickel hydrogen rechargeable battery and ultra long standby inside; Surface mounted packaging, reliable and aesthetically pleasing; Digital LCD backlit LCD screen display, clear and intuitive; Equipped with a two-level sound and light alarm function, it can provide timely, accurate, and intuitive alarm prompts for preset alarm concentrations; The appearance of the instrument is made of special high-strength ABS engineering plastic, with a stylish design that is beautiful, has a good hand feel, and is durable.
A composite gas analyzer is a flexible single or multiple gas detector that can be equipped with oxygen sensors, combustible gas sensors, and optional two toxic gas sensors or optional four toxic gas sensors or optional single gas sensors. The instrument has the advantages of fast response speed, good stability, high sensitivity, small size, light weight, and easy portability. At the same time, it is equipped with a gas sampling pump for more accurate and fast measurement results. Widely used in fields such as petrochemicals, industrial production, environmental monitoring of flue gas and exhaust, sewage treatment, biopharmaceuticals, home environmental protection, school laboratories, etc.
*The whole machine has a small volume, light weight, waterproof, dustproof, explosion-proof, and shockproof design
*Safety reminder: Regular flashing lights and sound prompts
*Using high-capacity lithium rechargeable batteries, it can work continuously for a long time
*Digital LCD backlight display, sound and light, vibration alarm function
*The sensor adopts imported original electrochemical sensors with world-class level
*The upper and lower limit alarm values can be set arbitrarily, and it comes with zero and target point calibration functions. The outstanding audio sound alarm ensures that dangerous gases can be detected even in very unfavorable working environments and timely prompts operators to prevent them
*Large screen display of numbers, characters, instantaneous values, peak values, and minimum values

*The shell is made of special materials and processes, which are not easy to wear and tear, easy to clean, and bright as new after long-term use

*Gas, petrochemicals, metallurgy.
*Environmental protection and fire safety testing.
*Dangerous chemical gas detection.
*Municipal, school, hospital, and factory environmental testing.