G40S Portable Multi-Gas Detector

G40S Portable Gas Detection Alarm

Equip your team for the gases at your site, make alarms easier to notice, and keep data for follow-up.

Detect the gases that matter
Select 1–5 target gases and measuring ranges. Common options include CH4/LEL, O2, CO and H2S; we confirm the sensor combination for your application.
Make alarms hard to miss
Audible, visual and vibration alerts warn the wearer when gas concentrations reach the configured alarm levels.
Review readings and alarms
Store up to 30,000 data records at configurable intervals, with alarm record storage for follow-up.

Natural-diffusion sampling IP68 or above protection class

Overview

G40S is a portable multi-gas detector for on-site monitoring of 1–5 selected gases. Choose target gases and measuring ranges for the job; common options include CH4/LEL, O2, CO and H2S. The final sensor combination and ranges are confirmed for each configuration.

Natural-diffusion sampling measures the air around the instrument. The display shows readings, while audible, visual and vibration alarms notify the wearer at configured alarm thresholds. Alarm records and adjustable data storage support follow-up. If your task requires remote pre-entry sampling, ask us about a suitable solution.

Key Features

Alarms & Safety

Triple Alarm (Audible, Visual & Vibration)
Customizable Alarm Setpoints
Multiple Alarm Modes (High/Low, TWA, STEL)
Fall Detection Alarm
Sound, light and vibration alarm, under-voltage alarm, fault alarm; fall alarm, call for help alarm, one-key call for help
Multiple alarm mode Settings: low alarm, high alarm, interval alarm, TWA, STEL

Connectivity & Data

Alarm Record Storage
WIFI & Bluetooth Data Upload
PC Data Upload
It can be connected with portable detector, and supports interconnection with the same machine
Support 4G upload; support Beidou GPS positioning(Optional)
Bluetooth, WiFi and other wireless communication methods
It can store 30,000 pieces of data with configurable storage time interval and mode

Operation & Calibration

The screen supports 0° and 180° flip for easy viewing
Type-C charging port, more convenient
Multi-level calibration, zero point automatic tracking; factory setting can be restored,concentration calibration error operation automatic identification and prevention
Switchbetween Chinese and English interfaces
Unitfree switching

Technical Specifications

Detection gas	combustible/gas/toxic and harmful gas/oxygen, etc
Sampling method	natural diffusion
Response time	less than 30s
Environmental temperature	-25℃~+55℃
Relative humidity	(20~93)%
Display mode	LCD display
Power supply voltage	DC 3.7 V
Battery capacity	3000 mAh lithium ion rechargeable battery
Charging time	<5 h
Working time	> 12 h (continuous)
Explosion-proof mark	Ex ia ⅡC T4 Ga/Ex ia ⅢCT200130℃ Da
Protection class	IP68 or above
Product weight	approximately 210 g
Pressure limit	86kPa~106kPa
Size	L120mmxW56mmxH31mm

Videos

Available Gases & Detection Ranges

The gases and ranges below are configuration options. G40S monitors 1–5 selected gases; confirm the final sensor combination and ranges with our team.

Common Gas Parameter listing
Gas detected	Measuring Range	Optional Range	Resolution Rat	Response Time
LEL -combustible gas	0-100%LEL	0-100%VOL (Infrared or catalytic )	1%LEL/1%vol	≤10s
carbon monoxide	0-1000PPm	0-500/2000/5000PPm	0.1/1PPm	≤10s
TVOC	0-100PPM	0-100PPM	0.1PPm/1PPM	≤15s
hydrogen	0-100%LEL	0-1000PPM	1%LEL/1PPM	≤15s
natural gas	0-100%LEL	0-100%LEL	1%LEL	≤10s
Oxygen-O2	0-30%VOL	0-30%、0-100%VOL	0.1%vol	≤10s
ozone	0-10PPm	0-20、100PPm	0.01PPm/0.1PPM	≤15s
hydrogen sulfide-H2S	0-100PPm	0-50、200、1000PPm	1/0.1PPm	≤10s
Methane-CH4	0-100%LEL	0-100%VOL	1%LEL/1%vol	≤10s
fluorine	0-10PM	0-1、10PPM	1/0.1PPm	≤15s
hydrogen chloride	0-20PPm	0-20/50PPm/100PPM	0.01/0.1PPm	≤15s
Nitrogen-N2	0-30%VOL	0-30%VOL、100%VOL	0.1%LEL/1PPM	≤10s
hydrogen	0-100%LEL	0-1000PPm	1%LEL/0.1PPm	≤15s
chlorine	0-20PPm	0-10、100PPm	0.1PPm	≤15s
ammonia gas	0-100PPm	0-50、500、1000PPm	1/0.1PPm	≤15s
oxynitride	0-20PPm	0-50、1000PPm	0.1/1PPm	≤15s
methanal	0-20PPm	0-50、100PPm	1/0.1PPm	≤15s
sulfur dioxide	0-20PPm	0-50、1000PPm	0.1/1PPm	≤15s
nitric oxide	0-250PPm	0-500、1000PPm	1PPm	≤15s
nitrogen oxide	0-20PPm	0-50、1000PPm	0.1/1PPm	≤15s
phosphine	0-20PPm	0-20、100PPm	0.1PPm	≤15s
acrylonitrile	0-100PPM	0-100PPm	0.1/1PPm	≤15s
carbon dioxide	0-5000PPm	0-1%/5%/10%VOL(Infrared )	1PPM/0.01%VOL	≤15s
hydrogen fluoride	0-10PPm	0-1、10、50、100PPM	0.01/0.1PPm	≤15s
Xylene/methylbenzene	0-20PPm	0-5、10、50、100PPm	0.01/0.1PPm	≤15s
oxirane	0-100PPm	0-100PPm	1/0.1PPm	≤15s
For other gases and measuring ranges, please contact us directly!
Note: Not all gases and range are listed, if you need more information, please contact us.

Request a Quote

Tell us your target gases, measuring ranges, application, operating environment and quantity. G40S uses natural-diffusion sampling; if you need remote pre-entry sampling, mention it so we can recommend a suitable solution.