Infrared Methane Gas Transmitter CJH Series

Product catalog summary

Introduction
The Infrared Fixed CH4 Gas Transmitter by Wuhan Cubic Optoelectronics Co., Ltd integrates advanced NDIR technology with high-quality components. It is designed for gas detection in refrigerators and hazardous underground areas in coal mining, offering ease of operation and reliable monitoring.

Key Features

Proprietary infrared gas analysis technology ensures high accuracy, resolution, and longevity.
Equipped with high and low alarm settings, featuring audio and light alerts.
Automatic zero calibration and diffusion-type sampling methods.
Fast response time and immunity to 'poisoning'.
Real-time gas concentration display via LED and audible alarms for safety.
Durable metal casing suitable for industrial online monitoring.

Specifications

Measuring Method: NDIR
Power Supply: DC 8-25V
Range: 0-5%vol to 0-100%vol
Resolution: 0.01% for 0-5%vol, 0.1% for 0-100%vol
Display: 4-digit LED
Max Error: ≤±0.1% for 0-1%, ≤±10% for 1-100%
Response Time: T90 < 25s
Zero Repeatability: ±1%FS at 20℃
Zero Drift: 1%/month
Working Temperature: -40℃ to 70℃
Storage Temperature: -40℃ to 85℃
Warming Time: 30s
Output: Digital RS485, Analog 4-20mA
Humidity: 0-95% RH non-condensing
Alarm Settings: Low alarm at 20% LEL, high alarm at 50% LEL, adjustable
Lifetime: >5 years
Sampling Method: Diffusion

Applications
The transmitter is suitable for point-source hazards and perimeter protection in challenging environments. It provides safety protection against methane gas risks in various industrial applications, including petrochemical processing, mining, fuel gas transport, power generation, gas storage, marine operations, and telecommunications.

Installation

A remote controller is used for zeroing, alarm setting, and adjustments.
Installation height depends on the gas weight ratio; typically 30cm from the ceiling for gases lighter than air.
Placement is determined by potential leakage sources and working structure, with specific guidelines for indoor and outdoor detection probe radii.
Power supply connections and installation require expansion bolts, with detailed terminal definitions provided.

Instrument Configurations

Gas Transmitter CJH-5
Remote Controller for operation
Calibration Cover for calibration
Expansion Bolt for equipment installation

Catalog excerpts

Infrared Methane Gas Transmitter CJH Series-1

INFRARED (NDIR) FIXED CH4 GAS TRANSMITTER Wuhan Cubic Optoelectronics Co. Ltd Add:Fenghuang No.3 Road, Fenghuang Industrial Park,Eastlake Hi-tech Development Zone,Wuhan 430205, China Tel: 86-27-81628831 Fax: 86-27-87405251 www. GasSensor.com.cn

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Infrared Methane Gas Transmitter CJH Series-2

WUHAN CUBIC Ot*TQtLJ6CTKQM*C5 CO^Ll D. leading NDIR technology coal mining. This operation and meet your monitoring demands.

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Infrared Methane Gas Transmitter CJH Series-3

■ Proprietary infrared gas analysis technology, with high accuracy, high resolution, long life and easy ■ High and low alarm settings, two levels of audio and light alarms; ■ Automatic zero calibration with ■ Fast response and Immune from ■ Audible alarm device to prevent accidents and ensure the safety of ■ Metal case for industrial online WUHAN CUBIC OrMUfcLfcCThvJr*iCi> CU,. I L.. 1 - Power cord port

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Infrared Methane Gas Transmitter CJH Series-4

SPECIFICATION Measuring method Power supply Measurement range:0-5%vol, resolution is 0.01%; Measurement range:0-100%vol, resolution is 0.1%; For range 0-1%,≤±0.1%; For range 1-100%,≤±10% of reading Zero repeatability Zero drift Working Temp Storage Temp Warming time Digital: RS485, 2 way TTL level; Analog : 4 ~ 20ma Setting Alarm Default: low alarm 20% LEL, high alarm 50%LEL, user adjustable Sampling method Diffusion sampling

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Infrared Methane Gas Transmitter CJH Series-5

APPLICATION CH4 Fixed gas transmitter for point-source hazards and perimeter protection in arduous duty and exposed locations. Safety protection for methane gas risk occurring in hazardous areas and general industrial applications: Petrochemical processing. Mining, metallurgy Fuel gas transport, as well as the leakage of nature gas Power generation. Gas storage and distribution. Marine and cargo handling. Telecommunications, oil wells.

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Infrared Methane Gas Transmitter CJH Series-7

Transmitter mounting height is decided by the measured gas weight ratio. If the measured gas is less than air, the transmitter is usually installed in the up place, 30cm from the ceiling; if the ceiling is high (higher than 5 meters), the proper installation height should be considered by the gas leakage speed; Transmitter installation place is determined by gas leakage source and working structure. 1) Firstly to check the area of working place and possible leakage points to determine required quantity of gas detector. In general, the detection probe radius of 7.5 m indoor; outside radius of...

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