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GMJA400-S-CP Composite Gas Detection Module
Detection Modules

GMJA400-S-CP Composite Gas Detection Module

GMJA400-S-CP

Composite module in a machined aluminium housing: one to six gases, with temperature and humidity on request.

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Overview

The CP is the composite variant of the Anhe series, in a machined aluminium housing. It takes one to six gas channels on a single board and adds temperature and humidity where the application needs them.

Diffusion and flow-through sampling are both available, so the same module can sit in an open ambient enclosure or be plumbed into a sample line. Outputs cover RS485, UART, WiFi and Bluetooth, and the wide 3.3-24 V input lets it drop into 12 V and 24 V systems without an extra regulator.

As with the rest of the series, calibration is finished before shipment. The integrator gets engineering units over a documented protocol on the first day of the build.

Specifications

Values below are for the standard configuration. Gas, range, sampling mode, housing and output are set at order, so confirm against the datasheet before design freeze.

Target gas 1-6 gases from 500+ options; temperature and humidity optional
Detection principle Electrochemical, catalytic bead, NDIR, PID, thermal conductivity, semiconductor
Sampling mode Diffusion or flow-through
Measuring range Configured per gas: 0-100 %LEL, 0-25/30 %VOL, 0-1 ppm up to 0-5,000 ppm
Accuracy ±1 %FS to ±3 %FS
Response time T90 ≤ 20 s
Output signal RS485 / UART / WiFi / Bluetooth
Power supply 3.3-24 V DC wide input
Housing material Aluminium alloy
Dimensions Per configuration
Weight 47-200 g per module

Need the GMJA400-S-CP configured to your gas list?

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Technical background

The specification above only makes sense alongside the constraints behind it. These notes explain how the numbers on this page are usually set.

Maintenance

Finding a duplicate Modbus address without pulling the loop apart

A duplicated address does not stop the bus. It produces one garbled reply and a working system, which is why it survives commissioning. The symptom is intermittent, so the diagnosis has to be systematic.

Read the guide →
Selection

Choosing the sensing principle before you choose the model

Four principles cover most industrial gas detection. Picking the wrong one gives readings that look plausible and are wrong, so the decision comes before the model number.

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