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Detection Modules

GMJA400-S-4IN1 Four-in-One Gas Sensor Module

GMJA400-S-4IN1

Four sensor channels on one board, roughly 45 × 45 mm. One connector instead of four modules and four wiring runs.

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Overview

The 4IN1 is the MIN's bigger sibling: same board concept, but four sensor channels populated on a single PCB instead of one. Four gases are monitored at once, on a board of roughly 45 × 45 mm.

For an integrator that replaces four separate modules, four sets of wiring and four mounting points with one board and one connector. The four channels are chosen at order from more than 500 gases, so a confined-space instrument can carry combustible, oxygen, carbon monoxide and hydrogen sulphide without stacking hardware.

It is a diffusion module running from 3.3 V DC, with UART, RS485, WiFi or Bluetooth output, and it ships calibrated. A housing can be specified if the board will not sit inside an existing enclosure.

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 4 gases on one board from 500+ options: combustibles, oxygen, toxics, VOCs
Detection principle Electrochemical, catalytic bead, NDIR, PID, thermal conductivity, semiconductor
Sampling mode Diffusion
Measuring range 0-100 %LEL, 0-25/30 %VOL, 0-1 ppm up to 0-5,000 ppm, configured at order
Accuracy ±1 %FS to ±3 %FS
Response time T90 10-120 s, depending on sensor
Output signal UART / RS485 / WiFi / Bluetooth
Power supply DC 3.3 V
Housing material PCB module, housing optional
Dimensions ≈45 × 45 mm, customisable to the host enclosure
Weight Per configuration

Need the GMJA400-S-4IN1 configured to your gas list?

Send the gases, the ranges and the host enclosure. We come back with a model recommendation, the datasheet and a price.

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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.

Selection

Twelve questions to ask a gas detection OEM before you send a PO

Most of these take one email to answer. The four that matter most are the ones about certification ownership, firmware control, tooling and support, and they are the four buyers ask least often.

Read the guide →
Installation

Why confined space testing follows O2, LEL, H2S, CO in that order

The order on a four-gas instrument is not alphabetical or traditional. It runs from the hazard that kills fastest to the one that kills slowest, and one channel cannot be trusted until another has been read.

Read the guide →

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