COH-A2 Dual Carbon Monoxide / Hydrogen Sulphide Sensor

CO & H2S 2-Gas Sensor, Electrochemical, A-Series, CO: 0–1000 ppm, H2S: 0–100 ppm

Reliable multi-gas detection for safety-critical monitoring and process control.

Alphasense CO / H2S sensors provide reliable 2-gas monitoring in 1 sensor solution. These 2-gas sensors detect both carbon monoxide and hydrogen sulphide for industrial safety, portable and fixed gas detection, and process or biogas applications where fast response and stability are critical.

These compact dual CO / H2S sensors are recommended for 4‑gas portable monitors where board space and power are limited.
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Key Specifications:

 

Sensor Model

Target Gas

Package Size

Concentration Range

Sensitivity

T90 Response Time

Warranty

COH-A2

Carbon Monoxide (CO) + Hydrogen Sulphide (H2S)

A-Series

CO: 0–1000 ppm, H2S: 0–100 ppm (typical portable safety ranges)

CO: 27 to 55 nA/ppm; H2S: 90 to175 nA/pp

<25s for CO;
<30s for H2S (typical)

24 months

 

Feature

Benefit

Dual CO + H2S measurement in a single package

Reduces instrument footprint and simplifies 4‑gas monitor design

Electrochemical A‑Series format

Compatible with standard portable safety platforms and existing sockets.

Filtered CO channel

Minimises H2S cross‑sensitivity into the CO channel for more accurate readings

Field‑proven dual‑gas architecture

Supports high reliability in multi‑gas personal monitors.

Fast response for rapid alarm triggering

Supports timely alarms in safety-critical environments

Proven stability across temperature and humidity ranges

Delivers consistent performance in real-world conditions.

Long operational lifetime

Helps reduce maintenance and replacement frequency for OEMs and end users