Carbon Monoxide (CO) Gas Monitors

Which carbon monoxide (CO) gas monitor should you buy in 2026?

Short answer: For workplace carbon monoxide, choose an industrial CO monitor — a single-gas clip like the Honeywell BW Clip CO or Sensorcon Industrial CO, or a 4-gas monitor for confined-space entry. For homes, see our residential CO alarms.

Carbon monoxide (CO) is a colorless, odorless toxic gas from combustion — engines, furnaces, forklifts and welding. This collection covers industrial CO monitors (portable, wearable and 4-gas instruments for the workplace), which are distinct from plug-in home CO alarms. For residential and light-commercial CO alarms, see Carbon Monoxide Alarms & Detectors.

This is a gas-type collection under the Gas Detectors hub. Match the gas to the right form factor: Portable Gas Detectors for carried checks, Personal & Wearable Gas Detectors for single-worker exposure, Fixed Gas Detection Systems for continuous plant monitoring, Area & Transportable Gas Monitors for job-site zones, and Gas Leak Detectors to pinpoint a leak source.

Detectors in this collection

This collection gathers industrial CO instruments — dedicated clips (BW Clip CO, Sensorcon Industrial CO, TopTes CT-580) and the 4-gas monitors that include a CO channel. For home/residential CO alarms instead, see Carbon Monoxide Alarms & Detectors.

Editor’s pick — a single-gas CO clip or a 4-gas monitor
For CO-only workplaces the maintenance-free Honeywell BW Clip CO or rugged Sensorcon suit per-worker wear; for confined-space entry a 4-gas monitor adds O2, LEL and H2S. As an Amazon Associate, WC Safety earns from qualifying purchases.

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How to choose a carbon monoxide detector

Industrial monitor vs home alarm

Industrial CO monitors are worn or carried by workers and read CO continuously; home CO alarms are plug-in fixtures that sound only at high levels. Pick the right tool for the setting.

Single-gas or 4-gas?

A single-gas CO clip suits combustion and engine areas; a 4-gas monitor is standard for confined-space entry.

Watch TWA exposure

CO causes cumulative exposure, so industrial monitors track time-weighted average (TWA) as well as instantaneous levels.

Carbon Monoxide (CO) hazard, exposure limits & placement

The OSHA Permissible Exposure Limit for carbon monoxide is 50 ppm as an 8-hour TWA; ACGIH lists 25 ppm. CO is roughly the density of air and disperses through a space. Industrial monitors track TWA exposure for workers; for homes, see residential CO alarms. Confirm current limits with OSHA's annotated PEL tables.

Frequently asked questions

What is the difference between an industrial CO monitor and a home CO alarm?

Industrial CO monitors are worn or carried by workers and read CO continuously with exposure tracking; home alarms are plug-in fixtures that sound at high levels. For homes, see Carbon Monoxide Alarms & Detectors.

What detects carbon monoxide at work?

An electrochemical CO sensor in a single-gas clip (BW Clip CO, Sensorcon) or a 4-gas monitor.

What is the OSHA limit for CO?

50 ppm as an 8-hour TWA per the OSHA PEL; ACGIH lists 25 ppm.

Where is industrial CO monitoring needed?

Around engines and forklifts, furnaces and boilers, welding, warehouses and parking structures — anywhere combustion produces CO.

Single-gas CO or 4-gas monitor?

A single-gas CO clip suits combustion and engine areas; a 4-gas monitor is standard for confined-space entry where O2, combustibles and H2S also matter.

Does CO cause cumulative exposure?

Yes — CO builds up in the blood, so industrial monitors track time-weighted average (TWA) exposure as well as instantaneous concentration.

Is CO heavier or lighter than air?

Carbon monoxide is close to the density of air and mixes throughout a space, so placement focuses on where people work and where the source is.

Do CO monitors need calibration?

Yes — bump-test and calibrate on schedule with CO calibration gas; electrochemical CO sensors are consumables.

Can I use a home CO alarm at work?

Workplace CO monitoring generally calls for industrial monitors with exposure tracking and bump testing, not residential alarms. See the industrial options here or residential alarms for homes.

How long do CO sensors last?

Typically two to three years; budget for replacement sensors and calibration gas.