Gas detectors monitor the air for the presence of hazardous, combustible, or toxic gases, alerting workers before exposure reaches dangerous levels. We stock single-gas and multi-gas detectors for confined space entry, industrial hygiene, and personal safety applications.

Single-Gas vs. Multi-Gas Detectors

Single-gas detectors monitor one specific gas, such as carbon monoxide, hydrogen sulfide, or oxygen, and are commonly used as a low-cost personal safety device for a known hazard. Multi-gas detectors monitor several gases simultaneously, typically combustible gas (LEL), oxygen, carbon monoxide, and hydrogen sulfide, making them the standard choice for confined space entry work.

Detection Technology

Electrochemical sensors are widely used for toxic gases like CO and H2S due to their accuracy and long service life. Catalytic bead and infrared sensors are used to detect combustible gases, with infrared sensors offering better resistance to sensor poisoning in harsh environments. PID (photoionization detector) sensors are used for detecting volatile organic compounds (VOCs) at low concentrations.

Calibration & Bump Testing

Gas detectors require regular bump testing (a quick functional check with calibration gas) before each use, along with full calibration on a scheduled interval, typically every 6 months depending on usage and manufacturer recommendation. Automated bump test and calibration stations are available for facilities managing multiple units.

Common Applications

Confined space entry and permit work
Industrial hygiene and workplace safety monitoring
Oil, gas, and petrochemical facilities
Wastewater and utility work
Fire and hazmat response

Not sure which gas detector fits your application? Contact our team — we can help match sensor type, gas coverage, and features to your specific requirement.

Frequently Asked Questions

Do I need a single-gas or multi-gas detector?

If you’re monitoring for one known hazard, a single-gas detector is a cost-effective option. For confined space entry or environments with multiple potential hazards, a multi-gas detector covering combustible gas, oxygen, and toxic gases is generally required.

How often should a gas detector be bump tested and calibrated?

Bump testing is recommended before each day’s use to confirm the sensors and alarms respond correctly. Full calibration is typically required every 6 months, though high-use or harsh environments may require more frequent calibration.

What’s the difference between electrochemical and catalytic bead sensors?

Electrochemical sensors are used for toxic gas detection and offer high accuracy over a long service life. Catalytic bead sensors are used to detect combustible gases and measure the lower explosive limit (LEL) of the atmosphere.

Do you provide calibration gas and accessories?

Yes, calibration gas, regulators, and calibration/bump test stations are available. Contact us to confirm compatibility with your specific detector model.