Single-Gas Monitors

Identify Specific Gas Threats With Alerts You Can Trust

Shop a large selection of single gas detectors and monitors, including H2S monitors from top brands like BW Honeywell, WatchGas, mPower, and RKI Instruments.

PK Safety offers single gas monitors for all needs, including: hydrogen sulfide (H2S), ammonia, oxygen (O2), sulfur dioxide (SO2), chlorine, carbon monoxide (CO), nitrogen dioxide, ethylene oxide, and more. We also offer 4-gas and multi-gas monitors.

FAQs

What is a single-gas monitor?

A single-gas monitor is a portable device designed to detect the presence of a single target gas. They are used in a wide variety of work environments where specific toxic gases are likely present, providing reliable protection and compliance with workplace safety standards.

The monitor comes with a sensor that will report dangerous levels, and some also display the percentage of hazardous gases such as carbon monoxide and hydrogen sulfide in the atmosphere. It sends an electric signal to issue the reading when the sensor mixes with the target gas to produce a chemical reaction. All feature an audible alarm to alert workers immediately when dangerous concentrations are detected.

Most single-gas monitors are made to be worn on the worker’s collar, helmet, or bag strap so they can continuously monitor the air as they move through the space. The device should be worn in the breathing zone, a ten-inch radius around the person’s nose and mouth, to keep readings as accurate as possible.

Some models of portable gas monitors come with rechargeable batteries that last the duration of the worker’s shift. Charge them at the end of each workday to prepare your equipment for the next user. Some monitors can run continuously for their entire life span, offering a low-cost solution for compliance needs. No need for calibration, sensor replacement, battery replacement, or battery charging.

How often do single gas detectors and monitors need to be calibrated?

Each manufacturer has different rules for their specific instruments. We recommend calibrating single gas detectors and monitors at least every six months, or if your device fails a bump test. Recalibration resets the sensor to the default reading to improve the accuracy of the results.

Use a cylinder of test gas to perform a bump test before the start of every shift to see if the sensor is accurate. The concentration of gas in the cylinder should match the reading listed on the monitor. Ensure the test gas has not expired, as the relative mix of gas may change over time. 

If the reading does not match what’s listed on the cylinder, you will need to recalibrate the gas monitor. Follow the directions in the owner’s manual to improve the reliability and efficiency of your single gas detector or monitor.

What is LEL in a gas detector?

The LEL on a single gas detector refers to the Lower Explosive Limit of the target gas. This is the lowest point of concentration at which the gas becomes flammable, increasing the chances of a flash fire. The LEL is expressed as a percentage per volume.

Once the target gas reaches 100% LEL, the atmosphere is considered flammable. Be sure to check the LEL for the target gas and keep an eye on the LEL reading. Modern single gas detectors and monitors provide real-time alerts to ensure immediate response to changing conditions.

Use this gas detection equipment to improve worker safety when occupying areas with hazardous gases such as carbon monoxide and hydrogen sulfide. Contact PK Safety to learn more about the gas monitors for gases such as hydrogen sulfide, carbon monoxide, and hydrogen cyanide listed on our website. 

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