9 Best Gas Detectors | June 2017

9 Best Gas Detectors
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We spent 35 hours on research, videography, and editing, to review the top selections for this wiki. Whether you are a service engineer or a homeowner looking to protect his or her family from explosive and dangerous emissions, one of these gas detectors will sound the alarm you need to keep any property safe. Pick the one designed to identify the gases you are most concerned about, like carbon monoxide, methane, butane, or propane. When users buy our independently chosen editorial picks, we may earn commissions to support our work. Skip to the best gas detector on Amazon.
The General Tools & Instruments PNG2000A Pen has a catalytic combustion sensor that is sensitive, reliable, and simple to operate. It arrives pre-calibrated with an LED indicator that turns red when gas levels reach up to 500 PPM.
  • ideal for home and commercial use
  • compact and easy to transport
  • takes a while to start up
Brand General Tools
Model PNG2000A
Weight 5.6 ounces
Rating 3.6 / 5.0
The First Alert CO615 Dual Power features a multifunctional digital display that shows both carbon monoxide and battery power levels at a glance without you having to push any buttons, so you always know if the home is safe.
  • battery backup for power outages
  • power cord is 6 feet long
  • peak level options are limited
Brand First Alert
Model CO615
Weight 12 ounces
Rating 3.8 / 5.0
The Kidde KN-COPP-B-LPM battery-operated carbon monoxide meter measures your level of exposure to dangerous gases over time and acutely. Its freestanding design makes it easy to mount on the wall or to place on a countertop.
  • easy-to-read backlit display
  • 5-year warranty
  • replacing the aas is a pain
Brand Kidde
Model 21008873
Weight 5.6 ounces
Rating 3.6 / 5.0
The colored rim around the Funtin Home AirRadio FTH-KBL1 lets you know at a glance whether the air around your home is safe. It also indicates when the unit is in a self-test mode, when there's an error with its sensor, and when there isn't power running to it.
  • 7 percent lel trigger
  • calibrates automatically
  • lights cannot be deactivated
Brand Funtin Home
Model FTH-KBL1
Weight 3.2 ounces
Rating 4.1 / 5.0
The Kidde KN-COEG-3 Nighthawk plugs into any A/C outlet in your home, and detects both carbon monoxide and dangerous explosive gases. A 9-volt backup battery is also included, so even if the power goes out, you are still safe from harm.
  • very easy to install
  • measures co levels from 30-999 ppm
  • gives too many false alarms
Brand Kidde
Model 21006677
Weight 11.2 ounces
Rating 4.3 / 5.0
The UEi Test Instruments CD100A is ideal for professional service engineers working in a residential capacity. The tip light on its sensor cap easily illuminates the detection area, which can help you locate the source of a leak.
  • 18-inch gooseneck
  • adjustable audio and visual tic rate
  • protective rubber boot
Brand UEi Test Instruments
Model CD100A
Weight 15.2 ounces
Rating 4.1 / 5.0
The Ridgid 36163 CD-100 lets you combine any of its three alert mechanisms depending on your wants and your environment. These include light, sound, and vibration indicators, and you can toggle among them with tremendous ease.
  • adjustable sensitivity
  • 16-inch probe with flex arm
  • rugged ergonomic design
Brand Ridgid
Model CD-100
Weight 1.3 pounds
Rating 4.9 / 5.0
The SGILE Combustible SE131484 combines a ticking alarm with a flashing LED to alert users to the presence of dangerous materials. Its high-sensitivity sensor is adaptable for a wide variety of applications, from homes to mines.
  • 12-inch flexible probe
  • minimal drift and interference
  • runs on three aaa batteries
Model pending
Weight 8.8 ounces
Rating 5.0 / 5.0
The Amprobe GSD600 was designed to detect leaks within closed piping systems. Its flexible stainless steel probe provides access to hard-to-reach places, and keeps the user safely away from the gas should it prove to be particularly volatile.
  • senses both methane and propane
  • audible alert buzzer
  • auto calibrates at startup
Brand Amprobe
Model GSD600
Weight 2.5 pounds
Rating 4.5 / 5.0

Buyer's Guide

Understanding The Underlying Technology

Whether you're a mechanical engineer, construction worker, school official, business owner, or you want to keep your family safe from harmful and toxic emissions in your home, a gas detector can mean the difference between safety and potential disasters.

The gas detector is a portable or fixed device designed to measure and indicate the concentration of toxic emissions in the surrounding environment in order to prevent explosions or harmful exposure. Most detectors produce an audible or visual indicator, such as an alarm or series of lights, to signify high levels of gases in a particular area. While older detectors can only produce alerts for one type of gas, modern detectors are multifunctional and capable of detecting several gases at once.

The devices can be used as standalone units to monitor a small working area or they can be linked together to create an entire protection system, depending on the nature of the circumstances and the size of the detection area. Although it might seem that a gas detector's operation is complicated, the fundamental concept underlying its purpose is relatively simple to comprehend. Because it is designed to measure a specified concentration of a harmful gas, its internal sensor technology serves as the reference point (or scale) for determining normal levels versus dangerous ones. When the detector's sensor surpasses a pre-set level, an alarm is triggered to alert the user of potential danger.

Detectors are categorized by the types of gases they detect and the type of sensor technology they use. Both electrochemical and metal oxide semiconductor sensors will detect toxic gases, while catalytic bead and infrared sensors are designed to detect combustible gases. Electrochemical detectors operate via the diffusion of gases through a porous membrane to an electrode where they undergo redox. The degree of electrical current produced by this chemical reaction is determined by how much of a particular gas has been oxidized at the electrode, which ultimately indicates the level of gas concentration. Electrochemical detectors are used to detect carbon monoxide, chlorine and nitrogen oxides. Metal oxide semiconductor (MOS) sensors also detect carbon monoxide and function using a gas-sensitive film that is composed of either tin or tungsten oxides. This film reacts when a certain level of toxic gas is present, triggering the device to alert or warn the user.

Metal oxide sensors are efficient due to their ability to operate in low-humidity ranges. Catalytic sensors detect combustible gases and are constructed from a platinum-treated wire coil. They function via catalytic oxidation, which is really a fancy way of describing the process by which a chemical helps to speed up the process of a reaction without changing its own structure. When a combustible gas comes into contact with the catalytic surface, it is oxidized, while the wiring resistance is changed at the same time through the release of heat. A bridge circuit, like a Wheatstone bridge, is then used to indicate this change in resistance. Infrared sensors operate through the use of transmitters (light sources) and receivers (light detectors), whereby the presence of a gas interferes with the power of a light transmission between the two. This change in light determines both the presence of a gas and its type.

Determining The Best Detection

The type of business, the size of the environment, and the gases that are present are all driving forces behind one's decision to invest in a gas detection system. For example, if you work in a large industrial complex, a welding shop, or any environment with combustible gases around all the time, then fixed catalytic or infrared detectors will certainly come in handy. The same can be said for a fixed detector if you're a homeowner with the need for an easy-to-read display to alert you and your family to the presence of toxic gases. The ability to detect multiple gases is also important, particularly methane and propane.

Portable detectors are beneficial for use in tight spaces and when having to work underground (e.g. in subway systems between station platforms), as they can be battery-operated and easily attached to a worker's tool belt. If you're taking tools with you on the job, having one with a compact design makes it easy to transport and to store.

Testing and calibrating one's chosen gas detector is an important consideration for maintaining safety and confidence that the device (whether it's fixed or portable) is working properly, accurately, and that it will alert you when the need arises.

A Brief History Of Gas Detectors

Prior to the development of electrical sensor technology, the earliest detection methods used around the time of the Industrial Revolution included wet blankets and long wicks lit on fire to detect dangerous pockets of methane gas located in underground coal mines. The dangers of methane come from the fact that it cannot be seen or smelled and that it can appear naturally from underground.

Considering that coal is a fossil fuel still in use to this day, one can understand the dangers first employed to harness its energy using primitive mining techniques. After this detection method proved ineffective, miners then used canaries in coal mines to assist in their detection efforts due to the bird's loud chirp and similarities to the part of the human nervous system that controls breathing. Miners believed that when a canary wasn't doing well, it would begin to shake its cage, alerting them that it wasn't safe to remain inside.

Following use of the canary, the flame light was the next form of gas detection. The flame light was encapsulated inside a shell with an outer glass piece featuring three horizontal line incisions running along its surface. A flame was always started on the middle line in a fresh air environment. If the flame lowered itself toward the bottom line, a miner would know they were in an oxygen-deficient environment. If the flame rose toward the top line, it would signify an oxygen-enriched environment with the possibility for the presence of methane.

The first gas monitor was a valved device showing the level of methane present in the atmosphere and was detected through a sensor called the catalytic diffusion sensor. This sensor would burn the gas inside it, but never allowed the burning process to occur outside of the sensor.

The first electronic household carbon monoxide detectors were developed in the 1980s. Since that time, many electronic devices (fixed and portable) have been developed for a variety of applications to detect, monitor, and alert people to potential gas leaks. This includes the presence of gas detectors inside modern consumer automobiles.

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Last updated on June 21, 2017 by Daniel Imperiale

Daniel is a writer, actor, and director living in Los Angeles, CA. He spent a large portion of his 20s roaming the country in search of new experiences, taking on odd jobs in the strangest places, studying at incredible schools, and making art with empathy and curiosity.

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