Home > Chemical > Technology > Sensors > Catalytic Bead Sensor (CAT)


Catalytic bead sensors are solid-state detectors usually employed to detect combustible gases.  CATS are capable of detecting the presence of gas by measuring the change in resistance of a conductive material as a combustible gas oxidizes on a catalyst surface. In the most common design, two platinum coils are embedded in a bed of alumina and the voltage difference across them is measured using a Wheatstone bridge circuit configuration. One wire contains a catalyst that makes it an oxidative environment while the other wire, a reference, inhibits oxidation. When an oxidizable gas is present in the sensor, oxidation occurs at one wire and not at the other. This induces a voltage difference across the wire and an alarm is triggered to indicate the presence of a gas.  Sensors are typically calibrated to methane gas and correction factors are applied for the detection of other gases of interest.  In order to obtain the highest degree accuracy and precision, gas-specific calibration is required.  As gas sensors, CATs can be employed in a variety of areas including mining, emergency response, and any other application where the presence of combustible gases is of concern.    As gas sensors, most CAT devices are hand held or portable units.  The technology has been in place for more than half a century and many manufacturers are producing CATs.  Units cost is typically under $25,000. 

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Catalytic Bead Sensors

Catalytic Bead Sensors

Sierra Monitor Corporation

These sensors utilize catalytic bead technology to monitor for combustible gases (methane and others...

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Delphian Catalytic Bead Sensor

Delphian Catalytic Bead Sensor

Delphian Corporation

A wire is coated with either glass or ceramic. It is then coated again with a catalyst. The coil i...

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Dräger Catalytic EX Sensors

Dräger Catalytic EX Sensors

Dräger Safety, Inc.

Designed for use with the Dräger X-AM 7000. A platinum coil is embedded in a ceramic bead. A curren...

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Teledyne FLIR Detection, Inc.

The FLIR MUVE™ C360 is a multi-gas detector completely integrated with an unmanned aerial system (UA...

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Gas sniper portable gas detector

Gas sniper portable gas detector

Matheson Tri Gas

The Gas Sniper can monitor up to six gases simultaneously. Depending on the specific gas being monit...

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GDI Observer

GDI Observer

Schauenburg Flexadux Corporation (Headquarters)

The GDI Observer is a handheld gas monitor for up to five gases. It includes RF transmission to allo...

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Genesis Portable Gas Monitor

Genesis Portable Gas Monitor

Thermo Fisher Scientific, Inc.

Thermo Electron’s Genesis is a personal, portable gas monitor that is configurable for one to four p...

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Industrial Catalytic Gas Sensors

Industrial Catalytic Gas Sensors

Nemoto B.V.

The industrial catalytic gas sensors are catalytic (pellistor) type flammable gas sensors designed f...

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IQ-1000 Portable Gas Monitor

IQ-1000 Portable Gas Monitor

International Sensor Technology

The IQ-1000 accepts electrochemical, catalytic bead, and solid-state sensors. The IQ-1000 accepts an...

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Model FP-700 Combustible Gas Sensor

Model FP-700 Combustible Gas Sensor

Detcon, Inc.

Model FP-700 is a portable, non-intrusive “Smart” sensor designed to detect and monitor combustible ...

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Mine Safety Appliances Company (MSA)

The Orion Multigas Detector is an easy-to-use portable instrument for detecting the presence of O2, ...

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Pellistor Catalytic Sensors

Pellistor Catalytic Sensors

SGX Sensortech (IS) Ltd

The sensor is designed for use with a Wheatstone Bridge circuit so that a difference signal may be o...

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Pellistor Gas Sensors (Micropel, Miniature Citipel, Citipel)

Pellistor Gas Sensors (Micropel, Miniature Citipel, Citipel)

City Technologies

Pellistors employ catalytic combustion to measure combustible gases or vapors in air up to the Lower...

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S2 Series

S2 Series

RKI Instruments

The RKI S2 series gas sensor/transmitters are highly reliable and very cost effective for the detect...

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Enmet Corporation

The SAPPHIRE is a handheld gas detector using up to 6 sensors simultaneously. SMART, pre-calibrated,...

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Scout Multi-gas Personal Monitor

Scout Multi-gas Personal Monitor

3M™ Scott™ Fire & Safety

The Scott Scout Multigas Portable Monitor is designed to monitor up to five atmospheric hazards simu...

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