Products > Safety > Gas Detector


FPI offers a rich gas detector portfolio that developed on electrochemical, catalytic combustion, photo ionization and infrared technologies. The GT series gas detectors are used to for monitor flammable and toxic gases, oxygen, carbon dioxide, VOCs and other inorganic gases. The gas detectors can make a valuable contribution to the safety of various industries. They can be used to trigger alarms if a specified concentration of the gas or vapor is exceeded. This can provide an early warning of a problem and help to ensure people’s safety.


The detector can be mounted on a vertical/horizontal tube or wall.

菱形图标.pngLeak source and leak accumulation should be identified and used in selecting the optimum detector mounting location within the area.

菱形图标.pngIdentify air current, wind patterns within the protected areas when choosing installation point.

菱形图标.pngInstallation height is determined by density of measured gas.

Note: Locations near excessive heat or vibration sources should be avoided if possible.

gt install.png

Features and Benefits

菱形图标.pngIntegrated design and adaptable for harsh conditions

菱形图标.pngFast and reliable detection for several gases down to ppm, %LEL level

菱形图标.pngEasy handling and programmable with remote controller or built-in keys

菱形图标.pngStandard 4-20mA, RS 485, HART output

菱形图标.pngVisual and audible alarms

菱形图标.pngOne-key calibration

Application Areas


  • Large-scale cultivating workshop

  • CO2 detection in greenhouse

  • Biogas digester


  • Coal gas detection

  • Coke making, iron making and steel making

  • Hot rolling, cold rolling and acid cleaning

  • Confined space

Petroleum and petrochemical

  • Oilfield operation district

  • Well drilling platform

  • Natural gas purification plant

  • Oil&gas transportation & distribution

  • Refinery production process

  • Refined oil storage


  • Leak point in pipeline

  • Regulator station, pressure regulating box, gate well

  • Boiler gas

  • Hotel kitchen

  • Sewage treatment

Type of Sensor

There are a number of different types of sensors used for gas detection. The choice of sensor depends on:

菱形图标.pngthe gas to be detected

菱形图标.pngthe expected range of concentration

菱形图标.pngwhether the detector is fixed or portable

菱形图标.pngwhether the detector is point or open path

Sensor Principle
CatalyticThe operating principle is that heat is generated during the catalyzed   reaction between the gas and oxygen in air. The resulting rise in temperature   of the catalyst bead causes a change in electrical resistance of a platinum   wire embedded in the bead, also acting as the heater, which is a measure of   gas concentration.
Combustible gas detection, 0~100%LEL
Product model: GT-1030/1031-TF, and GT-1030/1031-TS,   etc.
ElectrochemicalThe operating principle is that the gas diffuses through a permeable   electrode to its interface with the cell’s electrolyte. Here electrochemical   reactions take place which alter the electrical characteristics of this   electrode. Measurement of these electrical parameters with respect to other   electrodes within the cell give a signal proportional to the gas   concentration.
Oxygen and toxic gas detection, in ppm level
Product model: GT-1121, GT-1020-DF, and GT-1020-TF,   etc.
Photo   IonizationThe operating principle is that an ionized gas will conduct an   electrical current in proportion to the number of ions present. Hydrocarbon   gases and vapors are easily ionized and the current flow produced is easily   measured.
VOCs and some inorganic gas detection, in ppm level
Product model: GT-1040.
InfraredThe operating principle is based on the absorption of infrared light by   certain molecules which are detected by a decrease in transmitted radiation   over a beam path.
Detect CO2 and methane, and halohydrocarbon gas such as   chloromethane
Product model: GT-1020-IR, and GT-1030/1031-IR.

Measured Gases

gt gas.png