Sensor principles

Gas detectors incorporate various sensors based on the target gas type and concentrations, and discussed here are the main sensor principles adopted by Riken Keiki gas detectors.

New Ceramic Catalytic Method

This sensor relies on detecting the heat produced when a combustible gas burns on an ultrafine particle oxidation catalyst (new ceramic). The sensor measures over a broad range, from several thousand ppm to the LEL.
(Main detection target gas: Combustible gases) More Information

Interferometer Method

This optical sensor offers accuracy and outstanding long-term consistency. The sensor also has an extensive history as a key product in Riken Keiki’s history.
(Main detection target gas: Combustible gases) More Information

Catalytic Combustion Method

This sensor relies on detecting the heat produced when a combustible gas burns on an oxidation catalyst. Ideal for detecting the lower explosive limit (LEL)
(Main detection target gas: Combustible gases) More Information

Semi-Conductor Method

This general-purpose sensor is designed to detect a wide range of gases, from toxic gases to combustible gases. The sensor offers high sensitivity, with high output in the low concentration range.
(Main detection target gas: Combustible gases, toxic gases) More Information

Hot Wire Type Semi-Conductor Method

This high-sensitivity combustible gas sensor is ideal for detecting low-concentration gas. Low power consumption and compact dimensions also make it ideal for portable gas detectors.
(Main detection target gas: Combustible gases, toxic gases) More Information

Thermal Conductivity Method

This sensor detects concentrations of target gases based on differences in thermal conductivity of these gases. Ideal to detecting high-concentration gas (vol%)
(Main detection target gas: Combustible gases) More Information

Potentiostatic Electrolysis Method

This sensor is capable of selectively detecting a target gas. Ideal for detecting toxic gases
(Main detection target gas: Toxic gases) More Information

Membrane Type Galvanic Cell Method

This sensor applies the galvanic cell principle to detect oxygen. It does not require an external power supply and offers outstanding consistency in performance over the long term.
(Main detection target gas: Oxygen) More Information

Non-Dispersive Infrared Method

This sensor relies on the unique infrared absorbing characteristics of the detection target gas. The optical sensor offers outstanding consistency in performance over the long term.
(Main detection target gas: Combustible gases, toxic gases) More Information

Membrane-Separated Electrode Method

Relying on electrochemical principles, this toxic gas sensor incorporates a configuration in which the gas permeable membrane (diaphragm) is completely separated from the working electrode to achieve excellent selectivity.
(Main detection target gas: Toxic gases) More Information

Chemical Tape Method

This sensor detects extremely low concentrations of gas based on the color of the tape when the detection target gas reacts with color developer impregnated into the tape.
(Main detection target gas: Toxic gases) More Information

Photo-Ionization Detector

This sensor detects gas concentrations based on the ionization current generated when the detection target gas is irradiated and ionized by ultraviolet light.
(Main detection target gas: Toxic gases) More Information

Pyrolysis-Particle Detection Method

This sensor detects gas by measuring concentrations of the oxide particles produced when the detection target gas is heated. It offers outstanding consistency in performance over the long term, interference characteristics, and response characteristics.
(Main detection target gas: Toxic gases) More Information

Flame Detector

This device detects the presence of flames by detecting the intense ultraviolet and infrared light emitted from the gas when a substance ignites.
(Detection target: Flame detection) More Information

Differential Optical Absorption Spectroscopy

This method for measuring gas concentrations relies on the fact that light of certain wavelengths is absorbed by different gases. Open-path gas detectors rely on this method.
(Main detection target gas: Combustible gases) More Information

X-ray diffractometer equipped with an X-ray fluorescence spectrometer

This system incorporates an angular drive mechanism in an energy dispersion X-ray fluorescence analyzer detector to enable single unit analysis of both X-ray diffraction and fluorescence.
(Detection target: X-ray diffraction and fluorescence measurement) More Information

Open Countor for Low Energy Electron Counting

This is the world’s only surface analysis sensor capable of counting low-energy electrons emitted within air. This proprietary RIKEN product was developed and commercially introduced by Riken Keiki.
(Detection target: Substance surface analysis) More Information