FI-8000

Optical Gas Indicator

  • Optical Gas Indicator Optical Gas Indicator
FI-8000 at a glance

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This highly accurate Optical Gas Indicator is customizable for up to 8 gases and ranges, and uses optical interferometry to acuratley measure a gas concentration in a known base gas, such as air. Numorous gases are available to choose from, and if not listed on our current gas list, please ask, it is probably possible to include.

Because the principle operation is the comparison of the optical refractive index of a gas, there are no moving parts or problems with sensor drift. This gives a stable calibration, allowing for long periods between calibration, thus saving on maintenance cost.

Riken Interferometer History

The FI-8000 is the latest model from Riken in a long line of optical interferometers dating back to the 1930’s when Riken’s founder first developed the technology for Methane detection to help prevent explosion accidents on oil tankers and in coal mines.

In the 1970’s Weatherall developed with Riken the instrument for anaesthetic gases. In conjunction with Dr John F Nunn’s research, published in the British Journal of Anaesthesia, helped validate the principle of interference refractometry as a technique suitable for measuring anaesthetic gases such as Halothane, Isoflurane, Sevoflurane, Desflurane and Enflurane.

  • Up to 8 gas measuring ranges
  • Easy-to-read wide LCD display
  • Operates continuously for over 12 hours (on 3 AA batteries)
  • Optional Lithium ion battery unit give over 18 hours continuous use.
  • Robust, rugged body design
  • Impact resistant rubber
  • Ingress Protection IP67
    (Suited for outdoors)
  • Lightweight at only approx. 1.2 kg
    (approx. 154 mm(W) x 127mm(H) x 81mm(D))
  • Two sample methods available:
    Sample Pump or Hand Aspirated
  • Data logging
  • Intermittent measuring mode available
    (for sample pump type only)
  • Intrinsic safety explosion class Exia II CT4
    (Presafe 14 ATEX 5711)
Chamber length: 5mm
Detection gas Base gas Range
Methyl bromide Air 0~100vol%
Sulfur Hexafluoride Air 0~100vol%
Sulfur Hexafluoride Air 0~99.9%up
Sulfur Hexafluoride N2 0~100vol%
Propane Air 0~100vol%
Iso-butane Air 0~100vol%
N-butane Air 0~100vol%
Flon 22 Air 0~100vol%
Dimethyl Ether Air 0~100vol%
Dimethyl Ether N2 0~100vol%
Xenon Air 0~100vol%
Ethylene Air 0~100vol%
Chorine Air 0~100vol%
Vinyl chloride N2 0~100vol%
Chamber length: 5mm
Detection gas Base gas Range
Propane Air 0~101.3 MJ/m3
Gross 0°C
Butane Air 0~134.2 MJ/m3
Gross 0°C
Propane Air 0~93.15 MJ/m3
Net 0°C
Butane Air 0~123.7 MJ/m3
Net 0°C
Chamber length: 24mm
Detection gas Base gas Range
Halothane O2 0~6vol%
Isoflurane O2 0~8vol%
Sevoflurane O2 0~10vol%
Desflurane O2 0~20vol%
Halothane Air 0~6vol%
Isoflurane Air 0~8vol%
Sevoflurane Air 0~10vol%
Desflurane Air 0~20vol%
Enflurane * O2 0~10vol%
Enflurane * Air 0~10vol%
*Available on request. Select up to a maximum of 8 gas ranges per instrument.
Chamber length: 24mm
Detection gas Base gas Range
Helium Air 0~100vol%
Helium N2 0~100vol%
Helium Argon 0~100vol%
Hydrogen Air 0~100vol%
Hydrogen N2 0~100vol%
Heavy Hydrogen Air 0~100vol%
Heavy Hydrogen N2 0~100vol%
Carbon dioxide Air 0~100vol%
Carbon dioxide N2 0~100vol%
Carbon dioxide Argon 0~100vol%
Neon Air 0~100vol%
Methane Air 0~100vol%
Methane Air 0~100vol%
Nitrous Oxide Air 0~100vol%
Ozone O2 0~100vol%
Chamber length: 24mm
Detection gas Base gas Range
LNG or
LNG +LPG
25~50 MJ/m3
Gross 0°C
LNG or
LNG +LPG
22~45 MJ/m3
Net 0°C
Chamber length: 48mm
Detection gas Base gas Range
Toluene Air 0~100%LEL
Ethyl acetate Air 0~100%LEL
Xylene Air 0~100%LEL
Iso-proply alcohol Air 0~100%LEL
M.E.K Air 0~100%LEL
Methanol Air 0~100%LEL
Propane Air 0~100%LEL
Iso-butane Air 0~100%LEL
Acetone Air 0~100%LEL
Ethyl alcohol Air 0~100%LEL
Methane Air 0~100%LEL
Hydrogen Air 0~100%LEL
Ethyl chloride Air 0~100%LEL
Ethylene Air 0~100%LEL
Styrene Air 0~100%LEL
Ammonia Air 0~100%LEL
Tetrahydroflane Air 0~100%LEL
Dioxolane Air 0~100%LEL
Methyl-isopropil-Keton Air 0~100%LEL
Tetrafluoro-propane Air 0~100%LEL
Butylacetate Air 0~100%LEL
Chamber length: 48mm
Detection gas Base gas Range
Methyl Bromide Air 0~200g/m3
Methy Iodine Air 0~200g/m3
Sulfuryl Fluoride Air 0~200g/m3
Methyl Bromide Air 0~5vol%
Propylene oxide Air 0~10vol%
Chamber length: 48mm
Detection gas Base gas Range
Ammonia N2 0~100vol%
Oxygen N2 0~100vol%

Select up to a maximum of 8 gas ranges per instrument from one chamber length (5mm or 24mm or 48mm). Chamber length is determined by gas characteristics.

Other gases may be possible. Please contact us if you would like to measure a non-listed gas.

Model FI-8000
Measuring principle Optical Interferometric Method
Measuring gas (other gases may be possible. Please contact us if you would like to measure a non-listed gas)
Indication accuracy Within ±3% (at constant temperature)*
Type TYPE P-_ _-_ _ TYPE A-_ _-_ _
Sampling method Pump suction type Hand-aspirating type
Self-diagnosis function Low battery, Low light , Low contrast, abnormal atmospheric pressure and abnormal temperature
Display LCD digital (7-segment value display + code + 20 segment word x 2 lines)
Screen Measuring gas, gas concentration , measuring unit and battery capacity reminder
Power source Alkaline battery pack(AA size battery x 3 pcs) (standard)
Or, Lithium ion battery (optional)
Ingress proof rating IP67 equivalent
Ambient humidity & temp Temperature : -20~50°C, Humidity : Below 95%RH (non-condensing)
Dimensions Approx. 154(W)×127(H)×81(D)mm
Weight Approx. 1.1kg (including alkaline batteries)
Approx. 1.2kg (including lithium ion batteries)
Explosion proof Intrinsically safe(Exia II CT4) (ATEX)
Continuous operation Over 12 hrs (for alkaline battery use)
Over 18 hrs (for lithium ion battery use)
(25°C with no backlight on)
Over 16 hrs (for alkaline battery use)
Over 24 hrs (for lithium ion battery use)
(25°C with no backlight on)
External output IrDA (for data logging)
Function Data logging , atmospheric pressure correction, temp. compensation

*Indication accuracy subject to the measuring gas