Anaesthetic Gas Interferometer

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

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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.

Riken Interferometer History

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.

The FI-8000 is also used in many other applications; such as Fumigation, Solvents, Inert Gases, Toxic Gases, and Gas Purity.

Today, Riken’s interferometer is considered the instrument of choice for anaesthetic vaporiser checking, in part due to its portability, robustness, low cost, and reliable measurements. It is used throughout the NHS, veterinary clinics MOD, and by vaporiser manufactures / service companies.

  • 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)
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.

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

The FI-8000 is also used for many other applications; such as Fumigation, Solvents, and Gas Purity.

Measuring principle Optical Interferometric Method
Measuring gas Desflurane, Isoflurane, Sevoflurane, and Halothane, Enflurane.
(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