RX-8500 Series

Riken Keiki Portable Multi Gas Detectors for Tankers

  • Riken Keiki RX-8500 Series Portable Multi Gas Monitors for Oil and LNG Riken Keiki RX-8500 Series Portable Multi Gas Monitors for Oil and LNG
RX-8500 Series at a glance

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Riken Keiki RX-8500 Series Portable Multi Gas Monitors for Oil and LNG

The Riken Keiki RX-8500 Series Portable Multi Gas Monitors are designed for measuring multiple gases in inert or air atmospheres. Their main application is aboard Liquid Natural Gas (LNG) and Crude Oil marine tankers. They also find uses in Oil storage depots, Tank farms, Petrochemical plants and Oil refineries. They replace and improve upon the very successful RX-515/516/517 family.

RX-8500 series users typically use them to measure gas concentrations in tanks or piping during inerting/purging and tank maintenance work. Their advanced sensor technology gives accurate gas measurement even in Nitrogen (N2) and other inert environments.

There are two versions of the instrument in the series.

The RX-8500 is designed specifically for Liquid Natural Gas (LNG) carriers. It has IR sensors for Methane (CH4) 0 – 100% LEL and 0 – 100% Volume( Autoranging). Carbon Dioxide (CO2) 0-20% Volume as well as an Electro-Chemical sensor for Carbon Monoxide (CO) 0-1000ppm.  A Galvanic Sensor for Oxygen with a 0-40% Volume range is also included.

The RX-8700 is designed specifically for Crude Oil Tankers. It uses an IR sensor to measure hydrocarbon vapours over two ranges; 0 – 100% LEL and 0 – 100% volume. The Oxygen measurement range is 0-40% Volume using a Galvanic Sensor. The RX-8700 will also measure Hydrogen Sulphide (H2S), using an Electro-Chemical cell, over a 0-1000ppm range.

Auto-ranging Technology :

The RX-8500 Series has accurate measurement over the entire range of target hydrocarbons up to 100% by volume. Users benefit from dual auto-ranging technology that allows the instruments to automatically switch from a 0 – 100% LEL to a 0 – 100% volume range.

The RX-8500 Series has an internal pump that samples at 750ml per minute.  The RX8500 / RX8700 has a clear and intuitive digital display. The Instruments are explosion and intrinsically safe and are ATEX as well as MED approved.

The RX-8500 Series has a compact and lightweight but very robust design. They are powered by a Lithium Ion battery pack. This gives over 15 hours of continuous operation as well as being quick to charge.

The RX-8500 series has additional features that include Pilot and pump driving indicator, activating confirmation beep (1 minute intervals) and Bump Test function. Users have IrDA communications and Password Protection also available. Data logger software is available as an option.

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  • Dual range detection of CH4 or HC in % vol and %LEL
  • Unique gas combinations : CH4/O2/CO/CO2 and HC/O2/H2S
  • Accurately measure CH4 or HC from inerted tanks with infrared sensor.
  • High Range H2S (0-1000ppm) available.
  • Robust and intrinsically safe design
  • Long lasting and fast charging Lithium Ion battery.
  • Pilot and pump driving indicator
  • Activating confirmation signal.
  • Bump test function.
  • IrDA communications.
  • Password protection.
  • Liquid Natural Gas (LNG) storage vessel gas monitoring
  • Crude Oil Tanker storage tank gas monitoring
  • Oil and LNG storage depots
  • Tank Farms
  • Refineries
  • Petrochemical plants


Target Gas  

Combustible Gas (HC)

Oxygen (O2) Hydrogen Sulphide ( H2S)
Detection Principal Non-Dispersive Infrared Ray Galvanic Cell Electro-chemical
Detection range 0-100.0%LEL/



(25.1-40.0vol% )





Increments 0.5%LEL(0-100.0%LEL)


0.1%vol 0.5ppm 1ppm
Sampling Method Sample Draw
Sampling Rate Minimum 0.75L/min
Display Digital LCD ( 7 segment + sign + bar display )
Power Supply Lithium-Ion Battery ( Standard )

Alkaline battery ( AA Alkaline battery x 3 ) ( option)

Continuous operation Li-ion battery : Longer than 15 hours ( full charge, no alarm, no light at 25 Deg C

AA Battery Unit : Longer than 8 hours ( new battery , no alarm, no light at 25 Deg C

Operating temp and Humidity -20-+50 deg C , below 85% RH ( Non-condensing )
Dimensions Approx 154(W) x 81(H) x 163(D) mm
Weight Approx 1.3kg ( Lithium battery type , 1.2kg Alkaline battery type
Ingress proof rating Equivalent to IP67
Explosion Proof Intrinsically safe (Ex ia II CT4) ( ATEX/IECEx)
Approvals ATEX/IECDx . TIIS . MED ( Pending )
Other Functions LCD backlight , Datalogger , Log data , Peak Hold , Pump stop function
Transmission method IrDA for Datalogger


Target Gas Methane (CH4) Oxygen (O2) Carbon Monoxide (CO) Carbon Dioxide (CO2)
Detection Principal Non- Dispersive Infrared Ray Galvanic Cell Electro-Chemical Non-Dispersive Infrared Ray
Detection range 0-100.0%LEL/


0-40%.0vol% 0-1000ppm 0-20.0%vol
Increments 0.5%LEL(0-100.0%LEL)


0.1%vol 1ppm 0.01%vol(0-2%vol)


0.1%vol  (5-20%vol)