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Portable Gas Detectors

RX-8700 Sample Drawing Portable Multi Gas Monitors for Cargo Monitoring on Crude Oil Tankers

IR Sensor for HC ( Isobutane i-C4H10), Galvanic sensor for Oxygen (O2) and 2 x Electro-chemical Sensors for H2S low range 0-100ppm and high range 0-1000ppm

The Riken Keiki RX-8700 Portable Multi Gas Monitors are designed for measuring multiple gases in inert or air atmospheres. Their main application is aboard  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-516/517 family.

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.

Product Features


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(Autoranging). 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-8700 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-8700 Series has an internal pump that samples at 750ml per minute. The 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-8700 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-8700 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.


Target Gas 

Combustible Gas (HC) Oxygen (O2)  Hydrogen Sulphide (H2S) 
Detection Principal  Non-Dispersive Infrared  Galvanic Cell  Electro-Chemical 
Detection Range  0-100% LEL / 0-100% Vol 



 Lo 0-30ppm  Hi 0-1000ppm
Increments  0.5%LEL (0-100%LEL)


0.1% vol 



Samples 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 battery x 3)( option)

Continous Supply  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 Rating  IP-67
Explosion Proof  Intrinsically safe (Ex ia II CT4)(ATEX/IECEx)
Approvals  ATEX/IECDx . TIIS . MED 
Other Functions  LCD backlight , Datalogger , Log data , Peak Hold , Pump stop function
Transmission Method  IrDA for Datalogger

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