RIken Keiki GX-3R 4 Gas Confined Space Monitor


The Riken Keiki GX-3R 4 Gas Confined Space Gas Monitor measures a tiny 58(w) x 65(H)x 26(D)mm and weighs only 100g making it a revolution in compact design. The GX-3R is ideal for use in confined spaces as its size means it does not interfere with work even if it is attached in the breathing zone. 

The breathing zone is within a 25cm radius of the worker's nose and mouth. HSE G409 COSHH General Guidance advises that “‘Personal sampling’ is taking an air sample near the worker’s breathing zone to measure the amounts of airborne substances inhaled for a stated task”


CategoryPortable gas detector
TypeMulti gas
Target gasLEL/O2/CO/H2S
Detection range0~100%LEL(HC/CH4)
Sampling methodDiffusion
Type of alarmGas alarms, Fault alarms
Display of alarmFlashing light, buzzer, vibration
Explosion proofIntrinsically safe
Ingress proof ratingIP66/68
ApprovalsATEX, IECEx, MED Marine version also available 
Power sourceDirect charging Ni-MH battery pack
(Can be fast charged in just 180min)
Continuous operationApprox. 40 hours after full charge
(with long battery mode)
Dimensions & WeightApprox. 58(W) x 65(H) x 26(D) mm
Approx. 100g
Operating temperature & Humidity-40℃ to 60℃, (-40 to 140F)
0 to 95%RH, (Non-condensing)



  • MED (WheelMark) Marine Type Approved version

    The MED version is suitable for use on marine vessels worldwide

  • Hydrogen Compensated CO sensor option

    Ideal for Hydrogen rich environments

  • HC gas list feature

    Can directly read 25 different combustible gases

  • New design R Sensor

    Long life and high performance with 3 year warranty even on O2 sensor

  • World's smallest and lightest 4 gas monitor

    Easy to wear on lapel in Breath Zone

  • Unique dual filament LEL sensor

    40 x more resistant to silicone poisoning

  • Water and dust resistant, IP66/68 with replaceable rubber boot

    Ultra robust and reliable drop tested to 7m

  • Loud alarm buzzer 95dB at 30cm

    Ideal for noisy work environments

RIken Keiki GX-3R 4 Gas Confined Space Monitor

Call for pricing

RIken Keiki GX-3R 4 Gas Confined Space Monitor

Call for pricing
Picture of Fast Delivery

Fast Delivery

Next day delevery for shown as in stock orders placed before 1:00pm

Picture of Worldwide Shipping

Worldwide Shipping

Place a purchase order, Call or email to get an international shipping quote

Picture of Secure Online Purchasing

Secure Online Purchasing

SECURED BY SECTIGO (We do not accept AMEX)

Picture of Technical Support

Technical Support

Call or email to speak to a member of the technical team