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Portable Gas Detectors

GX-3R The worlds smallest, lightest 4 Gas Confined Space monitor

Tiny 100g Personnel 4 Gas Detector is half the Size and Weight of other comparable products

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”

RP-3R Clip on pump unit for GX-3R Click here

Product Features

Full Featured Personal 4 Gas Detector 

Long Battery Life before re-charge:

Long battery mode allows the monitor to be used continuously for up to 40 hours before recharging. IP66/68 compliance as well as a 3-year sensor warranty allows the GX-3R to be used with confidence.

3 Alarms settings and a wide detection range:

The GX-3R has 3 pre-set alarm settings per gas and an over alarm which allows the alarms to be set at EH40 workplace exposure limits plus an additional alarm for a higher detection range.

An internal data logger allows 3600 event logs and 300 hours which can be read out using an IrDA link.

Wide Operating temperature range:

An Operating temperature range of -40- +60 degrees C (intermittent) -20- +50 Degrees C (continuous) allow the GX-3R to be used in many different environments and applications.

A loud 95dB alarms buzzer is also included.

New Confined Space Monitor has 3 sensor designs:

The GX-3R uses 3 compact sensors including a brand new Electro-chemical Oxygen Sensor. The GX-3R Confined Space Monitor will detect, Combustibles, Hydrogen Sulphide, Oxygen as well as Carbon Monoxide. A new 3-year sensor warranty is now standard.

Optional accessories:

An optional multi-charger is available.  Operators can charge multiple devices together saving considerable time.

In addition, a Calibration station as well Data logger adapter and software is available as an optional accessory. See SDM-3R Auto bump and calibration station here SDM-3R

The GX-3R is part of the GX-3R family together with the GX-3R Pro. 


Category Portable gas detector
Type Multi gas
Target gas LEL/O2/CO/H2S
Detection range 0~100%LEL(HC/CH4)
Sampling method Diffusion
Type of alarm Gas alarms, Fault alarms
Display of alarm Flashing light, buzzer, vibration
Explosion proof Intrinsically safe
Ingress proof rating IP66/68
Approvals ATEX, IECEx, MED Marine version also available 
Power source Direct charging Ni-MH battery pack
(Can be fast charged in just 180min)
Continuous operation Approx. 40 hours after full charge
(with long battery mode)
Dimensions & Weight Approx. 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)

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