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Portable Gas Detectors

GX-3R Pro Ultra Compact Personal 5 gas Confined Space Monitor with Bluetooth

Confined Space Plus Gas Detector with options for CO2 / NH3 / HCN / NO2 / PH3 / SO2 / CL2

The new Riken Keiki GX-3R Pro is the Worlds smallest and lightest 5 Gas Personal monitor. It can mount the 4 std confined space gases plus an additional Super-toxic such as CO2 / SO2 / PH3 / HCN /NO2 / NH3 and CL2 

For RP-3R Pro Clip on Pump unit for GX-3R Pro Click here

Product Features

Measuring a tiny 73(w) x 65(H)x 26(D)mm and weighing only 120g it is a revolution in compact design. The GX-3R Pro is ideal for confined space work as its size means it does not interfere with work even if it is attached in the breathing zone.

New 5 Gas Personal Monitor has a 4-sensor design.

The GX-3R Pro uses 4 compact sensors including a brand new Electro-chemical Oxygen Sensor and miniature Toxic sensor including a tiny IR Sensor for CO2. The GX-3R Pro 5 Gas Personal Monitor will detect, Combustibles, Hydrogen Sulphide, Oxygen, and Carbon Monoxide as well as a Super-Toxic such as CO2 SO2, NO2, HCN, PH3, and NH3.  A CL2 option will be 2022. A new 3-year sensor warranty is now standard. 

Man, down Alarm and Bluetooth Connectivity:

The GX-3R Pro also features a Man, Down Alarm and Bluetooth Connectivity for the first time.

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.

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


Applications for the GX-3R include

Construction Industry.

Petrochemical plants as well as Oil refineries


Power Plants in addition to other utilities:

Underground plant rooms.

Automotive factories.

Offshore Oil platforms.

Iron as well as Steel works.

Fire as well as other Emergency Services.

The food Industry.

Semiconductor plants.

The Water and Sewage Industry.

The GX-3R Pro is part of the GX-3R family together with the GX3R 


Category Portable gas detector
Type Multi gas
Target gas LEL/O2/CO/H2S plus CO2/SO2/NO2/HCN/PH3 or NH3 ( CL2 Version 2022 ) 
Detection range


0-10000ppm / 0-5% vol (CO2) 

0-20ppm (SO2) (HCN) (PH3) (NO2) 

0-300ppm (NH3) 

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. 120g
Operating temperature & Humidity -40℃ to 60℃, (-40 to 140F)
0 to 95%RH, (Non-condensing)

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