Smallest & lightest 5 gas monitor, LEL, O2, CO, & H2S, with option for IR or toxic sensors

Riken Keiki Model GX-3R Pro 4 Gas model with Man down , Panic Alarm , Bluetooth (IOS and Android ) Flip screen function LEL / O2 /H2S / CO with ATEX . MED Pending with Li Ion battery and charger and standard accessories


SHA defines the breathing zone as a ten inch radius around the worker's nose and mouth, and requires that worker exposure monitoring air samples be collected in the breathing zone. Air sampling filters may be attached to the collar or lapel. Traditionally this means only a single gas monitor would be small enough for a worker to practically wear a gas monitor ‘In the breathing zone’. Now there is a 4 gas monitor smaller than many single gas monitors.

The GX-3R is the worlds smallest 4 gas monitor weighing only 3.52 ounces and can comfortably be clipped within a worker's breathing zone (2.2” W x 2.55” H x 1.02” D). It simultaneously monitors and displays LEL combustibles, O2, CO (Hydrogen compensated CO also available), and H2S.

The GX-3R represents the latest evolution of gas detection technology utilizing a new generation of micro sensors. The LEL sensor has a unique design with two active filaments in one sensor to increase it’s resistance to silicone poisoning. If one filament gets poisoned the second filament takes over. The new O2 sensor is electrochemical with a 5 year life span. H2S and CO are now available in a combo micro sensor.

Safety supervisors will appreciate the non-compliance indicator. The instrument flashes it’s 3 LED lights every 30 seconds in the following conditions; if the instrument has not been bump tested, or if calibration is due, or if there was a gas alarm event. The 3 LED lights will continue to flash once every 30 seconds until the non-compliance condition has been resolved. The 30 second interval is adjustable.

Smallest & lightest multi gas monitor
2.9" W x 2.6" H x 1.06" D , 4.58 ounces
Simultaneous detection of up to 5 gases
LEL, O2, H2S, CO or H2 Compensated CO sensor
5th channel for infrared or toxic sensors
Two of the four sensor slots have interchangeable sensors providing flexible configurations, which can easily be changed in the field.
Simple 2-button operation
Bluetooth communication with iOS & Android App
Non-Compliance Indicator
3 user adjustable alarm levels
Panic Alarm — Tap instrument twice
Man Down Alarm
Impact resistant body with removable rubber boot
Large full dot, auto-backlit display with auto-rotation
9 languages
Field replaceable sensors & filters
Water and dust resistant design, IP66/68
3 Year warranty


Unit Price

Technical Information

  • Sampling Method Diffusion sampling standard (hand aspirator or clip-on motorized pump optional)
  • Display Digital LCD displays with 7 segment plus 14 segment plus icon
  • Types of Alarms Gas Alarm: 3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing. Trouble alarm: Sensor disconnection, low battery, circuit error, calibration range error
  • Display of Alarm Gas Alarm: Flashing LEDs, continuous buzzer (100 db @ 30 cm), flashing gas value, vibration Trouble alarm: Flashing LEDs, intermittent buzzer (95 db @ 30 cm), display of error message
  • Operating Temp. & Humidity -20°C ~ +50°C [ -4°F ~ +122°F ], 10 to 90% RH, non-condensing (continuous environment) -40°C ~ +60°C [ -40°F ~ +140°F ], 0 to 95% RH, non-condensing (temporary environment, 15 minutes)
  • Response Time Within 30 seconds (T90)
  • Power Source Lithium-ion battery, Approx. 25 hours after a 3 hour full charge
  • Approvals ATEX, CSA (Pending)
  • Dimension & Weight 2.2” W x 2.55” H x 1.02” D (Approx. 58 W x 65 H x 26 D mm), 3.52 ounces (approx. 100 g) without rubber booth 2.4” W x 2.63” H x 1.06” D (Approx. 61 W x 67 H x 27 D mm), 3.70 ounces (approx. 105 g) with rubber booth
  • Case Material Explosion proof, dust and water resistant to IP-66/68 (2m,1h) approval. Drop height 23 ft
  • Controls Two buttons: POWER / MODE, AIR
  • Datalogging Logs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Interval Trends

+44 (0)114 285 3040 | sales@im-m.co.uk | service@im-m.co.uk