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Multi-gas Portable Monitors » Riken Keiki GX-2009

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  • Simultaneous detection of 4 gases,
    LEL, O2, H2S & CO
  • Smallest / Lightest 4 gas monitor
    on the market
    - 70mm (H) x 75mm (L) x 25mm (D), 130g
    - 2.7” (H) x 3” (W) x 1” (D), 4.6 oz
  • Dual audible alarm ports (95 db @ 30 cm)
  • 3 visual alarm LED’s
  • Vibration alarm
  • IP-67 Waterproof/dustproof design
  • Calibration lock out or reminder controls
  • Large capacity data logging standard
    - 8 alarm trends
    - Log time range of 10 to 300 hours
    - 100 calibration records
  • 20 hours of operation (NiMH batteries)
  • Large LCD display screen
  • Automatic backlighting at alarm
  • Impact resistant over-mold body,
    RFI shielded body
  • STEL and TWA readouts
  • Intrinsically safe, IECEx / ATEX approved
    (CSA, C/US pending)
    MED approved
  • 2 year warranty


  • Personal monitoring
  • Confined spaces
  • Refineries/petrochemical
  • Utilities
  • Hazardous material
  • Water/wastewater
  • Fire services
  • Construction
English Datasheet
Operator's Manual
Datalogging Manual

The GX-2009 is the smallest and lightest 4-gas monitor in the world. The GX-2009 weighs only 130grams and fits in the palm of your hand (70mm (H) x 75mm (L) x 25mm). The GX-2009 simultaneously monitors and displays combustibles (HC), oxygen (O2), carbon monoxide (CO), and hydrogen sulfide (H2S). The GX-2009 represents the latest evolution of gas detection technology. Advancements include dual audible alarm ports and alarm LED’s on 3 sides of the instrument, so that alarm conditions are obvious from multiple perspectives especially in high noise environments. Other features include a waterproof and dustproof design with IP 67 rating, an impact resistant rubber over-mold body that is RFI resistant, and a large capacity data logging system included as a standard feature.

Other standard GX-2009 features are vibration alarm, autocalibration, calibration lock out or reminder control, STEL / TWA readings, peak hold, auto backlighting at alarm on a large LCD display, and it even tells the time! All of these controls and features are operated through 2 simple glow-in-the dark, glove friendly buttons. The NiMH battery set will operate for 20 hours and will fully charge in 3 hours.

A huge capacity data logging function is a standard feature on all GX-2009 instruments, and will store up to 8 alarm trend sessions where readings are recorded 30 minutes before and after an alarm event. The data logging has a 3,600 data point capacity with a log time range of 10 to 300 hours based on programmable interval times. The data logging software will also store up to 100 calibration records and is Windows XP and Vista compatible. The GX-2009 is also functional with the Data Cal 2000 instrument maintenance system and the SM-2009U single calibration station (available in 2009).

The GX-2009 is designed around RKI’s compact and proven sensors, utilizing catalytic combustion, electrochemical and galvanic sensor technologies. Each miniaturized sensor is manufactured with the same high quality control that has made RKI sensors and instruments the most reliable and long lasting monitoring devices in the industry.


Gas Detected
Combustible Gases (HC / CH4 calibration)
Oxygen (O2)
Hydrogen Sulfide (H2S)
Carbon Monoxide (CO)
Detection Principle Catalytic combustion Galvanic cell Electrochemical cell
Detection Range (Increments) 0~100% LEL
(1% LEL)
(0.1% vol)
0~100 ppm
(0.5 ppm)
0~500 ppm
Sampling Method Diffusion sampling, standard hand aspirator or motorized pump optional
Display Digital LCD displays all four gases simultaneously, with auto backlight
Alarm Method
Gas alarms: 1st and 2nd (user adjustable), STEL, TWA and OVER
Trouble alarms: Sensor connection, low battery, low flow, circuit trouble and calibration error
Types of Alarms
Gas Alarm: 2 increasing alarms, STEL, TWA, overscale alarm
Trouble alarm: Sensor disconnection, wire disconnection, low battery, circuit error, calibration range error
Operating Temp. & Humidity -20°C ~ +50°C (-4°F to 122°F), 0 to 95% RH, non-condensing (splash resistant)
Response Time Within 30 seconds (T90)
Continuous Operation 20 hours after a 3 hour full charge (14 hours after 90 min charge)
Power Source Direct charging NiMH batteries, set of 2
Safety Design IECEx zone 0 Ex ia IIC T4; ATEX II 1G Ex ia IIC T4; (CSA classified, “C/US”, as intrinsically safe. Class I, Division 1, Groups A, B, C, D pending)
Dimensions & Weight 2.7” H x 3” W x 1” D (Approx. 70 H x 75 W x 25 D mm), 4.6 ounces (approx. 130g)
Case Material RFI shielded high impact over molded rubber. Dust and waterproof with IP-67 approval.
Controls Two glow in the dark buttons: POWER / MODE, AIR
Required Accessories Battery charger
Standard Accessories
Battery charger, Alligator clip, NiMH batteries (set of 2)
Optional Accessories

Belt Clip
Padded carrying case for GX-2009 and accessories
Charging station, 115/220 VAC powered for 2, 3, 4, or 5 instruments
RP-6 sample drawing pump with 3m / 10’ hose and probe
Hand aspirated sample draw with 3m / 10’ hose and probe

Configurations 4 gas (LEL / O2 / H2S / CO)
3 gas (LEL / O2 / H2S)
3 gas (LEL / O2 / CO)
2 gas (LEL / O2)
2 gas (O2 / H2S)
2 gas (O2 / CO)
Two years material and workmanship

Specifications subject to change without notice.