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RKI GX-2009 4-Gas Monitor (LEL,O2, H2S & CO) Calibrated for CH4

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Simultaneous detection of 4 gases, LEL, O2, H2S & CO . The smallest / lightest four gas monitor on the market.
AU$753.04 AU$684.58


  • Simultaneous detection of 4 gases, LEL, O2, H2S & CO 
  • Smallest / Lightest four gas monitor on the market 70 H x 70 W x 25 D mm, 130g
  • Dual audible alarm ports (95 db @ 30 cm) 
  • 3 visual alarm LED’s 
  • Vibration alarm 
  • IP-67 water-resistant/dustproof design 
  • Calibration and bump test lock out or reminder controls 
  • Large capacity data logging standard 
    • 8 alarm trends
    • Log time range of 10 to 300 hrs
    • 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, CSA, C/US classified, IECEx / ATEX approved
  • 2 year warranty


Riken Keiki GX-2009 4-Gas Monitor (LEL,O2, H2S & CO)

The GX-2009 gas detector model is the smallest and lightest 4-gas monitor in the world. Weighing only 130g, it fits in the palm of your hand (70 H x 70 W x 25 D mm).

The GX-2009 simultaneously monitors and displays combustibles, oxygen, carbon monoxide, and hydrogen sulphide. 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 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. 

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.

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, Vista and Windows 7 compatible. The GX-2009 is also functional with the SDM-2009 docking and calibration station.


  • Personal monitoring 
  • Confined spaces 
  • Refineries/petrochemical 
  • Utilities 
  • Hazardous material 
  • Water/wastewater 
  • Fire services 
  • Construction


Technical Specifications

Gas Detected
Combustible Gases (Methane as standard)
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 ~ 40.0% Vol.
(0.1% Vol.)
0 ~ 100.0 ppm (0.5 ppm) 0 ~ 500 ppm (1 ppm)
Accuracy Statement ± 5% of reading or ± 2% LEL (whichever is greater) ± 0.5% O2 ± 5% of reading or ± 2 ppm H2S (whichever is greater) ± 5% of reading or ± 5 ppm CO
(whichever is greater)
Sampling Method Diffusion sampling standard / hand aspirator or motorized pump optional
Display Digital LCD displays all four gases simultaneously, with auto backlight
Preset Alarms  
(User Adjustable)
Overscale alarm
1st alarm 10% LEL
2nd alarm 50% LEL 
Over alarm 100% LEL
Low alarm 19.5%
High alarm 23.5%
Over alarm 40.0%
1st alarm 5 ppm
2nd alarm 30 ppm
TWA alarm 1 ppm
STEL alarm 5 ppm
Over alarm 100 ppm
1st alarm 25 ppm
2nd alarm 50 ppm
TWA alarm 25 ppm 
STEL alarm 200 ppm
Over alarm 500 ppm
Types of Alarms Gas Alarm: 2 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, intermittent buzzer (95 db @ 30 cm), flashing gas value, vibration 
Trouble alarm: Flashing LEDs, intermittent buzzer (95 db @ 30 cm), display of error message
Operating Temp. & Humidity -4°F to 122°F (-20°C ~ +50°C), 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 / Approvals IECEx zone 0 Ex ia IIC T4; ATEX II 1G Ex ia IIC T4; 
c CSA us classified, as intrinsically safe. Class I, Division 1, Groups A, B, C, D
Dimension & Weight 2.7” H x 3” W x 1” D (Approx. 70 H x 75 W x 25 D mm), 4.6 ounces (approx. 130 g)
Case Material High impact over molded rubber. Dust and water resistant with IP-67 approval.
Controls Two glow in the dark buttons: POWER / MODE, AIR
Datalogging Standard with all instruments. Stores 8 alarm trend sessions where readings are recorded 30 minutes
before and after an alarm event. 3,600 data point capacity with a log time range of 10 to 300 hours 
(based on programmable interval times); and stores up to 100 calibration records.
Required Accessories Battery charger
Standard Accessories Alligator clip 13-0116RK
NiMH batteries (set of 2) 49-1609RK
Charging station with 115/220 VAC power supply (also available without power supply, 49-2170RK) 49-2170RK-01
Product CD (includes datalogging software) 71-8002RK
Optional Accessories Belt Clip 13-0117RK
Padded carrying case for GX-2009 and accessories 20-0112RK-01
Charging station, 115/220 VAC powered for 2, 3, 4, or 5 instruments 49-2170RK-XX
Charging station with 12 VDC power supply and vehicle adapter plug 49-2171RK 
12 VDC adapter with vehicle plug (does not include charger base) 49-2020RK
RP-2009 pump with 4” rubber nipple, 10’ hose and probe (up to 40’ hose available) 81-1177RK
RP-6 sample drawing pump with 10’ hose and probe (up to 40’ hose available) 81-1166RK
Hand aspirated sample draw with 10’ hose and probe (up to 40’ hose available) 81-1160RK
USB to IrDA downloading cable 47-5027RK
SDM-2009 single calibration station 81-SDM2009-01
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
• Single gas LEL, O2, CO, H2S
Warranty Two years material and workmanship


More Information
Manufacturer Riken Keiki (RKI)
Type Gas Monitors
Size / Operation Handheld, Pocket-sized, Rugged
Protection Level IP65 Dust-Proof, IP67 Waterproof
Device Connectivity via USB
Industry Installers and Contractors (OSP), Telecommunications, Mining, Off-shore and Remote, Transportation, Utilities
Applications Long-haul installation, OSP (Out Side Plant), Industrial Environments, Installers and Telco Contractors, Network Testing
Operating Temp. (Min) -20°C
Operating Temp. (Max) 50°C
Recommended Calibration Interval 1 Year
Standard Package Contains
  • GX-2009 Gas Monitor
  • Alligator clip
  • NiMH batteries (set of 2)
  • Charging Station with 220 VAC power supply
  • Operating Manual
Warranty 2 Years
Warranty Notes AusOptic Genuine Product Guarantee
Authorised distributor, benefit from manufacturer-backed, local warranty coverage, genuine parts, and our experienced local support team
Attached Files
Brochures and Specifications
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