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Multi-gas Portable Monitors » Riken Keiki GX-2003


  • Utilities
  • Personal monitoring
  • Confined space entry
  • Refineries / petrochemical
  • Chemical plants
  • Hazardous material
  • Water / wastewater treatment
  • Fire services
  • Mining


  • Three operating modes:
    Normal, Bar Hole, and Leak Check
  • Monitors LEL, and % volume methane, O2, and CO (optional H2S)
  • Barhole mode tests for peak methane and oxygen levels
  • Leak detect mode offers high sensitivity tests for ppm level natural gas leaks
  • 0 to 100% volume Methane
  • Auto-ranging display of % volume and % LEL
  • Internal sample drawing pump with up to 40' range
  • Vibration, visual, and audible alarms
  • Automatic backlight during alarms
  • Calibration reminder with lock out option
  • Ni-MH or alkaline power source (interchangeable)
  • Quick charge (complete charge in 90 minutes)
  • Glove friendly glow in the dark buttons
  • Alarm latching or non-latching
  • High impact protective rubber boot
  • Up to 600 hours of datalogging with alarm trends
  • Autocalibration or single calibration
  • TWA and STEL readings with lunch-break mode
  • Intrinsically safe, CSA, C/US classified
  • 2 year warranty


Built around high-quality micro-sensor technology, the GX-2003 is RKIs smallest personal 5-in-1 gas monitor with a built in sample pump. Weighing only 310g, it has many features which set the GX-2003 apart from the competition. For example, it can monitor the standard confined space gases (LEL combustibles, Oxygen content, Carbon Monoxide, and Hydrogen Sulfide), and it can also measure 100% volume Methane and dynamically display either % LEL, or % volume with its auto-ranging ability.

The GX-2003s large LCD display shows all gas readings, battery level, current time, and will automatically backlight in alarm conditions. This unit also has a special bar hole mode to facilitate locating underground gas leaks. A high sensitivity leak check mode is also included, and provides ppm level detection of gas leaks. A special variable frequency alarm helps to pinpoint the leak without looking at the instrument display. Other standard mode alarm types include vibration, visual, and audible alarms that can be set to latching or non-latching. Controlled by a microprocessor, the GX-2003 continuously checks itself for sensor connections, low battery, circuit trouble, low flow, and calibration errors. The GX-2003 can interchangeably operate on either a Ni-MH battery pack or 3 AA alkaline batteries. The batteries are simple to replace requiring no tools to access the battery compartment. The Ni-MH battery pack can receive a charge directly within the instrument or separately, allowing the unit to remain in service.

Calibration intervals and reminders are user adjustable and can be set to either go into alarm or to lock the user out of normal measurement mode once a calibration period has expired. Calibrations can be performed automatically or individually in single calibration mode. The GX-2003 is also compatible with the economical SM-2003 single channel calibration station.

Gas Detected
All Combustible Gases (Methane as standard)
% Volume Methane
Oxygen (O2)
Hydrogen Sulfide
Carbon Monoxide
Detection Principle Catalytic combustion Thermal conductivity Galvanic cell Electrochemical cell
Detection Range 0~100% LEL 0~100% Vol. 0~40.0% Vol. 0~100 ppm 0~500 ppm
Sampling Method Internal sample pump, flow rate nominal 0.5 LPM, includes hydrophobic filter
Display Digital LCD with 7 segments, auto backlight during alarm
Preset Alarms (User Adjustable)
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 10 ppm
2nd alarm 30 ppm
TWA alarm 10 ppm
STEL alarm 15 ppm
Over alarm 100 ppm
1st alarm 25 ppm
2nd alarm 50 ppm
TWA 25 ppm
STEL alarm 200 ppm
Over alarm 500 ppm
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 alarms: Flashing lights, two tone buzzer, and vibration
Trouble alarms: Flashing lights, trouble displayed, intermittent buzzer, and vibration
Operating Temp. & Humidity -20° C ~ + 50°C (-4 to 122°F), 0 to 85% RH, non-condensing
Response Time Within 30 seconds (T90)
Continuous Operation Alkaline battery: 14 hours
Ni-MH battery: 16 hours (fully charged)
Power Source Ni-MH battery pack, direct or separate charge, or 3 AA Alkaline dry cell batteries; interchangeable
Safety Design CSA classified, “C/US”, as intrinsically safe. Class I, Division 1, Groups A, B, C, D
Dimensions & Weight Approx. 171 (H) x 65 (W) x 39 (D) mm (5.6"H x 2.5"W x 1.5"D), approx. 310 g (11 ounces)
Case Material Dust & splash resistant. RFI shielded high impact plastic with protective rubber boot
Controls Five buttons: POWER / ENTER, DISPLAY, AIR, RESET, SHIFT (glow in the dark)
Warranty Two years material and workmanship
Standard Accessories
  • Wrist strap
  • 10" Probe
  • Rubber boot
  • 10’ Hose
  • Manual
  • Training CD
  • Quick reference card
Standard Accessories
(Leak Check/ Bar Hole Versions)
  • Wrist strap
  • Rubber boot
  • Manual
  • Training CD
  • Quick reference card
  • 10" Probe
  • 3' Hose
  • 10' Hose
  • 30" Bar hole probe
Optional Accessories
  • Datalogging software
  • Calibration kit
  • Data Cal 2000 or SM-2003 calibration stations
  • Sample draw hoses (10 standard, up to 40 max. available)
  • AC or DC Charger
  • Ni-MH battery pack
  • Carrying case
Configurations 3, 4, or 5 sensor units
Ni-MH or alkaline battery options
Warranty Two years material and workmanship

Specifications subject to change without notice.