General Information

RKI is proud to offer the smallest 4-gas monitor in the world, the GX-2001. Weighing only 6 ounces and about the size of a pager (2.8" H x 2.2" W x 1.1" D), the GX-2001 simultaneously monitors combustibles, oxygen, carbon monoxide, and hydrogen sulfide. The GX-2001 is armed with standard features like a vibration alarm, autocalibration, datalogging, rechargeable Ni-MH battery pack, STEL / TWA readings, peak hold and auto backlighting at alarm on a large LCD display, and it even tells the time! All of these controls and features are operated through 3 simple glow in the dark buttons. Utilizing either the standard charger or datalogging / charger station, the Ni-MH battery pack will operate for 18 hours and fully recharge in 90 minutes. Also available is the datalogging software program which is Windows 95, 98, ME, and XP compatible. The GX-2001 is also compatible with the Data Cal 2000 instrument maintenance system and SM-2001U calibration station. The GX-2001 is designed around the world's smallest gas 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.


  • Simultaneous detection of 4 gases LEL, O2, H2S and CO
  • Smallest 4 gas monitor on the market 2.8" H x 2.2" W x 1.1" D, 6 oz.
  • Audible, visual, & vibration alarms
  • Alarm trend data
  • Datalogging standard
  • Autocalibration
  • Rechargeable Ni-MH battery pack
  • Battery pack recharges in 90 minutes
  • Continuously operates for up to 18 hours
  • Large LCD display screen
  • Automatic backlighting at alarm
  • High impact, RFI shielded body
  • STEL and TWA readouts (USA Version)
  • Continuously displays current time
  • Intrinsically safe, CSA, C / US
  • 2 year warranty


  • Personal monitoring
  • Confined spaces
  • Refineries / petrochemica
  • Utilities
  • Chemical plants
  • Hazardous material
  • Water / wastewater treatment
  • Fire services
  • Mining

Standard Sensor Settings for the GX-2001

Sensor Type Calibration Gas Value Warning Alarm Low Alarm High Alarm TWA Alarm STEL Alarm Part Number
H2S - Hydrogen Sulfide 20ppm 5ppm 30ppm 100ppm 1ppm 5ppm ES-1827
CO - Carbon Monoxide 50ppm 25ppm 50ppm 1200ppm 25ppm 200ppm ES-1821
LEL - Methane Curve 50% LEL 10% LEL 25% LEL 50% LEL N/A N/A NC-6264A
O2 - Oxygen 12% O2 19.5% 18.0% 23.5% N/A N/A OS-BM2