Gas Detection For Life

Leading gas detector manufacturer


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01 Series

This product has been discontinued

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Single Gas Personal Monitors

Single Gas Detector 01 SeriesModels OX-01, CO-01, HS-01, GP-01
Individuals need personal protection in hazardous areas at all times without adding extra bulky equipment, and the 01 Series can provide that kind of protection at an affordable price. The GP-01, OX-01, CO-01, HS-01 and HS-01S models are personal single gas monitors designed for personal protection from combustible hydrocarbons, oxygen deficiency, hydrogen sulfide, or carbon monoxide. Each model is controlled by a microprocessor for reliability and advanced capabilities. Each model can be operated continuously for at least 3,000 hours on (2) AAA size alkaline batteries except the GP-01, which operates for 16 hours. The 01 models have 2 preset alarms that are user adjustable and each version is also equipped with visual, audible, and vibration alarms as standard. The replacement sensors are inexpensive, easily field replaceable, have a life expectancy of 2 years, and are interchangeable with other RKI monitors such as the GX-2001, GX-2003, and GasWatch 2 models.

  • Features
  • Specifications
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  • 4 Gases to choose from: LEL, CO, H2S, or O2
  • Operates 3,000 hrs. on alkaline batteries (16 hours for LEL version)
  • Pocket size 1.4”(W) x 4.1”(H) x 0.8”(D)
  • Light weight 3.5 ounces
  • Audible / visual / vibration alarms
  • Automatic backlight during alarm
  • Peak Hold, STEL & TWA
  • Low battery alarm
  • Impact and water resistant
  • Intrinsically safe, CSA, C / US classified
  • 2 year warranty
  • Hazardous Material
  • Mining
  • Refineries / Petrochemical
  • Water / Wastewater Treatment
  • Pharmaceuticals
  • Utilities
  • Chemical Plants
  • Fire Services

The entire 01 Series monitors are safe for use in hazardous locations, classified as intrinsically safe by CSA to U.S. and Canadian standards for Class I, Division 1, Groups A, B, C, and D atmospheres. For additional information please visit our web site at

Model Name
OX-01 CO-01 HS-01 GP-01
Gas Detected
Oxygen (O2)
Carbon Monoxide (CO)
Hydrogen Sulfide (H2S)
Combustible gas
Galvanic cell
Catalytic combustion
0 – 40%vol.
0 – 500 ppm
(1 ppm)
0 – 100 ppm
(0.5 ppm)
0 – 100% LEL
(1% LEL Increments)
Alarm Set Points Low 19.5%vol.
High 23.5%vol.
Over 40.0%vol.
1st 25 ppm
2nd 50 ppm
TWA 25 ppm
STEL 200 ppm
Over 500 ppm
1st 10 ppm
2nd 30 ppm
TWA 10 ppm
STEL 15 ppm
Over 100 ppm
1st alarm 10% LEL
2nd alarm 50% LEL
Over alarm 100% LEL
Types of Alarms
    Gas alarms: 1st and 2nd (user adjustable), OVER alarm, STEL and TWA
    Trouble alarms: Sensor connection, low battery circuit failure, and calibration range error
Alarm Indication
    Gas alarm: Flashing LED's, intermittent buzzer, flashing gas value, and vibration
    Trouble alarm: Flashing LED's, intermittent buzzer, and display of error message
    STEL & TWA alarms: Flashing LED's, intermittent buzzer, flashing gas value, and vibration
Preset Alarms
(User Adjustable)
T90 in 30 seconds
(alarms within 5
seconds when
exposed to 12% O2)
T90 in 30 seconds
Accuracy +/- 0.5%vol. +/- 5 ppm
(up to 150 ppm)
+/- 1.5 ppm (up to 30 ppm)
+/- 5% of full scale
Power Alkaline dry cell (2-AAA size)
Alkaline dry cell
Ni-Cad battery pack
Alkaline dry cell: more than 3,000 hours
(at 25°C, no backlight)
Alkaline: 16 hours
Ni-Cad: 8 hours
Safety CSA classified, "C/US", as intrinsically safe. Class I, Div. 1. Group A, B, C & D
Dimension &
1.4”W x 4.1”H x 0.8”D, (35 x 105 x 20mm); 3.5 ounces (100g)
Display 7-segment + symbol on digital LCD, auto backlighting during alarm
Special Functions Manual backlight for LCD (automatically lit during alarm)
Peak hold, STEL & TWA
Operating Temp.
& Humidity
-4°F ~ 122°F (-20°C ~ 50°C);
Humidity below 90% RH (non-condensing)
Rubber protective boots
Belt clip or alligator clip
Wrist strap
Alkaline batteries
Calibration cap (adapter)
Charger unit
Calibration kit
Ni-Cad battery pack
Two years material and workmanship


Specifications subject to change without notice. 

Introduction | Description | Start Up | Operation | Set Alarm Points
Calibration | Maintenance

This video is also available on Youtube and CD (by request)