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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, and HS-01 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.
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 .
* The GP-01 has an optional rechargeable battery pack.
Model Name OX-01 CO-01 HS-01 GP-01
Gas Detected Oxygen (O2) Carbon Monoxide (CO) Hydrogen Sulfide (H2S) Combustible gas
Detection Principle Galvanic cell Electrochemical Catalytic combustion
Detection Range
(Increments)
0 – 40%vol.
(0.1% 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 10.0 ppm
2nd 30.0 ppm
TWA 10.0 ppm
STEL 15.0 ppm
Over 100.0 ppm
1st 10% LEL
2nd 50% LEL
Over 100% LEL
Alarm Types 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 Methods
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
Gas Sampling Diffusion
Response Time
T90 in 20 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
Continuous Operation Alkaline dry cell: more than 3,000 hours (at 25°C, no backlight) Alkaline: 16 hours
Ni-Cad: 8 hours
Safety Rating CSA classified, “C/US”, as intrinsically safe. Class I, Division 1, Groups A, B, C, D
Dimensions & Weight 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
Operating Temp. &
Humidity
-4°F ~ 122°F (-20°C ~ 50°C);
Humidity below 90% RH (non-condensing)
Standard Accessories • Rubber protective boots • Belt clip or alligator clip
• Alkaline batteries • Wrist strap
Optional Accessories • Calibration cap (adapter) • Charger unit (GP-01 only)
• Calibration kit • Ni-Cad battery pack (GP-01 only)
Special Functions • Manual backlight for LCD (automatically lit during alarm)
• Peak hold, STEL & TWA
Warranty Two years material and workmanship
OX-01, 0-40% O2 with alkaline and alligator clip............................................................72-0008RK-01
OX-01, 0-40% O2 with alkaline and belt clip..................................................................72-0008RK-03
CO-01, 0-500 ppm with alkaline and alligator clip..........................................................73-0044RK-01
CO-01, 0-500 ppm with alkaline and belt clip.................................................................73-0044RK-03
HS-01, 0-100 ppm with alkaline and alligator clip...........................................................73-0046RK-01
HS-01, 0-100 ppm with alkaline and belt clip..................................................................73-0046RK-03
GP-01, 0-100% LEL with alkaline and alligator clip........................................................73-0033RK-01
GP-01, 0-100% LEL with alkaline and belt clip...............................................................73-0033RK-03
GP-01, 0-100% LEL with Ni-Cad, 115 VAC charger, and alligator clip...........................72-0034RK-01
GP-01, 0-100% LEL with Ni-Cad, 115 VAC charger, and belt clip..................................72-0034RK-03
GP-01, 0-100% LEL with Ni-Cad battery pack, 12 VDC charger, and alligator clip.......72-0034RK-04
GP-01, 0-100% LEL with Ni-Cad battery pack, 12 VDC charger, and belt clip..............72-0034RK-05
Features
• 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
