04 Series

  • CO-04C, Carbon Monoxide (CO) 0-2,000 ppm with H2 compensation, alkaline batteries and alligator clip

    CO-04C, Carbon Monoxide (CO) 0-2,000 ppm with H2 compensation, alkaline batteries and alligator clip

    $495.00
  • CX-04, Carbon Monoxide (CO) 0-2,000 ppm and Oxygen (O2) 0-25%, alkaline batteries with alligator clip

    CX-04, Carbon Monoxide (CO) 0-2,000 ppm and Oxygen (O2) 0-25%, alkaline batteries with alligator clip

    $495.00
  • SC-04, Hydrogen Cyanide (HCN) 0-30 ppm, alkaline batteries with alligator clip

    SC-04, Hydrogen Cyanide (HCN) 0-30 ppm, alkaline batteries with alligator clip

    $495.00

04 Series

The 04 Series toxic single gas monitor is designed to operate for many years with field replaceable sensors and filters.

The HCN, NO2, PH3, and SO2 versions can be operated continuously for at least 3,000 hours on (2) AAA size alkaline batteries. The 04 models have 2 preset alarms that are user adjustable. Each version is also equipped with visual, audible, and vibration alarms as standard.

Each 04 Series monitor is impact, dust, and water resistant with an IP-67 rating. 04 Series instruments are safe for use in hazardous locations, classified as intrinsically safe ATEX/IECEx and by QPS to U.S. and Canadian standards for Class I, Division 1, Groups A, B, C, and D atmospheres.

The replacement sensors are inexpensive, easily field replaceable, and are interchangeable with other popular RKI instruments like the GX-3R, GX-3R Pro, and GasWatch 3.
  • Personal monitoring for HCN, NH3, NO2, PH3, or SO2
  • CO with H2 elimination
  • O2 / CO combo sensor
  • Operates 3,000 hours on alkaline
  • Pocket size 2.1”(W) x 2.6”(H) x 0.9”(D)
  • Light weight 2.8 ounces
  • Impact, dust, and water resistant (IP-67)
  • Replaceable rubber boot
  • Datalog 5 to 300 hours with adjustable intervals
  • Audible / visual / vibration alarms
  • Automatic backlight
  • Low battery alarm
  • Intrinsically safe, ATEX and C / US approvals
  • 3 Year warranty on material and workmanship including sensors (1 year warranty for Ammonia and sensor)
  • Hazardous material
  • Mining
  • Refineries / petrochemical
  • Water / wastewater treatment
  • Pharmaceuticals
  • Utilities
  • Chemical plants
  • Fire services
Model NameSC-04 HCNSC-04 NO2SC-04 PH3SC-04 SO2CO-04 (-H2)CX-04
Gas DetectedHydrogen CyanideNitrogen DioxidePhosphineSulfur DioxideCarbon MonoxideCOO2
Detection PrincipleElectrochemical
Part #73-007173-007373-007973-008373-006773-0069
Detection Range (Increments)0 ~ 30.0 ppm (0.1 ppm)0 ~ 20.00 ppm (0.05 ppm)0 ~ 20.00 ppm (0.01 ppm)0 ~ 100.0 ppm (0.05 ppm)0 ~ 2000 ppm (1 ppm)0 ~ 40% (0.1%)
Alarm Set Points1st: 5.0 ppm1st: 2.00 ppm1st: 0.30 ppm1st: 2.00 ppm1st: 25 ppmL: 19.5%
2nd: 10.0 ppm2nd: 4.00 ppm
2nd: 0.60 ppm2nd: 5.00 ppm2nd: 50 ppmLL: 18.0%
3rd: 30.0 ppm3rd: 20.00 ppm3rd: 0.60 ppm3rd: 100.00 ppm3rd: 1200 ppmH: 25.0%
TWA: 4.7 ppmTWA: 0.50 ppmTWA: 0.30 ppmTWA: 2.00 ppmTWA: 25 ppm
STEL: 10 ppmSTEL: 1.00 ppmSTEL: 1.00 ppmSTEL 5.00 ppmSTEL: 200 ppm
Alarm TypesGas alarms:1st, 2nd and 3rd (user adjustable), OVER alarm, STEL and TWA
Trouble alarms:Sensor connection, low battery, circuit failure, and calibration range error
Alarm MethodsGas 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 SamplingDiffusion
Response TimeT90 in 30 seconds
Accuracy (whichever is greater)± 10% of reading or ± 5 % of full scale< 300 ppm ± 5 % of reading< 25% ± 0.5 %
> 300 ppm ± 20 % of reading> 25% ± 3.0 %
Data Logging10 second intervals = 10 hours, 5 minute intervals = 300 hours, 10 minute intervals = 600 hours
Instrument records alarms, alarm trends, gas readings, calibration & bump test history, instrument information and settings.
Battery OptionsAlkaline dry cell (2-AAA size)
Continuous Operation3,000 hours (at 25°C, no backlight)6,200 hours4,600 hours
Safety RatingATEX/IECEx approved. QPS classified, “C / US”, as intrinsically safe, Class I, Division 1, Groups A, B, C, D
EnclosureDust and water resistant with IP-67 rating
Dimensions2.1” W x 2.64” H x 0.94” D (54 x 67 x 24 mm)
Weight2.8 ounces (80 g)
DisplayDigital LCD, gas name & concentration, auto backlighting during alarm, operation icon, battery icon
Operating Temperature-4°F ~ 122°F (-20°C ~ 50°C)
HumidityHumidity below 90% RH (non-condensing)
Standard Accessories• Rubber protective boot
• Alligator clip
• Data logging software
• Alkaline batteries
Optional Accessories• Calibration cap
• Wrist strap
• Calibration kit
• Belt clip
• Data logging download cable
Special Functions• Manual backlight for LCD (automatically lit during alarm)
• Peak hold, STEL & TWA
Warranty3 Year warranty
  • Placeholder

    Alligator clip assembly, 04 Series

    $35.00
  • Placeholder

    Charcoal filter disk for CO sensor, CF-6280 for Gaswatch 3 and 04 Series (pack of 5)

    $14.00
  • Placeholder

    H2S filter disc for HCN sensor, 04 Series

    $16.00
  • Placeholder

    H2S filter disc for SO2 or NO2 sensors, 04 Series

    $2.00
  • Placeholder

    H2S filter set (pack of 5) for HCN sensor, 04 Series

    $74.00
  • Placeholder

    H2S filter set (pack of 5) for SO2 or NO2 sensors, 04 Series

    $8.80
  • Placeholder

    Humidity filter disk for H2S or PH3 sensor (pack of 5) for GasWatch 3 / 04 Series

    $8.80
  • Placeholder

    Humidity filter disk for H2S or PH3 sensor for GasWatch 3 / 04 Series

    $2.00
  • Placeholder

    Sensor gasket for 03 series

    $2.00
  • Placeholder

    Screw, M 2 x 8 mm, pan head phillips, with washer, SUSXM7, for 03 series

    $4.00
  • Wrist strap

    Wrist strap, GX-2009/GX-2012

    $4.00
  • Placeholder

    Belt Clip for 03 series

    $18.00
  • Placeholder

    Spring bar with outer tube for 03 Series and wrist band of GasWatch 2/GasWatch 3

    $1.40
  • Placeholder

    Rubber boot for 03 series

    $14.00
  • Placeholder

    Battery, alkaline, AAA

    $1.20
  • Placeholder

    Battery, Ni-MH, AAA, Eneloop by Panasonic

    $12.60
  • Placeholder

    Calibration adapter for 03 series

    $30.00
  • Placeholder

    Charger, Ni-MH, charges four AA or AAA size with A/C adapter and DC vehicle plug

    $36.00
  • Downloading Cable, USB/IrDA adapter

    $220.00
  • Placeholder

    Sensor Combo, EC, Carbon Monoxide (CO) 0-300 ppm/Oxygen (O2) 0-25% vol. for GasWatch 3 and 04 Series

    $240.00
  • Sensor, Sulfur Dioxide (SO2) 0-100 ppm for GX-3R Pro/SC-04

    $240.00
  • Sensor, Carbon Monoxide (CO) 0-2000 ppm with H2 compensation for GX-3R/GX-3R Pro/GasWatch 3/04 Series

    $240.00
  • Sensor, Hydrogen Cyanide (HCN) 0-30 ppm for GX-3R Pro / SC-04

    $240.00
  • Sensor, Nitrogen Dioxide (NO2) 0-20 ppm for GX-3R Pro / SC-04

    $240.00
  • Sensor, Phosphine (PH3) 0-20.00 ppm for GX-3R Pro / SC-04

    $240.00
  • RKI 04 Series Calibration Kit, CO-04C, 34L cyl CO 50 ppm in N2, 34L cyl H2 200 ppm in air

    RKI 04 Series Calibration Kit, CO-04C, 34L cyl CO 50 ppm in N2, 34L cyl H2 200 ppm in air

    $295.00
  • RKI 04 Series Calibration Kit, CX-04, 34L cyl CO 50 ppm in N2, regulator, cal cup, case & tubing

    RKI 04 Series Calibration Kit, CX-04, 34L cyl CO 50 ppm in N2, regulator, cal cup, case & tubing

    $295.00
  • RKI 04 Series Calibration Kit, SC-04, 34AL cyl HCN 10 ppm in N2, regulator, cal cup, case & tubing

    RKI 04 Series Calibration Kit, SC-04, 34AL cyl HCN 10 ppm in N2, regulator, cal cup, case & tubing

    $475.00
  • RKI 04 Series Calibration Kit, SC-04, 34AL cyl NO2 10 ppm in N2, regulator, cal cup, case & tubing

    RKI 04 Series Calibration Kit, SC-04, 34AL cyl NO2 10 ppm in N2, regulator, cal cup, case & tubing

    $475.00
  • RKI 04 Series Calibration Kit, CO-04C, 34L cyl CO 50 ppm in N2, 34L cyl H2 200 ppm in air

    RKI 04 Series Calibration Kit, SC-04, 34AL cyl PH3 0.5 ppm in N2, regulator, cal cup, case & tubing

    $475.00
  • RKI 04 Series Calibration Kit, SC-04, 34AL cyl SO2 5 ppm in N2, regulator, cal cup, case & tubing

    RKI 04 Series Calibration Kit, SC-04, 34AL cyl SO2 5 ppm in N2, regulator, cal cup, case & tubing

    $365.00

  • SC-04, Nitrogen Dioxide (NO2) 0-20 ppm, alkaline batteries with alligator clip

    SC-04, Nitrogen Dioxide (NO2) 0-20 ppm, alkaline batteries with alligator clip

    $495.00
  • SC-04, Phosphine (PH3) 0-20.00 ppm, alkaline batteries with alligator clip

    SC-04, Phosphine (PH3) 0-20.00 ppm, alkaline batteries with alligator clip

    $495.00
  • SC-04, Sulfur Dioxide (SO2) 0-100 ppm, alkaline batteries with alligator clip

    SC-04, Sulfur Dioxide (SO2) 0-100 ppm, alkaline batteries with alligator clip

    $495.00