04 Series


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