RKI Instruments

RKI Instruments CX-04 Series CO/O2 Single Gas Monitor 73-0069

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Out of stock


Out of stock? We recommend the RKI Instruments GasWatch 3 CO/O2 monitor or the GX-2009 Portable Multi Gas Detector & Monitor, as a great substitute that are available and ready to ship.

RKI Instruments CX-04 Series CO/O2 Single Gas Monitor is dual gas version simultaneously monitors for both O2 and CO with a combo sensor. This monitor is designed to operate for many years with field replaceable sensors and filters. With a protective rubber boot and an IP-67 rating, the 04 Series is built to operate for a long time.

Applications: Hazardous material, Mining Refineries / petrochemical, Water / wastewater treatment, Pharmaceuticals, Utilities, Chemical plants, Fire services

Key Features:

  • 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
  • Data log 10 to 600 hours with adjustable intervals
  • Audible / visual / vibration alarms
  • Automatic backlight
  • Low battery alarm
  • Intrinsically safe, ATEX and C / US approvals
  • 3 year warranty 


  • Gas Detected: Carbon Monoxide and Oxygen
  • Detection principle: Electrochemical
  • CO Detection range: 0 ~ 2000 ppm (1 ppm)
  • O2 Detection range: 0 ~ 40% (0.1%)
  • CO Alarm set points: 1st 25 ppm, 2nd 50 ppm, 3rd 1200 ppm, TWA 25 ppm, STEL 200 ppm
  • O2 Alarm set points 19.5 % LL: 18.0% H: 25.0 %
  • Alarm types: Gas alarms: 1st, 2nd and 3rd (user adjustable), OVER alarm, STEL and TWA, Trouble alarms: Sensor connection, low battery, circuit failure, and calibration range error
  • Gas sampling: Diffusion
  • Response time: T90 in 30 seconds
  • CO Accuracy: < 300 ppm ± 5 % of reading, > 300 ppm ± 20 % of reading
  • O2 Accuracy: < 25% ± 0.5 % > 25% ± 3.0 %
  • Data logging: 10 second intervals = 5 hours, 5 minute intervals = 150 hours, 10 minute intervals = 300 hours Instrument records alarms, alarm trends, gas readings, calibration & bump test history, instrument information and settings.
  • Continuous operation: Alkaline dry cell: 4,600 hours
  • Safety rating: ATEX/IECEx approved. QPS classified, “C / US”, as intrinsically safe, Class I, Division 1, Groups A, B, C, D
  • Enclosure: Dust and water resistant with IP-67 rating
  • Display: Digital LCD, gas name & concentration, auto backlighting during alarm, operation icon, battery icon

Monitor Includes:

  • Rubber protective boot
  • Alkaline batteries
  • Alligator clip
  • Data log software

Please Note: Once activated, these units cannot be shut down and will continue to run for their life span prohibiting these items from being shipped because the alarm may be activated during transit. Additionally, these items are unable to be resold after activation. Of course, if you haven't yet activated your monitor, we will happily take it back.

Optional Accessory: Downloading cable, USB / IrDA adapter

Specification Sheet: Specification Sheet

04 Series User Setup Program Operator’s Manual: 

04 Series Data Logger Management Program Operator’s Manual: 04 Series Data Logger Management Program Operator’s Manual

Part Number:

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Additional Information

Gas Type:
Carbon Monoxide (CO), Oxygen (O2)
Country of Origin:
0.18 LBS
2.10 (in)
2.64 (in)
0.94 (in)
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