RKI Instruments

RKI Instruments CO-04 Series CO(-H2) Single Gas Monitor 73-0067

Ships in 1 - 2 weeks
3 Year Warranty
  • RKI01-73-0067-Product_Image_1
  • RKI01-73-0067-Product_Image_2
RKI Instruments
RKI Instruments CO-04 Series CO(-H2) Single Gas Monitor 73-0067
3 Year Warranty


RKI Instruments CO-04 Series H2 compensated CO Single Gas 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 with a 3 year warranty 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:

  • CO with H2 elimination
  • Operates 3,000 hours on replaceable alkaline batteries
  • Digital LCD readout
  • Easy "Turn On" and "Turn Off" by pressing down on the Power Mode button
  • 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 on material and workmanship including sensors


  • Gas Detected: Carbon Monoxide
  • Detection principle: Electrochemical
  • Detection range: 0 ~ 2000 ppm (1 ppm)
  • Alarm set points: 1st 25 ppm, 2nd 50 ppm, 3rd 1200 ppm, TWA 25 ppm, STEL 200 ppm
  • 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
  • Accuracy: < 300 ppm ± 5 % of reading, > 300 ppm ± 20 % of reading
  • 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: 6,200 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 readout, gas name & concentration, auto backlighting during alarm, operation icon, battery icon

Monitor Includes:

  • Rubber protective boot
  • Alkaline batteries (2-AAA size)
  • Alligator clip
  • Data log software

Optional Accessory: Downloading cable, USB / IrDA adapter

Specification Sheet: Specification Sheet

CO-04 Manual: CO-04 Manual

04 Series User Setup Program Operator’s Manual: 04 Series User Setup Program Operator’s Manual

04 Series Data Logger Management Program Operator’s Manual: 

Part Number:

View AllClose

Additional Information

Gas Type:
Carbon Monoxide (CO)
Country of Origin:
0.18 LBS
2.10 (in)
2.64 (in)
0.94 (in)
View AllClose