RKI Instruments

RKI Instruments CO-04 Series CO Single Gas Monitor 73-0065

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Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 10 - 24 and pay only $96.00 each
Buy 25 or above and pay only $94.00 each
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Now: $99.00
Was: $195.00


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RKI Instruments CO-04 Series CO Single Gas Monitor is is a single-gas toxic personal monitor 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:

  • Personal monitoring for CO
  • 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
  • Alligator clip with 360° rotation
  • 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 ~ 2000.00 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: 0 - 500 ppm: ± 5% of reading or ± 5 ppm CO (whichever is greater), 510 - 2,000ppm: ± 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: 3,000 hours (at 25°C, no backlight)
  • 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

Brochure: Brochure

Specification Sheet: Specification Sheet

CO-04 Manual: CO-04 Manual

04 Series User Setup Program Operator’s Manual: 

04 Series Data Logger Management Program Operator’s Manual: 

Part Number:

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Additional Information

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