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SKU: RKI01-73-0067

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

$606.67

Ships in 10 - 12weeks

Description

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

Specifications:

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:

CO-04 Manual:

04 Series User Setup Program Operator’s Manual:

Part Number:
73-0067

Frequently Asked Questions

Why does the CO-04 Series use hydrogen compensation?

Standard electrochemical CO sensors cross-react with hydrogen (H2), generating a false positive CO reading in environments where H2 is present — such as battery charging rooms, fuel cell facilities, or certain chemical processes. The CO-04 Series uses an H2-compensated sensor design that filters out hydrogen interference, providing CO-specific readings without spurious alarms in H2-containing atmospheres. For multi-gas monitoring needs, see PK Safety’s portable gas monitors collection.

What are the OSHA exposure limits for carbon monoxide in the workplace?

OSHA establishes a Permissible Exposure Limit (PEL) for CO of 50 ppm as an 8-hour time-weighted average per 29 CFR 1910.1000. NIOSH recommends a ceiling of 200 ppm. The CO-04’s factory alarm setpoints — first alarm at 25 ppm, second at 50 ppm — are calibrated to align with these regulatory thresholds. Compliance is the employer’s responsibility; these setpoints are informational, not a guarantee of personal safety at those concentrations.

What do the STEL and TWA readings on the CO-04 monitor represent?

The TWA (Time-Weighted Average) tracks average exposure over an 8-hour shift. The STEL (Short-Term Exposure Limit) tracks the 15-minute average for peak short-duration exposures. The CO-04 is pre-set with a TWA alarm at 25 ppm and a STEL alarm at 200 ppm, consistent with ACGIH TLV guidance. Both are user-adjustable to match your site safety program requirements.

Does PK Safety service and calibrate RKI CO-04 monitors in-house?

PK Safety services RKI instruments in-house with factory-trained technicians, offering NIST-traceable CO calibration, sensor replacement, and repair for the full RKI 04 Series portable line. The CO-04 carries a 3-year warranty on material, workmanship, and sensors, and PK Safety supports warranty claims. Call 800.829.9580 to schedule service or order calibration gas for the CO-04.

What applications require an H2-compensated CO monitor?

H2-compensated CO monitoring is appropriate in battery rooms (forklift charging areas, UPS facilities), fuel cell test environments, semiconductor fabs, and any location where hydrogen off-gassing may co-exist with CO hazards. Using a non-compensated CO sensor in these environments can result in false alarms or missed CO events. Call PK Safety at 800.829.9580 for application guidance.

What is the detection range and response time of the CO-04 monitor?

The CO-04 detects carbon monoxide from 0 to 2,000 ppm in 1 ppm increments, with a T90 response time of 30 seconds via diffusion sampling. Accuracy is ±5% of reading below 300 ppm and ±20% above 300 ppm. Continuous operating life on alkaline batteries exceeds 6,200 hours — more than 8 months of uninterrupted monitoring.

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