SKU: RKI01-72-0018

RKI Instruments OX-04 Series O2 Single Gas Monitor 72-0018

$118.00

Ships next business day

Description

RKI Instruments OX-04 Series O2 Single Gas Monitor 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 O2
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

Specifications:

Gas Detected: Oxygen
Detection principle: Electrochemical
Detection range: 0 ~ 40%
Alarm set points: L: 19.5%, LL: 18.0%, H: 125.0%
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 10 seconds
Accuracy: <25% ±5% of reading or >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.
- Downloading cable, USB / IrDA adapter (not included) is needed to use Data Logging.
Continuous operation: 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 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:

04 Series User Setup Program Operator’s Manual:

04 Series Data Logger Management Program Operator’s Manual:

Part Number:
72-0018

Frequently Asked Questions

What oxygen levels trigger alarms on the RKI OX-04 monitor?

The OX-04 ships with three alarm setpoints: L alarm at 19.5% O2, LL alarm at 18.0% O2, and an H alarm at 23.5% O2 for oxygen-enriched atmospheres. OSHA 29 CFR 1910.146 defines an oxygen-deficient atmosphere as any space with less than 19.5% O2 by volume — requiring permit-required confined space protocols. All setpoints are user-adjustable to align with your site safety program.

How long do alkaline batteries last in the OX-04 Series O2 monitor?

The OX-04 operates approximately 3,000 hours on a set of two AAA alkaline batteries — over four months of continuous use. The continuous operating ceiling is rated at 4,600 hours. The low battery alarm activates before the instrument reaches an unsafe operating voltage, giving workers time to replace batteries without gaps in monitoring coverage.

What applications require continuous personal oxygen monitoring?

O2 monitoring is required wherever inert gas purging, liquid nitrogen use, cryogenic processes, or incomplete combustion can displace oxygen. Common applications include laboratories, confined space entry under 29 CFR 1910.146, cryogenic environments, industrial gas storage rooms, clean rooms, and underground utility vaults. See PK Safety’s portable gas monitors collection for multi-gas options that pair O2 detection with LEL, CO, and H2S.

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

PK Safety services RKI instruments in-house with factory-trained technicians, providing NIST-traceable oxygen calibration, sensor replacement, and data log retrieval for the OX-04 Series. The 04 Series warranty — 3 years including sensors — is supported through PK Safety’s service center. Call 800.829.9580 to schedule calibration or inquire about service pricing.

What intrinsic safety approval does the OX-04 Series carry?

The OX-04 is ATEX/IECEx approved and QPS classified C/US as intrinsically safe for Class I, Division 1, Groups A, B, C, D locations. Intrinsic safety certification confirms the monitor cannot produce sufficient electrical energy to ignite a flammable atmosphere, making it compliant for classified areas such as chemical plants, refineries, and petrochemical facilities. Always verify the certification label on your specific unit before deploying in classified zones.

How does the electrochemical sensor in the OX-04 detect oxygen?

Electrochemical oxygen sensors generate a small electrical current proportional to the partial pressure of oxygen diffusing through a membrane into an electrolyte solution. The sensor requires no external power to produce its signal, and the OX-04’s electrochemical cell is field-replaceable with no tools required, keeping maintenance straightforward. Response time is T90 in 10 seconds.