Oxygen Deficiency
Detection

IAQ Detectors, the instrumentation brand of Ace Instruments, manufactures a CE certified oxygen deficiency detector for confined spaces, inert-gas fire suppression rooms, cold storage, and laboratory gas-purge areas. The instrument continuously measures ambient oxygen concentration via an electrochemical cell and outputs via Modbus RS-485 and relay for alarm integration.

Normal atmospheric oxygen concentration is 20.9%. OSHA 29 CFR 1910.146 defines oxygen deficiency as any concentration below 19.5%, the threshold at which continuous monitoring becomes a confined-space entry requirement.

Electrochemical O2 detectionModbus RS-485Relay outputCE certified1 instrument
View the oxygen detector →Talk to an application engineer

O2 level reference: % by volume

6%16%19.5%20.9%
Fatal within minutes<6%
Rapid fatigue12–14%
OSHA deficiency threshold19.5%
Normal atmospheric20.9%
1 instrument shown
Wall mountOxygen Deficiency Detector wall-mounted electrochemical O2 monitor

Oxygen Deficiency Detector

O2
RS-485Relay0-25% vol
Confined spaces · Gas storageView instrument →

Common applications

Where continuous oxygen monitoring is required

🚪

Confined spaces

Tank entry, vaults, and enclosed process areas require continuous oxygen monitoring under OSHA 29 CFR 1910.146 permit-required confined-space rules.

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Inert-gas fire suppression rooms

Server rooms and archives protected by inert-gas suppression systems monitor oxygen levels to warn occupants of gas discharge.

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Laboratories

Nitrogen-purged and cryogenic storage laboratories monitor ambient oxygen as a standard safety measure.

🧊

Cold storage

Controlled-atmosphere cold storage rooms with modified gas composition monitor oxygen for worker entry safety.

🏥

Hospitals & labs

Medical gas stores and cryogenic storage rooms are monitored for oxygen deficiency per NABH facility safety guidance.

Expert guidance

Not sure which oxygen detector configuration fits your space?

Our application engineers will confirm mounting location, alarm setpoints, and integration requirements for confined-space or inert-gas applications. Most enquiries answered within 24 hours.

Talk to an expert →sales@iaqdetectors.com

+91 8121025651 · Hyderabad, India