Original HONEYWELL OOM109 OOM109-LF2 （EnviteC） Oxygen Sensor
Product Overview
The Honeywell OOM109, manufactured by EnviteC, is a high-speed electrochemical galvanic oxygen cell. Optimized for real-time breath-by-breath monitoring, it is designed for cardiopulmonary exercise testers, anesthesia machines, ventilators and oxygen concentration analyzers, complying with the medical standard ISO 80601-2-55. Two mainstream versions are available: standard OOM109 and lead-free eco-friendly OOM109-LF2.
Operating Principle
It adopts a galvanic cell structure consisting of a noble metal cathode and a bismuth/lead anode (bismuth anode for LF2 lead-free variant) filled with electrolyte. Oxygen permeates through the gas-permeable membrane and undergoes reduction at the cathode, generating a weak voltage signal linearly proportional to oxygen partial pressure. An integrated NTC thermistor provides built-in temperature compensation, eliminating the need for additional temperature compensation circuits on the mainboard.
Core Electrical & Performance Specifications
Measurement Range & Output
- Measuring range: 0～100 vol% O₂ (at atmospheric pressure)
- Output signal in ambient air (21% O₂): 9～13 mV
- Recommended load resistance of backend circuit: ≥10 kΩ
- Zero offset (5-minute nitrogen purge): ＜50 μV
Response Speed (Core Advantage)
- T90 response time: ＜360 ms (0.36 s), the fastest within the product series, suitable for dynamic real-time breath sampling
Accuracy
- Repeatability: ＜1 vol% O₂ under constant temperature and pressure
- Relative linearity error: ＜3%
- Long-term drift: ＜1 vol% O₂ per month; total relative drift of approx. -15% over full service life
Environmental Compatibility
- Operating temperature: 0℃～45℃ (short-term peak 50℃)
- Compensation error: 3% at stable 25～40℃; maximum 8% across 0～50℃
- Humidity: 0～99% RH, non-condensing environment only
- Pressure range: 0.7～1.25 bar (600～2000 hPa); output varies linearly with oxygen partial pressure
- Storage temperature: -20℃～50℃; recommended storage at 5～15℃ away from light
- Humidity interference: -0.03% relative error per 1% RH at 25℃
Service Life
Nominal lifespan: ≥200,000 vol%·hours
Typical continuous service life for cardiopulmonary equipment: 8～12 months; service life shortened under high-oxygen working conditions
Mechanical Structure & Connector
- Electrical interface: 3-pin Molex 22-11-1031 connector
- Thread specification: M16×1 (compatible with 5/8-24 UNEF adapter)
- Outer diameter: Φ14.5 mm; overall length: 41.4 mm
- Weight: ~28 g
Model Differences
- OOM109: Standard lead anode, cost-effective, widely adopted for general medical equipment
- OOM109-LF2: LF = Lead-Free, featuring bismuth anode to meet RoHS medical regulations; ideal for EU export. Fully interchangeable with the standard model with identical performance parameters.
Typical Application Scenarios
- Cardiopulmonary exercise testing systems (standard sensor for Schiller, Lanyi and other brands)
- Anesthesia ventilators, neonatal incubator oxygen monitoring
- Metabolic gas analyzers for exercise, breath-by-breath oxygen concentration detection
- Oxygen concentration monitoring for medical oxygen concentrators
Operation & Calibration Guidelines
- Allow a 30-minute warm-up period after sensor replacement for stable signal output
- Standard calibration: two-point calibration using ambient air (21% O₂) and 100% pure oxygen
- Replace the sensor immediately if severe signal drift, excessive zero offset or calibration failure occurs, indicating depleted electrolyte
- Avoid long-term exposure of the membrane to condensed water or high-concentration anesthetic agents, which will accelerate sensor degradation
- HONEYWELL OOM109 （EnviteC） Oxygen Sensor
- HONEYWELL OOM109-LF2 （EnviteC） Oxygen Sensor
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