ENVITEC Medical Oxygen Sensor OOM202 Medical O2 sensor with 3 months warranty

Product Description

ENVITEC Medical Oxygen Sensor OOM202 Medical O2 sensor with 3 months warranty

Here is a detailed introduction to the ENVITEC Medical Oxygen Sensor OOM202 , a critical component in respiratory and anesthesia devices.

Overview: A Precision Electrochemical Cell

The ENVITEC OOM202 is a paramagnetic differential oxygen (O₂) sensor , a type of "magnetic dumb-bell" or "paramagnetic" sensor, designed for medical gas monitoring . It is not a galvanic fuel cell or a zirconia sensor, which are other common oxygen sensing technologies.

Its primary role is to provide high-accuracy, fast-response oxygen concentration measurements in patient breathing circuits, ventilators, anesthesia machines, and gas mixers.

Key Features & Technology

1. Core Operating Principle: Paramagnetism

Physical Property: Oxygen (O₂) is strongly paramagnetic —meaning it is attracted into a magnetic field. Most other common medical gases (N₂, CO₂, N₂O, anesthetic vapors) are slightly diamagnetic (repelled by a magnetic field).

The "Dumb-Bell" Design: The sensor contains a small, suspended quartz dumb-bell filled with a diamagnetic gas (like nitrogen), positioned in a non-uniform magnetic field.

How it Works:

1. When an oxygen-containing gas mixture flows into the sample chamber, the paramagnetic oxygen molecules are drawn into the magnetic field.

2. This creates a force that displaces (rotates) the diamagnetic dumb-bell.

3. The degree of rotation is directly proportional to the partial pressure of oxygen in the sample gas.

4. A precision optical or capacitive system measures this rotation and converts it into an electrical signal (0-5V or digital) corresponding to the O₂ percentage.

2. Key Specifications (Typical)

Measurement Range: 0-100% O₂ (often linear across the entire range)

Accuracy: Typically ±1% of reading or better in the medical range (21-100% O₂), which is excellent for clinical use.

Response Time (T90): Very fast, usually < 200 ms , allowing breath-by-breath monitoring.

Output Signal: Analog voltage (e.g., 0-5V for 0-100% O₂) or digital (via integrated electronics).

Sample Flow Rate: Requires a small, constant sample flow, typically 50-200 ml/min . Many devices use a built-in sampling pump.

Lifespan: Unlike electrochemical fuel cells that deplete, the OOM202 has no consumable elements . Its lifespan is determined by mechanical wear, seal integrity, and electronic stability—often 5+ years with proper calibration.

Typical Applications in Medical Devices

The OOM202 is integrated into the gas monitoring modules of high-end equipment:

Critical Care Ventilators: (e.g., older Dräger Evita, Hamilton, Maquet devices) For monitoring FiO₂ (inspired oxygen fraction).

Anesthesia Workstations: (e.g., Datex-Ohmeda, Dräger) For measuring O₂ concentration in the fresh gas flow and breathing circuit.

Patient Monitoring Systems: As part of a multi-gas analyzer module (e.g., combined with CO₂, N₂O, and agent sensors).

Oxygen Concentrator & Blender Verification: For calibration and quality control.

Critical Usage & Maintenance Points

1. Calibration is Crucial: Requires regular 2-point calibration :

Zero Point: Typically uses 100% Nitrogen (0% O₂). Never use a gas containing CO₂ for zeroing , as CO₂ is diamagnetic and will cause a false zero reading.

Span Point: Uses a known oxygen calibration gas (e.g., 100% O₂ or a medical air/oxygen mix like 21% or 95%).

2. Sample System Integrity:

Must be used with a water trap, particulate filter, and flow regulator .

Sample lines must be clean, dry, and leak-free .