Paramagnetic Oxygen Analyzer (Dumbbell Paramagnetic O₂ Analyzer)
The paramagnetic oxygen analyzer adopts a dumbbell-type paramagnetic sensor. Based on the strong paramagnetic property of oxygen, when the sample gas enters a non-uniform magnetic field, oxygen molecules are attracted toward the magnetic field center and generate a torque, causing the suspended dumbbell to rotate. A mirror mounted on the rotation axis reflects a light beam to a photodetector, and the signal processing module converts this into an oxygen concentration reading.
Key Features
- Paramagnetic sensor with high selectivity for oxygen
- Dumbbell-type magnetic force measurement mechanism for stable and traceable results
- Temperature-controlled measurement cell for improved stability
- Up to three selectable measurement ranges
- Optional corrosion-resistant paramagnetic cell and combustible gas protection
- Supports manual, automatic, and remote range switching
CONTHOS 3 PMD Series Models
| Model | Enclosure Type | Dimensions (H × W × D) | Weight |
|---|---|---|---|
| CONTHOS 3E PMD | 19" rack-mounted | 133 × 483 × 427 mm | Approx. 10 kg |
| CONTHOS 3F PMD | Wall-mounted field unit, purgeable steel enclosure | 434 × 460 × 266 mm | Approx. 25 kg |
Power supply: 100–240 VAC (standard)
Sample gas connection: Swagelok® 6 mm (optional 1/4")
Technical Data
- Measurement principle: Paramagnetic dumbbell sensor
- Minimum range: 0–1% O₂
- Maximum range: 0–100% O₂
- Range switching: Manual / Automatic / Remote (optional)
- Response time (T90): < 5 seconds (depending on flow and settings)
- Flow influence: 30–60 L/h variation ±10 L/h ⇒ < 1% span
- Detection limit: < 1% of full scale
- Repeatability: < 1% of full scale
- Linearity: < 1% of full scale
- Drift: Zero < 2%/week; Span < 1%/week
- Ambient influence: < 1% of full scale per 10 K
- Pressure compensation: Optional (800–1200 mbar)
- Interference correction: Static / dynamic correction supported (external selective signal source required)