P8863
Paramagnetic (Dumbbell) Oxygen Analyser
Robust analyser for safe and hazardous areas, suitable for Oxygen enriched samples.
Paramagnetic P8863 Oxygen analyzer allows the selective analysis of the O2 concentration in process gases taking advantage of its evident paramagnetic property that makes it attracted by a magnetic field.
The specific features of the measuring principle makes the analyser virtually free from cross sensitivity by other gases, allowing its use in a variety of applications that range from purity measurement to O2 analysis in complex stream gases containing Hydrogen, Hydrocarbons and many others.
Measureable Gas
Oxygen [O2]
Main Features
High Performances
- Free from cross sensitivity by other gases in the sample
- Sensing unit temperature controlled
- Insensitive to ambient temperature variations
- Available as 4-20 mA transmitter or combined with a powerful microprocessor-based control unit
Easy Maintenance
- Modular construction
- Fast access to the inner PCB just unscrewing the housing cap
- Possibility to remove the entire sensing unit from the housing just by unscrewing 2 screws and leaving her housing connected to the sampling system.
European Compliance
- Low Voltage Directive 2014/35/EU
- EMC Directive 2014/30/EU
- Directive ATEX 2014/34/EU (optional)
ATEX
ATEX certification for Zone 1 / Zone 21 with protection mode:
II 2 G D Ex db IIC T6 Gb
Ex tb IIIC T85°C Db
IP65
ATEX Certificate Number CESI 03 ATEX 130
Specification
| Performance | |
|---|---|
| Accuracy | General accuracy: ± 1% of span (output signal). |
| Repeatability | ± 0.3% of span (short term). |
| Reproducibility | 24 hours: ± 1% of span. |
| Linearity | Better than ± 1% of full scale |
| Response Time | Initial: < 1 sec.; 90% of step-change: < 3 sec. |
| (with max. 1000 cc/min. flow rate) | |
| Drift | Zero: max. ± 1% of span per week |
| Span: max ± 1% of span per week (without autocalibration) | |
| Ambient Temp. Influence | ± 0.002% O2 per °C or ± 0.02% of span per °C |
| (-10°C ÷ +50°C) | (whichever is greater) |
| Atm. Pressure Influence | ± 0.1 % of reading per hPa |
| Flow Rate Influence | < 0.5% of span over flow range of 100 to 1000 cc/min. |
| Line Voltage Influence | max. 0.02% of span, for each 1% change of voltage. |
| Operative | |
| Sample Requirements | Flow Rate: 250 ÷ 1000 cc/min. |
| Pressure: 3000 Pa minimum (with filter and flow meter). | |
| Range | Refer to ordering information |
| Output | 4-20 mA proportional to ordered range on max. load of 250 Ω (or 125 Ω is galvanically insulation module is used) |
| Relative Humidity | 90% maximum. |
| Operation Temperature | -10 ÷ +50°C (14 to 122 °F). |
| Temperature controlled | at 50°C |
| Storage Temperature | +70°C (158 °F) max. |
| Power Requirements | 24 Vac ± 10%, 50 VA from dedicated power supplier. |
| Pneumatic Connections | ¼” or 6 mm OD tubing (compression fittings supplied) |
| Wiring Connections | General purpose: 2 openings for G 3/8" (PG 13 cable grip). |
| Ex-Proof: 2 openings for GK 1/2" (cable grip or conduit). |
Applications
Oxygen purity measurements
Air separation plants
Oxygen measurements in Hydrogen stream
Inerting Control
Power Plants
Biogas & Landfill Gas
Steel & Metal Processing
Combustion gas
Sampling System
Due to the presence of delicate and optical parts inside the dumbbell cell, the P8863 needs an external sampling system able to deliver a perfectly clean and dry sample gas to the analyser at the proper temperature, pressure and flow rate.
ADEV has a wide experience in process and can provide the P8863 analyser combined with a sample and condition system designed for the specific application requirements. Contact ADEV for details.
Measuring Principle
Paramagnetic P8863 Oxygen analyzer allows the selective analysis of the O2 concentration in process gases taking advantage of its evident paramagnetic property that makes it attracted by a magnetic field.
The Cell Block assembly is made of stainless steel and contains the cell cavity and pole pieces which produce two powerful magnetic fields in the cavity.
The magneto-dynamic cell consists of two nitrogen-filled quartz spheres arranged in the form of a dumb-bell. A single turn coil of platinum wire is placed around the dumb-bell which is suspended in a symmetrical non-uniform magnetic field. At its center, the dumb-bell bears a small mirror.
When the surrounding gas contains Oxygen the spheres are pushed out of the magnetic field caused by the relatively strong Para magnetism of Oxygen. The force on the dumb-bell is corrected by a current through the coil which is controlled by a photo-detection system via a light beam and the mirror on the dumb-bell.
The feedback current, required to compensate the torque acting on the dumb-bell will be proportional to the Oxygen concentration in the gas sample through the cell.