Rugged Oxygen analyzer for inerting control and heavy-duty applications. Selected materials and modular design makes this analyzer practically indestructible and the ideal solution for safety-critical industrial applications.

The weatherproof and explosion proof 8863 is designed for field installation in the most severe conditions, minimizing the sample conditioning requirements.


Measureable Gas

Oxygen [O2]

Main Features


Extreme Roughness

  • No inner moving parts
  • Wet parts in AISI316 (optional Hastelloy C276) and glass
  • Resistant to corrosion by acid and solvents

High Performances

  • Sensing unit temperature controlled
  • Insensitive to ambient temperature variations
  • Installation position and vibration don’t alter the accuracy and stability of the measure
  • 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 certification for Zone 1 / Zone 21 with protection mode:

II 2 G D     Ex db IIC T6 Gb

Ex tb IIIC T85°C Db




Accuracy ± 1% of span (output signal). Further improvable with autocalibration.
Repeatability ± 0.3% of span (short term).
Reproducibility 24 hours: ± 1% of span.
Linearity with control unit: better than ± 0.5% of full scale
Response Time Initial: < 1 sec.; 90% of step-change: 30 sec.
(with max. 2000 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 ± 0.07% of measure per °C
(-10°C ÷ +50°C) (whichever is greater)
Ambient Temp. Influence – 1% of measure per °C max.
(+50°C ÷ +55°C)
Atm. Pressure Influence ± 0.18 % of reading per hPa
Flow Rate Influence < 0.5% of span over flow range of 250 to 1000 cc/min.
Line Voltage Influence max. 0.02% of span, for each 1% change of power voltage.
Gas Interference < ± 0.01% O2 reading per 1% CO2
< ± 0.07% O2 reading per 1% H2
< ± 0.007% O2 reading per 1% H2O
< ± 0.01% O2 reading per 1% SO2
Sample Requirements Flow Rate: 250 ÷ 1000 cc/min.
Pressure: 3000 Pa minimum (with filter and flow meter).
Range Refer to ordering information
Output non-normalized output current that functions as input of the selected ADEV control unit
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 ÷ 30 Vdc, 45 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).



Inerting Control


Reactor Feed Gases

Chemical & Pharmaceutical

Power Plants & Nuclear

Sulfur Production

Biogas & Landfill Gas

Steel & Metal Processing

Solvent Recovery


Sampling System


The 8863 needs an external sampling system able to deliver an almost clean sample gas to the analyzer at the proper temperature, pressure and flow rate.

ADEV has a wide experience in process and can provide the 8863 analyzer combined with a sample and condition system designed for the specific application requirements. Contact us for details.

Measuring Principle


Thermoparamagnetic 8863 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. Associated with each field is a thermistor pair, consisting of a measuring thermistor and reference thermistor.

The measuring thermistor is mounted in the cavity within its respective magnetic zone; the corresponding reference thermistor is mounted in the cavity just outside its magnetic zone. A sample inlet port and a sample outlet port are arranged to permit a portion of the flowing sample to diffuse into the cavity, where it comes under the influence of thermal gradients and magnetic fields. The effect of the resulting thermo-magnetic action on the thermistors provides the measuring means.