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Limiting Current Type Zirconia Oxygen Sensor - SO-A0-250

? TO39 Housing
? Measuring gas: Oxygen concentration
? Measuring medium: Gaseous atmosphere
? Measuring principle: Limiting current type sensor
? Measuring ranges: 0.10 - 25.0 vol.% O2
? Output current: 100 μA - 200 μA
? Accuracy: ±0.25 % O2
? Reproducibility: < 0.1 % O2

Model Number: SO-A0-250
Data Sheet:

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Product Specification

SO-A0-250 Limiting Current Type Zirconia Oxygen Sensor Operational Principle
When voltage is applied to a zirconia electrolyte cell, oxygen is pumped through the zirconia disc from the cathode side to the anode side because the carriers of the current flowing through the zirconia electrolyte are oxygen ions. By attaching a cap with a pinhole on the cathode side of the cell and by increasing the voltage over the cell the current shows saturation due to the rate limiting step in the transfer of oxygen to the cathode. This saturation current is called limiting current and is nearly proportional to the ambient oxygen concentration.

SO-A0-250 TO39 Housing, ? 9.2 mm; H= 6.4 mm; pin distance 3.59 mm.

Below the advantages of the Zirconia Oxygen Sensor SO-A0-250:
? Measuring range 0.10 to 25.0 vol.% oxygen
? High accuracy
? For many types a more or less linear characteristic
? Small temperature dependence of the sensor signal
? Low interference with other gases
? Long service life
? In many cases "Single point calibration" necessary only once

SO-A0-250 Limiting Current Type Zirconia Oxygen Sensor Applications:
Medical
? Oxygen Concentrators
? Incubators
Laboratory
? Inert gas processing cabinets (Glove boxes)
? Incubators (controlled bacterial growth)
Food industry
? Packaging
? Controlled food testing
? Monitoring fruit ripening processes (storage / transport)
Household/Gastronomy
? High-temperature humidity measurements (> 100°C) for baking / roast automation
Measuring technique
? Oxygen Meters (stationary / portable)
? Measurements under controlled O2 content
? Air conditioning and ventilation
Security technology/Monitoring
? Fire protection (increased N2 atmosphere e.g. Server rooms)
? Greenhouses, wine cellar
? Gas storage, refineries
? Diving
? Fermentation units
(Electrical-) industry
? Inert gas processing machines and cabinets
? Inert gas welding monitoring
? Storage with increased N2 atmosphere (oxidation prevention)
? Drying units
? Nitrogen concentrators
? Exhaust gas measurement

SO-A0-250 Limiting Current Type Zirconia Oxygen Sensor Characteristic Data:

Measuring gas	Oxygen concentration
Measuring medium	Gaseous atmosphere
Measuring principle	Limiting current type sensor
Measuring ranges	0.10 - 25.0 vol.% O2
Response time (t90)	2 to 25 sec. (Depends on: sensor type, gas flow, measuring chamber)
Sensor voltage / heating voltage / power consumption / heater cold resistance
Sensor voltage: Heating voltage: Power consumption: Cold resistance:	0.7 to 1.6 Volt 3.6 to 4.4 Volts 1.3 to 1.8 Watts (depends on application and packaging) R(25°C) = 3.25Ω ± 0.20Ω
Warm up time	Min. 30 s
Maximum permissible operating temperature	350°C () Depending on the cable and filter assembly (see paragraph: specification, Cable assembly)
Permissible volumetric flow rate (Purging the sensor)	For all sensor types, the maximum flow rate depends on the way of purging the sensor (sensor in direct gas flow, gas beam shape, etc.) and the size of the measuring chamber. Exception: SO-E1-xxx (TO8 + hose connection for direct gassing). Permissible flow [ml/min]: 100 - 500 (optimal: 250)
Lifetime (MTTF)	~ 20.000 hours () Depending on measuring medium. Stated lifetime refers to a heated, operated sensor of type SO-xx-250 and SO-xx-960. A failure or reaching the lifetime typically means a slight deviation from the dispatch specifications.
Vibration resistance	Sensors based on the TO8 socket as well as those built with a TO39 socket (SO-Bx-xxx, SO-Ex-xxx, SO-Ax-xxx) meet the European Norm EN60068-2-6 (Sinusoidal vibration tests).