Limiting Current Type Zirconia Oxygen Sensor - SO-E2-960

• TO8 Housing
• Measuring gas: Oxygen concentration
• Measuring medium: Gaseous atmosphere
• Measuring principle: Limiting current type sensor
• Measuring ranges: 1.00 - 96.0 vol.% O2​
• Output current: 15 μA - 30 μA
• Accuracy: ±1.00 % O2
• Reproducibility: < 0.2 % O2

  • Model Number: SO-E2-960
  • Data Sheet: Date Sheet File
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  • Limiting Current Type Zirconia Oxygen Sensor
  • Limiting Current Type Zirconia Oxygen Sensor
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Product Specification

SO-E2-960 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-E2-960 TO8 Housing, ø 15.3 mm; H= 13.7 mm; pin distance 7.18 mm

Below the advantages of the Zirconia Oxygen Sensor SO-E2-960:
• Measuring range 1.00 to 96.0 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-E2-960 Limiting Current Type Zirconia Oxygen Sensors Applications:
  • Oxygen Concentrators
  • Incubators
  • Inert gas processing cabinets (Glove boxes)
  • Incubators (controlled bacterial growth)
Food industry
  • Packaging
  • Controlled food testing
  • Monitoring fruit ripening processes (storage / transport)
  • 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-E2-960 Limiting Current TypeZirconia Oxygen Sensors Characteristic Data:

Measuring gas
Oxygen concentration
Measuring medium
Gaseous atmosphere
Measuring principle
Limiting current type sensor
Measuring ranges
1.00 - 96.0 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).

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