SO-220 Apogee Fast Response Thermocouple Reference Oxygen Sensor


Apogee Instruments


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475,00 €

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The Sensor measures: O2 + Temperature
Cable Length: 5 meters
Power Supply: 12Vdc heat/2.5Vdc thermistor
Sensor for use in: Outdoor

The SO-220 has a fast response time of 14 seconds, is designed for use in soil applications, and has high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. It comes with a thermocouple wire to correct for temperature changes and a restive heater to raise the temperature of the membrane approximately two degrees above ambient temperature to keep condensation from occurring on the Teflon membrane and blocking the diffusion path of the sensor. Typical applications include measurement of O2 in laboratory experiments, monitoring gaseous O2 in indoor environments for climate control, monitoring of O2 levels in compost piles and mine sailings, monitoring redox potential in soils, and determination of respiration rates through measurement of O2 consumption in sealed chambers or measurement of O2 gradients in soil/porous media.


Accessories for Oxigen Sensor SO-110, SO-120, SO-210, SO-220.

Shown with optional diffusion and flow-through heads (sold separately).

Measurement Range
0 to 100 % O₂

Sensitivity (at sea level, 101.3 kPa)
12-13 mV in 21 % O₂, 0.6 mV per % O₂, 6 µV per 0.01 % O₂

Response Time (time required to read 90 % of saturated response)
14 seconds

Output at 0 % O2
2 % of output at 20.95 % O₂ or 0.2 ± 0.1 mV

Measurement Repeatability
Less than 0.1 % of mV output at 20.95 % O₂

Less than 1 %

Signal Decrease per Year
 6.3 % per year (0.8 mV per year)

Oxygen Consumption Rate
0.1 µmol O₂ per day at 20.95 % O₂ and 23 C

Operating Environment
 -20 to 60 C, 0 to 100 % relative humidity (non-condensing), 60 to 140 kPa

Input Voltage Requirement
12 V DC continuous (for heater), 2.5 V DC excitation (for thermistor

Heater Current Drain
6.2 mA (74 mW power requirement when powered with 12 V DC source)
Thermistor Current Drain
0.1 mA DC at 70 C (maximum, assuming input excitation of 2.5 V DC)

 32 mm diameter, 68 mm length

Mass 175 g (with 5 m of lead wire)

5 m of six conductor, shielded, twisted-pair wire

4 years against defects in materials and workmanship

Made in the USA

USEA Amplifier with x100 Gain for a volts output to Loggers.

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