SO-120 Soil Response Thermocouple Reference Oxygen Sensor


Apogee Instruments


Call +34 916292106 or complete our form
 More info about this product

475,00 €

Add to wishlist

The Sensor measures: O₂
Cable Length: 5 meters
Power Supply: 12Vdc (heater), 2.5Vdc (thermistor)
Sensor for use in: Outdoor

Apogee oxygen sensors are designed to measure 0 – 100% oxygen and come with tinned leads to connect to a datalogger. The SO-120 is designed for use in soil applications with a larger signal, slower response and longer life. It comes with a thermocouple wire to correct for temperature changes. In applications with high humidity, condensation can occur on the Teflon membrane, blocking the diffusion path of the sensor. To prevent this, a resistive heater is included to raise the temperature of the membrane approximately two degrees above ambient temperature. Select a diffusion or flow-through head if needed depending on your application. The sensor is calibrated to ambient air making it very easy to calibrate. An aluminum housing that is filled with epoxy allows the sensor to withstand harsh conditions.


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: 2.6 and 0.6 mV per % O2 for SO-100 and SO-200 series, respectively
Output at 0 % O<sub>2</sub>: 6 % and 3 % of output at 20.95 % O2 for SO-100 and SO-200 series, respectively
Measurement Repeatability: < 0.1 % of mV output at 20.95 % O2
Non-linearity: < 1 %
Non-stability (Signal Decrease): 1 and 0.8 mV per year for SO-100 and SO-200 series, respectively
Oxygen Consumption Rate: 2.2 μmol O2 per day at 20.95 % O2 and 23 C
Response Time: 60 and 14 s for SO-100 and SO-200 series, respectively
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
Thermistor Current Drain: 0.1 mA DC at 70 C (maximum, assuming input excitation of 2.5 V DC)
Dimensions: 3.2 cm diameter, 6.8 cm length
Mass: 175 g (with 5 m of lead wire)
Cable: 5 m of six conductor, shielded, twisted-pair wire

USEA Amplifier with x100 Gain for volts output to Loggers.

30 other products in the same category: