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Oxygen Sensor Temperature Compensation
In-house Temperature Calibration ServicesIf your sample cannot be maintained at a constant temperature (+/-3 °C), you can perform a temperature calibration using the calibration function in the OOISensors Software, or we can perform the calibration for you. The -CAL is an in-house factory-calibration service for environments from 0 °C to 80 °C. The -CAL-EXT is a factory-calibration service for extended temperature ranges below 0 °C or above 80 °C. You'll need to determine the temperature and the oxygen concentration range of your sample before ordering an in-house calibration service.
Oxygen Sensor RTDs
Themistors & ThermocouplesThermistorsA thermistor, a type of temperature-to-resistance transducer, is able to
transduce temperature into a continuous electrical signal. A circuit measures
the resistance of the thermistor and provides an output voltage proportional to
the temperature. The TS1 Thermistor from Omega (model number ON-403-PP) is
a stainless-steel tubular electrode probe most often used for liquid immersion.
The TS1 can monitor temperatures from 0° C to 100° C. It connects to the
T-MOD-1, an RS-232 module that interfaces the thermistor to your PC, and
that can be installed into a desktop box or industrial rack mount. ThermocouplesA thermocouple consists of two dissimilar metals bonded to each other, typically by welding. The bimetallic junction develops a small voltage that varies with temperature. A thermocouple also provides accurate and consistent measurements and operates over a wide temperature range. The TK1 Thermocouple from Omega (at right, model number KMQSS-125-6) is an electrode that can monitor temperatures from -150° C to 220° C. The thermocouple must be connected to the T-MOD-K, which is an RS-232 module that interfaces the thermocouple to your PC. The T-MOD-K can support up to 4 thermocouples, and can be installed into a desktop box or industrial rack mount. The software can then apply algorithms to the readings to correct for temperature fluctuations. The TK1-W Thermocouple from Omega is a wire-type electrode that can monitor temperatures from -150° C to 220° C. It is smaller and more flexible than the TS1 Thermistor. The TK1-W thermocouple must be connected to the T-MOD-K, which is an RS-232 module that interfaces the thermocouple to your PC. The T-MOD-K can support up to 4 thermocouples, and can be installed into a desktop box or industrial rack mount. The software can then apply algorithms to the readings to correct for temperature fluctuations.
OOISensors Software and Temperature Fluctuations OOISensors Software corrects for changes in data due to temperature fluctuations. Though Ocean Optics miniature spectrometers are extremely sensitive, temperature fluctuations +/-3° C cannot be detected by the spectrometer.
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Our
Oxygen Sensors with FOXY, FOSPOR and HIOXY Sensing Formulations are affected by
temperature. Temperature affects the fluorescence decay time, fluorescence
intensity, collisional frequency of the oxygen molecules with the fluorophore,
and the diffusion coefficient of oxygen. Temperature also affects the
solubility of oxygen in samples. The net effect: a change
in the calibration slope. Because of this, the sample must be maintained at a
constant temperature (± 3 °C) for best results. If this is impractical,
the sensor can be calibrated by measuring temperature and oxygen
concurrently using one of our temperature-compensation accessories and
in-house calibration services:
We offer three RTDs to adjust for
temperature changes. The USB-LS-450-TP
(at right) is a 1/8" OD, 100 ohm platinum RTD that connects to the 
