Section ten effect of temperature – Teledyne TED 191 User Manual
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TELEDYNE ELECTRONIC TECHNOLOGIES
Analytical Instruments
S
ECTION
T
EN
E
FFECT OF
T
EMPERATURE
The Teledyne Electronic Technologies
Analytical Intruments
sensors adjust for ambient temperature
changes in the range of 0 - 40ºC (32 - 106ºF). Since the thermistor that compensates for these
changes is located in the rear of the sensor assembly, it is important that gas mixtures, flowing
over the front of the sensor, be at room temperature. Reading errors may occur if hot gases from a
heated humidifier are directed past a sensor teed into a breathing circuit.
A small thermal tracking error may be encountered in applications where the entire sensor
assembly is placed in the gas mixture to be analysed (e.g incubators). No adjustments should be
made during this period (about 1 to 2 hours), since this error will be eliminated when both the
thermistor and sensing electrode have had sufficient time to come to thermal equilibrium.