pyroscience FireStingO2-Mini-ST, Руководство пользователя

Страница: 10 / 22

7
for automatic pressure compensation (useful for the following
oxygen units: %air sat, %O2, µmol/L, mg/L).
3.3 External Temperature Sensor
The oxygen measurement is generally temperature dependent.
Therefore,
the FireStingO2-Mini-ST provides a built-in
temperature compensation, which should be activated if the
temperature changes during measurements more than ca. 1ºC.
Although under certain circumstances the internal temperature
sensor can be also utilized for such a compensation, the first choice
should be always an external 4-wire PT10o temperature sensor
placed directly within the sample where the oxygen concentration
is measured. The
FireStingO2-Mini-ST provides a high-precision
sensor interface which can be directly connected to any standard
4-wire PT100.
Fig. 2 Connecting a 4-wire PT100 temperature sensor to the OEM module
The PT100 has to be soldered directly to the electronics board
within the module. In order to access the solder pads, the front cap
of the housing has to be removed by unscrewing the two screws
besides the optical port. Please refer to Fig. 2 how to connect the