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6 General Operation
Sensors
ties. Thus, it is recommended that the sensor be located where there is minimal
air currents.
The self-heating of the sensor could also be altered by nearby objects that insu-
late the sensor from the air. Keep adequate air space around the sensor.
The self-heating of the sensor takes a few minutes to stabilize after the power to
the thermo-hygrometer is switched on or the sensor is attached. For best results,
allow 15 minutes for the sensor to settle after applying power.
The sensor takes some time to respond to large changes in temperature or hu-
midity, such as, for instance, when the sensor is brought from a cold or humid
location to a warm or dry one. Depending on the difference, the sensor can take
several minutes to more than an hour to reach full accuracy after conditions
have changed.
Finally, moisture condensing within the sensor can cause erroneous or invalid
measurements. Condensation can occur if the sensor is brought from a warm,
high-humidity environment to a colder temperature. This can be avoided by
first moving the sensor into low-humidity air at the same temperature for about
30 minutes before it is placed at the lower temperature. If condensation does
occur, the sensor should recover once it dries out. This may take several hours.
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