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58 Rev. G Nov/2015 MI3
9.1.1 Avoidance of Condensation
If environmental conditions makes water cooling necessary, it is strictly recommended to check
whether condensation will be a real problem or not. Water cooling also causes a cooling of the air in
the inner part of the sensor, thereby decreasing the capability of the air to hold water. The relative
humidity increases and can reach 100% very quickly. In case of a further cooling, the surplus water
vapor will condense out as water. The water will condense on the lenses and the electronics resulting
in possible damage to the sensor. Condensation can even happen on an IP65 sealed housing.
There is no warranty repair possible in case of condensation within the housing!
To avoid condensation, the temperature of the cooling media and the flow rate must be selected to
ensure a minimum device temperature. The minimum sensor temperature depends on the ambient
temperature and the relative humidity. Please consider the following table.
Ambient Temperature [°C/°F]
Tab. 5: Minimum device temperatures [°C/°F]
Temperatures higher than 60°C
(140°F) are not recommended due to
the temperature limitation of the
sensor.
Example:
Ambient temperature = 50 °C
Relative humidity = 40 %
Minimum device temperature = 30 °C
The use of lower temperatures is at your own risk!