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54 Rev. D7 Jul 2017 Marathon MM
8.3.1 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. 6: 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!