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To avoid damage of telescope and instruments it is strictly forbidden to open the dome under high humidity conditions or danger of rain fall. Observations have to be stopped immediately, if a warning message from the rain detector is displayed or the limiting humidity in the Cassegrain focus is reached. Do not reopen the dome before the humidity at the cassegrain focus and the humidity outside the dome has fallen by at least 5% . Humidity values are displayed by the envi(ronment) panel (Fig. 17) in the telescope section.

		Humidity limit at Cass. focus 		 $<$90% 

Dieter Engels