Appendix C: Dewpoint Information - Oxford Instruments ANDOR Newton CCD Hardware Manual

Newton

APPENDIX C: DEWPOINT INFORMATION

To avoid issues with condensation, the coolant temperature must be set above the dewpoint- the temperature at which
condensation (dew) will form. In the relatively dry conditions of an air conditioned lab, or a cool dry climate, use of a
coolant temperature of 10
however, the dewpoint temperature will also increase so that the minimum coolant temperature that can be used will
have to increase accordingly. This will therefore limit the maximum cooling performance that can be achieved.
The first signs that condensation is forming will be on the coolant connections entering and exiting the camera. Use of
coolant at or below the dewpoint can result in permanent damage to the camera head due to formation of condensation
on internal components. It is therefore very important to ensure that coolant temperature is above the dewpoint. Further
guidelines are provided in Section 8.1. The relationship between Relative Humidity and Dew Point at varying Ambient
Temperature is shown below. There is a dewpoint calculator in Solis, and also a range of dewpoint calculators on-line
that you can enter ambient temperature and relative humidity to calculate the dewpoint for your conditions.
100
90
80
70
60
50
40
30
20
0
Version 1.4 rev 13 Oct 2017
C should not cause any problems. As relative humidity or ambient temperature increase
°
5 10
Ambient Temperature
20°C 22°C
15 20
Dew Point (°C)
24°C 26°C 28°C 30°C
68% humidity at 30°C
ambient temperature:
dewpoint is ~23°C
25 30
41