1600 pro desiccant replacement - when?

[AbsolutelyN]

Just a quick and probably really basic query regarding the desiccant in the zwo 1600pro - how do you know when to change it? 

I had my rig running last night and it fogged over about 1am. Something went wrong with SGP and it continued running the camera until 5:30am at -20c rather than warming it up and ending. I'm guessing running the camera in thick fog is not ideal.  

[Adam J]

Generally you will know it needs replacing when you get ice forming on the sensor. This tends to produce a dark patch in the centre of the sensor amongst other effects.

Apart from that if it not broken then don't fix it. 

I have had mine about 18 months and have not had to do anything with it so far. 

Adam

[AbsolutelyN]

Brilliant, thanks Adam, much appreciated.