New guy here- I noticed the low temp on this model is -40, but I know we can see -50/-60 in Alaska winters
Do I pull my unit or does it shut down?
Thanks
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Latest Cumulus MX V4 release 4.4.2 (build 4085) - 12 March 2025
Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
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Ambient WS-2090 in below -40 weather
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PaulMy
- Posts: 4355
- Joined: Sun 28 Sep 2008 11:54 pm
- Weather Station: Davis VP2 Plus 24-Hour FARS
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Re: Ambient WS-2090 in below -40 weather
Many/most (but not all) pws have a -40 reading limit. Normally you would not need to do anything other than to know that it might have been colder that day. Check the yearly temperature here http://www.wunderground.com/weatherstat ... =INUNAVUT2 and it bottoms out at just past -40 and that station is outside all year in much colder weather.
Paul
Paul
VP2+
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KarlS
- Posts: 140
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Re: Ambient WS-2090 in below -40 weather
The reason for the -40deg limit is they way the station transmits the data from the outside temperature sensor to the base station. The temperature information ist stored as a 12bit value in the datastream. You get the actual temperature by subtracting 400 and deviding by 10.
Example: if the transmitted valie is 689, you first subtract 400 giving 289 and devide by 10 resulting in a temperatue of 28.9deg
Example 2: if the transmitted value is 000, you subtract 400 giving -400 and divide by 10 giving -40.0deg. This explains why the weather station "maxes" out at -40deg.
If you are interested, there are other threads on this forum explaining the Fine Offset data structure.
Example: if the transmitted valie is 689, you first subtract 400 giving 289 and devide by 10 resulting in a temperatue of 28.9deg
Example 2: if the transmitted value is 000, you subtract 400 giving -400 and divide by 10 giving -40.0deg. This explains why the weather station "maxes" out at -40deg.
If you are interested, there are other threads on this forum explaining the Fine Offset data structure.