Weather Protection is not a cheap optional to radars, so I´m always wondering why / when using it (besides the critical cases). Should we use just when radar is outdoors exposed just to sun/rain?
Do you select Weather Protection when specifying a radar? When do you use Weather Protection and why?
What I have seen is that most of the customers provide the protection themselves when the instruments (in general) are going to be outdoors. But if unsure I would better include it, since the device requires to be protected from direct sunlight. I would think that for radars, at least for compact mounted, considering they will be installed on top of the tanks (and maybe really tall ones), customer might not make the accommodations to protect it himself, as it wouldn't be as easy as covering a PT that is at eye level.
Indoors... mm... in general I have only seen devices with protective caps or even completely covered when having a harsh environment around them, say a pulp mill, or with chances of chemicals or dirties to fall over the transmitter's housing
Pulling this from Ametek O'Brien website...they specialize in this type of stuff as a third party provider...
"protects instrument electronic from radiant solar temperature gain as well as providing limited protection from blowing dust and rain"
It's the same on our radar. You don't want the electronics to exceed their ambient temperature rating. Generally, that's about 180 °F.
I honestly don't see the need for it very often. The instruments have an IP rating and/or NEMA rating which allows them to be used in all types of weather...the additional weather protection seems redundant to me.
I think it's used because it's in a spec and that spec hasn't been updated for years!
You can order it with the radar model code when getting a radar or you can also get it as a spare part:
Citing LR01's handbook Pre-installation requirements section: "Protect the signal converter from direct sunlight. If necessary, install the weather protection accessory."
IP/NEMA rating protects against particles, enclosed hazards, and water.. but not solar radiation.
I have seen instruments with sunshades almost everywhere: sugar mills, power plants, even at crude oil stations. And we had an issue once with a skid installed in a really hot weather, where the PTs triggered the alarms every noon, when the sun was at its most. I think this would lead to a different discussion: Why the sun has a negative effect on the instrumentation?