Hello All, I just purchased a new Perdix 2 a couple weeks ago. I have done 6 dives with it so far and the bottom temperatures are way off. I have several dives at 60 feet in freshwater rock query that the bottom temp is 56 degrees. Several of my dive buddies registered this temperature on their dive computers which are different brands. We were at that temp for about 10 min. Mine only registers 71 degrees. The surface temp water is about 88 and surface air 100-110 here in Texas. Any ideas why the bottom temps are not accurate but surface temps seem to be. Does it normally take more than 10 min for it to update the proper bottom temp?
Perdix 2 Temperature Inaccuracy
- Thread starter bengals97
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Do you have it in a sleeve or case? Is it near a heat source like a light?
Do a test at home with a bowl of cold water and a meat thermometer or the like.
Its starting off so hot (100+F) it's taking a longer time for the mass of metal and plastic to cool down.
I think this is normal; the temp sensor is known to be very slow to react for the reason @rjack321 states. If anything, I think the Perdix 2 is a little quicker than the Perdix 1, maybe due to the metal front. Here's a start of a dive where it goes from 27C/80F at the surface (hot day here! it must have been in the sun a bit) to 12C/53F at the bottom in about 15 minutes.
broncobowsher
Contributor
Well known for very slow response times.
Belzelbub
Contributor
The Perdix is big and mostly black. It retains heat for a while, so might take a bit longer to register the temp. Still, if you were in 56° water for 10 minutes, I’d expect it to come to the correct temp by then, or at least closer.
I have both a Perdix and a Garmin MK2s. I just took a look at my most recent dives with both. In each, the Perdix started the dive at 6-7° warmer than the Garmin. Perdix cooled down and stabilized by the 7 or 8 minute mark. But, the temp differences between air and water in my case was only about 10-15°, yours was more extreme. It’s starting a lot hotter, but also exposed to much cooler water, so maybe that’s a tossup.
The ice water with a reference thermometer would be a good test. It should read pretty close after about 10 minutes. If still reading high, you might try reaching out to SW.
Thank you I had not considered the home test. I do have it in a silicon sleeve to protect it. I can do a test with and without to see the difference.
drop it in some ice water, (with actual ice cubes in there). That's an easy to verify "known". You can also time how long it takes to get to 32F. Its a big block of plastic which takes awhile to equilibrate.
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