Strange behaviour of Viking 02035, 02038, TS3320

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garethhowell
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Joined: Tuesday 17 November 2015 22:19
Target OS: Raspberry Pi
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Strange behaviour of Viking 02035, 02038, TS3320

Post by garethhowell » Wednesday 14 March 2018 11:21

I have a number of these sensors around the house. Recently, a couple of them have started playing up. I've tried changing batteries but it makes no difference.

Sensor one returns more or less random temperatures. Changing the adjustment in the device has no effect. I'm treating that one as failed.

Sensor two is more interesting as it flips between returning true temps and wildly pessimistic temps in the -80s. I've attached a screenshot showing the past day and month
Screenshot 2018-03-14 08.56.06.png
Screenshot
Screenshot 2018-03-14 08.56.06.png (232.31 KiB) Viewed 1056 times
Any idea what might be going on, or is it just another duff device?

Gareth

Jem101
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Re: Strange behaviour of Viking 02035, 02038, TS3320

Post by Jem101 » Saturday 17 March 2018 18:28

The're not a little, squat white thing looking a bit like a flattened egg are they? I have two of them, not much in the way of a identification other than Model : XT200 on the back.

I got them both some years ago, cheap from some no-name supplier on eBay, cost about £3 each. In Domoticz they show up as Viking 02811/02813, Proove TSS330. Anyway they have never worked and like you say just give wildly fluctuating reading (right now it's apparently 126.5 degrees C in my living room whereas ten minutes ago it was -196).

If you leave them alone for a couple of hours, they stop reporting anything, take out and replace the batteries, and they reappear as a new device and so on.

They were so cheap that I can't be bothered to investigate much but whenever there is a firmware upgrade for the RFXCom which mentions Viking, I dig them out just to see.

So far, no luck, so back into the bits and pieces box they go....
I firmly believe in having an open mind - although not so open that your brain falls out!

- sometimes attributed to Carl Sagan, but the original quote is much older than that

garethhowell
Posts: 136
Joined: Tuesday 17 November 2015 22:19
Target OS: Raspberry Pi
Domoticz version: 3.9317
Location: St Neots, UK
Contact:

Re: Strange behaviour of Viking 02035, 02038, TS3320

Post by garethhowell » Friday 23 March 2018 9:48

Jem101 wrote:The're not a little, squat white thing looking a bit like a flattened egg are they? I have two of them, not much in the way of a identification other than Model : XT200 on the back.
No, these are like small bricks on their ends: 5 x 2 x 1cm
So far, no luck, so back into the bits and pieces box they go....
I’m coming to the same conclusion. The odd thing is that they were fine for a couple of years. Some of them still are OK.

garethhowell
Posts: 136
Joined: Tuesday 17 November 2015 22:19
Target OS: Raspberry Pi
Domoticz version: 3.9317
Location: St Neots, UK
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Re: Strange behaviour of Viking 02035, 02038, TS3320

Post by garethhowell » Friday 07 September 2018 11:27

Just an update on this because I've noticed something else odd with these.

I left them connected, but don't use them anymore. They have settled down and have stopped the wild fluctuations. However, I realised just now that their readings are inverted. Thus, one of them says the temp is currently -94C and is dropping. Looking at the curve, it's the inverse of what one would expect: high in the night (-90) and dropping during the day. Very odd.

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