# Temperature readings delayed

**URL:** https://f.ruuvi.com/t/temperature-readings-delayed/4223
**Category:** 🇬🇧 RuuviTag & RuuviTag Pro sensors
**Created:** [16 June 2020 15:52 UTC](https://f.ruuvi.com/t/temperature-readings-delayed/4223 "2020-06-16T15:52:14Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![otso](https://f.ruuvi.com/user_avatar/f.ruuvi.com/otso/32/1651_2.png) [@otso](https://f.ruuvi.com/u/otso)
#### Post date: [16 June 2020 16:29 UTC](https://f.ruuvi.com/t/temperature-readings-delayed/4223/2 "2020-06-16T16:29:09Z")

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Hello Londo,

> [@londo](#):
>
> First the palju sensor; I placed it inside a ziploc bag for some extra moisture protection, though I suppose this doesn’t help much with condensation. Based on reading the forums I kept the tag in for just a few hours. I think this might not be the best solution - connecting an external waterproof temperature probe could work better. I have zero electronics/soldering experience though, so this might prove difficult. Furthermore, keeping the tag resistant to the elements (e.g. it would still be outside while not floating in water) while having a wire coming out of the case seems impossible. Any ideas?

RuuviTag is IP67-rated, which means that it can be submerged briefly. Longer term submersion would void the warranty, but some people have been taping over the breathing sticker and enclosure opening to make tag more waterproof. I would also add a bag of desiccant inside the enclosure. Please note that leaving RuuviTag in water for long periods of time is at your own risk.

As for wiring external sensor, it would require some coding and soldering. I have modified some RuuviTags to have external sensors taking a normal USB cable, cutting the connectors off and using the 4 wires to carry power + data. I drilled a hole into enclosure and sealed it off with hot glue. Soldering to the test pads on bottom of RuuviTag is doable, but I’d practice a little bit on some prototyping boards before working on the tag. Here is one example by @jari.isohanni : [Temperature measurement outside the tag - #3 by jari.isohanni](https://f.ruuvi.com/t/temperature-measurement-outside-the-tag/275/3)

> [@londo](#):
>
> And second: my primary goal - the sauna sensor - proved to be pretty much useless. The idea is to get an alert when the room reaches a specific temperature, but since the sensor is inside the case and the air inside doesn’t seem to conduct heat very well, there’s a significant delay in getting the sensor to match the actual room temperature. So much so that the sauna is about 30-40 degrees hotter than the reading, which isn’t great. Using the tag without the case would probably help, but I doubt the tag would last very long. Is this problem solvable?

Placement of tag in sauna is critical for the temperature, @Scrin has been running the demo at [lab.ruuvi.com](http://lab.ruuvi.com) for years and might have some advice.

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