# Doubts on ITC 308 T° control

**URL:** <https://community.inkbird.com/t/doubts-on-itc-308-t-control/129>\
**Category:** Uncategorized\
**Created:** [October 30, 2021, 4:09pm UTC](https://community.inkbird.com/t/doubts-on-itc-308-t-control/129 "2021-10-30T16:09:56Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Fabricius](https://avatars.discourse-cdn.com/v4/letter/f/5e9695/32.png) [@Fabricius](https://community.inkbird.com/u/Fabricius)\
**Post date:** [October 30, 2021, 4:09pm UTC](https://community.inkbird.com/t/doubts-on-itc-308-t-control/129/1 "2021-10-30T16:09:56Z")

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Hello

I have purchase an Inkbird ITC-308 Temperature controler , which I connect (via the “heating” plug of the ITC-308 ) to a Biogreen Palma 2.0 electrical heater for heating my greenhouse.

When the Biogreen heater is not activated, the T° measured/shown by the Inkbird ITC-308 is very similar (difference \< 1/10th C°) to T° measured by 2 other different sensors (differend brands). The wired probe of the Inkbird ITC-308 is very close (few cm) to the 2 other sensors.

As soon as the electrical heater is activated by the Inkbird ITC-308 (because the “Set T°” has been reached), the T° shown by the Inkbird ITC-308 rise much quicker than the T° shown by the 2 other sensors (T° shown by the 2 other sensors rise much more slowly but remain coherent between them).

It looks like the Inkbird ITC-308 Temperature controler measure/shows an overestimated T°when it activates the heater.

What could be the cause of this problem, and I can I solve it ?

Thks

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**Author:** ![Tania](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/tania/32/88_2.png) [@Tania](https://community.inkbird.com/u/Tania)\
**Post date:** [November 1, 2021, 2:27am UTC](https://community.inkbird.com/t/doubts-on-itc-308-t-control/129/2 "2021-11-01T02:27:26Z")

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Hello,  
Can I know the deviation between the probe of ITC-308 and the other two sensors after heating?  
Because the probe of ITC-308 is sensitive, it captures subtle changes in temperature, which may cause this problem.  
If you want to make their readings close, maybe you could place the probe of ITC-308 slightly away from the heater to make its reading change close to the other two sensors?  
Can it work?

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**Author:** ![Fabricius](https://avatars.discourse-cdn.com/v4/letter/f/5e9695/32.png) [@Fabricius](https://community.inkbird.com/u/Fabricius)\
**Post date:** [November 1, 2021, 9:33am UTC](https://community.inkbird.com/t/doubts-on-itc-308-t-control/129/3 "2021-11-01T09:33:53Z")

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Hello

The difference was up to 3 C° sometimes, but I think that, as you mentioned, maybe the two other sensors have more thermal inertia than the ITC probe, and they take more time than the ITC to show the actual T° when the T° rise quickly.

I will make complementary measures and will let u know.

Thks for having reverted to me.

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**Author:** ![Tania](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/tania/32/88_2.png) [@Tania](https://community.inkbird.com/u/Tania)\
**Post date:** [November 2, 2021, 3:41am UTC](https://community.inkbird.com/t/doubts-on-itc-308-t-control/129/4 "2021-11-02T03:41:00Z")

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Ok, if there is any news, please feel free to let me know 🙂