Atc Refractometer

[hoohaaman]

Hi Guys,for an ATC refracometer should the readings be the same if the sample is hot or allowed to cool.

I usually take a small sample allow to cool(room temp) then apply,if I leave the sample to cool further I get a higher reading.

Does the temperature compensation work in both directions?

Thanks

 

[Adamt]

Refraction is temperature dependent. Your refractometer instructions should include which temperature it is calibrated to. If you're not sure... 20C-25C would be a good assumption.

 

[hoohaaman]

Thanks Adamt,it is 20C,I changed grains and crush size.So was second guessing myself.

It's like a compass,even if you think it's wrong.It's right

 

[mika]

Lot of people assume the ATC will take care of any temperature your put on the refrac. Im sure I've read somewhere that this is not the case. I take readings with a spoon, if taken as the boil ends I may try some on the lens after 5 mins or so. If I leave some sample in the spoon and leave it another 15mins the reading will be different. Though I don't know if this is due to the temperature affect, or water evaporating off and the sample concentrating.

 

[hoohaaman]

mika, i never apply from kettle,always wait 5 mins on a spoon also.If wait longer brix increases.

Isn't waiting longer just a below 20c reading?So at a colder temp brix naturally increases?

 

[therook]

Thanks to reVox i picked up my Refractometer yesterday from his place ( thanks for the beers mate )

The one's we got have ATC and from what you blokes are saying is the temp of the sample has to be at 20c....how do you measure the temp of 2 drops of wort? The way i read the instructions is to place 2 - 3 drops on the window, close the lid and wait 30 seconds to take a reading?

Am i reading this right?

Rook