Duke Posted February 21, 2005 Report Share Posted February 21, 2005 Purchased a refractometer from the USA for $90us Auto temperature adjustment etc. Works great. www.benmeadows.com Quote Link to comment Share on other sites More sharing options...
yota Posted February 21, 2005 Report Share Posted February 21, 2005 that price sounds a bit steep to me Duke. i think i only paid about have that for mine from the U S of A :roll: Quote Link to comment Share on other sites More sharing options...
Duke Posted February 21, 2005 Author Report Share Posted February 21, 2005 Does yours have Automatic Temperature Control ? They are quite a bit cheaper with out this option. Quote Link to comment Share on other sites More sharing options...
yota Posted February 21, 2005 Report Share Posted February 21, 2005 yep Quote Link to comment Share on other sites More sharing options...
RnB Posted February 21, 2005 Report Share Posted February 21, 2005 How does ATC work on a refractometer when you have such a small ammount of water... or is it an ambiant temp correction, implying you have to allow the sample to sit for a time on the slide before reading???? Pies - you are normally a source of knowledge on these matters.... ideas? Quote Link to comment Share on other sites More sharing options...
lduncan Posted February 21, 2005 Report Share Posted February 21, 2005 I think it uses the expansion of a metal to alter the distance of the reading lines with temperature. Once the water sample reaches the same temp as the refractometer, then it is temperature compensated. (water's optical density changes with temp, which changes how much the light refracts (bends) when entering the sample) Layton Quote Link to comment Share on other sites More sharing options...
RnB Posted February 21, 2005 Report Share Posted February 21, 2005 that was my thinking also... thermocouple action going on... this does imply that you would have to wait for temp of sample to equalise with the unit, and if the unit had been stored in a cold cupboard etc... it may take a little while..... Quote Link to comment Share on other sites More sharing options...
lduncan Posted February 21, 2005 Report Share Posted February 21, 2005 I don't think thermocouple, more a metal with a high thermal expansion coefficient. this does imply that you would have to wait for temp of sample to equalise with the unit Yip and if the unit had been stored in a cold cupboard etc... it may take a little while..... Maybe. Water has a relatively high specific heat capacity, and glass (or whatever they use for the viewing window), has a relatively low heat transfer coefficient. Layton Quote Link to comment Share on other sites More sharing options...
nodle Posted February 23, 2005 Report Share Posted February 23, 2005 My refractometer arived yesterday and sorry to say Duke but i think you got stung i payed $85nz landed and is calabratable with ATC. Says in the instruction to leave sample in refractometer for at least 30seconds before taking reading so i think layton is right Once the water sample reaches the same temp as the refractometer, then it is temperature compensated. also states that it sould be calabrated at 20 dgrees c with RO water. Dave Quote Link to comment Share on other sites More sharing options...
RnB Posted February 23, 2005 Report Share Posted February 23, 2005 who did you buy it through nodle? Quote Link to comment Share on other sites More sharing options...
Duke Posted February 24, 2005 Author Report Share Posted February 24, 2005 The important thing is the women still things I got a great deal..... poor me. Anyway I'm still pleased. Hollywood quoted near $200. So still a good deal as far as I'm concerned. A great tool for piece of mind... 1.0027 was my water reading. Not any more Quote Link to comment Share on other sites More sharing options...
petplanet Posted February 24, 2005 Report Share Posted February 24, 2005 I can sell you a brand new one for $170.00. Will be the same as the one Hollywood is selling. Quote Link to comment Share on other sites More sharing options...
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