How does a 50 degree thermometer work?

[rayjavu]

I need a syrup pan thermometer. I know how a standard thermometer works but I don't understand a 0-50 thermometer works. Does 0 = 212 deg F or what?
:?:

[johnallin]

If it's what I think your referring to; it's used at the draw-off. It's adjustable and is set to zero at the boiling point of water. When you see 7 degrees over zero; it's time to start checking density...

[maple flats]

Correct, on the side of the thermometer face you will see an allen set screw. When you test for the boiling point of water at that time, you turn the face so 0 is at that boiling point and tighten the screw.
However, since I got my auto draw I do not check. What I now check is my draw off density. When the draw off valve opens I test it from my draw off tank after the valve closes to be sure it is right. I wait til the valve closes because that way I get the average for the whole draw cycle. This is where a "Murphy cup" is handy.

[rayjavu]

Thanks for the info!

[maple maniac65]

It is a lot easier to read 7 on a thermometer than 219. Especially if you are doing other things he in the sigarhouse