Understanding Stack Temperature
Maple syrup is said to be finished when it reaches 7ºF above the boiling point of water. A 0 – 50 Maple Thermometer is used with a maple evaporator to monitor progress. Since the boiling point of water fluctuates with barometric pressure and other environmental factors, many folks make it a practice to calibrate their Maple Thermometer before starting up their evaporator each day.
Abbreviated instructions for calibration are noted on the face of your Maple Thermometer. For more detailed and illustrated instruction, please download our INSTRUCTION SHEET.
In a nutshell, you place the stem of your thermometer in boiling water so that the stem is immersed up to the dimple mark. You will let the arrow on the dial make a full revolution and then use the screw on the back of the dial to make adjustments to the calibration. The arrow should be pointing to “0” in boiling water.
7 Comments
dennis white SR
quick and easy
Robert Storer
What happens if I dropped my thermometer into the boiling water
Angela
Hi Robert
Sorry I cannot be there to help inspect your thermometer. Do you see any water inside the glass? If so, you might try putting the therm in a container of rice to help draw out the moisture. Sometimes that helps. A waterlogged thermometer dial may struggle to function properly.
Marc
So is the maple syrup finished when it reaches the 7° mark? Or do you still need to do a finish boil on the stove?
Angela
Hello,Ideally you would do all of your boiling on your evaporator. The best way is to draw off either at perfect density (which can be tricky) or slightly over density. That way, in order to bring it back down to perfect density, all you need to do is slowly stir in raw sap or distilled water. You don’t need to boil it again a second time. This helps streamline and make things more efficient.
Use your thermometer on your evaporator to monitor progress and get close. Then verify density with a hydrometer and Murphy Cup for best precision.
Thanks!Angela
Joyce Johnson
I tried calibrating my thermometer by following the instructions. I set it to zero while submerged in the boiling water and once I took it out the setting is at 11, shouldn’t it go back around to zero? Please help
Angela
Hi Joyce. Please use the knob on the back of the thermometer to calibrate the thermometer. Yes, it should be zero in boiling water.