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How Do I Calibrate My Murphy Cup/Float?

September 24, 2018

All Murphy Dials are calibrated before leaving the factory and do NOT need to be re-calibrated before use. That being said, below are instructions for confirming the dial’s proper calibration.

  1. Fill your Murphy Cup with a syrup sample OR place your Murphy Float in a vessel of syrup. Use the Temperature Key to match the Murphy Dial reading to a Temperature.
  2. IMMEDIATELY, use a CERTIFIED Fahrenheit thermometer to test the temperature of the SAME syrup sample, in the SAME vessel.  NOTE: Syrup temperature could change over time, so you need to make it snappy. The reading of your certified thermometer should match the temperature that was determined in Step 1. If the temperatures do not match, double check with a second certified thermometer.
  3. If you are absolutely sure that an adjustment needs to be made on your Murphy dial, use the screw on the back of the dial to adjust accordingly.

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Gary Whitman

February 18, 2020

My Murphy cup has 2 blue lines. Can I calibrate with crushed ice and still be accurate?

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February 18, 2020

We do NOT recommend that you ever change your Murphy dial. It was already pre-calibrated before you received it.

The very first version of the Murphy Dial did have an additional blue line which indicated where 32ºF was located. According to the temperature chart provided above, you will see that the 32ºF mark is located between the 68 and 69 mark.

If you are seeking to verify the calibration of your Murphy Dial, the procedure described above is what we recommend.

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Virginia Chichester

March 9, 2020

My murphy cup will not go past the 61 mark even my my hydrometers says it’s ready and the temp is 211. Tried it several times and it stays at 61. So what do I do ?

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March 11, 2024

So what do you do if the Murphy cup is off and you cannot adjust with the screw on the back after being brand new? Tested with 2 different hydrometers and both say it’s done but the dial won’t go any higher than 59 3/4?..


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