How To Calibrate Your Walk-In Thermometer

Temperature control is absolutely crucial for a walk-in cooler or freezer. The refrigeration system of your walk-in cooler unit relies on the thermostat to tell it what temperature it should operate it, however the only way to really tell what the temperature actually is inside the unit is with thermometers. The only downside to thermometers is that sometimes they need calibration to be sure they are indicating the proper temperature inside the unit. If you notice that the temperature seems off inside your unit, and a check of the equipment seems to indicate there is no damage, then a thermometer calibration may be needed.

 

There are two main types of thermometers - dial thermometers and digital thermometers.

 

Dial thermometers are the standard, mechanical thermometers that have been around forever. They use a dial to show on the gauge what the temperature is. To calibrate a dial thermometer follow these steps:

 

  1. Take the dial thermometer and remove the ‘lens’ by either un-threading it by turning it counter-clockwise, or if its a press-in lens you can pry the lens off. This will expose the pointer.
  2. Take a glass or insulated mug and fill it with crushed ice and water, stirring the water and letting it sit for 5 minutes until all of the ice is melted.
  3. Take the thermometers sensitivity probe, and insert it into the center of the cup of melted ice water. Let it stand there for about 30 seconds and check the temperature gauge. You should see a temperature of 32°F, or 0°C. The pointer will stop moving, and that will be your final temperature. If the temperature does not read 32°F, or 0°C you need to calibrate.
  4. If the temperature reads high, you need to insert a screwdriver into the slot in the pointer hub (where the pointer is connected to the unit) and slowly and carefully turn the pointer hub clockwise until you reach the desired setting of 32°F, or 0°C. If the temperature reads low, follow the same steps as above however when you get the screwdriver inserted into the pointer hub you are going to want to turn the pointer hub counter-clockwise to reach 32°F, or 0°C.

 

For digital thermometers it should be a bit of an easier process, since there is usually a reset or calibrate button with these thermometers that allows you to recalibrate. Similar to calibrating a dial thermometer, follow these steps below to recalibrate a digital thermometers.

 

  1. Disconnect the digital thermometer face from the unit and check for any damage.
  2. Take a glass or insulated mug and fill it with crushed ice and water, stirring the water and letting it sit for 5 minutes until all of the ice is melted.
  3. Take the thermometers sensitivity probe, and insert it into the center of the cup of melted ice water. Let it stand there for about 30 seconds and check the temperature gauge. You should see a temperature of 32°F, or 0°C. The pointer will stop moving, and that will be your final temperature. If the temperature does not read 32°F, or 0°C you need to calibrate.
  4. If the temperature is off at all, there are two options. If there is a recalibration button, reset the recalibration using this button and then repeat steps 2 and 3 to retest and ensure that it is reading the proper 32°F, or 0°C temperature. Some digital thermometers come with a recalibration screw, and if this is the case use a screwdriver to turn the recalibration screw until you hit 32°F, or 0°C.

 

Generally speaking the thermometers in most modern units shouldn’t need to be recalibrated that often, if at all. If you find yourself facing any other thermometers, such as digital thermometer not giving back any reading at all, there may be something else wrong with the thermometer and may need repair or replacement. HoodMart provides our customers with a wide range of walk-in coolers and freezers - as well as all walk-in accessories such as door hinges, kick plates, and light fixtures. HoodMart Walkin Coolers are Guaranteed To Pass ALL City & State Codes. ALL HoodMart® Walk-In Coolers and Freezers are UL Listed Panels and Doors, NSF Listed, EISA & U.S. Department of Energy (DOE) Compliant, and Listed and Certified for all States, including City of Houston, State of Oregon, New York City. Custom Hurricane Approved Units Available. If you still have questions regarding the purchase of your walk-in cooler or freezer, please feel free to contact one of our experts today by calling us at 1.800.715.1014 or by contacting us through our live chat system.