Stirred bath or furnace method: The option between stirred bath or furnace is used based on the temperature requirements. Make sure the sensing area is underwater and not touching the sides of the container. For the ice slurry method, the reading should be zero degrees Celsius. Put the thermometer stem or probe into the ice water. For the boiling water method, sit your food thermometer in boiling water. Put the thermometer stem or probe into the ice water. To use the boiling point method, simply place the thermometer probe or stem into the container with boiling water and wait for at least 30-seconds or until the indicator on the thermometer stops moving. Step 2 - Use the Calibrations Methods. How do you calibrate a bimetallic stemmed thermometer. But you should occasionally check the accuracy using either the ice water or boiling water method of calibration. How to calibrate an IR thermometer> We want to help you with the simpler calibration method, which is to use a Fluke 4180 Precision Infrared Calibrator in its standard configuration. These methods would require a minimum of three thermometers â¦ Wait 30 seconds or until the reading stays steady. Video transcript: This video demonstrates two methods for calibrating a digital thermometer: first, with ice and boiling â¦ There are a couple ways to calibrate your thermometer: (1) ice point method and (2) boiling point method. Two methods to calibrate thermometers. 1. Boiling-point method. Stir the mixture well. Thermometers in use will be checked against a certified thermometer during calibration, if available. The boiling point method is mainly used by food handlers who work with extremely hot food, such as in candy making. If you are using the boiling point of water to calibrate a thermometer, you must estimate the boiling point is based on your altitude. Calibration Methods. With this non-contact method measurement uncertainty is on the order of 0.5 °C (0.9 °F), but it is much simpler. Wash with soap and warm water and dip in a sanitizing solution or wiped with an alcohol pad. The reading on the thermometer should be 100 degrees Celsius or 212 degrees Fahrenheit. Once you get your device for the first time, you need to calibrate it. Make sure the sensing area is under water. In general, for each 293 meter (960-foot) increase in altitude the boiling point changes by 1ºC (1.8ºF), however, it is the change in atmospheric pressure that causes the change in the boiling point. Boiling-point method Ice point method. A THERMOMETER Using the Ice-Point Method to Calibrate a Thermometer Fill a large container with crushed ice. Weâll discuss how to calibrate your thermometer using the boiling point method. The ice bath method; The boiling water method; You can use either method you like, so long as the thermometer you are calibrating has that value in itâs range, and not all of them do. Add clean tap water until the container is full. Bring water to a boil 2. Otherwise, all thermometers will be calibrated either against each other, or against a thermometer that is used only during calibration. Remember that thermometers come into contact with food so be sure to clean and sanitize your thermometer after each use. Submerge the sensing area of the thermometer stem or probe in the water for 30 sec 3. Fill a large container with ice. Stir the mixture well. Wait 30 seconds or until the reading stays steady. This is to ensure that it will give accurate readings at all times. Thermodynamic fixed-point calibration is the most accurate way to calibrate a thermometer. First of all, you have to know the right time that you need to calibrate your thermometer. The dry-block calibration method provides a better measurement because weâre working with instruments that have a known accuracy. Two of the most acceptable methods to check the accuracy of your food thermometers is by boiling water and an ice water slurry. Additionally, after being knocked or dropped, calibration is required to make sure it is still reading accurately. Hold the calibration but and rotate the thermometer head until it reads 212 degrees f. For example, a Kamado Joe dome thermometer doesnât have markings for temps under 150f, ruling out the use of iced water to calibrate. The reading should be 100 degrees Celsius. Add clean tap water until the container is full.