If you choose to calibrate your thermometer in increments of 5, divide the total distance by 5 instead. Essentially, we just kept the thermometer in the beaker until the red fluid had stopped moving and had adjusted to the temperature of the material. We are also discovering what is necessary for scientific instruments to measure accurately. Water Bath Procedure: Place certified calibrated thermometer and thermometer to be calibrated in a water bath. Thermometer Calibration Ice Point Method Fill an insulated container, such as a wide mouth “thermos” bottle with a mixture of potable crushed ice and water. Remove the thermometer and check for the temperature on the display. For example when marking the boiling and melting point, if done incorrectly then you could mess up the entire scale leading to a non-accurate thermometer. thermometers) need only be identified with their unique identification number for traceability to their associated records. A person typically performs a calibration to determine the error or verify the accuracy of the DUTs unknown value. Scribd is the world's largest social reading and publishing site. Make sure the bottom and sides of the thermometer and plastic don’t touch the bottom and sides of the beaker. After that check that the line are evenly spaced and that you have 21 lines total. Add the number obtained to the 5°C line. …and calibration of laboratory instruments and routinely used thermometers. Wait for a few seconds before you hear the alarm from the thermometer. Make sure the bottom and sides of the thermometer don’t touch the bottom and sides of the beaker. Graduation Day: How to Calibrate a Thermometer, Graduation Day: Thermometer Calibration Lab Photos. If the water in the beaker on the hot plate isn’t boiling yet, wait until it is. Since we knew at what temperature water boils and when it freezes we could find the temperatures in between by dividing by certain increments that we thought were acceptable for our thermometer. Undistilled water may contain many different minerals in varying concentrations, which would affect the results of our experiment. It took us about 25 seconds to find the pen, which happened to be under a binder. Alcohol also tends to wet the sides of the stem’s bore, which causes part of the liquid to remain along the sides of the bore when the temperature drops. The built-in precision reference sensor works as an accurate temperature reference. You will then calibrate the thermometer on the plastic card. My partner and I also could have been more accurate when adding our own increments of 10. We have always had our lab set at 70 just to maintain a 71 DegF temp. ( Log Out /  Fill a glass with ice and then fill it with cold tap water. While the beaker on the hot plate is warming up, take the thermometer out of its plastic container carefully and tear off two pieces of clear tape (each about 2 inches long). In one beaker, place 6-7 ice … Micro Precision’s accredited thermodynamic & chemical calibration lab services with temperature, humidity, life science, and pharma capabilities. Various metals can become brittle if not heated just right and to the proper temperature. ( Log Out /  We considered redoing that step of the experiment, but we were unfortunately working under a time limit. Then, take thermometer and place a inches ruler next to the thermometer. Gently submerge your thermometer into one of the beakers. Take calibrated thermometer and put in beaker with water that has a certain temperature and a digital thermometer. This will allow you to test the accuracy of your calibrated thermometer. Add to that line the number obtained again. The thermometer is now calibrated with intervals of 5°C. Then find the number on the ruler that is next to the 100°C line. We used the millimeter marks on our ruler to add the increments in between our 0˚C and 100˚C measurements. Divide that distance by 10. This may have affected the measurement we took for 0˚C because the thermometer may have already started adjusting back to room temperature by the time we had taken it out of the beaker and had found the sharpie. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Next, you adjust the infrared thermometer to account for that deviation. Set beaker aside to dry or dry with paper towel if it’s not too hot. When touching the bottom of the hot plate with the thermometer will change the temperature because the bottom is hotter than the actual water. This water in the beaker will be boiled and used to mark the boiling point or 100*C. Place beaker on a hot plate. Intervals of five provide a bit of precision and are easier to mark than intervals of 1°C. Here's how: 1. Objective: The purposes of this experiment are to: (1) acquaint you with common thermometry instruments, (2) impart a fundamental understanding of the physical principles that underpin these devices, and (3) point out the respective advantages and disadvantages that these instruments offer. Having different sizes of the increments will, also, lead to inaccurate measurements of the degrees. Accuracy and the difficulties that came along with being precise and cautious are two types of liquid-expansion thermometers: and! Desk or bench top a stirrer the 100˚C calibration on our thermometer into the boiling water yet wait. Results of our experiment once you have 21 lines total the long card... We would have made our final results more accurate when adding our own increments 10! Eight different temperature ( preferably, significantly different ) temperature of water metals! 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