Chloe Zhang
When cooking a turkey, it is important to monitor its internal temperature to prevent overcooking or undercooking, which can cause foodborne diseases. The most accurate way to do this is by using a digital or analog meat probe thermometer. These thermometers are inserted into the deepest part of the turkey's breast, ensuring that the probe is not resting against any bone. Bone has different thermal properties than meat, and a probe resting against bone will not give an accurate temperature reading for the meat itself. Some sources suggest using two probes, with the second probe inserted into the thigh, to get a more accurate overall temperature reading. Pop-up plastic thermometers are not recommended as they may not represent the overall temperature of the entire piece of meat and can result in overcooked meat.
| Characteristics | Values |
|---|---|
| Accuracy | Pop-up plastic thermometers are considered inaccurate and inconsistent. |
| Accuracy of a thermistor is within 2 degrees Fahrenheit. | |
| Placement | The probe should be placed in the deepest part of the turkey breast, avoiding bone. |
| The thermal center is the point that takes the longest to cook and is usually the center of the breast in its thickest area. | |
| The probe should be placed horizontally near the neck. | |
| Temperature | The pre-determined temperature of 185 degrees Fahrenheit may result in overcooked meat. |
| The USDA-recommended temperature for whole cuts of pork is 145°F. | |
| The wings and legs must have 175°F – 180°F (79-82°C). | |
| The breast should be at 165°F to 170°F (73-76°C) to kill all germs and bacteria. |
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What You'll Learn
Pop-up plastic thermometers are not accurate
The thermal center of the turkey is the thickest area of the breast, and this is where the temperature needs to be tracked during cooking. This is where the probe should be placed, ensuring it is not resting against any bone, as this will impact the accuracy of the reading. The probe should be inserted horizontally near the neck. The average insertion depth is 10-12cm.
To ensure a perfectly cooked turkey, it is recommended to use an oven-safe leave-in probe thermometer to track temperatures during cooking and an instant-read thermometer to verify the temperature at the end.
Digital or analog meat probe devices can be used to measure the internal temperature of the meat to prevent over or undercooking. It is important to monitor the temperature of the breast during the cooking process, as the breast and leg meats should be cooked at various temperatures.
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Probe placement is critical
It is also important to monitor the temperature of other parts of the turkey, as the breast and leg meats should be cooked at different temperatures. The breast will dry out if overcooked, so a second probe can be inserted into the thigh to monitor this area.
The temperature of the turkey should be gauged while it is still in the oven, and it should not be removed until the internal temperature reaches 165°F (73°C). The wings and legs should reach 175°F–180°F (79–82°C), and the breast should be 165°F–170°F (73–76°C).
Pop-up plastic thermometers are not recommended, as they pierce the skin and allow juices to escape. The predetermined temperature of 185°F may also result in an overcooked turkey.
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The thermal centre of the turkey
To track the temperature at the thermal centre, a leave-in probe thermometer should be used. The probe should be inserted horizontally into the deepest part of the breast, ensuring it is surrounded by an even layer of meat and does not touch any bones. This is because bones have different thermal properties than meat and can affect the accuracy of the temperature reading. The probe's sensor is usually located at the tip of the probe, allowing for precise temperature measurements.
It is important to note that the thermal centre of the turkey is not the only area that needs temperature monitoring. The wings, legs, and other parts of the breast also need to reach the recommended temperatures to ensure the meat is cooked safely and thoroughly. Therefore, some cooks recommend using multiple probes or a combination of leave-in probe thermometers and instant-read thermometers to verify the doneness of the turkey.
While plastic turkey probes or pop-up thermometers may be convenient, they are not always accurate. They can pierce the skin and allow juices to escape, and their predetermined temperature settings may result in overcooked meat. Additionally, their placement may not represent the overall temperature of the entire piece of meat, leading to hot or cold spots. Therefore, it is recommended to use dedicated meat thermometers, such as probe thermometers or instant-read thermometers, to ensure accurate temperature readings and a perfectly cooked turkey.
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The accuracy of thermistors
Plastic turkey probes are not recommended by many users due to their inaccuracy. They are inconsistent and often don't pop until the temperature is much higher than intended.
Thermistors are a type of resistance thermometer or thermally sensitive resistor. The term is a combination of "thermal" and "resistor". They are made of metallic oxides pressed into a bead, disk, or cylindrical shape and then encapsulated with an impermeable material such as epoxy or glass. There are two types of thermistors: Negative Temperature Coefficient (NTC) and Positive Temperature Coefficient (PTC). NTC thermistors are the most common type and are used in applications that require very precise temperatures. They are often used in digital thermometers, in cars to measure oil and coolant temperatures, and in household appliances such as ovens and refrigerators.
NTC thermistors exhibit a continuous, small, incremental change in resistance correlated to temperature variations. As the temperature increases, the resistance of an NTC thermistor decreases, and as the temperature decreases, the resistance increases. This allows for high precision within a limited temperature range of about 50ºC around the target temperature. NTC thermistors can be highly accurate, especially when used in conjunction with a Wheatstone Bridge, which allows for the accurate reflection of small temperature changes.
Thermistors come in various shapes such as disks, chips, beads, or rods, and can be surface-mounted or embedded in a system. They are easy to use, inexpensive, sturdy, and respond predictably to changes in temperature. However, they do not work well with extremely hot or cold temperatures. When choosing between a thermistor and a thermocouple, it is important to consider the specific requirements of the application, as both have their advantages and can operate within a wide range of temperatures.
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Using two probes
First, it's important to understand the concept of the thermal centre. The thermal centre of a turkey is the point that is furthest from the exterior of the meat and, therefore, takes the longest to cook. This is usually found in the centre of the breast, in its thickest area. This is the ideal spot to place your first probe as it will give you the lowest temperature reading, ensuring that your meat is safe to eat.
When using two probes, place the first probe in the thickest part of the breast, horizontally. This will allow you to monitor the interior temperature of the breast throughout the cooking process. Make sure the probe is inserted perpendicularly to reach the maximum depth, avoiding the cavity area, as this will affect the accuracy of the reading.
The second probe can be placed in the thigh area, just like when cooking a chicken. This will provide additional information on the temperature of the meat. Ensure that the probe is inserted to the same depth as the first probe for consistency.
It is important to use heat-resistant probes that are oven-safe and designed to be left in the meat during cooking. Additionally, remember that the breast and leg meats should be cooked at different temperatures, so consider using a second thermometer to verify the doneness of each area.
By using two probes in these locations, you can ensure that your turkey is cooked evenly and safely. Remember to also take into account the temperature gradients and adjust your cooking temperature accordingly to avoid overdone meat around the borders.
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Frequently asked questions
Plastic turkey probes, also known as pop-up thermometers, are considered to be inaccurate. They often don't pop up until the temperature reaches 185-190 degrees Fahrenheit, which may result in overcooked meat. They also don't account for the overall temperature of the entire piece of meat, leading to hot and cold spots.
Alternatives to plastic turkey probes include thermocouple thermometers and thermistors. Thermocouple thermometers are the fastest available and can check temperatures in a variety of locations very quickly. Thermistors, on the other hand, take about 10 seconds to register the temperature and are not designed to remain in the food while cooking.
To ensure accurate probe placement in a turkey, it is recommended to insert the probe horizontally into the thickest part of the breast, avoiding the bone. The probe should be surrounded by an even layer of meat on all sides. This allows for accurate temperature tracking during the cooking process.
