It is essential that foods are cooked and reheated to the correct temperatures to ensure food safety. Failure to do so allows dangerous pathogens to proliferate, potentially causing foodborne illnesses. This not only jeopardizes the health and safety of your guests but also poses significant risks to your business, including loss of trust, damage to your reputation, negative media attention, lawsuits, legal fees, decreased staff morale, and skyrocketing insurance premiums. To mitigate these risks, it is critical to understand the minimum internal cooking temperatures for each food type and how to properly verify them.
Minimum Internal Cooking Temperatures
Ensuring that food reaches and maintains its minimum internal cooking temperature for the required duration is imperative to eliminate pathogens to safe levels for consumption. What are these minimum internal temperatures? They vary by product. The following temperatures and times are strictly mandated for foods requiring Time and Temperature Control for Safety (TCS foods)—a designation for items in which pathogens thrive. These include dairy products, shell eggs, meat, poultry, fish and shellfish, baked potatoes, heat-treated plants such as cooked rice, beans, and vegetables, soy protein like tofu, sprouts, sliced melons, tomatoes, cut leafy greens, and untreated garlic-and-oil mixtures. TCS foods are not to be confused with ready-to-eat foods, which do not require further preparation or cooking, although they still demand stringent handling to avoid contamination.
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If a customer requests a lower cooking temperature, you must clearly inform them of the increased risk of foodborne illness. It is crucial to understand that while cooking to the correct temperatures significantly reduces the risk of pathogens, it does not eliminate any toxins or spores that may have been produced. Therefore, you must adhere to proper food safety practices and handle the food correctly before cooking to ensure safety at every step.
Always keep the temperature danger zone in mind. Bacteria thrive between 41ºF and 135ºF, and multiply rapidly between 70ºF and 125ºF. Therefore, it is crucial that food never enters this temperature range. To prevent contamination, food must not only be cooked to its minimum internal temperature but also maintained at proper temperatures throughout. Consistent and frequent monitoring is a non-negotiable aspect of any commercial foodservice operation. Read more about food safe temperatures, the temperature danger zone and how to avoid time-temperature abuse here.
Thermometer Types
At the most basic level, there are 2 types of thermometers. Digital & Dial (or Analog). Digital thermometers are generally considered more accurate, offering readings within 1-2 degrees. They are easier to read, offer a faster response time and are more precise. Dial thermometers are often less expensive, beneficial when you need a rough estimate of temperature and can be easier to use.
To ensure your food reaches the proper internal temperature and is maintained at safe levels, it is essential to know how to check it effectively. This begins with selecting the appropriate thermometer. There are three primary types of thermometers you'll encounter, along with four basic types of probes.
1. Bimetallic Stemmed Thermometers
A common type of thermometer, the bimetallic stemmed thermometer, can measure temperatures from 0°F to 220°F, making it ideal for checking products throughout the food flow process—from receiving to periodic monitoring during hot or cold holding. One of the key features of this thermometer is its metal stem with a dimple. The sensing area extends up the stem to the dimple, so it’s essential to insert the thermometer deep enough to reach this area when checking temperatures. While it is perfect for measuring the temperatures of large or thicker foods, it is not suitable for thinner products.
2. Thermocouples and Thermistors
Like the bimetallic stemmed thermometer, thermocouples and thermistors use different technology inside. These thermometers display temperatures digitally, and the sensing area is located at the tip of the probe. This design makes them excellent for checking both thick and thin foods, as they require less insertion into the product.
3. Infrared laser thermometer
A less common type of thermometer is the infrared laser thermometer, which is sometimes used to measure the temperatures of food and equipment surfaces. The key advantages of this type are its speed and ease of use, as it doesn’t require contact with the surface to obtain a reading, reducing the risk of cross-contamination. However, it has its limitations—it cannot measure air temperature or the internal temperature of foods.
Probe Types
After determining which of the above types is right for you, the next step is to select the correct probe. There are four main thermometer probe types:
1. Immersion Probe
This type of thermometer is designed for measuring the temperature of liquids or semi-liquids, such as soups, sauces, or water. The probe is typically inserted into the liquid to get an accurate temperature reading.
2. Surface Probe
Surface probe thermometers are used to measure the temperature of flat surfaces, like grills, griddles, or other cooking equipment surfaces. These are ideal for checking the temperature of equipment rather than food products.
3. Penetration Probe
This thermometer is designed to measure the internal temperature of thicker food products. It is inserted into the center or thickest part of the food to ensure that it has reached the proper temperature for safety.
4. Air Probe
Air probe thermometers are used to measure the temperature of air in environments like ovens, refrigerators, or storage areas. This helps ensure that the air temperature is at the proper level for food safety or proper storage.
Each of these probes is specialized for different applications, making it important to use the correct one for accurate temperature readings in foodservice settings.
Checking Temperatures
To accurately check temperatures and ensure food has reached its minimum internal temperature, it’s essential to choose a thermometer with the appropriate probe size for the food. For larger cuts of meat or roasts, a bimetallic thermometer with a penetration probe is ideal. For thinner products, such as hamburger patties, a thermocouple thermometer is typically the better choice.
Insert the probe into the thickest part of the food and wait for the reading to steady. Bimetallic thermometers traditionally take a little longer than digital thermometers. Allow at least 15 seconds, and then take a second reading in different locations to confirm it is safe to serve.
Thermometer Use and Care
A thermometer used to measure food temperatures must be accurate within ±2°F. Over time, thermometers can lose their accuracy and need to be calibrated to restore proper function. Calibration is required after the thermometer has been dropped or bumped, exposed to extreme temperature changes, before receiving new deliveries, and at the start of each shift. Some thermometers cannot be calibrated and must be replaced, while others may need to be sent back to the manufacturer for recalibration. Always follow the manufacturer's instructions for calibration. The most common method for calibrating a thermometer is the ice-point method.
To calibrate using the ice-point method:
- Fill a large container with ice (crushed ice preferred if available). Add tap water until the container is full.
- Put the thermometer stem or probe into the water, ensuring the sensing area is submerged. Hold for 30 seconds, or until the indicator stops moving, careful not to let the stem touch the container.
- Adjust the thermometer so it reads 32°F. For a bimetallic stemmed thermometer, you’ll adjust by holding the calibration nut with a wrench or similar tool.
Thermometers must be properly washed, rinsed and sanitized before using to prevent cross-contamination. Make sure you always have plenty of thermometers on hand. Check out our blog for more safety guidelines, educational materials, buying guides, tips and tricks, industry trends, and more.
