Understanding Time and Temperature Control in Food Safety

2.4 million cases of foodborne illnesses are reported each year in the UK. Foodborne hazard is a significant issue with common pathogens like Campylobacter, Norovirus, Salmonella, and E. coli. In 2024, the UK experienced major outbreaks, such as the large Shiga toxin-producing E.coli. 

In such a scenario, time and temperature control in food safety is a critical issue for all. All food companies in the UK are under a legal obligation to make sure that the food they put on the market is safe.

In this blog, we will help you with valuable insights on how you can maintain time and temperature control for your food safety. You will also get additional information about food safety, hygiene, and good health.

What is Time & Temperature Control?

Time & Temperature Control (TTC) is also known as Time and Temperature Control for Safety (TCS). 

It is an effective food safety method that controls the temperature of food processes, particularly the high-risk foods, within the Temperature Danger Zone (40F to 140F or 5 °C to 60 °C). It prevents the multiplication of bacteria in potentially harmful foods.

Storage of cooked foods, dairy products, cooked meat and vegetables, cooked rice, etc., should be done between 40F to 140F or 5 °C to 60 °C in limited storage periods. This will help prevent food poisoning, food hazards, and foodborne illnesses.

What Are the Key Points of Time & Temperature Control for Food Safety?

Make sure to keep the temperature of food in the Temperature Danger Zone by making cold food temperatures below 5 °C and hot food temperatures above 60 °C.

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Let’s take a glance at the key points of TCS (Time/Temperature Control for Safety) in food safety!

• Temperature Danger Zone

The maximum time of food should not exceed 5 °C to 60 °C for more than 4 hours, though the best time would be 1-2 hours, especially at 37 °C.

• Hot Holding

Hot foods like cooked rice, meats or veggies, and any other high-risk foods must be kept at 140 °F (60 °C) or higher. 

• Cold Holding

Store cold foods at 5 °C or lower. You can store cooked foods in the refrigerator after cooling them for 30-40 minutes.

• Reheating

Reheat food in 15 seconds and the temperature inside to 165 °F (74 °C) in 2 hours.

• Cooling/Refrigerating

Chill cooked food at 60 °C to 21 °C in 2 hours and 21 °C to 5 °C or lower in the next 4 hours (a total of 6 hours).

What is the Role of Temperature Control in Food Safety?

Food safety requires very high temperature control as it regulates the growth of dangerous bacteria. Warm temperatures tend to kill or decrease the reproduction of pathogens, whereas low temperatures cause the reproduction of pathogens to increase gradually to hazardous levels.

Bacteria develop in the temperature danger zone. Temperature control also helps in preventing food poisoning and food spoilage. We will have a glance at the role of temperature control in food safety!

• Prevents bacterial growth

There are low-temperature methods used to prevent the growth of bacteria (ie, refrigeration) and high-temperature methods used to kill bacteria (ie, cooking).

• Avoids the temperature danger zone

Bacteria grow optimally at temperatures of 5 °C- 60 °C (40 °F- 140°F). Other food zones are given below:

• Averts foodborne illnesses

Salmonella, E. coli, and Listeria are some of the bacteria that can cause toxins or reach uncontrollable levels in the food that is held at high temperatures for too long.

• Lowers food wastage

Adequate maintenance of temperature prolongs the shelf life of food, decreasing the wastage.

• Assures safety after cooking

Hot holding maintains the safety of food after cooking, and proper cooling/freezing ensures bacteria will not be reborn and develop.

Food contamination is also prevented by temperature control. Food poisoning, food allergies and food-related illnesses are some of the food hazards caused by contaminated foods.

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How to Maintain Time and Temperature Control in Food Safety?

The Time and Temperature Control for Safety (TCS) of food safety must be kept at the proper temperature to prevent the proliferation of dangerous bacteria.

Here, we will help you with a step-by-step guide to maintain the time and temperature control to ensure your food safety.

Step 1: Learn about the key points of Temperature Control

Learn about the Temperature Danger Zone. The range of danger is between 40 °F and 140 °F (5°C to 60 °C). Store cold foods at temperatures of 5 °C or less.

Maintain the temperatures of hot foods at a minimum of four-hourly intervals so as to implement corrective measures in case the food has entered the temperature danger zone.

Step 2: Maintain the temperature for cooking and reheating food

Follow the instructions of correct cooking and reheating of food, which is to be maintained at specific temperatures within a certain time frame to kill the pathogens.

Reheating previously cooked and cooled foods should reach 165F (74 °C) within 2 hours. 

Step 3: Cool food at the appropriate temperature

You can follow the two-stage cooling method. Misunderstood cooling is one of the main causes of foodborne disease. 

• Stage 1: Freeze at temperatures between 135 °C and 70 °C within 2 hours. 
• Stage 2: Freeze at temperatures between 70 °C and 40 °C in the next 4 hours (total 6 hours). Rapidly freeze at 135 °C- 70 °C and then at 40 °C when using shallow pans, ice water baths, ice paddles, or blast chillers. 

Step 4: Maintain safe thawing of food

Food is not to be stored at room temperature. You can use the following approved procedures,

• Fridge: It is the most secure method; the preparation must be made in advance (approximately 24 hours).
• Cold Water: Place the food in running water of 70 °C or below.
• Microwave: Only when cooking immediately after.
• Cooking: Thaw as part of the ongoing cooking, such as the frozen hamburger patties.

Step 5: Follow time limits

• The 2-hour rule: High-risk foods that have a perishable nature must not be stored in the danger zone more than 2 hours, 1 hour at 90°F (5 °C) or colder. 
• The 4-hour rule: Foods that have been prepared on a site should not be stored more than 4 hours in the danger zone.
• The 7-day rule: Perishable food (high-risk food) may be refrigerated at a minimum of 5 °C to a maximum of 7 days.

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Step 6: Equipment and thermometer calibration

Periodically check the probe thermometer with the Ice Point Method (must be at 32F /0 °C) or the Boiling Point Method (212F/100 °C). Record receiving, refrigeration and cooking logs to show that it met safety standards.

According to the Food Standards Agency (FSA), the standard advice to cook food is until it has reached a core temperature of 70°C for 2 minutes.  

The other time and temperature combinations are:  

• 60°C for 45 minutes. 
• 65°C for 10 minutes. 
• 70°Cfor 2 minutes. 
• 75°C for 30 seconds. 
• 80°C for 6 seconds. 

Cooking food at the right temperature and for the correct length of time will ensure that any harmful bacteria are killed. 

Frequently Asked Questions (FAQs)

Conclusion

There are several reasons as to why time and temperature control in food safety are very important to maintain quality, yet most importantly to ensure safety. If you’re a food business owner or working in the food industry, you have an obligation to adhere strictly to food safety guidelines.

It is also important to control the temperature of production areas, ingredients, and products during each storage and transport (pre- and post-manufacturing and cooking) process to guarantee compliance with the audit and food safety. The level of bacteria that spoils food and makes people ill can be controlled by regulating the temperature. 

When you deal with food manufacturing or preparation, it is your mandate to ensure that foods do not take up the risk area because of the approved ways of cooking, chilling, heating and maintaining foods.