Equipment Calibration
The process of checking and adjusting measuring equipment to ensure accuracy, critical for food safety temperature monitoring and weighing.
Equipment calibration ensures that your measuring instruments — thermometers, scales, timers, and temperature monitoring devices — give accurate readings. In food safety, inaccurate equipment can have serious consequences: a thermometer reading 5°C too low could mean you are serving undercooked food, while an inaccurate scale could lead to incorrect allergen labelling. Calibration is a key part of your HACCP system and something Environmental Health Officers will check during inspections. Maintaining calibration records demonstrates due diligence and compliance with food safety regulations.
Key Points
- Probe thermometers should be calibrated at least monthly using the ice point method
- Scales should be checked weekly with certified calibration weights
- Any equipment failing calibration must be removed from service immediately
- Calibration records are essential evidence for EHO inspections
- Inaccurate equipment can lead to food safety failures and allergen risks
What Equipment Needs Calibrating
In a hospitality business, the key equipment requiring regular calibration includes: probe thermometers (the most critical — used for checking cooking, cooling, and storage temperatures), fridge and freezer thermometers, scales used for portion control and allergen-critical recipes, timer devices, and any automated temperature monitoring systems. pH meters, if used, also require calibration. The principle is simple: any measuring device that feeds into a food safety decision must be accurate.
How to Calibrate Common Equipment
For probe thermometers, the ice point method is the standard: fill a container with crushed ice and a small amount of clean water, stir, insert the probe avoiding the sides and bottom, and it should read 0°C ±1°C. For scales, use certified calibration weights and check at multiple points across the scale range. For fridge/freezer thermometers, compare readings against a calibrated reference thermometer placed in the same location. Digital monitoring systems should be verified against a traceable reference device at least quarterly.
Calibration Records and Frequency
Keep a calibration log showing: the equipment identifier, calibration date, method used, reading obtained, whether it passed or failed, and any corrective action taken. Probe thermometers should be calibrated at least monthly (weekly in high-volume operations). Scales should be checked weekly. Fridge/freezer thermometers should be verified monthly. Any equipment that fails calibration must be taken out of service, recalibrated or replaced, and any food safety decisions made using the faulty equipment should be reviewed.
Frequently Asked Questions
How do I calibrate a food thermometer?
The simplest method is the ice point check. Fill a container with crushed ice and a small amount of clean water, stir to create a slurry, then insert the thermometer probe avoiding contact with the sides and bottom. The thermometer should read 0°C ±1°C. If it does not, adjust it according to the manufacturer's instructions or replace it. Record the calibration check in your food safety records.
How often should kitchen equipment be calibrated?
Probe thermometers: at least monthly (weekly recommended for high-volume kitchens). Scales: weekly. Fridge and freezer thermometers: monthly. Automated temperature monitoring systems: quarterly against a traceable reference. Always recalibrate after dropping or damaging equipment, and after battery replacement.
Do I need to keep calibration records?
Yes. Calibration records are an important part of your HACCP documentation and demonstrate due diligence. EHOs will want to see evidence that your measuring equipment is accurate. Records should include the date, equipment ID, method used, result, and any corrective action taken.
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