Calibrating More Than Just Thermometers

While classic bimetallic-stemmed thermometers have largely given way to modern digital alternatives, the act of calibrating them remains a fundamental food safety ritual drilled into foodservice professionals from their first week on the job. However, if your kitchen’s verification strategy stops at thermometers, you leave significant blind spots in your food safety defense system.

Calibration is the process of configuring an instrument to produce results within an acceptable range. In a modern commercial kitchen, we rely on dozens of automated systems, mechanical components, and electronic meters to keep food safe and ensure sanitation compliance. If these systems drift off-target, the consequences can be disastrous. To achieve true operational control, operators must expand their scope and examine three frequently overlooked compliance areas: dish machines, chemical dispensers, and automated data loggers.

Whether you operate a high-temperature sanitizing or a low-temperature machine that uses chemical sanitizers, the built-in gauges are your only immediate window into compliance. The FDA Food Code requires that high-temperature final rinse cycles reach at least 180°F (or 165°F for stationary racks) to ensure the dishware’s surface reaches the required 160°F sanitizing threshold.

However, external mechanical temperature gauges on dish machines can easily lose calibration due to constant vibrations, scale buildup, and regular wear and tear. If a gauge displays 180°F but the water is hitting 172°F, you are inadvertently washing dishes in the danger zone. Verification requires secondary testing. Operators must regularly use single-use dishwasher testing labels that have been run through a full cycle to verify that the performance of the machine matches its readout.

In low-temperature dish machines, three-compartment sinks, and automated chemical dispensing systems, chemical concentration is a matter of balance. Too little chemical results in a failure to sanitize, leaving harmful pathogens behind. Too much chemical can result in chemical contamination of food contact surfaces, presenting a direct hazard to guests.

Automated wall-mounted chemical dispensers rely on small, internal metering tips to pull the precise ratio of water and concentrated chemical. Over time, chemical crystallization, water pressure fluctuations, and mineral buildup can alter these ratios. Relying solely on the dispenser to do its job without regular verification is a gamble. Dispensers must be checked against manual chemical test strips, and the delivery pumps must be adjusted if the parts-per-million (PPM) deviate from manufacturer and regulatory guidelines.

…these tasks depend heavily on your specific operation, including the volume of food you are pushing out, the exact type of equipment you use, and your production system…

As the industry shifts toward digital food safety management, automated Bluetooth and Wi-Fi data-loggers have become the gold standard for monitoring walk-in coolers, freezers, and hot-holding cabinets. These sensors provide incredible peace of mind by constantly tracking ambient temperatures and sending alerts if a unit fails. But technology is not infallible. Automated loggers require regular comparisons to ensure their internal software offset is reading correctly.

To ensure these critical checks do not fall through the cracks, operators should implement a Master Calibration Schedule. Tracking these moving parts requires structured organization rather than memory.

In my experience, there are certain things you need to handle daily, others you can tackle each week, and some that only need attention once a month. Keep in mind, though, that these tasks depend heavily on your specific operation, including the volume of food you are pushing out, the exact type of equipment you use, and your production system. While I know your time is valuable, taking a few hours to critically review your operation will yield massive rewards for your kitchen down the road.

Once you have your system in place, document everything in a centralized master logbook or within your digital operating platform. Record the date, the instrument identifier, the initial reading, any corrective actions taken, and the initials of the verifying employee. When a health inspector sees an organized, comprehensive calibration history that extends far beyond standard handheld probes, it signals a top-tier culture of food safety excellence. Risk Nothing.

Refrigeration Tips to Keep Your Food Safe

A refrigerator is one of the most important pieces of kitchen equipment for keeping foods safe. In a food service environment, our existence depends on the cooling equipment. The science of refrigeration has evolved from prehistoric times when man found his wild game would last longer packed in the coolness of a cave or packed in snow. Our ancestors harvested ice to keep food cold. Now, if the power goes off, we are instantly reminded of the refrigerator’s importance to our daily life, at home and certainly in a food service facility.

Food Service Hand Hygiene: Basic Handwashing – Part II

Ignoring handwashing as a priority is easy until faced with a crippling lawsuit. Your risk of transmitting a foodborne disease via a food workers hands will never be zero, but the good news is training your crew about handwashing is not complicated. Molding behavior to do it at the right time, using the correct method is the tough part. The Centers for Disease Control & Prevention says the single most effective way to stop the spread of infection is through handwashing. Last month’s article was on the physical equipment to help get better handwashing compliance. The most important part is the practice of the basic handwashing steps:

The Physical Elements of Food Service Hand Hygiene – Part I

September is National Food Safety Education Month and the theme has a rhyme to it – “Keep Hands Clean with Good Hygiene”. Hand washing is one of the public’s best defenses against the spread of both common and rare, even life-threatening, diseases including those caused by food, and against gastrointestinal infections caused by such organisms as the Norovirus, which plagues the cruise ship industry and food service in general.

The Incredible, Edible Egg Safety Quiz

This nutritious, delicate food is a part of many food service menus as a main course and one of the most common ingredients. The U.S. Dept. of Agriculture says Americans consume an average of 234 eggs per person per year. Eggs have also been the source of some significant foodborne outbreaks in the U.S. from one specific type of Salmonella. While eggs are an important source of protein in the diet, an estimated 1 in 20,000 eggs in the U.S. supply will contain the SE (Salmonella Enteritidis) bacteria and can cause illness if eaten raw in foods or not thoroughly cooked before consumption.