Kitchen Equipment Calibration Checklist

Open the equipment calibration binder and review the last quarter's readings. Flag any units that drifted last cycle — they often drift again. Quarterly cadence is the minimum most health departments expect to see documented.

Your reference thermometer is only useful if it is itself in calibration. Check the NIST traceability cert on the bimetal or thermocouple probe. Most reference units need annual recertification — out-of-date certs invalidate every reading you take today.

Run calibration before service or on a closed day. Cooking stations need to be cold-started for accurate readings, so coordinate with the chef de cuisine on prep timing — losing prep time mid-day is a common reason cooks skip calibration steps.

Preheat to 350°F empty and let the oven cycle three times before taking a reading. A single reading at first ding will be wrong — convection ovens overshoot, deck ovens undershoot.

Take readings at top, center, and bottom racks. A 25°F+ spread between racks means the convection fan or heating element is failing — that's a service call, not a calibration adjustment. Note the spread for the maintenance log.

Acceptable tolerance is ±10°F at set point. Minor drift can be corrected via the thermostat trim screw per the manufacturer's manual. Drift over 15°F or uneven heating between racks needs a tech, not a trim screw.

Read the calibrated probe placed mid-height between the door and back wall — not the controller display, which is often off by several degrees. Cold-holding requires 41°F or below per the FDA Food Code.

If the air reads above 41°F, probe the product itself — air can fluctuate during door openings while product stays cold. Sustained product temperature above 41°F is a TCS violation and the food must be moved.

Prep-table wells are the most common cold-holding failure point — gaskets degrade and lids stay open during service. Log each unit separately on the temperature sheet.

Run a dollar bill along the closed gasket — if it slides out easily, the seal is compromised. Heavy frost on the evaporator coil or ceiling means the unit is icing and losing efficiency.

Use a 100g or 500g class M calibration weight, not a bag of flour. Scale drift on portioning stations is a direct hit to food cost — a 5% under-portion on a $4 protein adds $0.20 of giveaway per cover.

The receiving scale is what catches Sysco or US Foods short-weighted cases. Drift here means short cases get accepted and food cost variance shows up later with no audit trail.

Plastic measuring cups warp in the dish pit. Compare every cup in active rotation against a glass graduated cylinder; replace any that read more than 5% off. Especially important on the bar — pour-cost discipline depends on accurate jiggers and measures.

Carbon buildup insulates the surface and skews readings cold. Scrape, deglaze, and wipe dry before placing the surface thermometer. A dirty griddle will always read low at the burnt zones.

Take readings at nine points — corners, edges, and center. A 50°F+ spread across the surface means cooks are getting different results depending on where they place the protein, which shows up as inconsistent doneness on the line.

If the zones are wildly uneven, the burner orifices may be partially blocked. Cleaning them is straightforward; replacing them is a tech call.

Filter the oil first — particulate skews readings and accelerates breakdown. Set thermostat to 350°F and probe at the basket level. Drift of ±15°F on a fryer is a service call; the high-limit switch may also need replacement.

Drop a frozen test basket and time the recovery back to set point. Slow recovery (over 90 seconds for a half-size load) means the burners or heating elements are weakening, which translates to soggy fries during the rush.

Drift on the cook timer is a hidden cause of inconsistent fry color. Test each preset against a stopwatch over a full cycle; replace timer modules that drift more than two seconds per minute.

Hot-holding requires 140°F or above per the FDA Food Code. Probe each well at the center of a half-pan of water at simulated service depth. Wells that can't hold 140°F drop into the danger zone within an hour of service.

A failed gasket vents steam, drops cavity temperature, and extends cook times. Look for visible cracks, hardening, or steam tracks along the seal. Gaskets are a cheap, common replacement part.

Pressure steamers are a regulated piece of equipment in many jurisdictions and a safety-critical reading. A stuck or inaccurate gauge is an immediate service call — do not bypass.

Time- and temperature-controlled-for-safety items above 41°F for more than 4 hours must be discarded. Pull dairy, raw protein, cut produce, and prepped salads first. Log the time of transfer for the health-department record.

Open a ticket with the service vendor on record (typically the original installer or the local hood-and-equipment shop). Reference the unit's serial number and attach the calibration variance reading. Do not put the unit back in service until cleared.

The signed log is what an inspector wants to see on a health-department visit. Photograph any units that needed adjustment alongside the reading, and capture any variance notes the chef should know going into next quarter.