3 Flashcards
Major contributors to foodborne illness
- Improper holding temperatures 37%
- Poor personal hygiene and improper handwashing 19%
- Contaminated equipment 16%
- Inadequate cooking 11%
- Food from unsafe sources 6%
- Other 11%
temperature abuse
β’ Exposed to temperatures in the temperature danger zone
β’ Not cooked or reheated sufficiently
Thermometers, thermo-couples
π«
measure temperature of stored, cooked, cooling, hot-heldβ¦
food temperature-measuring device with small diameter probe
thin foods, such as: meat patties, fish filets
(Thermometer) Dial-face, metal stem
Most common type of thermometer used
type (bi-metallic)
- measure internal food temperature at every stage
in the flow of food - Measures temperatures ranging from 0β (-18β) to
220β (104β) with 2β increments - Stem of bi-metallic thermometer must be inserted at least
2 inches into the food item being measured
Digital
- Displays temperature numerically
- Measures wider range of temperatures
Thermocouple
- digital readout of temperature
- interchangeable probes
- Sensing portion is often at the tip of the probe
Infrared
- surface temperature of food without touching the food
- 20 minutes to adjust after use for hot and cold temperatures (βThermal shockβ) before use
- Accuracy must be checked frequently
T-Sticks (melt devices)
- Measure only one temperature
- Change color when indicated temperature is reached
- Used to monitor food temperatures and sanitizing temperature in dishwashing machines
Maximum Registering (holding)
- temperature of hot water used to
sanitize items in mechanical warewashing machines
Before you use a thermometer
calibrate it or make sure it is working correctly.
Calibrate means to
compare and adjust with a known standard.
Dial-face metal stem type (bi-metal thermometers should calibrated
β’ Before first use
β’ regular intervals
β’ If dropped or otherwise damaged
β’ If used to measure extreme temperatures
β’ Whenever accuracy is in question
Boiling Point Method
2 inches of stem from the tip (the sensing part of the probe) into
boiling water and adjust the needle to 212β (100β).
Ice Point Method
Insert probe into a cup of crushed ice.
Add enough cold water to remove any air pockets that might remain.
Wait until the temperature stabilizes and adjust the needle to 32β (0β).
Measuring Food Temperature
- sensing portion of a food
- thermometer is at the end of the stem of probe.
On the bi-metal thermometer
- tip to the βdimpleβ mark that is typically 1 inch up to the stem.
- The stem or probe to make good contact with the packaging.
- The sensing portion for digital and thermocouple thermometers is closer to the tip of the probe.
Accurate readings are only possible when
- temperature-measuring device is inserted deeply into the food.
For bi-metal thermometers,
immerse the needle tip at least 2 inches into the food to be measured.
For digital and thermocouple thermometers,
the tip must be inserted 1 inch or more. Always insert the sensing element of the thermometer into the center or thickest part of the food. When possible stir the food before measuring the temperature.
The approximate temperature of packaged foods
measured accurately without opening the package. Place the stem or probe of the thermometer between two packages of food or fold the package around the stem or probe to make good contact with the packaging.
How to Accurately and Safely Measure Food Temperatures:
β’ Use an approved temperature measuring device that measures temperatures from
0β (β18β) π‘π 220β (104β).
β’ Locate the sensing portion of the measuring device
β’ Calibrate the measuring device using the ice or boiling point method
β’ Clean and sanitize the probe of the temperature-measuring device according to
procedure
β’ Measure the internal temperature of the food by inserting the probe into the center or
thickest part of the item at least 2 inches for a dial thermometer and 1 inch for digital
thermometers
β’ Always wait for the temperature reading to stabilize.
Frozen foods should be
kept solidly frozen until they are ready to be used.
Freezing helps to retain product quality.
Proper frozen food temperatures do not permit disease-causing and spoilage microorganisms to grow.
Cold temperatures preserve the color and flavor characteristics.
Frozen foods can be stored
for long periods of time without losing their wholesomeness and quality.