Documentation
Record of equipment calibration is kept under /Dropbox/Akron/Documentation/Calibration and QA/Equipment Calibration Log.Doc
Calibration of Scientech SP404D Balance
Slush Test
The accuracy of a thermometer can be checked using the following test:
- Fill a polystyrene or plastic cup two-thirds full with cold water. Place the cup in the freezer until a fine layer of ice forms on top and a small section of ice forms within the fluid (about 2 hours). If ice is present, this ensures that the mixture is at 0°C (+32°F).
- Place the temperature probe in the middle of the cup (do not touch the sides or bottom).
- Observe the temperature after 2 minutes. The temperature should drop to 0°C (+32°F) within 2 minutes.
Most thermometers are calibrated to be accurate to ±1°C or better. If the temperature reading is more than 1°C (+34°F) above or below 0°C (+32°F) at 2 minutes, replace the battery and test again. If the thermometer is still not within range, contact your thermometer manufacturer for instructions regarding recalibration procedures or replace the thermometer. This test should be done at least once a year.
A less reliable method is to test thermometer accuracy against a reference thermometer. This is not recommended.
If the calibrated thermometer indicates an out-of-range temperature and if it is properly positioned, assume that it is accurate and take immediate steps to safeguard the vaccine. Once the vaccine has been safely stored under proper conditions, the accuracy (and batteries) of the thermometer can be checked. However, always check other causes of inappropriate storage temperatures first.