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system typically found in medical- or pharmacological-grade units such as those from Revco, Thermo Fisher Scientific, Aegis Scientific and similar brands. These are ideal for monitoring if the cooling unit has an internal problem such as door left ajar, compressor or fan failure or other internal diagnostic issues. Second, monitor the temperature independently of the built-in system. If the cooling unit fails to trip the alarm output, the moni- toring system can still record and monitor temperatures, thus preventing any loss when a cooling unit fails to trip its alarm output. The last precau- tion and simple measure to take to prevent vaccine loss is to monitor the power at each freezer’s outlet with a power-out sensor. If a breaker trips and power is lost at the cooling unit, monitoring the power will provide ample enough time to take corrective action rather than waiting until the vaccine temperature limits are at a crucial point.
Most medical-grade refrigerators have access ports to allow for third- party temperature probes, which is best practice. However, users can drill a hole in the side, insert the probe and then seal the hole, or simply place the probe in the refrigerator and run the wire through the door opening. The gasket around the door should make a strong enough seal around the wire to keep the outside air from seeping in.
Figure 2 – Ultralow-temperature sensor (Sensaphone, Aston, Penn.).
Thermometers vs sensors vs probes There are different methods with which to measure temperature inside a refrigerator or freezer. Thermometers are the most basic. Sensor probes
(see Figure 2) detect or measure temperature or other physical properties, and are wired or connected wirelessly to a more intelligent device that
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