Measuring temperatures.
نویسندگان
چکیده
Probably the most common approach in the industry, particularly for frozen blocks, is to drill and probe. This doesn’t really measure “freeze time”, but it does tell the operator what the approximate core temperature is at the end of the freezing cycle. “Temperature Measurement and Fish”, the Torry Advisory Note of J.Graham (1977), gives a good account of these practices. The procedure for drill-and-probe is this: Remove the frozen product from the freezer or cold store and immediately drill a deep (4 inches or more) small-diameter hole only slightly larger than the diameter of your temperature sensor. If the active part of the sensor is right at its tip, and if it contacts the bottom of the hole long enough for everything to equilibrate (maybe a minute or so), then you can expect to measure temperatures within 1 °F of the true core temperature. However if done wrong, errors can reach 35 °F (Graham, 1977; Johnston et al 1994). Our own demonstrations with frozen surimi blocks have found that temperatures can easily vary from “right-on” to 10-12 °F too high.
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ورودعنوان ژورنال:
- BMJ
دوره 304 6838 شماره
صفحات -
تاریخ انتشار 1992