Thermoworks HAXO-8 LOGTAG TRANSIT RECORDERS User Manual Uživatelský manuál stáhnout pdf (Strana 162)

160 LogTag Analyzer User Guide (1.9)

Sensor Responsiveness

Temperature sensors typically respond to changes in the environment temperature in a

logarithmic way and as such you will find that the responsiveness of temperature sensors

(how quickly a sensor responds to an environmental temperature change) is expressed in

terms of T90. T90 represents the time it takes for a logger to respond to 90% of the

actual change of the environmental temperature.

For example, if the actual environment temperature suddenly changed from 15° to 45°

and the T90 of the sensor was 30 minutes, then 30 minutes after this sudden change the

sensor would be reading (15 + (45 - 15) * 0.90) 42°. In reality, it is rare for the

temperature of an environment to suddenly change to a very different temperature and

then suddenly change again, usually it is a gradual incremental process.

For example, if the actual environment temperature changed from 15° to 45° over a

period of 5 hours in a linear fashion, that is after 2 hours the temperature was 27° and

after 4 hours the temperature was 39°, and the T90 of the sensor was 30 minutes, then

when after 5 hours of this temperature change, that is the actual environment

temperature was 45°, the sensor would be reading 44.7°.

LogTag products are designed to produce rapid response to environmental changes. For

example, the Trix-8 model achieves a rapid response to temperature changes because the

actual sensor element is external to the logger body itself. The T90 of the LogTag Trix-8

is typically less than 5 minutes in moving air, which is very responsive as some internal

sensor temperature recorders can take up to an hour for the T90 of the temperature

change to be recorded.

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Thermoworks HAXO-8 LOGTAG TRANSIT RECORDERS User Manual Uživatelský manuál Strana 162