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Description:
The Temperature control unit employs a
PID (Proportional, Integral and Derivative) control algorithm
using high resolution feedback from a thermistor temperature
probe. The algorithm takes into account the current temperature
error as well as how the system has reacted previously in order to
predict the power required to maintain constant temperature. The
temperature is held stable to better than 0.1 Celsius at the point
of measurement.
Up to 300W of 'clean' power is
supplied to heat the test chamber quickly when the unit is
switched on. This power varied as an analogue output to ensure
low system noise and excellent temperature control.
The unit also incorporates a second
thermistor as a high precision 'hand held' temperature probe
(Model 745CTP). The probe is designed to give a high resolution
and accurate temperature measurement. It can be inserted into an
individual slice chamber to provide an accurate indication of the
temperature, facilitating the determination of the temperature
offset between the heated bath and the chambers. The 745CTP probe
can also be used to provide accurate temperature readings in the
holding chamber.
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