| 摘要 |
A centrifugal evaporator comprises a chamber 10 in which sample containers 20, 22 are carried and rotated by a rotor 14 and are pivotally mounted 24, 26 so as to swing up into a horizontal attitude as the rotor 14 rotates. The evaporator includes an infra red source 32 to direct infra red radiation towards the rotor 14 and the sample containers 20, 22 carried thereon, to heat any sample material therein. A non-contact temperature sensing infra red pyrometer 34 having a sensor with a defined field of view is mounted in the chamber 10, such that while the rotor 14 as such is substantially out of its field of view, each sample container 20, 22 at least partly occupies the pyrometer 34 field of view for a part of each rotation of the rotor. The positions of the infrared source 32 and the pyrometer 34 components are selected so that the radiation from the infra red source does not impinge on the pyrometer sensor. In particular the infra red source 32 radiation predominantly impinges on the sample containers 20, 22 rather than the rotor. The position of the pyrometer sensor is chosen so that the rotor 14 does not protrude into the pyrometer field of view. The direction of rotation of the rotor 14 is such that any debris thrown from the rotor is directed away from the sensor. Temperature sensing means 40 measures the temperature of the chamber, the pyrometer sensor body and the body of the chamber temperature sensor. Electrical signal processing means 30 receives signals from the IR pyrometer sensor and the temperature sensing means to adjust the temperature values from the IR pyrometer sensor to take account of the chamber temperature, and sensor body temperature.
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