Device and method for determining material moisture by thermogravimetry
A device and a method for determining material moisture by thermogravimetry. Included in the device are: a test chamber ( 2 ) delimited by a chamber cover ( 8 ); a microwave field that can be generated by a magnetron ( 5 ) and supplied to the test chamber by a waveguide ( 4 ); a tuning rod ( 22 ) arranged in the test chamber; a sample carrier ( 3 ) which is operatively connected to a weighing module ( 6 ) mounted upstream of the test chamber; and at least one sensor ( 24 ) arranged in the test chamber. The tuning rod is arranged centrally on the chamber cover, above the sample carrier, and the at least one sensor is arranged on the free end of the tuning rod, opposing the chamber cover.
1. A device for determining material moisture by thermogravimetry, comprising:
a test chamber delimited by a chamber cover,
a magnetron generating a microwave field
a waveguide supplying the microwave field to the test chamber,
a tuning rod arranged in the test chamber,
a sample carrier in operative connection with a weighing module mounted upstream of the test chamber, and
at least one sensor arranged in the test chamber,
wherein the tuning rod is arranged at the chamber cover centrally above the sample carrier and wherein the sensor is arranged at a free end of the tuning rod distal from the chamber cover.
2. The device according to claim 1 , wherein the sensor is configured as a microwave sensor, as an air moisture sensor or as a non-contacting temperature sensor.
3. The device according to claim 2 , wherein a second sensor is arranged in the test chamber.
4. The device according to claim 3 , wherein the second sensor is configured as a non-contacting temperature sensor or as a microwave sensor.
5. The device according to claim 2 , wherein the sensor is a temperature sensor configured as an infrared sensor.
6. The device according to claim 1 , wherein the waveguide is fixed, wherein the sample carrier is configured to rotate about a rotation axis via which the sample carrier is connected to the weighing module, and wherein exhaust air apertures are provided in the chamber cover, via which an exhaust air stream generated by at least one ventilator is conducted out of the test chamber.
7. The device according to claim 6 , further comprising an air moisture sensor in the exhaust air stream.
8. The device according to claim 1 , further comprising a temperature sensor at the magnetron.