Measuring instrument and method for the measuring of properties of a particulate sample

1. A measuring instrument for measuring properties of a sample with a multitude of particles, comprising:

a spectroscopy device for measuring spectroscopic properties of the sample, wherein a sample chamber is provided, in which the sample can be arranged in the spectroscopy device and which has a predetermined volume, which cannot be changed for measuring the sample, and

a weighing device for measuring a mass of the sample, wherein

the spectroscopy device and the weighing device are arranged such that the sample is completely transferable from the sample chamber to the weighing device, such that the mass of the sample can be measured, which fills the sample chamber of the spectroscopy device, and

an evaluation device is provided to determine a mass density of the sample from the measured mass and the volume of the sample chamber.

2. The measuring instrument according to claim 1 , wherein a transport wheel is provided, to transport the sample into a light path of the spectroscopy device and from the spectroscopy device to a sample holder of the weighing device.

3. The measuring instrument according to claim 2 , wherein the weighing device is arranged such that the sample can be moved under an influence of gravity from the transport wheel to the sample holder.

4. The measuring instrument according to claim 3 , wherein:

the transport wheel has several transport chambers, and

the weighing device is configured for weighing of the sample in such a way that successive partial samples are transferred from all filled transport chambers to the sample holder.

5. The measuring instrument according to claim 1 , wherein the weighing device comprises at least one of a lever and a spring balance.

6. The measuring instrument according to claim 1 , wherein the spectroscopy device is set up for measuring at least one of a transmission, an optical density and a reflection of the sample.

7. The measuring instrument according to claim 1 , which is part of a grain transporting device.

8. A method for measurement of properties of a sample with a multitude of particles using the measuring instrument of claim 1 , comprising the steps:

measuring of spectroscopic properties of the sample with the spectroscopy device,

weighing the sample with the weighing device to determine a mass of the sample, and

determining with the evaluation device the mass density of the sample from the mass and the volume of the sample chamber wherein

the sample is completely transferred from the sample chamber of the spectroscopy device to the weighing device.

9. The method according to claim 8 , wherein the sample is transported with a transport wheel into a light path of the spectroscopy device and from the spectroscopy device to a sample holder of the weighing device.

10. The method according to claim 8 , wherein the transport wheel comprises several transport chambers and the weighing of the sample with the weighing device comprises a transfer of at least one partial sample from at least one of the transport chambers to the sample holder.

11. The method according to claim 10 , wherein the weighing of the sample with the weighing device comprises a transfer of partial samples from all filled transport chambers to the sample holder.

12. The method according to claim 9 , wherein the sample is moved under an influence of gravity from the transport wheel to the sample holder.

13. The method according to claim 8 , wherein the measuring of the spectroscopic properties of the sample comprises a measurement of at least one of a transmission of the optical density and of a reflection of the sample.

14. The method according to claim 8 , wherein the sample comprises particle-shaped agricultural products or synthetic particles.

15. The method according to claim 14 , wherein the products are grains.