Powdery-material measurement device and method of checking or calibrating properties of sensor probe

A powdery-material measurement device configured to measure characteristics of mixed-powdery materials obtained by mixing two or more types of powdery materials and then deliver the mixed-powdery materials toward an equipment configured to execute a post process using the mixed-powdery materials, the powdery-material measurement device comprising:

• a sensor probe configured to receive reflected light from the mixed-powdery materials passing adjacent thereto or transmitted light through the mixed-powdery materials to measure the characteristics of the mixed-powdery materials while the powdery-material measurement device is in operation to deliver the mixed-powdery materials toward the equipment;
• and
• a standard sample having known characteristics and rotatably movable to face the sensor probe that is disposed to receive the reflected light from the standard sample or the transmitted light through the standard sample, when the mixed-powdery materials are not present adjacent the sensor probe while the powdery-material measurement device is in operation to deliver the mixed-powdery materials toward the equipment;
• and
• a movable member configured to move to pass by the sensor probe,
• wherein the movable member includes a portion facing the sensor probe and including the standard sample buried and enclosed in the movable member.