The dry solids flow meter uses the impact of measuring through flow of material. The material impacts a sensing plate and, in turn, pushes on a load cell or linear variable differential transformer (LVDT). From the output of load on the load cell or LVDT you get a rate of flow. This could be in tons per hour or pounds per hour. Because it is measuring the impact force, the bulk density should remain within +/-1 lb. per cubic foot (PCF). As a result, it is essential to conduct material tests to ensure that it doesn’t negatively affect the impact on the plate.
What sort of scenarios can affect the impact on the plate?
From my experience, there are primarily six scenarios that can affect the impact on the plate.
With all of these scenarios, you can see how any one of these changes can affect the rate outcome.
This is why simply hanging a test weight on the dry solids flow meter cannot cover all six of these scenarios in the factory.
Finally, the best way to test the flow meter is to run multiple material tests. Once you are satisfied with the outcome of your tests, you can hang the test weight to see what that weight represents and use that number to keep the unit calibrated.
How do you ensure your dry solids flow measurements are accurate?