Example
:
A non-linearity with respect to the ideal response exists in a flowmeter application with design rate of 50 t/h.
It is decided to do material tests at 25, 50 and 75% of the design rate. After performing a zero and a span
calibration at 100% of the design rate, followed by material tests and manual span adjust, three material tests
were performed at 12.5, 25 and 37.5 t/h, as indicated by the Compu-M. The following data was tabulated.
(This example is exaggerated for emphasis).
load =
rate
speed
*calculation example: % compensation =
4.2 - 4.9 x 100
4.9
= - 14.3
Compu-M flowrate
t/h
material test
tonnes
Compu-M total
tonnes
compensation*
12.5 4.2 4.9 -14.3
25 8.4 7.6 10.5
37.5 12.6 13.7 -8.0
actual mass per material test
totalized mass by Compu-M
flowmeter response
linearized Compu-M response
% compensation
span (100%)
mass - tonnes
flowrate - tons per hour
PL-516 51