LINEARIZATION
Where the flowrate reported by the Compu-M is non-linear due to material characteristics, compensation
may be achieved by using the linearizer function. The Compu-M provides a linearizing function (P24)
in order to correct for the deficiency in the weighting system and to provide an accurate report of the
actual process.
To verify that the cause of the non-linearity is not mechanical:
» Suspend various test weights from the flowmeter to verify mechanical linearity. If the
rate reported by the Compu-M during these tests is non-linear, a mechanical problem
is indicated. Refer to the flowmeter manual in order to resolve the non-linearity
by improved installation or repair.
If it is determined that the non-linearity is due to the metering, and not the actual flowmeter, apply linearization
by performing the following:
» zero calibration
» span calibration at 90 to 100% of design rate
» material tests at 90 to 100% of design rate
» manual span adjust if required
» material tests at 1 to 3 intermediary flow rates where compensation is required.
Compensation points must be at least 10% of the design rate apart.
E8 message occurs if a point is less than 10% of
full scale or if points are less than 10% apart.
» calculate the percentage compensation for each flow rate tested.
% compensation =
actual weight - totalized weight x 100
totalized weight
where: actual weight = material test
totalized weight = Compu-M total
PL-516 50
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