202D-M-V3.1
Operation
14
3.7 NON-LINEARITY CORRECTION
Non-linearity correction enables the instrument to correct for known non-
linearities in the flowmeter.
Up to 10 frequencies and scaling factors can be programmed. Data on
the flowmeter non-linearity can usually be supplied by the flowmeter
manufacturer in the form of a Calibration Certificate, and is the result of
individual tests on a flowmeter over a range of flowrates. The
Certificate will list a number of flowrates or frequencies with the
measured K-factor (e.g. pulses per gallon or litre) at each flowrate.
The following diagram graphs the change in scaling factor with frequency for
a hypothetical flowmeter. The heavy black line represents the actual scaling
factor of the flowmeter as read from the Calibration Certificate, while the
light black line is the approximation used in the instrument.
Linear Interpolation is used between points on the curve, except for
Factor 1 which maintains a constant value between Frequency 1 and any
Frequency below Frequency 1.
Note that the display update time will be increased to 1 second when the non
linear correction option is selected with the battery powered version of the
202D.
Sc ali ng
Fa ct 1
Fa ct 2
Fa ct 3
Fa ct 4
Fa ct 5
Fr equ enc y
Fr eq 1 F re q 2 Fr eq 3 Fr eq 4 Fr eq 5
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