2-50
1010PVNFM-3A
Section 2
Actual Rate
Indicated Rate
-1
Kc Calibration
For most applications, the measured flow range produces a linear meter response. Therefore,
the Kc (slope correction) calibration is the preferred method since it only requires a single
correction factor for all the flow rates encountered.
Data Span/Set/Cal Calibrate Flowrate Intrinsic
Kc x.xxx
Calib. Table 1 Index Variable Flow
Vs
Liquident
Viscosity (cS)
Valc
Vaer
Temp 1
Reynolds #
Pressure
Aux
Calib. Table 1 New Point Cal. Index Value x.xxx
PosFlow Corr x.xxx
NegFlow Corr x.xxx
Accept/Clear Accept Pt.
Clear Pt.
Table Active 1 No
Clear Table 1 No
Yes
Data Span/Set/Cal Menu (Calibration Section)
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NOTE: Changing the calibration can cause profound changes in a flowmeter’s operat-
ing characteristics. Use only the most respected flow standard to obtain a cor-
rection factor. The percentage you enter must provide an accurate and consis-
tent shift across the entire flow range anticipated for the application.
Kc Factor
To obtain the Kc factor, compare flow total data taken simultaneously from the 1010 and a
reference meter whose accuracy meets the required standard. Allow both meters to accumu-
late flow total data long enough to average out any differences due to flow fluctuation between
the two meter locations. Compare outputs of the two totalizers to determine percentage in-
crease (+) or decrease (-) that is necessary to produce the best average correlation between
System 1010 and the reference standard.
Selecting the Kc Factor
When the [Kc] menu cell is selected, the meter imposes this % slope adjustment of its rate
output. Output data is zeroed and corrected for the Reynolds number (flow profile compen-
sated), however, in addition, a percent change in the rate output is imposed based on the data
entered in this cell. The number entered by the user is evaluated into a slope correction factor
by dividing it by 100 and algebraically adding it to 1. The resulting factor is used as a multi-
plier on the rate register of the instrument. Thus an entry of -3% will multiply the rate regis-
ter by 0.97, for example.
To calculate Kc:
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