2-51
1010PVNFM-3A
Section 2
To enter the Kc Factor:
To enable numeric entry press .
Use the numeric keys to type the required Kc (as calculated above). Note that the Kc
value can be negative or positive. Enter the - or + sign first, then type in the calibrated
value.
To store the data press . Note that Kc now appears in the right-hand column of the
[Calibrate Flow Rate] menu cell with the new value. Also note that this can be viewed
on the site printout.
Calibration Tables 1 through 3
System 1010PVN instruments offer a unique methodology by which a particular flow response
of an instrument may be linearized or optimized by tabulating the results of a series of calibra-
tion exercises or collected batch data points. In essence, the meter allows the user to select
any of a wide variety of system variables (flowrate, pressure, viscosity, etc.) as a pointer into a
table of calibration factors (up to 32). As the system variable is updated, the value of the table’s
output factors (or positive and negative flow) is re-evaluated and used as a modifier for the
current rate register. Note that the flow register is still zeroed and Reynolds number compen-
sated normally and these slope corrections are in addition to these fundamentals.
NOTE: Kc is still active when this facility is being used.
To install a Calibration Table, proceed as follows:
1. The user selects a system variable that appears to correlate strongly with calibration
shifts observed.
2. A table of values is formed comprised of the values that this index could assume over the
range of system operation. Remember, the tables created do not extrapolate beyond their
end points, they ”clip.”
3. A calibration factor, a number usually close to 1.00, is entered as a positive and a negative
flowrate correction factor (termed PosFlow Corr and NegFlow Corr) for each of the desired
index points.
The table may contain up to 32 pairs of these slope correction factors. Note that the Kc factor,
unlike these slope correction factors, is entered as a signed percent change in rate, while
these factors are simply rate multipliers. As points are entered, the point editor will provide
list access to the already entered points plus access to the [New Point] menu cell, used to add
a new point. The table may be created in its entirety and then activated by selecting [Yes] in
the [Table Active] menu cell. The entire table may be cleared by selecting [Yes] in the [Clear
Table] menu cell.
Note that the meter allows you to use [Aux] as an [Index Variable] input. Effectively you may
slope modulate the meter’s output based on the value of a 4 - 20 mA input signal. Also notable,
the interaction between the Liquid Table, described elsewhere in this manual, and the cali-
bration table(s) is extremely powerful.
ENT
To Next Page
Loading...
