Liquid Controls SP4000 - Manual (Page 69)

66
SP4000 Flow Computer
6.8
FLOW INPUT
(Continued)
FLOW INPUT
With many flowmeters, the relationship between the flowrate and the
output signal may deviate from an ideal curve (linear or squared).
The flow computer is able to compensate for this documented
deviation using a linearization table.
The appearance of the linearization table will vary depending on
particular flowmeter selected.
Linear flowmeters with pulse output
The linearization table enables up to 16 different frequency & K-factor
pairs. The frequency and corresponding K-factor are prompted for
each pair of values. Pairs are entered in ascending order by frequency.
Linear Flowmeters with pulse outputs and a UVC Curve:
The linearization table enables up to 16 different Hz/cstks and K-
Factor points. The Hz/cstks and corresponding K-Factors are
prompted for each pair of values. Pairs are entered in ascending
order by Hz/cstks.
Linear flowmeters with analog output
The linearization table enables up to 16 different flowrate &
correction factor pairs. The flowrate and corresponding correction
factor are prompted for each pair of values. The correction factor (k
f
)
is determined as follows.
K
f
=
actual flowrate
displayed flowrate
Linear/squared DP transmitters with analog output
The linearization table enables up to 16 different Reynold's Number
an DP factor pairs. The Reynold's Number and corresponding DP
factor are prompted for each pair of values.
Selection:
CHANGE TABLE? NO
CHANGE TABLE? YES
If "YES" the linearization table sequence of prompts will
begin.
Example (for linear flowmeters with analog output)
Enter flow rate:
FLOW ft3/h 3.60
POINT 0
Entry of corresponding correction factor:
COR.FACTOR 1.0000
POINT 0
Note:
Enter "0" for the value of a pair (other than point 0) to exit the
linearization table routine and use the values stored up to that point.
LINEARIZATION