ES749 Flow Computer
64
6.8
FLOW INPUT
(Continued)
FLOW INPUT
With many owmeters, the relationship between the owrate and the
output signal may deviate from an ideal curve (linear or squared).
The ow computer is able to compensate for this documented
deviation using a linearization table.
The appearance of the linearization table will vary depending on
particular owmeter selected.
Linear owmeters 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 owmeters with analog output (excluding Gilo, ILVA)
The linearization table enables up to 16 different owrate &
correction factor pairs. The owrate and corresponding correction
factor are prompted for each pair of values. The correction factor (C
f
)
is determined as follows.
C
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 owmeters with analog output)
Enter ow 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
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