PD8-6262 Explosion-Proof Dual Analog Input Flow Rate/Totalizer
Instruction Manual
56
Multi-Point Linearization (
Linear
)
Totalizers are set up at the factory for linear function
with 2-point linearization. Up to 32 linearization points
can be selected for each channel under the linear
function. The multi-point linearization can be used to
linearize the display for non-linear signals such as
those from level transmitters used to measure volume
in odd-shaped tanks or to convert level to flow using
weirs and flumes with complex exponent.
Note:
After Scale is displayed continue pressing the Enter
button until the totalizer completes the scaling of the input
and display values.
Math Function (
nmath
)
The
Math
menu is used to select the math function
that will determine the channel C value. These math
functions are a combination of input channels A and
B, and will display when channel C is selected in the
Display
menu.
A and B refer to the rate of channel A and B. tA and
tB refer to the totals of channel A and B. GtA and GtB
refer to the grand totals of channel A and B. The
following math functions are available.
Function
Display
Description
Sunm
Sum
C = (A+B+P)*F
Dif
Difference
C = (A-B+P)*F
difabs
Absolute
difference
C = ((Absolute value of
(A-B))+P)*F
AVg
Average
C = (((A+B)/2)+P)*F
nmulti
Multiplication
C = ((A*B)+P)*F
DiVide
Divide
C = ((A/B)+P)*F
Hi-ab
Max of A or B
C = ((High value of
channel A or B)+P)*F
Lo-ab
Min of A or B
C = ((Low value of
channel A or B)+P)*F
Drauw
Draw
C = ((A/B)-1)*F
uw Avg
Weighted avg.
C = ((B-A)*F)+A
ratio
Ratio
C = (A/B)*F
Ratio2
Ratio 2
C = ((B-A)/A)+P*F
Concen
Concentration
C = (A/(A+B))*F
Sunm t
Sum total
C = (tA+tB+P)*F
Sunmgt
Sum grand total
C = (GtA+GtB+P)*F
Dif t
Difference of
total
C = (tA-tB+P)*F
Dif gt
Diff. of grand
total
C = (GtA-GtB+P)*F
Tratio
Total ratio
C = (tA/tB)*F
t-rat2
Total ratio 2
C = ((tB-tA)/tA)*F
T pct
Total percent
C = (tA/(tA+tB))*100
Math Constants (
Const
)
The
Math Constants
menu is used to set the
constants used in channel C math. The math
functions include adder constant P, and factor
constant F.
The
Adder
constant (P) may be set from -99.999 to
999.999.
The
Factor
constant (F) may be set from 0.001 to
999.999.
The chart on page 56 details the math functions that
may be selected in the
Math Function
menu.
Low-Flow Cutoff (
CutofF
)
The low-flow cutoff feature allows the totalizer to be
programmed so that the often-unsteady output from a
differential pressure transmitter, at low flow rates,
always displays zero on the totalizer. The low-flow
cutoff for each channel is programmed independently.
The cutoff can be disabled to display negative values.
The cutoff value may be programmed from 0.1 to
999999. The totalizer will display zero below the cutoff
value. Programming the cutoff value to zero disables
the cutoff feature. The cutoff can be disabled to
display negative values.
