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Scale Out (Scale Outputs) Page
Figure 79: Scale outputs setup
The
I/O > Scale Out
sets the parameter to which the output circuitry responds .
Data to Output
Choices for
Data To Output
are
Flow
and
Power
.
Flow at Min Out
Flow at Min Out
sets the minimum value to which the outputs are scaled .
Flow at Max Out
Flow at Max Out
sets the maximum value to which the outputs are scaled .
OTEE:
N
Transit
time measurements are capable of bidirectional flow but
Doppler
is not . The only time that setting the
Flow at Min Out
to a negative value may be necessary is if the meter stays in
Transit
time mode . If the meter is used in
Doppler
mode exclusively, or when in hybrid mode the meter switches to
Doppler
mode, set the value for
Flow at Min Out
no lower than zero .
An example of a valid use of setting
Flow at Min Out
below zero would be a transit time application where flow can be in
either the forward or reverse direction . If, for instance, a tap water system is capable of 100 gpm forward and 100 gpm in
reverse, then setting the
Flow at Min Out
to –100 and
Flow at Max Out
to +100 would be valid entries .
If the meter were programmed to output a 4…20 mA signal, then 4 mA would represent –100 gpm and 20 mA would
rep100 gpm . The zero flow point would be indicated as 12 mA (halfway between 4 mA and 20 mA) .
-100
100
-50
50
0
GPM
4 mA
20 mA
8 mA
16 ma
12 mA
mA
Dead
Band
Figure 80: Bidirectional current output
Because no flow meter can read down to zero, there is going to be a small dead band around true zero where the velocity of
the fluid is not great enough for the meter to register . The absolute minimum, under perfect conditions, is 0 .1 fps (0 .03 mps) .
Whatever flow rates these velocities correspond to create the minimum dead band around true zero .
I/O (Input / Output) Group
Page 61
November 2016
HYB-UM-00090-EN-04