Loop Leader PD6620 Series Loop-Powered Rate/Totalizer Instruction Manual
40
Signal Input Conditioning Functions (
FUNCTION
)
The
Function
menu is used to select the signal input conditioner applied to the input: linear, square root,
or programmable exponent calculation. Multi-point linearization is part of the linear function selection.
Meters are set up at the factory for linear function with 2-point linearization. The linear function provides a
display that is linear with respect to the input signal.
Square Root Linearization (
SQROOT
)
The square root function can be used to linearize the signal from a differential pressure transmitter and
display flow rate in engineering units.
Programmable Exponent Linearization (
EXPONENT
)
The programmable exponent can be used to linearize the signal from level transmitters in open-channel
flow applications using weirs and flumes.
Multi-Point Linearization (
LINEAR
)
Meters are set up at the factory for linear function with 2-point linearization. Up to 32 linearization points
can be selected for the scaled value under the linear function. Multi-point linearization can be used to line-
arize the display for non-linear signals to convert level to flow using weirs and flumes with complex expo-
nent.
Advanced Total and Grand Total Programming (
ADV TOTAL
&
ADV GTOTAL
)
The advanced total and grand total menu contain the count (
COUNT
) and reset (
RESET
) menus. The
count menu allows the digit limit to be selected between 8-digit (bottom line only) and 13-digit (uses top
and bottom line to display full number) and an initial value at which the total or grand total should begin
counting to be set.
When using a 13-digit total or grand total, press the function key assigned to display (default: F1) to view
the full amount once the value has exceeded 100,000,000 (decimal places are automatically truncated). If
a 13-digit total or grand total is displayed on the bottom line and the value has exceeded eight digits, the
truncated value will flash to indicate that it is not the complete value. To display 13-digit grand total, as-
signed the top and bottom line to grand total.
The reset menu allows the resetting of total or grand total to zero to be enabled or disabled.
Non-Resettable Grand Total
The grand total reset may be permanently disabled by selecting
YES
at the
PERMLOCK
menu after disa-
bling grand total reset.
Use caution
when selecting the
PERMLOCK
feature as, once grand total reset has
been permanently locked, it cannot be unlocked.
