DataLoop™ LI23 Loop-Powered Process Meter
Instruction Manual
MN302100 Rev 3
37
Advanced Process Variable Setup (
ADV PV SETUP
)
The Advanced PV Setup menu contains options to apply signal input conditioning functions to the input
and scale/calibrate the input signal.
Signal Input Conditioning Functions (
FUNCTION
)
The
Function
menu is used to select the signal input conditioner applied to the input: linear, square root,
programmable exponent, or round horizontal tank volume 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 PV1 and PV2 under the linear function. Multi-point linearization can be used to linear-
ize 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.
If the dual-scale level feature has been selected, the menus for PV1 & PV2 are enabled.
Round Horizontal Tank Linearization (
RH TANK
)
This function automatically calculates the volume in a round horizontal tank with flat ends. It is only avail-
able for PV2 while the meter is in dual-scale mode.
Set the display for the desired decimal point and engineering units before entering the round horizontal
tank function. Select units (inches or cm) for the tank dimensions. Enter the diameter and the length in
inches or cm and the results will be calculated automatically in US gallons or liters. The unit of measure
for the volume can be changed using the display menu. See Changing the Units (
UNITS
) on page 21 and
Available Unit Classes and Units on page 20 for a list of available volume units. There is no need to enter
scaling values.
Advanced Scaling and Calibration (
SCALE.CAL
)
This menu offers options to scale or calibrate the meter.
Scaling the Input (
SCALE
)
The scale menu in the
Advanced
menu is the same as the scale menu in the
Input
menu. See
ADV
PV SETUP
PV
FUNCTION
PV
SCALE.CAL
FUNCT
LINEAR
FUNCT
SQROOT
FUNCT
EXPONENT
FUNCT
RH TANK
*Available for
PV2 only.
*
SCALE
PV
CAL
PV
