Introduction
III
INTRODUCTION
LD301 is a smart pressure transmitter for differential, absolute, gauge, level and flow
measurements. It is based on a field-proven capacitive sensor that provides reliable operation and
high performance. The digital technology used in LD301 enables the choice of several types of
transfer functions, an easy interface between the field and the control room and several interesting
features that considerably reduce installation, operation and maintenance costs.
Besides all the functions offered by other smart transmitters, LD301offers the following functions:
3
)( P - used for trapezoidal weirs in open channel flow measurement.
5
)( P - used for V-notch weirs in open channel flow measurement.
TABLE - the pressure signal is linearly customized according to a 16-point table, enabling, e.g.,
level-to-volume conversion of a horizontal cylindrical tank.
CONTROLLER - the Process Variable is compared to a set point. The deviation acts on the
output signal according to an optional PID algorithm.
PID OUTPUT CHARACTERIZATION - the PID output signal (MV) follows a curve that is
determined by 16 points, which can be freely configured
BIDIRECTIONAL FLOW FUNCTION - used to measure the flow in the piping in both directions.
LOCAL ADJUSTMENT - not Only for Lower and Upper value, but input/output function,
operation mode, indication, set point, PID parameters (optional) as well.
PASSWORD - three levels for different functions.
OPERATION COUNTER - shows the number of changes in each function.
TOTALIZATION - flow totalization in volume or mass.
USER-UNIT - indication in engineering unit of the property actually measured, e.g., level,
flow or volume.
WRITE-PROTECT - via hardware
Get the best results of the LD301 by carefully reading these instructions.
Smar pressure transmitters are protected by U.S. patents 6,433,791 and 6,621,443.
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