Laurel Electronics Laureate Digital Panel Meter for Process, Strain & Potentiometer Follower Signals - Manual

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1
LAUREL
ELECTRONICS, INC.
Laureate™ Digital Panel Meter for Process,
Strain & Potentiometer Follower Signals
Features
• Selectable ±0.2, ±2, ±20, ±200, ±300 & ±600 Vdc voltage ranges
• Selectable ±2, ±20, ±200 mA and ±5A dc current ranges
• All ranges factory calibrated
• 99.99% full scale accuracy
• Scalable to ±99,999 for display in engineering units
• Up to 60 conversions per second
• Peak or valley capture & display
• Universal AC power: 85-264 Vac
• Built-in isolated excitation supply: 5, 10 or 24 Vdc
• Ratiometric compensation for variations in excitation voltage
• 1/8 DIN case sealed to NEMA-4X from front panel
• Optional serial I/O: Ethernet, USB, RS232, RS485, Ethernet-to-RS485 converter
• Optional relay output: dual or quad relays, contact or solid state
• Optional isolated analog output: 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
• Optional low voltage power: 10-48 Vdc or 12-32 Vac
Description
Laureate™ digital process and strain panel meters are a cost-
effective solution to monitoring and control applications which
require zero and span adjustment for process signals such as
4-20 mA, 0-5 V, 0-10 V, or strain gauges. The meters are also
suitable for potentiometer follower applications, where the
transducer output is a changing resistance.
The display is scalable to five digits from -99,999 to +99,999
from the front panel to read directly in engineering units, such
as PSI. Three scaling methods are selectable: scale and offset,
two-point method, and system-level calibration using actual
transducer signals. All ranges are precalibrated at the factory, so
that recalibration is not needed when changing ranges or signal
conditioners.
Strain gauges with a 20 mV output can be scaled to display up
to 10,000 counts with a 4-wire ratiometric connection, while 200
mV outputs of can be scaled to display up to 99,999 counts. For
higher sensitivity, 20 mV signals can be scaled to 99,999 counts
with a 4- or 6-wire connection using the Laureate load cell meter.
A high input impedance of 1 Gohm is provided on 200.00 mV
and 2.000 V ranges to minimize the load on the voltage signal.
An isolated 5, 10 or 24 Vdc isolated excitation output is
standard to power external transducers and transmitters. Up to
120 mA is provided at 10V to power four 350 ohm load cells in
parallel. When powering strain gauges, load cells or potentio-
meters, the excitation output is monitored by the meter to
eliminate errors due to voltage variations.
High read rates at up to 60 or 50 conversions per second while
integrating the signal over a full power cycle are provided by
Concurrent Slope (US Pat 5,262,780) analog-to-digital conver-
sion. High read rates are ideal for peak or valley capture, real-
time computer interface, and control.
Peak and valley values are automatically captured. These may
be displayed via a front panel pushbutton command or control
signal at the rear connector, or be transmitted as serial data.
High read rates at up to 60 or 50 conversions per second while
integrating the signal over a full power cycle are provided by
Concurrent Slope (US Pat 5,262,780) analog-to-digital conver-
sion. High read rates are ideal for peak or valley capture, real-
time computer interface, and control. Peak and valley values are
automatically captured. These may be displayed via a front panel
pushbutton command or a control signal at the rear connector, or
be transmitted as serial data.
Digital filtering is selectable for electrically noisy environments,
including a batch averaging filter and an adaptive moving aver-
age filter which provides a choice of 8 time constants from 80 ms
to 9.6 s. When a significant change in signal level occurs, that
filter adapts by briefly switching to the shortest time constant to
follow the change, then reverts back to the selected time con-
stant. In a selectable Auto filter mode, the filter time constant is
automatically selected based on detected signal noise.
Designed for system use. Optional plug-in boards include
Ethernet and other serial communication boards, dual or quad
relay boards, and an isolated analog output board. Laureates
may be powered from 85-264 Vac or optionally from 12-32 Vac
or 10-48 Vdc. The display is available with red or green LEDs.
The 1/8 DIN case meets NEMA 4X (IP65) specifications from the
front when panel mounted. Any setup functions and front panel
keys can be locked out for simplified usage and security. A built-
in isolated 5, 10, or 24 Vdc excitation supply can power trans-
ducers and eliminate the need for an external power supply. All
power and signal connections are via UL / VDE / CSA rated
screw clamp plugs.