Laurel Electronics Laureate Rate Meter & Totalizer with Functions A+B, A-B, AxB, A_B, A_B-1 - 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™ Rate Meter & Totalizer with
Functions A+B, A-B, AxB, A/B, A/B-1
Features
• Arithmetic functions A+B, A-B, AxB, A/B, A/B-1 applied to rate or total for
channels A & B
• Frequencies from 0.005 Hz to 10 kHz
• Independent scaling for each channel
• Selectable "count by" of 10 or 100 with rounding
• 6-digit red or green LED display
• Universal AC power Input, 85-264 Vac
• Isolated 5, 10 or 24 Vdc excitation output
• NEMA 4X, 1/8 DIN case
• Optional serial I/O: Ethernet, USB, RS232, RS485, Ethernet-to-RS485 converter
• Optional relay outputs: 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
Arithmetic functions A+B, A-B, AxB, A/B, A/B-1 applied to
channels A & B are a capability of Laureates with an Extended
counter main board and FR dual-channel signal conditioner
board. These function are applicable to rate or total after scaling
to engineering units. The following are application examples:
• Add two flows (A+B) for total flow or total volume.
• Subtract two flows (A-B) for net flow or net volume.
• Take the ratio of two flow rates (A/B) for chemical mixing.
• Take the ratio of RPMs or belt speeds (A/B) to synchronize
moving machinery.
• Subtract 1 from ratio (A/B-1) to control elongation of material
compressed by rollers (draw).
• Multiply belt speed by weight of material on the belt to for rate
or weight of material delivered by the belt. A weight
transducer with frequency output is required.
Ratio and draw are similar, except that 1 is subtracted from ratio
to obtain draw. The frequency of channels A or B is measured
and converted to rate in engineering units by multiplying it by the
appropriate scale factor for that channel. Either rate can be
displayed. The A/B ratio is taken mathematically by the meter,
and 1 is subtracted for draw. The result can be multiplied by a
multiple or 10 from 0.0001 to 100000, and the decimal point can
be set to display the result with the desired precision up to six
digits.
Fast, High Resolution Measurements. Laureate counters
determine frequency by timing an integral number of periods over
a programmable gate time. The inverse period approach allows
greater accuracy and faster update times than conventional
meters which count signal pulses over a specified time interval.
Channel A accepts pulses from 0.005 Hz to 1 MHz, while Chan-
nel B accepts pulses from 0.005 Hz to 250 kHz. At the minimum
gate time of 10 ms, update rates can be up to 25/second. Such
fast response is ideal for peak capture and for alarm and control
applications. Variations in the displayed reading can be reduced
by selecting a longer gate time. An adaptive digital filter can
further reduce variations due to noise while rapidly responding to
actual changes in the signal.
Universal Signal Conditioner. The Laureate dual-channel
signal conditioner accepts inputs from proximity switches with
PNP or NPN output, TTL or CMOS logic, magnetic pickups,
contact closures, low-level outputs from turbine flow meters down
to 12 mV, or high-level AC line inputs to 250 Vac. Jumper selec-
tions provide optimum operation for different sensor types and
noise conditions. A built-in isolated 5, 10, or 24 Vdc excitation
supply can power proximity switches or other sensors, and
eliminate the need for an external power supply.
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.