Laurel Electronics LAUREATE SERIES 2 COUNTER-TIMER-SERIAL INPUT METER - Manual (Page 4)

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3. PRODUCT INTRODUCTION
Our counters are a versatile, cost effective solution to a wide range of monitoring and control
applications including frequency, rate, total, period, time, phase, position, and flow. Setup can
be via front panel pushbuttons or a PC. Selective lockout of front panel keys protects against
accidental or unauthorized setup changes and simplifies meter use.
A dual-channel pulse or AC input signal conditioner board accommodates a wide range of
applications including rate/frequency, totalizing, timing, phase angle, power factor, and duty
cycle. Frequency and rate are determined by taking the inverse of period. Fast read rate is
ideal for peak or valley capture and allows quick response for control applications. Adaptive
digital filtering provides stable readings and control outputs while responding rapidly to actual
changes of the signal. A high stability quartz crystal and digital calibration assure accurate rate
and analog measurements.
A process receiver & totalizer signal conditioner board accepts 4-20 mA, 0-1 mA or 0-10V
analog signals for display of rate or position. Square root extraction is selectable for use with
differential pressure flow transducers.
A quadrature signal conditioner board provides accurate display of position, angle, or rate.
Ethernet USB, RS232, or RS485 (2-wire half-duplex or 4-wire full-duplex) serial communi-
cations options are available with the Modbus protocol or a simpler custom ASCII protocol.
Modbus operation includes RTU or ASCII modes, up to 247 digital addresses, and up to 32
devices per RS485 line without a repeater. Ethernet-to-RS485 and USB-to-RS485 converter
boards allow a meter to be interfaced to a PC and to multiple meters on an RS485 network
Meter programming can be via the meter’s front panel or a PC running Windows based
Instrument Setup Software. A serial interface option is required.
A standard switching power supply allows the meters to be powered worldwide from 85 to
264 Vac. An optional power supply operates from batteries or low voltage sources, such as 12-
32 Vac.
A built-in isolated excitation supply with jumper-selectable 5, 10 or 24 Vdc output levels is
standard and can eliminate the need for an external sensor power supply.
A dual or quad relay board is optional for alarm or control. The relays can be Form C 8A
mechanical relays or 2 or 4 Form A 130 mA solid state relays. The setpoints can be latching or
non-latching, be energized above or below the setpoint, or operate in a fail-safe mode.
A single or dual isolated analog output board is optional. With dual outputs, one of the
outputs can be assigned to the reading (such a rate), while other reading is assigned a non-
displayed item (such as total). The outputs can be 0-20 mA, 4-20 mA, 0-10V, or -10V to +10V.
Operation as a 6-digit serial input meter is achieved with a serial interface and no signal
conditioner board, allowing the unit to serve as the remote display of a computer, PLC or other
meter. With an optional dual or quad relay board, the unit can provide local alarm or On/Off
control. With an optional analog output board, it can also serve as a local isolated transmitter.
The meter case meets the 1/8 DIN size standard and is sealed to NEMA-4X (IP65) when
panel mounted. Mounting is from the front of the panel and requires less than 110 mm behind
the panel. All wiring is via removable plugs conforming to IEC950 safety standards. All output
options are isolated from meter and power grounds to 250 Vac.