Standard Features

• Arithmetic functions A+B, A-B, AxB, A/B, A/B-1 applied to rate or total
• Frequencies from 0.005 Hz to 1 MHz
• Independent scaling for each channel
• Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac
• Update rate to 25/s
• Selectable "count by" of 10 or 100 with rounding
• Isolated 5, 10 or 24 Vdc excitation supply to power sensors
• Green or red LED display
• Universal AC power, 85-264 Vac
• External controls for reset, meter hold and decimal points
• NEMA 4X, 1/8 DIN case
• Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), and RoHS
  Options:
• Low voltage power: 10-48 Vdc or 12-32 Vac
• 2 or 4 output relays, electromechanical or solid state
• 1 or 2 analog outputs: Isolated, 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
• Serial communications: RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter

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 transducers with frequency output will 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 Measurement

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 Channel 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 selections 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.

Other Features & Options

A built-in isolated 5, 10, or 24 Vdc excitation supply can power the transducer and eliminate the need for an external power supply. Plug-in option boards include single or dual isolated analog outputs, dual or quad relay outputs, and serial communications boards, which can upgrade the Laureate ratio meter from stand-alone monitor to system interface and control. In particular, the meter can provide an isolated 4-20 mA output signal scaled to the display. The 1/8 DIN case of Laureate meters and counters meets NEMA 4X (IP-65) standards from the front for high pressure wash-down when panel mounted.

Display

Readout
Display Range
Zero Adjust
Span Adjust
Indicators

6 LED digits, 7-segment, 14.2 mm (.56"), red or green LED
-999999 to +999999, XXXXEX notation beyond 999999
-999999 to +999999
0 to 999999
Four LED lamps

Inputs

Types
 
Signal Ground
Channel A Frequency
Channel B Frequency
Minimum Signal
Maximum Signal
Noise Filter
Contact Debounce

AC, pulses from NPN, PNP transistors, contact closures,
magnetic pickups
Common ground for channels A & B
0.005 Hz to 1 MHz
0.005 Hz to 250 kHz
Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V)
250 Vac
1 MHz, 30 kHz, 250 Hz (selectable)
0, 3, 50 ms (selectable)

Update Rate

Frequency Technique
Conversion Time
Gate Time
Time Before Zero Out

Inverse period
Gate time + 30 ms+ 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s

Accuracy

Time Base
Span Tempco
Long-term Drift

Crystal calibrated to ±2 ppm
±1 ppm/°C (typ)
±5 ppm/year

Power

Voltage, standard
Voltage, optional
Frequency
Power Isolation

85-264 Vac or 90-300 Vdc (DC operation not UL approved)
12-32 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test

Excitation Output (standard)

5 Vdc
10 Vdc
24 Vdc
Output Isolation

5 Vdc ±5%, 100 mA
10 Vdc ±5%, 120 mA
24 Vdc ±5%, 50 mA
50 Vdc to meter ground

Analog Output (optional)

Output Levels
 
Current compliance
Voltage compliance
Scaling
Resolution
Isolation

4-20 mA, 0-20 mA, 0-10V, -10 to +10V (single-output option)
4-20 mA, 0-20 mA, 0-10V (dual-output option)
2 mA at 10V ( > 5 kOhm load)
12V at 20 mA ( < 600 Ohm load)
Zero and full scale adjustable from -99999 to +99999
16 bits (0.0015% of full scale)
250V rms working, 2.3 kV rms per 1 min test
(dual analog outputs share the same ground)

Relay Outputs (optional)

Relay Types
 
Current Ratings
 
Output common
Isolation

2 Form C contact relays or 4 Form A contact relays (NO)
2 or 4 Form A, AC/DC solid state relays (NO)
8A at 250 Vac or 24 Vdc for contact relays
130 mA at 140 Vac or 180 Vdc for solid state relays
Isolated commons for dual relays or each pair of quad relays
250V rms working, 2.3 kV rms per 1 min test

Serial Data I/O (optional)

Board Selections
Protocols
Data Rates
Digital Addresses
Isolation

RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter
Modbus RTU, Modbus ASCII, simpler Laurel ASCII
300 to 19200 bps
247 (Modbus), 31 (Laurel ASCII),
250V rms working, 2.3 kV rms per 1 min test

Environmental

Operating Temp.
Storage Temp.
Relative Humidity
Protection

0°C to 60°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted

Signal Connections

Controlling the Mixing Ratio of Two Fluids

Comparing Fluid Inflow & Outflow

Controlling Coating Thickness on a Film

Synchronizing Two Conveyor Lines

Measuring Draw for Elongation