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Laureate™ Frequency, Rate & Period Meter
With dual, independently field-scalable channels

frequency meter
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frequency meters

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Standard Counter

  • Two independently field-scalable channels selected by front panel pushbutton
  • Frequencies from 0.005 Hz to 1 MHz
  • Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac.
  • 6-digit resolution at update rates up to 25/s
  • Line frequency measurement to 60.0000 in a few line cycles
  • Selectable "count by" of 10 or 100 with rounding
  • Square root extraction
  • Green or red display
  • Universal AC power, 85-264 Vac
  • Isolated 5, 10 or 24 Vdc excitation supply to power sensors
  • NEMA 4X, 1/8 DIN case
  • Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark) and RoHS

Extended Counter
All capabilities of Standard Counter, plus:

  • Rate and total simultaneously
  • Custom curve linearization
  • Arithmetic functions A+B, A-B, AxB, A/B, A/B-1 (draw)

Options

  • Low voltage power: 10-48 Vdc or 12-30 Vac
  • Dual relays: Form C contact or Form A solid state
  • Analog output: Isolated, 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
  • Serial communications: RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter

frequency meter

Description

The Laureate dual-channel frequency, rate and period meter is a basic operating mode of the Laureate counter with the FR signal conditioner board. It can display frequency from 0.005 Hz to 1 MHz, rate in engineering units, and period (inverse of frequency). The normal displayed value can range up to 999,999 counts. Above that level, the display will flash and go into four-digit XXXXEX scientific notation. Square root extraction is standard. Each channel (A or B) may be independently scaled for frequency, rate or period. The displayed channel is selected via a front panel pushbutton. Examples of applications are the accurate display of AC line frequency, RPM, speed from proximity switch inputs, and flow from turbine flow meter inputs.

Fast, high resolution measurements. The Laureate counter determines frequency by timing an integral number of periods over a specified gate time, and then taking the inverse of period. Rate is obtained by multiplying the input by a scale factor. The inverse period approach allows greater accuracy and faster update times than conventional meters which count signal pulses over a specified time interval. AC line frequency may be accurately measured to 50.0000 or 60.0000 Hz in a few line cycles. 1000 Hz signals may be measured to 0.01 Hz resolution at up to 25 readings per second. Fast response is ideal for alarm and control applications.

To reduce the effects of signal noise, a count by 10 or 100 feature with rounding is selectable. Variations in the displayed reading can also be reduced by selecting a longer gate time. An adaptive filter can reduce variations due to noise while rapidly responding to actual changes in the signal.

An Extended counter version provides all capabilities of the Standard counter plus the following:

  • Rate and total simultaneously. One channel can display total while the other displays rate. The selection for either channel is via a front panel pushbutton. This mode is ideal for flow applications when the same signal is applied to both channels.
  • Custom curve linearization. Exceptionally accurate custom curve linearization allows linearization of the low end of turbine flowmeters. For setup, up to 180 data points can be input into a spreadsheet or text file by the user. The computer then calculates nonlinear segments, which are downloaded into the meter via RS-232. The Extended version allows linearized rates to be totalized.
  • Arithmetic functions. The Extended counter makes arithmetic functions available, namely A+B, A-B, AxB, A/B and A/B-1 (draw). For example, A+B allows two input flows to be summed for total flow, while A-B allows outflow to be subtracted from inflow for net flow. If transducers with a frequency output are used, AxB allows horsepower to be displayed based measured torque and RPM, or based on force and velocity. A/B can be used for the proper mixing of ingredients, while A/B-1 (draw) is used to compare rates for stretching or tensioning.

Signal conditioner board for Laurel Frequency, Rate and Period MeterThe FR 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, and high-level AC line inputs up to 250 Vac. A built-in isolated 5, 10, or 24 Vdc excitation supply can power proximity switches and other sensors, thus eliminating the need for an external power supply.

Other Features and Options. Plug-in isolated analog output, dual setpoint controller, and serial communications boards can upgrade the Laureate frequency, rate and period meter from a stand-alone monitor to system interface and control. 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.

frequency meter

Specifications

Display
Readout
Display Range
Zero Adjust
Span Adjust
Indicators
6 LRD digits, 7-segment, 14.2 mm (.56"), red or green.
-999999 to +999999, XXXXEX notation beyond 999999
-999999 to +999999
0 to 999999
Four LED lamps
Inputs

Types
 
Signal Ground
Channel A Freq.
Channel B Freq.
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
Freq. 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)
12-30 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 (jumper selectable)
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 Contact Relay Outputs (optional)
Relay Type
Load Rating
Isolation
Form C, SPDT
8A at 250 Vac or 24 Vdc
250V rms working, 2.3 kV rms per 1 min test
Dual Solid State Relay Outputs (optional)
Relay Type
Load Rating
Isolation
Form A, SPST, normally open
130 mA at 140 Vac or 180 Vdc
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
Electrical Connections
Signal pinout of Laurel frequency, rate and period meter

flow meter

Typical Applications

AC Line Frequency

AC Line Frequency Meter The Laureate will accept line voltages up to 250 Vac and display line frequency to 6-digit accuracy (50.0000 or 60.0000) in a few line cycles. Fast low frequency response is achieved by timing the period and taking its inverse.

RPM and Speed

Tachometer and Pulse Input Rate Meter The Laureate can sense the low-level signals from magnetic pickups or the NPN or PNP transistor output of active sensors. These can be powered directly by the meter. Display in RPM or units of speed is achieved by mathematically scaling the meter.

Flow Rate and Simultaneous Total

Simultaneous Rate Meter and Totalizer The Laureate is compatible with all flow meters which generate pulses at a frequency proportional to flow rate. The Extended version can display scaled rate or total for the same input at the push of a button, and alarm from both the rate and total. The Extended version can also linearize flow transducers so as to extend their dynamic range.

Combining Two Rates

Dual Pulse Input Rate Meter to Combine Two Rates The Extended Laureate offers A+B, A-B and A/B arithmetic functions. A+B allows two input flows to be summed for total flow, while A-B allows outflow to be subtracted from inflow for net flow. Flow ratios aid in the proper mixing of ingredients

Custom Curve Linearization

Custom Curve Linearization for Laureate Rate Meters The Extended Laureate can linearize the output turbine flow meters, which tend to be nonlinear on the low end. Linearizing improves the dynamic range and accuracy of turbine flow meters.

System-level Capabilities

The Laureate dual channel rate meter can independently scale, display and alarm two pulse input channels. All signal or alarm data can further be transmitted via RS-232 or RS-485, including peak readings and arithmetic combinations of the two rates. The displayed rates can also be transmitted as an isolated 4-20 mA or 0-10V analog output.

System Interfaces of Laureate Frequency Meters and Rate Meters

Ordering Guide
Laureate™ Frequency, Rate & Period Meters
 Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide).

Quantity
Main
Board
L5 Standard Main Board, Green LEDs
L6  Standard Main Board, Red LEDs
L7  Extended Main Board, Green LEDs
L8  Extended Main Board, Red LEDs
$230
$230

$270

$270
With Standard Main Board: Scalable to ±999,999 for frequency, rate, square root of rate, up or down total, period, A-to-B time interval.
With Extended Main Board: Above, plus rate and total simultaneously, ratio (A/B), draw (A/B-1), other arithmetic functions (AxB, A+B, A-B), phase angle, stopwatch, up/down counting, batching operation, custom curve linearization.
 
Power Isolated 85-264 Vac
Isolated 12-30 Vac or 10-48 Vdc
NC
$30
Relay
Output
None
Dual 8A Contact Relays
Isolated Dual Solid State Relays
NC
$80

$55
Analog
Output
None
Isolated 0-20 mA & 0-10 V
NC
$90
Digital
Interface
None
Isolated RS-232
Isolated RS-485
Isolated Modbus RS-485
USB.
USB-to-RS485 converter
NC
$60

$80

$90

$60

$100
Input
Type
FR  Dual-Channel Pulse Input Signal Conditioner  NC
Add-on
Options
EB  Extra bight red LED display
BL  Blank lens without button pads
CBL01  RJ11-to-DB9 cable
CBL02  USB-to-DB9 adapter
CBL05 
USB Cable, A to B
IPC 
Clear front panel cover sealed to NEMA 4X / IP65
BOX1 
NEMA-4X wall-mount enclosure
BOX2 
BOX1 plus IPC
$30
NC

$19

$39

$15

$40

$140

$180
 
Configured model number L50000FR
Configured price per model $230
Quantity 1
Extended price $230
 

 

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laurels Logo Laurel Electronics, Inc.
Industrial Instrumentation & Displays
3183-G Airway Avenue
Costa Mesa, CA 92626, USA
Tel:      
Fax:
     
(714) 434-6131
(714) 434-3766

  
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