The Standard counter provides commonly used basic capabilities:
 The Laureate dualchannel 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 fourdigit XXXXEX scientific notation. 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 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.
 For noise reduction, 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 digital filter is selectable to 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 RS232. The Extended version allows linearized rates to be totalized.
 Arithmetic functions. The Extended counter makes arithmetic functions available, namely A+B, AB, AxB, A/B and A/B1 (draw). For example, A+B allows two input flows to be summed for total flow, while AB 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/B1 (draw) is used to compare rates for stretching or tensioning.
The FR dualchannel signal conditioner accepts inputs from proximity switches with a PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, lowlevel outputs from turbine flow meters down to 12 mV, and highlevel AC line inputs up to 250 Vac. A builtin isolated 5, 10, or 24 Vdc excitation supply can power proximity switches and other sensors, thus eliminating the need for an external power supply.
Designed for system use. Optional plugin boards for communications and control include Ethernet and other serial communication boards, dual or quad relay boards, and single or dual isolated analog output boards. Laureates may be powered from 85264 Vac or optionally from 1232 Vac or 1048 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. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.
 Two independently fieldscalable channels A & B for frequency, rate or total
 Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac
 Frequencies from 0.005 Hz to 1 MHz
 Line frequency measurement to 60.0000 in a few line cycles
 Universal 85264 Vac / 90300 Vdc or 1048 Vdc / 1232 Vac power
 Transducer excitation output (isolated)
 Wide choice of options:
 2 or 4 relays, mechanical or solid state (isolated)
 1 or 2 analog outputs (isolated)
 Serial data I/O: Ethernet, USB, RS485, RS232 (isolated)
 Rate and total simultaneously, custom curve linearization, arithmetic
functions A+B, AB, AxB, A/B, A/B1 (draw)
Display  

Readout  6 LED digits, 7segment, 14.2 mm (.56"), red or green. 
Display Range  999999 to +999999, XXXXEX notation beyond 999999 
Zero Adjust  999999 to +999999 
Span Adjust  0 to 999999 
Indicators  Four LED lamps 
Inputs  
Types  AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups. 
Signal Ground  Common ground for channels A & B 
Channel A Freq.  0.005 Hz to 1 MHz 
Channel B Freq.  0.005 Hz to 250 kHz 
Minimum Signal  Nine ranges from (12 to +12 mV) to (+1.25 to +2.1V). 
Maximum Signal  250 Vac 
Noise Filter  1 MHz, 30 kHz, 250 Hz (selectable) 
Contact Debounce  0, 3, 50 ms (selectable) 
Update Rate  
Freq. Technique  Inverse period 
Conversion Time  Gate time + 30 ms+ 02 signal periods 
Gate Time  Selectable 10 ms to 199.99 s 
Time Before Zero Out  Selectable 10 ms to 199.99 s 
Accuracy  
Time Base  Crystal calibrated to ±2 ppm 
Span tempco  ± 1 ppm/°C (typ) 
Longterm Drift  ± 5 ppm/year 
Power  
Voltage, standard  85264 Vac or 90300 Vdc 
Voltage, optional  1232 Vac or 1048 Vdc 
Frequency  DC or 4763 Hz 
Power consumption (typical, base meter)  1.2W @ 120 Vac, 1.5W @ 240 Vac, 1.3W @ 10 Vdc, 1.4W @ 20 Vdc, 1.55W @ 30 Vdc, 1.8W @ 40 Vdc, 2.15W @ 48 Vdc 
Power Isolation  250V rms working, 2.3 kV rms per 1 min test 
Excitation Output (standard)  
5 Vdc  5 Vdc ± 5%, 100 mA 
10 Vdc  10 Vdc ± 5%, 120 mA 
24 Vdc  24 Vdc ± 5%, 50 mA 
Output Isolation  50 Vdc to meter ground 
Analog Output (optional)  
Output levels  420 mA, 020 mA, 010V, 10 to +10V (singleoutput option) 
420 mA, 020 mA, 010V (dualoutput option)  
Current compliance  2 mA at 10V ( > 5 kΩ load) 
Voltage compliance  12V at 20 mA (< 600Ω load) 
Scaling  Zero and full scale adjustable from 99999 to +99999 
Resolution  16 bits (0.0015% of full scale) 
Isolation  250V rms working, 2.3 kV rms per 1 min test 
(dual analog outputs share the same ground)  
Relay Outputs (optional)  
Relay types  2 Form C contact relays or 4 Form A contact relays (NO) 2 or 4 Form A, AC/DC solid state relays (NO) 
Current Ratings  8A at 250 Vac or 24 Vdc for contact relays 120 mA at 140 Vac or 180 Vdc for solid state relays 
Output common  Isolated commons for dual relays or each pair of quad relays 
Isolation  250V rms working, 2.3 kV rms per 1 min tes 
Serial Data I/O (optional)  
Board selections  RS232, RS485 (dual RJ11 or RJ45 connectors), USB, Ethernet, USBtoRS485 converter, EthernettoRS485 converter 
Protocols  Modbus RTU, Modbus ASCII, Modbus TCP (Ethernet), Laurel ASCII 
Data rates  300 to 19200 baud 
Digital addresses  247 (Modbus), 31 (Laurel ASCII), 
Isolation  250V rms working, 2.3 kV rms per 1 min test 
Environmental  
Operating temperature  0°C to 55°C 
Storage temperature.  40°C to 85°C 
Relative humidity  95% at 40°C, noncondensing 
Protection  NEMA4X (IP65) when panel mounted 
Electrical Connections  
AC Line Frequency  

The Laureate will accept line voltages up to 250 Vac and display line frequency to 6digit 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  
The Laureate can sense the lowlevel 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  
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.  
Arithmetic Combinations of Two Channels  
The Extended Laureate offers A+B, AB and A/B arithmetic functions. A+B allows two input flows to be summed for total flow, while AB allows outflow to be subtracted from inflow for net flow. Flow ratios aid in the proper mixing of ingredients  
Custom Curve Linearization  
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.  
Systemlevel 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 RS232 or RS485, including peak readings and arithmetic combinations of the two rates. The displayed rates can also be transmitted as an isolated 420 mA or 010V analog output. 
Datasheet, Manual, Mechanical and Serial I/O info.  
Manufacturer site: 
Frequency, Rate & Period Meter
 Brand: Laurel Electronics, Inc.
 Model: L
 Availability: In Stock

211.70€
Available Options
Related Products
Tags: Panel Meter; Frequency, Rate & Period Meter; Laureate; Laurel Electronics