Laureate™ Rate Meter & Totalizer with
Functions A+B, A-B, AxB, A/B, A/B-1

 Applicable to dual channels A & B for rate or total

CE Mark   UL Mark RoHS Mark Made in California

   Standard Features

Product Links

Specs
Mechanical
Serial I/O options
Power options
Relay options
Analog output option
Meter manual
Serial manual
Modbus manual
Setup software
Pricing

  • 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

Description

Meter for ratio, sum, differences of two signals

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

Signal conditioner board for Laureate A/B Ratio & A/B-1 draw meterThe 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.

Specifications

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

Pinout of Laureate A/B Ratio & A/B-1 Draw panel meter

Application Examples

Controlling the Mixing Ratio of Two Fluids

Controlling the mixing ration of two fluids Displaying and alarming the input flow rate ratio of two fluids (gas or liquid) allows these to be mixed in a predetermined ratio in continuous processes. The sensing element is normally a turbine flowmeter, which outputs pulses at a frequency proportional to flow rate. The A/B ratio can also be displayed for totalized rate (or delivered volume).

Comparing Fluid Inflow & Outflow

Comparing Fluid Inflow & Outflow The ratio of the inflow and outflow rates of a tank is a measure of the relative filling or emptying rate. The same meter can also be programmed to display the net inflow or outflow rate in flow units, or to display totalized inflow our outflow in volume units. Any of these parameters can be alarmed using the dual relay board and be transmitted via 4-20 mA, RS-232 or RS-485.

Controlling Coating Thickness on a Film

Using a ratio meter to control coating thickness on a film In this application, Channel A measures the rate at which a coating material is applied, as measured by a flow meter, while Channel B measures the speed of the film based on pulses from a proximity switch. Displaying and alarming the A/B ratio assures that an even thickness of coating material is applied as the speed of the film is varies.

Synchronizing Two Conveyor Lines

Using a ratio meter to synchronize to conveyor lines The dual-channel Laureate counter can measure the speed of conveyor lines by using the output of proximity switches which sense gear teeth or spokes of rotating drive wheels. Displaying the speed ratio of two lines allows line speeds to be adjusted so that material arrives at work stations when needed.

Measuring Draw for Elongation

Using a draw meter to display and control elongation of film between rollers Draw (Ch A / Ch B - 1) can be used to display the elongation of films compressed between rollers, the shrinkage films, and the RPM difference of rollers whose speed is varied to maintain tension. The six-digit resolution of the Laureate dual channel counter / rate meter is ideal for comparison of rates that are close to each other.

Ordering Guide
Laureate™ A/B Ratio & A/B-1 Draw Meters

 Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide).

  Quantity
Main
Board
L7  Extended Main Board, Green LEDs
L8  Extended Main Board, Red LEDs
$270
$270

Note: Extended capability is required for arithmetic functions, simultaneous rate and total in the same counter, phase, stopwatch, batching, and custom curve linearization.

 
Power Isolated 85-264 Vac
Isolated 12-32 Vac or 10-48 Vdc
NC
$30
Relay
Output
None
Two 8A Contact Relays
Two Solid State Relays
Four 8A Contact Relays
Four Solid State Relays
NC
$80

$55

$100
$75
Analog
Output
None
Single isolated 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
Dual isolated 4-20 mA, 0-20 mA, 0-10V
NC
$90
$135
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 Frequency.  FR
Add-on
Options
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 with 1/8 DIN cutout
BOX2 
BOX1 plus IPC
NC
$19

$39

$15

$40

$140

$180
 

Configured model number

L70000FR

Configured price per model

$270

Quantity

1

Extended price

$270

 

 

  

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