Laurel Electronics for Digital Panel Meters, Counters, Timers, Transmitters, Digital Displays

Digital Panel Meters - Counters - Timers
DIN Rail Transmitters - Large Digit Displays

    

Price List  |  Distributors  |  Search  |  Inquiry  |  Home

Dual Pulse Input Channels for
Frequency, Rate & Period
Modbus or Laurel ASCII Protocol Serial I/O Transmitter
 Rate or total in same transmitter, square root extraction.
DIN Rail mounted, digitally programmable.

Features

Standard Main Board

  • Selectable Modbus or Laurel ASCII protocol.
  • Modbus RTU or ASCII modes, 2-wire connection, up to 247 digital addresses.
  • Two independently field-scalable pulse input channels.
  • 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.
  • Input signal scaled to six-digit readings:
    - Digital span adjust from 0 to ±999,999.
    - Digital zero adjust from -999,999 to +999,999.
  • Selectable "count by" of 10 or 100 with rounding.
  • Line frequency measurement to 60.0000 in a few line cycles.
  • Square root extraction standard.
  • 5V, 10 V or 15V dc excitation output to power sensors.
  • DIN rail mount package only 22.5 mm thick.
  • Detachable screw clamp plug connectors.
  • Easy setup using PC-based Instrument Setup Software.
  • Optional dual solid state relays for alarm or control.

Extended Main Board

  • All capabilities of the Standard Counter, plus:
  • Rate and total simultaneously.
  • Custom curve linearization.
  • Arithmetic functions A+B, A-B, AxB, A/B, A/B-1 (draw).
 		Serial ASCII or Modbus Transmitter, Frequency, Rate or Period Input

CE Mark       RoHS Mark

Description

Frequency, Rate or Period from Pulse or AC Signals

Laureate TM Series serial output, pulse input frequency, rate and period transmitters accept two independently scalable input channels from a wide range of pulse sources, such as NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC voltages to 250 Vac. Input frequencies can range from 0.005 Hz to 1 MHz. Applications include AC line frequency measurement, RPM or speed from proximity switch inputs, and flow rates or totals from turbine flow meter inputs.

  • With a Standard Main Board, the transmitter output can be scaled to track frequency in Hz, rate (such as gallons per minute), or period (inverse of frequency). Square root extraction is standard.
      
  • With an Extended Main Board, the transmitter output can track rate or totalized rate (such as gallons) whether the transducer output is linear, requires square root extraction, or requires custom curve linearization. The latter can be provided by a curvilinear spline fit with up to 180 data points. The transmitter can also count up to a preset total or down from a preset total to zero. Such applications typically make use of optional dual solid state relays, which are available as options. External reset of totals can be via Modbus commands or via a special three-position screw terminal connector. The two input channels A & B can also be combined arithmetically to provide an analog transmitter output that tracks A+B (e.g., sum of two flows), A-B (e.g., difference of two flows), AxB (e.g., horsepower as product of force and RPM), A/B (ratio of two flow), and A/B-1 (draw or relative elongation of material between rollers).

Exceptional Accuracy and Stability at High Read Rates

Signal Conditioner Board for Serial ASCII or Modbus Transmitter, Frequency, Rate or Period Input

Laureate pulse input frequency and rate transmitters determine frequency by taking the inverse of period as measured with a calibrated (±2 ppm) quartz crystal time base. This results in extremely accurate and stable 6-digit internal readings (±999,999 counts), which are then scaled in software to engineering units such as Hz, RPM, liters/sec, or gallons/minute. The inverse period approach provides greater accuracy and faster update times than conventional counters, which count pulses over a specified time interval. The full conversion accuracy is maintained in the Modbus output.

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.

The update rate of the analog output is a programmed gate time + 30 ms + 0-2 signal periods. 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.

Serial Data I/O & Programming

Laureate TM Series transmitters send data as a serial digital signal. RS485 or RS232 signal levels are jumper selectable and can each be associated with either the Modbus protocol or Laurel’s simpler Custom ASCII protocol.

  • Modbus protocol operation is fully compliant with the Modbus Over Serial Line Specification V1.0 (2002) for 2-wire, half-duplex connection. This includes RTU or ASCII modes, addressing of up to 32 devices per RS485 line without a repeater, and up to 247 digital addresses. Modbus operation allows devices by different manufacturers to be connected in parallel and be addressed using the same protocol.
     
  • Laurel’s Laurel ASCII protocol allows up to 31 Laureate devices to be addressed on the same RS485 data line. It is simpler than the Modbus protocol and is recommended when all devices are Laureates. It also allows use of Laurel’s datalogging software.

Transmitter programming is via the unit's three-terminal serial port using Laurel's PC-based Instrument Setup Software. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Laurel (P/N CBL03). Laurel's serial output transmitters and meters can also be part of PC-based data logging systems using Laurel's Datalogging Software, which operates under the Laurel ASCII Protocol. A single software command switches between the Modbus and Laurel ASCII Protocols.

Transmitter Options

Options include dual solid state relays for local alarm or control and an isolated 4-20 mA or 10V (selectable) analog output, effectively providing a linearized analog transmitter output that tracks the reading that would be transmitted digitally. The analog output provides 12-bit (4096 step) resolution of the output span and is ultra-linear to within one bit. Its accuracy is ±0.05% of span for all signal types, except for AC rms, where accuracy is ±0.1%. Output isolation from signal and power grounds is provided by a separate on-board power supply, which can drive 20 mA into a 500 ohm load for 10V compliance. Output isolation eliminates problems caused by ground loops.

DIN Rail Mounting 

Laureate transmitters are housed in a 35 mm DIN rail case that is only 22.5 mm (0.89") thick. Signal connections are via detachable screw clamp plug connectors.

Specifications
 Laureate Serial Output Transmitters
Pulse Input for Frequency, Rate or Period

Pulse Input
Types

Ch A Frequency, Max
Ch B Frequency, Max
Signal Ground
Minimum Signal
Maximum Signal
Maximum Frequency
Contact Debounce
Time Base Accuracy
Span Tempco
Long-term Drift		 AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups.
1 MHz.
250 kHz.
Common ground for channels A & B.
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).
Quartz crystal calibrated to ±2 ppm.
±1 ppm/°C (typ)
±5 ppm/year
Serial I/O (standard)
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance		 RS485 (default) or RS232 (jumper selectable)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test.
Modbus RTU, Modbus ASCII, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002).
Transducer Excitation Output (standard)
Jumper Selection 1
Jumper Selection 2
Jumper Selection 3		 10V @ 60 mA, isolated to 50V from signal ground
5V @ 50 mA, isolated to 50V from signal ground
15V @ 60 mA, non-isolated
Dual Relay Output (optional)
Relay Type
Load rating		 Two solid state relays, SPST, normally open, Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance.
Analog Output (optional)
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation		 0-20 mA, 4-20 mA or  0-10 Vdc (selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
250V rms working, 2.3 kV rms per 1 minute test
Power Input
Standard power
Low power option
Frequency
Power Isolation		 95-240V AC ±10% or 90-300V DC
12-30V AC or 10-48V DC
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test.
Mechanical
Case Dimensions
Case Mounting
Electrical Connections		 120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw clamp plug connectors
Environmental
Operating Temperature
Storage Temperature
Relative Humidity		 0°C to 70°C
-40°C to 85°C
95% at 40°C, non-condensing

Typical Applications

AC Line Frequency
AC Line Frequency Meter or Transmitter 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 or Transmitter 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 or Transmitter 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 or Transmitter 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 or Transmitters 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 isolated isolated 4-20 mA or 0-10V analog output.

System Interfaces of Laureate Frequency / Rate Transmitters

Pinout
 Laureate Serial Output Transmitters
Pulse Input for Frequency, Rate or Period
(shown with optional analog output and dual relay output)

Pinout, Serial ASCII or Modbus Transmitter, Frequency, Rate or Period Input

                                   Transmitter Powering a Single Sensor
  

Pinout, Serial ASCII or Modbus Transmitter, Frequency, Rate or Period Input

 Pinout, Serial ASCII or Modbus Transmitter, Frequency, Rate or Period Input
Transmitter Powering Two Sensors Transmitter with Active or Passive Sensors

Ordering Guide
 Modbus or Laurel ASCII Protocol Serial I/O Transmitters,
Pulse Input for Frequency, Rate or Period

Create a model number in this format: TA6020FR. This example calls out a Modbus output transmitter, standard main board, 95-240 Vac power, isolated dual solid state relays, no analog output, and a dual signal pulse input signal conditioner. Includes plug-in screw clamp connectors.
  
Transmitter
Type		 TM    Laureate Transmitter, Modbus or Laurel ASCII Protocol. $210
Main Board 6  Standard Main Board.
8  Extended Main Board
Note: Extended allows custom curve linearization and rate from successive readings.		 NC
$40
Power 0  Isolated 95-240 Vac & 90-300 Vdc
1  Isolated 12-30 Vac & 10-48 Vdc.		 NC
$30
Setpoint
Output		 0  None.
2  Isolated Dual Solid State Relays.		 NC
$30
Analog Output 0  None.
1  4-20 mA or 0-10V analog output.		 NC
$25
Input Type FR  Dual-Channel Frequency.  NC
Accessories CBL03  RS-232 cable, TM to computer.
CBL02  USB to RS-232 cable adapter.		 $19
$39
 
Laurel Electronics domestic orders Order from distributors for shipment to USA or Canada.
Laurel Electronics international orders Order online for international shipment.

 

Price List  |  Distributors  |  Search  |  Inquiry  |  Privacy  |  Home

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

  
© 1996-2008 Laurel Electronics, Inc.