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

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

    

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Totalizer for 0-1 mA, 4-20 mA or 0-10V Signals
 Modbus or Laurel ASCII Protocol Serial I/O Transmitter
Scalable for flow rate, analog square root, totalized flow.
DIN Rail mounted, digitally programmable.

4-20 mA Current Transmitters for AC RMS Voltage or Current

 CE Mark      RoHS Mark

Features

Standard Main Board

  • Selectable Modbus or Laurel ASCII protocol.
  • Modbus RTU or ASCII modes, 2-wire connection, up to 247 digital addresses.
  • Output rate from 0-1 mA, 4-20 mA or 0-10V analog signals.
  • Output totalized rate from 0-1 mA, 4-20 mA or 0-10V analog signals.
  • Selectable square root extraction for differential pressure flow transducers.
  • Output scalable to six transmitted digits:
    -     Span adjust from 0 to ±999,999.
    - Zero adjust from -999,999 to +999,999.
  • Exceptional accuracy: ±0.005% of input span ±1 count
  • Isolated 5V, 10V or 15V dc excitation output to power transducers.
  • Output update rate: 25/sec.
  • Peak value capture.
  • 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 Main Board, plus:
  • Custom curve linearization.
  • Process time based on rate.

Description

Analog Process Totalizing

Laureate TM Series, serial I/0, process signal input totalizing transmitters accept 0-1 mA, 4-20 mA or 0-10V signals from flow meters and other transducers, such as watt meters.

  • With a Standard Main Board, the transmitter output can track rate (such as gallons per minute or watts) or totalized rate (such as gallons or kilowatt hours) whether the transducer output is linear or requires square root extraction (differential pressure flow transducers).
      

  • With an Extended Main Board, the transmitter can provided by a curvilinear spline fit with up to 180 data points. It 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 is via a special three-position screw terminal connector.

The process transmitters described in this page convert the full-scale 0-1 mA, 4-20 mA or 0-10 V analog input signal to a frequency of 10-110 kHz, which is converted internally to a 6-digit rate reading rate using inverse period timing and a calibrated quartz crystal time base. The analog-to-digital conversion is exceedingly accurate, ±0.005% of span ±1 count at 25°C. It is also fast, at 25 conversions per second. The full conversion accuracy is maintained in the serial output.

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 Laurel 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 4-20 mA Transmitters
Process Signal Input Rate Transmitter & Totalizer

Analog Input 0-1 mA 4-20 mA 0-10 V
Input resistance
Max current or voltage		 182 ohms
37 mA		 9 ohms
160 mA		 1 Mohm
600 V
Input Resolution
Span Tempco
Zero Tempco
Accuracy at 25°C
Read Rate

6 digits
±0.0025% R/°C
±0.0005 FS/°C
±0.005% FS ±1 count
25/sec (typical)
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

Pinout
 Laureate 4-20 mA Transmitters
Process Signal Input Rate Transmitter & Totalizer
(shown with optional analog output and dual relay output)

Pinout, Serial ASCII or Modbus Transmitter, Totalizer for 0-1 mA, 4-20 mA or 0-10V Signals

  DC & Externally Powered Process Transmitter
  

Pinout, Serial ASCII or Modbus Transmitter, Totalizer for 0-1 mA, 4-20 mA or 0-10V Signals
    Transmitter Powering Two Sensors

Ordering Guide
 Modbus or Laurel ASCII Protocol Serial I/O Transmitter,
Process Signal Input Rate Transmitter & Totalizer

Create a model number in this format: TM6020VF1. This example calls out a Modbus output transmitter, Standard main board, 95-240 Vac power, isolated dual solid state relays, no analog output, and voltage-to-frequency signal conditioner jumpered for 4-20 mA input. Includes plug-in screw clamp connectors.
 
Transmitter
Type		 TM  Laureate Transmitter, Modbus or Laurel ASCII protocol. $235
Main
Board		 6  Standard Main Board.
8  Extended Main Board		 NC
$40
Power 0  Isolated 95-240 Vac & 90-300 Vdc
1  Isolated 10-34 Vac & 10-48 Vdc.		 NC
$30
Setpoint
Output		 0  None.
2  Isolated Dual Solid State Relays.		 NC
$30
Input
Type		 VF1  V-to-F Converter, 4-20 mA.
VF2  V-to-F Converter, 0-1 mA.
VF3  V-to-F Converter, 0-10 V.
With Standard Main Board: Rate, square root of rate, or total from differential pressure flow transducers with a DC output.
With Extended Main Board: Above plus linearization of nonlinear inputs, 1/rate (time). 		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.

 

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

  
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