Dual Pulse Input Totalizer 4-20 mA Current Transmitter

Rate or total in same transmitter, square root extraction. DIN Rail mounted, digitally programmable.
Standard Main Board
  • Isolated 4-20 mA or 0-10V transmitter outputs, selectable.
  • Two independently field-scalable pulse input channels.
  • Square root extraction for differential pressure flow transducers
  • Up counting from zero to preset value using positive scale factor.
  • Output resolution: 0.025% of span (12 bits).
  • DIN rail mount package only 22.5 mm thick.
  • Easy setup using Laurel's PC-based Instrument Setup Software.
  • Optional dual solid state relays for alarm or control.
  • Pulse input rates 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.
  • Internal conversion of input to six-digit reading:
      - Digital span adjust from 0 to ±999,999.
      - Digital zero adjust from -999,999 to +999,999.
  • Down counting from preset to zero using negative scale factor.
  • 5V, 10 V or 15V dc excitation output to power sensors.
  • Detachable screw clamp plug connectors.
Extended Main Board
All capabilities of the Standard Counter, plus:
  • Channel A total and Channel B rate simultaneously.
  • Counting on Channel A, using Channel B to inhibit counting.
  • Up/down counting on Channel A, using Channel B to control count direction.
  • Arithmetic functions A+B, A-B, AxB, A/B, A/B-1 (draw).
Universal Pulse or AC Input Signal Conditioner
Laureate TM Series serial output, pulse input totalizer 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 pulse rates can be as high as 1 MHz.

With a Standard Main Board, the transmitter output can be scaled to engineering units, for example to transmit totalized flow in gallons from a flow meter output. 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), or A/B-1 (draw or relative elongation of material between rollers).
Exceptional Accuracy and Stability
The analog output is generated by an ultra-linear 12-bit (4096 step) digital-to-analog convert (DAC) whose output span can be adjusted from 0 to ±999,999 counts and zero can be adjusted from -999,999 to +999,999 counts. The analog output has a rated accuracy of ±0.05% of output span. The output update rate is 25/sec.

Transmitter programming is via a three-terminal RS-232 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).

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


Pulse Input
Types AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups.
Signal Ground Common ground for channels A & B.
Minimum Signal Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V).
Maximum Signal 250 Vac
Maximum Frequency 1 MHz, 30 kHz,  250 Hz (selectable).
Contact Debounce 0, 3, 50 ms (selectable).
Transducer Excitation Output (standard)
Jumper Selection 1 10V @ 60 mA, isolated to 50V from signal ground
Jumper Selection 2 5V @ 50 mA, isolated to 50V from signal ground
Jumper Selection 3 15V @ 60 mA, non-isolated
Dual Relay Output (optional)
Relay Type Two solid state relays, SPST, normally open, Form A
Load rating 120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance.
Analog Output (optional)
Output Levels 4-20 mA and  0-10 Vdc (selectable)
Compliance, 4-20 mA 12V ( 0-600 ohm load )
Compliance, 0-10V 2 mA ( 5 kOhm load )
Output Resolution 12 bits (4,096 steps)
Output Accuracy ±0.05% of output span
Output Update Rate 25/sec max
Output Isolation 250V rms working, 2.3 kV rms per 1 minute test
Power Input
Standard power 95-240V AC ±10% or 90-300V DC
Low power option 12-30V AC or 10-48V DC
Frequency DC or 47-63 Hz
Power Isolation 250V rms working, 2.3 kV rms per 1 min test.
Case Dimensions 120 x 101 x 22.5 mm
Case Mounting 35 mm rail per DIN EN 50022
Electrical Connections Detachable screw clamp plug connectors
Operating Temperature 0°C to 70°C
Storage Temperature -40°C to 85°C
Relative Humidity 95% at 40°C, non-condensing

Typical Applications

Up/Down Totalizing
Up/down totalizing is provided by a mode of the Extended totalizing transmitter where pulses are either added or subtracted on Channel A based on a direction input on Channel B. The unit can also be programmed so that counting by Channel A is inhibited by an input on Channel B.
Combining Two Totals
A+B, A-B, A/B and AxB arithmetic functions are available with the Extended totalizing transmitter. A+B can sum two totals, while A-B subtracts the outflow total from inflow total. A/B ratio applied to two totals helps assure the proper mixing of components.
Up or Down Counting with Preset
A single Laureate dual-channel totalizing transmitter will handle two repetitive fill operations by counting from zero up to a preset, or down from a preset to zero. The dual relay option is required.
Machine ON Time and Utilization
An easy way to measure the ON time of machines is to count AC line cycles and scale the total to hours. To display machine utilization or duty cycle in percent, use the Extended totalizing transmitter. Connect Channel A to switched AC and Channel B to the AC line, and apply a 100 multiplier to the A/B ratio.
Total and Rate Simultaneously
The Extended version of the Laureate dual channel totalizing transmitter can transmit scaled rate or total for the same channel at the push of a button, and alarm both the rate and total. The Extended version can also do curve linearization, thereby extending the working range and accuracy of flow transducers.
Pinout Laureate 4-20 mA Transmitter, Dual Pulse Input for Totalizing
(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
5672 Bolsa Avenue Huntington Beach, CA 92649 - USA - Ph (714) 622-2000 - Fax (714) 622-2001