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This Laureate transmitter accepts two independently scalable input channels A & B 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.
Arithmetic functions A+B, A-B, AxB, A/B or A/B-1 are made available by the Extended counter main board and can track the sum, difference, product, ratio, or draw of both input channels. These functions can be applied to scaled rates, scaled totals, square root of rates, totals after square root extraction, custom curve linearized rates, or totals after custom curve linearization.
Exceptional Accuracy and Stability. Laureate pulse input frequency and rate transmitters determine frequency by taking the inverse of period as measured with a calibrated quartz crystal time base. Extremely accurate 6-digit internal readings (±999,999 counts) are processed in software.
The update rate of the transmitter output is a programmed gate time + 30 ms + 0-2 signal periods. For pulse rates of 60 Hz and above, the update rate would be 20 per second. Such fast update rates are ideal for alarm and control.
Standard features of Laureate LTE transmitters include:
Node discovery and configuration of Laureate Ethernet transmitters are easily achieved with Laurel's Windows based Instrument Setup Software. Additional features are provided by Laurel's Windows based Node Manager Software, such as the ability to send emails or test messages either periodically or in the event of an alarm. Both softwares run on a PC under MS Windows, are at no charge, and can be downloaded from this website.
| Pulse Inputs | |
|---|---|
| Signal Types | AC, pulses from NPN, PNP transistors, contacts, magnetic pickups |
| Signal Ground | Common ground for channels A & B. |
| Channel A Frequency | 0.005 Hz to 1 MHz |
| Channel B Frequency | 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) |
| Time Base Accuracy | Quartz crystal calibrated to ±2 ppm |
| Arithmetic Functions | A+B, A-B, AxB, A/B, A/B-1 |
| Analog Output (standard) | |
| Output Levels | 4-20 mA and 0-10 Vdc (selectable) |
| Compliance, 4-20 mA | 10V (0-500Ω load) |
| Compliance, 0-10V | 2 mA (5 kΩ load) |
| Output Resolution | 16 bits (65,536 steps) |
| Output Accuracy | ±0.02% of output span |
| Output Update Rate | Programmed gate time + 30 ms + 0-2 signal periods |
| Output Isolation | 250V rms working, 2.3 kV rms per 1 minute test |
| Ethernet Data I/O (standard) | |
| Type | 10/100 Base-T Ethernet per IEEE 802.3 |
| Data Rates | 300, 600, 1200, 2400, 4800, 9600, 19200 baud |
| Output Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Serial Protocol | Modbus TCP |
| Modbus Compliance | Modbus over Serial Line Specification V1.0 (2002) |
| Digital Addresses | 247 |
| Dual Relay Output (standard) | |
| Relay Type | Two solid state relays, SPST, normally open, Form A |
| Load Rating | 120 mA at 140 Vac or 180 Vdc |
| Sensor Excitation Output (standard) | |
| Output Levels | 5V@100 mA, 10V@120 mA, 24V@50 mA (jumper selectable) |
| Output Isolation | 50V from signal ground |
| Power Input | |
| Standard Power | 85-264 Vac or 90-300 Vdc |
| Low Power Option | 10-48 Vdc or 12-32 Vac |
| Power Frequency | DC or 47-63 Hz |
| Power Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Power Consumption | 2.5W typical at 24V, 4.0W with max excitation output |
| Mechanical | |
| Dimensions | 129 x 104 x 22.5 mm case |
| Mounting | 35 mm rail per DIN EN 50022 |
| Electrical Connections | Plug-in screw-clamp connectors |
| Environmental | |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 95% at 40°C, non-condensing |
| Cooling Required | Mount transmitters with ventilation holes at top and bottom. Leave 6 mm (1/4") between transmitters, or force air with a fan. |
| Controlling the Mixing Ratio of Two Fluids | |
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Transmitting 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 flow meter, which outputs pulses at a frequency proportional to flow rate. The A/B ratio can also be transmitted for totalized rate (or delivered volume). |
| Comparing Fluid Inflow & Outflow | |
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The ratio of the inflow and outflow rates of a tank is a measure of the relative filling or emptying rate. The same transmitter can also be programmed to transmit the net inflow or outflow rate in flow units, or to transmit 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. |
| Controlling Coating Thickness on a Film | |
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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. Transmitting and alarming the A/B ratio assures that an even thickness of coating material is applied as the speed of the film is varies. |
| Instrumenting a Pulsed Laser System | |
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The dual-channel Laureate transmitter can measure the speed of conveyor lines by using the output of proximity switches which sense gear teeth or spokes of rotating drive wheels. Transmitting 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 | |
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Draw (Ch A / Ch B - 1) can be used to indicate the elongation of films compressed between rollers, the shrinkage films, and the RPM difference of rollers whose speed is varied to maintain tension. The high resolution of Laureate dual channel transmitters is ideal for comparison of rates that are close to each other. |
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