With a Standard Main Board, the transmitter output can be scaled to track total (such as gallons) or rate (such as gallons per minute). Square root extraction is standard.
With an Extended Main Board, the transmitter can also:
- Count up to a preset or down from a preset to zero. Such applications typically utilize the transmitter's two solid state relays, which are standard. External reset of totals is via a special three-position screw terminal connector.
- Perform custom-curve linearization on rate or total, for example to extend the range of transducers. Exceptionally accurate custom-curve linearization is provided by a curvilinear spline fit with up to 180 data points.
- Combine channels A and B arithmetically so that the transmitter output tracks A+B (e.g., sum of two flows or totals), A-B (e.g., difference of two flows or totals), AxB (e.g., horsepower as product of force and RPM), A/B (ratio of two flow or totals), and A/B-1 (draw or relative elongation of material between rollers).
The dual-channel signal conditioner used for pulse detection accepts inputs from proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and other signals from 12 mV to 250 Vac. Jumper selections provide optimum operation for different sensor types and noise conditions. A built-in 5V, 10V or 24V dc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.
Standard features of Laureate LTE transmitters include:
- 4-20 mA, 0-20 mA, 0-10V or -10V to +10V analog transmitter output, isolated, jumper-selectable and user scalable. All selections provide 16-bit (0.0015%) resolution of output span and 0.02% output accuracy of a reading from -99,999 to +99,999 counts that is also transmitted digitally. Output isolation from signal and power grounds eliminates potential ground loops.
- Serial communications output, RS232 or RS485 (half or full duplex), jumper selectable. Three protocols are user selectable: Modbus RTU, Modbus ASCII, or Laurel ASCII. Modbus operation is fully compliant with Modbus Over Serial Line Specification V1.0 (2002). The Laurel ASCII protocol is simpler than the Modbus protocol and is recommended when all devices are Laureates.
- Dual solid state relays, isolated, for alarm or control. Rated 120 mA at 140 Vac or 180 Vdc.
- Transducer excitation output, isolated. User selectable 5V@100 mA, 10V@120 mA or 24V@50 mA.
- Universal 85-264 Vac power. Low-voltage 10-48 Vdc or 12-32 Vac power is optional.
Easy Transmitter programming is via Laurel's Instrument Setup Software, which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Laurel (P/N CBL04).
- 4-20 mA, 0-20 mA, 0-10V or -10V to +10V transmitter output, 16 bits, isolated
- RS232 or RS485 serial data output, Modbus or Laurel ASCII protocol, isolated
- Dual 120 mA solid state relays for alarm or control, isolated
- Two independently field-scalable pulse input channels
- Up counting from zero to preset value using positive scale factor
- Down counting from preset to zero using negative scale factor
- Inputs from NPN or PNP proximity switches, contact closures, digital logic, or magnetic pickups down to 12 mV, pulse rates to 1 MHz
- Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span
- 5V, 10V or 24V dc transducer excitation output, isolated
- Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
|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).|
|Analog Output (standard)|
|Output Levels||4-20 mA, 0-20 mA, 0-10 Vdc, -10 to +10Vdc (user selectable)|
|Compliance, 4-20 mA||10V (0-500Ω load)|
|Compliance, 0-10V||2 mA (5 kΩ or higher 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|
|Serial Data Output (standard)|
|Signal Types||RS232 or RS485 (half or full duplex), jumper selectable|
|Data Rates||300, 600, 1200, 2400, 4800, 9600, 19200 baud|
|Output Isolation||250V rms working, 2.3 kV rms per 1 min test|
|Serial Protocols||Modbus RTU, Modbus ASCII, Laurel ASCII|
|Modbus Compliance||Modbus over Serial Line Specification V1.0 (2002)|
|Ethernet Connector||RJ45 jack for 10/100 Base-T Ethernet cable|
|RS232/485 Connector||Screw terminals for easy daisy chaining|
|Digital Addresses||247 for Modbus, 31 for Laurel ASCII|
|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|
|Transducer Excitation Output (standard)|
|Output Levels||5V@100 mA, 10V@120 mA, 24V@50 mA (jumper selectable)|
|Output Isolation||50V from signal ground|
|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||2W typical, 3W with max excitation output|
|Dimensions||129 x 104 x 22.5 mm case|
|Mounting||35 mm rail per DIN EN 50022|
|Electrical Connections||Plug-in screw-clamp connectors|
|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.|
Laureate Ethernet & 4-20 mA Output Transmitter with Dual Pulse Totalizer Inputs
|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.|
|Custom Curve Linearization|
|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.|
|Datasheet, Manual, Mechanical and Serial I/O info.|
4-20 mA & Serial Data Output Transmitter for Pulse Totalizer Input
- Brand: Laurel Electronics, Inc.
- Model: LT
- Availability: In Stock