Features
- Transmitter optimized for weighing applications
- Accuracy of 0.01% of reading ± 2 counts
- 4- or 6-wire hookup to avoid lead resistance effects
- 10V excitation supply for up to four 350-ohm load cells in parallel
- Count by 1, 2, 5, 10, 20, 50 or 100 with rounding
- Transmitter toggles between gross or net weight
- Auto-tare or manual tare, with tare value stored in non-volatile memory
Certificates of Compliance
The Laureate 4-20 mA, 0-20 mA, 0-10V or -10V to +10V and ethernet output transmitter for scale weighing application offers the same high performance, signal conditioning, and programmable features as Laureate digital panel meters, counters, and timers. It provides six voltage input ranges and four current input ranges, all factory calibrated and jumper selectable. This compact, inexpensive, and highly accurate transmitter features special firmware for weighing applications. It is available with the Laureate load cell or DC signal conditioner board. If you do not need the special weighing firmware, consider using the Laureate load cell transmitter or Laureate process transmitter.
The DC signal conditioner board can used in lieu of the load cell signal conditioner board, be set to ratiometric operation, and be used with the transmitter's 5 Vdc or 10 Vdc excitation. It's most sensitive full-scale range is ±200 mV with 10 µV resolution, while the load cell signal conditioner board offers most sensitive ranges of ±20 mV and ±50 mV, both with 1 µV resolution. Transmitters with both boards offer an accuracy of 0.01% of full scale ± 2 counts.
Display & Setpoint Functions for Weighing Applications
- Relay setpoint offset. The ON/OFF setpoint control action can be programmed to occur with a specified offset. For instance, if bags are to be filled to 100 lbs and the material delivery spout is known to hold and dispense an additional 2.5 lbs following shut-off, an offset of -2.5 lbs can be programmed. The setpoint can then be set to 100 lbs, and the filling valve will be automatically shut off when the measured weight reaches 97.5 lbs.
- Count-by function. The weight transmitter can be programmed so that it can be displayed via Laurel's Instrument Setup Software, which runs on a PC under MS Windows, is rounded off to multiples of 1, 2, 5, 10, 20, 50 or 100. For example, if count-by 10 is selected, the transmitter will display 20 for an internal count of 15 to 24.
- Fixed right-hand dummy zero. The transmitter can be shifted to the left for a fixed zero to the right, allowing values up to 999,990. The right-hand zero precludes the use of decimal points.
- Auto-zero function. An auto-zero limit from 0 to 9 counts can be programmed to compensate for load cell drift. Whenever the transmitter comes to rest within that limit from zero, it will auto-zero. Entering 0 disables auto-zero.
Easy scale calibration is achieved using a simple two-point calibration method. First, the desired LO IN reading is set to 0, and the desired HI IN reading is set to a desired value. With no weight on the scale, a button is pushed for LO IN. With a known weight on the scale, that button is pushed again for HI IN. The transmitter then automatically computes scale and offset for readout up to five digits in weight units.
Scale and offset can be provided by either of two user-selectable methods:
- With the coordinate reading method, the transmitter reads the high and low signal values, and the user enters the desired high an low reading values. The transmitter then calculates the span multiplier and offset. This method is ideal if an external calibration reference is available.
- With the manual coordinate method, the user enters the high and low input values in Volts plus the desired high and low reading values. This method is suitable if no external calibration reference is available.
A built-in, (isolated), 10V, 120 mA excitation supply can power up to four 350-ohm load cells in parallel. Load cell connection can be via 4 or 6 wires. With 4-wire load connection, the transmitter operates in a ratiometric mode to eliminate errors due to power supply variations. With 6-wire load connection, it also compensates for lead resistance, allowing long cable runs.
All signal conditioner board ranges are factory-calibrated, with calibration factors for each range securely stored in an onboard EEPROM. These factors can be scaled via software to accommodate external shunts, enabling field replacement of signal conditioner boards without necessitating recalibration of the associated transmitter. For optimal accuracy, factory recalibration is recommended annually. All Laurel Electronics instruments undergo factory calibration using the industry-leading Fluke calibrators, which are recalibrated yearly and certified traceable to national standards, ensuring the highest level of precision and reliability.
The optional extended Laureate computer board enhances Laureate Transmitters by displaying rates derived from successive readings and enabling highly accurate custom curve linearization. For example, it can calculate liquid volume or flow rate in a horizontal cylindrical tank using levels from a 4-20 mA transmitter. Setup is straightforward: users input up to 180 data points into a spreadsheet or text file, and the computer calculates spline-fit segments, which are then downloaded to the transmitter for precise operation.
Laureate Transmitters are easily programmed with Laurel’s free Instrument Setup Software, downloadable from our website and compatible with Windows PCs, requiring a data interface board for setup.
High read rate of up to 50 or 60 conversions per second, the Laureate™ LTE Series transmitter uses Concurrent Slope (US Pat. 5,262,780) analog-to-digital conversion to integrate signals over a full power line cycle (50 Hz or 60 Hz). This read rate enables peak and valley capture, real-time computer interfacing, and control applications. Peak and valley values are automatically captured and can be viewed using Laurel’s free Instrument Setup Software (compatible with Windows PCs) or transmitted as serial data.
Standard Features of Laureate LTE Transmitters Include:
- Ethernet I/O, (isolated). The supported protocols are Modbus RTU and ASCII, which are tunneled via Modbus TCP. Note that RS232 or RS485 data I/O is provided by Laurel's LT Series transmitters.
- 4-20 mA, 0-20 mA or 0-10V 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 loop problems. The supply can drive 20 mA into a 500 ohm (or lower) load for 10V compliance, or 10V into a 5K ohm (or higher) load for 2 mA compliance.
- Dual solid state relays, (isolated). Available for local alarm or control. Rated 120 mA at 130 Vac or 180 Vdc.
- Selectable transducer excitation output, (isolated), user selectable 5V@100 mA, 10V@120 mA, 12V@100mA, or 24V@50 mA.
- Power 85-264 Vac, (isolated), low-voltage 10-48 Vdc or 12-32 Vac power is optional.
Digital signal filtering modes can be selected to ensure stable readings in electrically noisy environments.
- An unfiltered selection provides true peak and valley readings and aids in control applications.
- A batch average filter selection averages each 16 conversions.
- An adaptive moving average filter selection provides a choice of 8 time constants from 80 ms to 9.6 seconds. When a significant change in signal level occurs, the filter adapts by briefly switching to the shortest time to follow the change, then reverts back to its selected time constant. An auto setting selects the time constant selection based on signal noise.
Two tare functions: auto-tare and manual tare. In auto-tare, an input line is grounded by an external pushbutton. This causes the current weight, which is normally the empty weight of the container to be stored in memory as an offset. In manual tare, the tare value can be entered manually via a control input pushbutton or using Laurel's free Instrument Setup Software.
Peak and valley values are automatically captured. These may be displayed via Laurel's free Instrument Setup Software, which runs on a PC under MS Windows or can be transmitted as serial data.
An (isolated) 5, 10, 12, or 24 Vdc excitation output is standard to power transducers or two-wire transmitters. Ratiometric operation, which automatically compensates for changes in the applied excitation, is jumper selectable for applications, such as bridges, where the signal to be measured is proportional to the excitation level.
LTE series DIN rail transmitters & signal conditioners can be interfaced to a wide range of sensors and transducers using one of seven available plug-in signal conditioner boards. The transmitters duplicate the high performance (high accuracy, high read rate) and extensive programmable features of Laureate 1/8 DIN digital panel meters, counters and timers. They utilize the same signal conditioners boards, much of the same firmware, and Laurel's free Windows-based Instrument Setup Software. They come in a compact DIN rail mount package with detachable screw-clamp connectors for easy wiring.
The LTE series Transmitters accessible from this page include a 4-20 mA, 0-20 mA, 0-10V, or -10V to +10V analog output (isolated, user selectable), an ethernet serial data interface (isolated, user selectable), and dual 120 mA solid state AC/DC relays (isolated). An (isolated) 5, 10, 12, or 24 Vdc transducer excitation output is included with all models other than those with a temperature or AC RMS signal conditioner.
Connecting Laureate LTE Transmitters to a Local Area Network (LAN)
Laurel LTE series Ethernet transmitters can connect directly to a LAN via an Ethernet cable. Up to 30 Laureate LT Transmitters and/or Digital Panel Meters can be configured for RS485 and daisy-chained to an LT Transmitter for seamless LAN integration. Setup for both configurations is streamlined using Laurel’s free Instrument Setup Software, which simplifies node discovery and transmitter configuration.
Flexible Communication Options for LTE Transmitters
Laureate Transmitters can be equipped with Laurel communication boards to support various interfaces and protocols. These include serial interfaces with ASCII or Modbus RTU protocols, and Ethernet interfaces with web access, ASCII, or Modbus TCP/IP protocols, ensuring versatile connectivity for your commercial applications.
| LTE Transmitter Signal Input & Function | Model Series | Analog Output | Ethernet I/O | Dual Relays | |
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| 1 | DC Input Voltage and Current | LTE-DC |  |
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| 2 | AC RMS Voltage or Current | LTE-RMS | |
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| 3 | Process Voltage or Current | LTE-P | |
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| 4 | Strain Gauge or Potentiometer Follower | LTE-SG | |
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| 5 | Weighing Applications | LTE-WA | |
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| 6 | Load Cell & Microvolt Signals | LTE-WM | |
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| 7 | Thermocouple (Types J, K, T, E, N, R, S) | LTE-TC | |
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| 8 | RTD Temperature | LTE-RTD | |
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| 9 | Resistance in Ohms | LTE-R | |
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| 10 | Frequency, Rate, Speed | LTE-FR | |
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| 11 | Pulse Input Totalizer | LTE-FR | |
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| 12 | Process Signal Totalizer | LTE-VF | |
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| 13 | Batch Controller Analog Input | LTE-FR | |
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| 14 | Batch Controller Pulse Input | LTE-FR | |
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| 15 | Sum, Difference, Ratio, Product of 2 Inputs | LTE-FR | |
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| 16 | On/Off Duty Cycle | LTE-FR | |
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| 17 | Stopwatch Timing for Single Events | LTE-FR | |
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| 18 | Average Time of Periodic Events | LTE-FR | |
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| 19 | AC Phase Angle and Power Factor | LTE-FR | |
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| 20 | Quadrature Position or Rate | LTE-QD | |
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Scale input transmitter for scale weighing applications
| Full-Scale Input | Input Impedance | Zero Adjust | Span Adjust | Error at 25°C |
|---|---|---|---|---|
| ± 200.00 mV | 1 GΩ | |||
| ± 2.0000 V | 1 GΩ | -99,999 | 0 to | 0.01% FS |
| ± 20.000 V | 10 MΩ | to +99,999 | ±99,999 | ± 2 counts |
| ± 20.000 mA | 10 Ω | |||
| Recalibration: All ranges are calibrated at the factory. Recalibration is recommended every 12 months. | ||||
| Display | ||||
|---|---|---|---|---|
| Readout | 5 LED digits, 7-segment, 14.2 mm (.56"), red or green | |||
| Range | -99999 to +99999 | |||
| -999990 to +999990 (with fixed selectable right-hand zero) | ||||
| Rounding | Count by 1, 2, 5, 10, 20, 50, 100 | |||
| Indicators | Four LED lamps | |||
| Accuracy | ||||
| Error at 25°C | 0.01% FS ± 2 counts | |||
| Span tempco | 0.0015% of reading/°C | |||
| Zero tempco | 0.1 µV/°C (use auto-zero when temperature changes) | |||
| Calibration Method | 2 points using zero weight and known weight | |||
| Noise Rejection | ||||
| CMR, DC to 60 Hz | 130 dB | |||
| NMR at 50/60 Hz | 90 dB with min filtering | |||
| A-to-D Conversion | ||||
| Technique | Concurrent Slope (Pat 5,262,780) | |||
| A-to-D rate | 60/s at 60 Hz, 50/s at 50 Hz | |||
| Output update | 56/s at 60 Hz, 47/s at 50 Hz | |||
| Display update | 3.5/s at 60 Hz, 3/s at 50 Hz | |||
| Power Supply Boards (one required) | ||||
| Voltage, standard | 85-264 Vac or 90-300 Vdc | |||
| Voltage, optional | 12-32 Vac or 10-48 Vdc | |||
| Frequency | DC or 47-63 Hz | |||
| Power consumption (typ. with four 350Ω load cells at 10V) | 2.4W @ 120 Vac, 2.7W @ 240 Vac, 2.5W @ 10 Vdc, 2.6W @ 20 Vdc, 2.75W @ 30 Vdc, 3.0W @ 40 Vdc, 3.35W @ 48 Vdc | |||
| Power Isolation | 250V rms working, 2.3 kV rms per 1 min test | |||
| Excitation Output (standard) | ||||
| 5 Vdc | 5 Vdc ± 5%, 100 mA (jumper selectable) | |||
| 10 Vdc | 10 Vdc ± 5%, 120 mA (jumper selectable) | |||
| 12 Vdc | 12 Vdc ± 5%, 100 mA (jumper selectable) | |||
| 24 Vdc | 24 Vdc ± 5%, 50 mA (jumper selectable) | |||
| Output Isolation | 50 Vdc from signal ground | |||
| Ratiometric operation | Automatically compensates for changes in excitation level. | |||
| Analog Output Board (one optional) | ||||
| Output levels | 4-20 mA, 0-20 mA, 0-10V | |||
| Current compliance | 2 mA at 10V ( > 5 kΩ load) | |||
| Voltage compliance | 12V at 20 mA (< 600 Ω load) | |||
| Scaling | Zero and full scale adjustable from -99999 to +99999 | |||
| Resolution | 16 bits (0.0015% of full scale) | |||
| Isolation | 250V rms working, 2.3 kV rms per 1 min test | |||
| Relay Output Boards (one optional) | ||||
| Dual magnetic relays | 2 Form C, 8A max, 440Vac or 125Vdc max, 2500VA or 300W | |||
| Quad magnetic relays | 4 Form A (NO), 8A max, 440Vac or 125Vdc max, 2500VA or 300W | |||
| Dual solid state relays | 2 Form A (NO), AC or DC, 0V - 400V, 120Ma, 35Ohms (max at On-State) | |||
| Quad solid state relays | 4 Form A (NO), AC or DC, 0V - 400V, 120Ma, 35Ohms (max at On-State) | |||
| Relay commons | Isolated commons for dual relays or each pair of quad relays | |||
| Relay isolation | 250V rms working, 2.3 kV rms per 1 minute test | |||
| Relay latching modes | Latching or non-latching | |||
| Relay active modes | Active on or off, active high or low | |||
| Hysteresis modes | QA passband mode, split hysteresis, span hysteresis | |||
| Communication Boards (one optional) | ||||
| Board selections | RS232, RS485 with dual RJ11 connectors, RS485 with dual RJ45 connectors, USB, USB-to-RS485 gateway, WiFi with built-in antenna plus USB & RS485, WiFi with external antenna plus USB & RS485 | |||
| Protocols | Modbus RTU, Modbus ASCII, Modbus TCP (Ethernet), Laurel ASCII | |||
| Digital addresses | 247 (Modbus), 31 (Laurel ASCII), | |||
| Isolation | 250V rms working, 2.3 kV rms per 1 min test | |||
| Environmental | ||||
| Operating temperature | -40°C to 70°C (-40°F to 158°F) | |||
| Storage temperature. | -40°C to 85°C (-40°F to 185°F) | |||
| Relative humidity | 95% at 40°C, non-condensing | |||
| Protection | NEMA-4X (IP-65) when panel mounted | |||
| Mechanical | ||||
| Enclosure | 1/8 DIN, high impact plastic, UL 94V-0, color: black | |||
| Mounting | 1/8 DIN panel cutout required: 3.622" x 1.772" (92 mm x 45 mm). | |||
| Dimensions | 4.68" x 2.45" x 5.64" (119 mm x 62 mm x 143 mm) (W x H x D) | |||
| Maximum panel thickness | 4.5 mm (0.18") | |||
| Tightening Torque - Connectors | Screw terminal connectors: 5 lb-in (0.56 Nm) | |||
| Tightening Torque - Pawls | Digital Panel Meter Case Pawls: 5 lb-in (0.56 Nm) | |||
| Weight of base meter | 210 g (7.4 oz) typical (DPM, counter, timer, 6-digit remote display) | |||
| Weight of option boards | 30 g (1.0 oz) typical per board (analog output, relay output, communications) | |||
| Replacement Case Screws | ||||
| Size | 6 | |||
| Thread Pitch | 6-19 | |||
| Length | 1/2" | |||
| Head Style | Pan Head | |||
| Drive Style | Phillips | |||
| Head Diameter | 0.256-0.270 | |||
| Head Height | 0.087-0.097 | |||
| Full/Partial Thread | Full | |||
| Drive Size | 2 | |||
| Material | Steel | |||
| Finished | Black Oxide | |||
| General | ||||
| Programming Methods | Four front panel buttons or via Laurel's free Instrument Setup Software, which runs on a PC under MS Windows. | |||
| Security | Lockout options include using the front panel buttons, Laurel's free Instrument Setup Software, or a hardware jumper. | |||
| Warranty | 3 years parts & labor | |||
| Recalibration: All ranges are calibrated at the factory. Recalibration is recommended every 12 months. | ||||
Transmitter Pinout
Free Instrument Setup Software for Series 2 Laureates
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| 1/8 DIN Digital Panel Meters | DIN Rail Transmitters |
Free Downloadable Windows-based Instrument Setup (IS) software (Data Interface Board Required) for use with our programmable Digital Panel Meters, Scale Meters, Counters, Timers, Remote Displays, and Transmitters, are an easy method to set up Laureate 1/8 DIN digital panel meters, counters, timers, remote displays, and DIN-rail transmitters, as explained in the Instrument Setup Software Manual. Laureate 1/8 DIN instruments can also be set up from the front panel, as explained in their respective Owners Manuals. Instrument Setup software is of benefit whether or not the PC is connected to the instrument.
- When the PC is connected to the instrument, Instrument Setup software can retrieve the setup file from the instrument or open a default setup file or previously saved setup file from disk View Setup, then provides graphical user interface (GUI) screens with pull-down menus applicable to input, display, scaling, filtering, alarms, communications, analog output, and front panel lockouts. Fields that are not applicable to the instrument as configured are either left out or grayed out. Clicking on any item will bring up a detailed Help screen for that item. After editing, the setup file can be downloaded, uploaded to the instrument, or saved to a disk. The same setup file can then be downloaded into multiple instruments.
- When the PC is not connected to the instrument, the above GUI screens can be used to set up a virtual instrument. The setup file can then be saved to disk. Switching toView Menu then brings up a screen with the required front panel programming steps. This view can be printed out for use at the instrument site and to serve as a hard copy record.
Download Free Instrument Setup Software
Installation
Set User Account Control (UAC) of MS Windows to "Never notifiy me" so that Instrument Setup Software can create directories. The UAC change screen can be reached as follows:
- Under Windows 7, click on the Windows Start button in the lower left of the desktop and enter "UAC" in the search field.
- Under Windows 8, navigate to Control Panel, then to the "User Accounts and Family Safety" section, and click on "Change User Account Control Settings."
- Under Windows 10, click on the Windows Start button in the lower left of the desktop, then on "Settings", and enter "UAC" in the search field.
- Reboot your computer for the changed UAC setting to take effect.
RJ11-to-DB9 cable with rear view of DB9 connector to PC
RS232 cable, meter to PC, P/N CBL01
Laureate 1/8 DIN Laureate instruments must be equipped with a serial communications board and be connected to the computer via a serial communications cable. The connection can be via RS232, RS485, USB or Ethernet. Following setup, the serial communications board may be removed from the instrument if desired. The wiring of the RS232 cable is illustrated above with end views of the two connectors.
Laureate LT Series transmitters come standard with a 3-wire serial interface, which can be jumpered for RS232 or RS485.
Laureate LTE Series transmitters come standard with an Ethernet interface.
Meter Setup Screens
Click on any of the reduced screens below for a full-size screen view, then click on the Back button of your browser to return to this page. The screens examples below are for a fully-loaded Series 2 Digital Panel Meter (DPM), which is connected to the PC via RS232. If the meter is a Series 1 meter (pre-2007), this is sensed by the software, and somewhat different screens are brought up. Please see Series 1 setup screens.
Welcome Screen
From the computer desktop, click on Start > Programs > IS2 > IS2. Or click on the IS icon on your desktop. This splash screen will be displayed for three seconds. The software revision number is in the lower right.
Communications Selection Screen
Specify your desired communication protocol and the serial communications bus type, which should match the jumper setup of the instrument. Select None if the PC is not connected to the instrument.
Establish Communications Screen
If you selected RS-232, you will be asked to specify the PC Com Port and Baud Rate, which should match the jumper setup of the instrument. Click on Establish. With the right settings, the Communications Established field will light up in green, and the Meter Type will be recognized. If so, click onMain Menu.
Main Menu Screen
Click on File > Default Setup to retrieve the default setup file from disk for your type of meter. Click on File > Open Setupto retrieve a previously saved setup file from disk or on File > Save Setup to save your edited setup file to disk. Click onDPM > Get Setup to retrieve the setup file from your meter or on DPM > Put Setup to download your edited setup file into the meter.
DPM Input + Display Setup Screen
From the Main Menu, click on View > Setup, then on theInput+Display tab. You can now specify the meter hardware, signal type, display mode, and functions of control inputs A and B. Clicking on any item brings up a pull-down menu with the available choices.
DPM Scaling Setup Screen
Click on the Scaling tab, which provides three scaling methods to relate the signal to the displayed reading: 1) Scale and Offset method, 2) Coordinates of two points method, and 3) Reading Coordinates of Two Points method. The last method uses actual high and low signals, and the computer will prompt you.
DPM Filter Setup Screen
Click on the Filter tab, which allows you to specify the digital filter time constant (if any), the adaptive filter threshold, and whether Peak / Valley values are filtered or unfiltered. As for all setup screens, clicking on the F1 key while an item is highlighted brings up a Help screen for that item, as illustrated.
DPM Relay Alarms Setup Screen
Click on the Relay Alarms tab, which allows you to set up Alarms 1 and 2 for the optional dual relay output board. Clicking on any of the four numeric fields changes these to green and brings up a special field to enter the desired numeric value, which is tied to the displayed reading.
DPM Communications Setup Screen
Click on the Communications tab so set up serial communications. In particular, you can special the Serial Protocol and the meter address if multiple meters are to be addressed on the same serial data line.
DPM Analog Output Setup Screen
Click on the Analog Out tab so set up the optional analog output board. Three output ranges are selectable, the endpoints of which can be tied to user-specified High and Low readings.
DPM Lockouts Setup Screen
Click on the Lockouts tab to check off menu items which will no longer be accessible from the front panel of the meter. This will simplify meter operation and prevent unintended setup changes.
Meter Setup Utilities
DPM Front Panel Setup Screen
As an aid to programming the meter from the front panel when a serial connection is not available, you can return to the Main Menu and click on View > Menu. The required sequence of front panel screens will then be displayed. Click on any step in the sequence for the meaning of each digit, as illustrated for the FILtEr step. For a hardcopy, simply press on Print.
DPM Jumper Setup Screen
Specify your desired communication protocol and the serial communications bus type, which should match the jumper setup of the instrument. Select None if the PC is not connected to the instrument.
DPM Jumper Setup Screens
Click on any of the displayed plug-in boards, and you will be presented with the jumper positions and electrical connections for your selected board. This minimizes the need to refer to the printed manual.
DPM Commands Screen
This page allows you set up external input, serial communications, an analog output proportional to the display (optional), and lockouts for Laureate digital counters. The grayed out area at the top right of the screen applies to Laureate remote displays.
Graphical Output Screens (not available with Ethernet)
From the Main Menu, click on Readings if your PC is connected to the meter. A pull-down menu then offers three choices: List, Plot and Graph.
- List presents the latest readings in a 20-row by 10-column table. Press Pause at any time to freeze the display. This is one method to capture peak readings.
- Plot generates a plot of readings vs. time in seconds. It effectively turns the DPM-PC combination into a printing digital oscilloscope.
- Graph generates a histogram where the horizontal axis is the reading and the vertical axis is the number of occurrences of readings. The display continually resizes itself as the number of readings increases.
DPM Calibration Screens
Click on the Scaling tab, which provides three scalClick on the Scaling tab, which provides three scaling methods to relate the signal to the displayed reading: 1) Scale and Offset method, 2) Coordinates of two points method, and 3) Reading Coordinates of Two Points method. The last method uses actual high and low signals, and the computer will prompt you.
Frequency Meter Calibration Screen
Calibration of the quartz crystal of the Laureate frequency meter requires the input of a known frequency from a calibrator. Apply the frequency, then enter the frequency in Hertz. Calibration will be automatic, with storage of the calibration factor stored in non-volatile memory.
Dimensions
Dimensioned CAD assembly drawings in EPRT, STEP, x_t, .dwg, pdf file formats: Laureate-transmitter-case.zip (zipping prevents browser from opening CAD files as text files).
CAL-Analog
Certificate of Calibration
$65.00
CBL02
USB-to-RS232 Adapter Cable
$47.00
CBL04
RS232 Cable for LT Transmitters
$47.00CBL12
12-foot Power Cable
$47.00CBL6
6-foot Power Cable
$41.00Understanding the LTE Series DIN Rail Analog Transmitter with
Ethernet Communication for Weighing Applications
In the realm of industrial automation and process control, precise measurement and communication are crucial for ensuring efficiency and accuracy. One of the key components that enable this is the LTE Series DIN Rail Analog Transmitter with Ethernet Communication and Analog Outputs. This device is particularly beneficial for weighing applications, where it plays a vital role in converting, transmitting, and managing data from weight sensors or load cells.
What Is the LTE Series DIN Rail Analog Transmitter?
The LTE Series DIN Rail Analog Transmitter is a specialized device designed to convert analog signals from sensors, like load cells, into digital or analog outputs that can be easily transmitted and processed. This device is typically mounted on a DIN rail, a standardized metal rail used to secure and organize control equipment in industrial settings. The LTE Series refers to a specific line of transmitters optimized for various industrial applications, including weighing, known for its reliability, precision, and ease of integration into existing control systems.
Key Features
- DIN Rail Mounting: A standardized method of installing industrial devices, ensuring the transmitter is easily integrated into control panels, saving space and simplifying wiring and maintenance.
- Analog Inputs and Outputs: The transmitter accepts analog input signals from sensors such as load cells, typically in the form of millivolt signals, which it then conditions and amplifies. It can also provide analog outputs used to interface with PLCs or display units.
- Ethernet Communication: The transmitter communicates via Ethernet, allowing seamless integration into modern industrial networks for remote monitoring, data logging, and control, with faster data transmission than traditional serial connections.
- High Accuracy and Stability: Designed to deliver high accuracy and stability, ensuring weight measurements remain reliable and consistent over time — critical where even slight inaccuracies can lead to significant errors in process control or product quality.
- Scalability and Flexibility: Suitable for both small-scale applications and large industrial systems, with multiple analog and Ethernet outputs supporting easy integration or expansion.
Applications in Weighing Systems
Weighing systems are essential in various industries, from manufacturing and logistics to food processing and pharmaceuticals. The transmitter plays a crucial role in these systems by ensuring that weight data is accurately captured, transmitted, and processed.
- Batch Weighing — in industries such as food processing, accurate batch weighing is essential for maintaining product consistency and quality; the transmitter ensures weight data from load cells is accurately converted and transmitted to the control system for precise batching control.
- Tension Measurement — in applications where material tension needs to be monitored, such as textile manufacturing, the transmitter can accurately measure tension force using load cells and provide real-time data to the control system.
- Inventory Management — in warehouses and storage facilities, the transmitter can be integrated into weighing scales to ensure precise measurement of goods, with data transmitted via Ethernet for centralized monitoring and control.
Where Is This Transmitter Used?
Manufacturing and Production Lines
In manufacturing environments handling bulk materials, the transmitter is typically integrated into weighing systems on production lines, converting the weight signal from a load cell into a standardized analog or digital output. Ethernet communication ensures this data can be seamlessly transmitted to a central control system or PLC, enabling real-time monitoring and adjustments — vital for maintaining product quality and consistency in food processing, pharmaceuticals, and chemicals.
Automated Packaging Systems
Automated packaging systems often require precise weight measurements to ensure each package contains the correct amount of product. By transmitting weight data directly to the control system via Ethernet, the transmitter allows for rapid adjustments to the packaging process, minimizing waste and ensuring compliance with industry standards.
Inventory Management Systems
In warehouses and distribution centers, the transmitter can be used with weighing scales to monitor the weight of goods as they move in and out of storage, with Ethernet communication enabling real-time data integration with inventory management software for better stock tracking.
Process Control in Chemical and Pharmaceutical Industries
Precise dosing and mixing of materials are critical in these industries. The transmitter can be integrated into systems that monitor the weight of ingredients as they're added to a batch, with its analog outputs providing feedback to the process control system and Ethernet communication facilitating transmission to a central database for analysis and optimization.
Agricultural Applications
In agriculture, weighing systems are often used to monitor livestock feed intake, measure crop yields, or manage the distribution of fertilizers and pesticides. Ethernet connectivity allows integration with farm management systems, enabling data-driven decisions that improve operational efficiency and productivity.
Remote Monitoring and Data Logging
In remote or harsh environments where direct access to equipment may be limited, the transmitter's Ethernet communication capability allows transmission of weight data over long distances to a central monitoring station — especially useful for remote silos, grain storage facilities, or mining operations where continuous monitoring is necessary but physical access may be challenging.
Advantages of Using This Transmitter
- Improved Data Integrity: Ethernet communication ensures data transmitted from the transmitter is less susceptible to noise and interference, resulting in more reliable data transfer.
- Remote Monitoring and Control: Ethernet connectivity lets operators monitor and control the weighing process remotely, improving operational efficiency and reducing the need for on-site personnel.
- Easy Integration: Standardized DIN rail mounting and versatile analog outputs make integration into existing systems straightforward, reducing installation time and cost.
- Cost-Effective: Providing both analog and digital outputs eliminates the need for additional signal converters, reducing overall system costs.
Conclusion
The LTE Series DIN Rail Analog Transmitter with Ethernet Communication and Analog Outputs is a powerful and versatile tool for weighing applications. Its ability to accurately convert and transmit weight data, combined with its robust construction and ease of integration, makes it an ideal choice for industries requiring precise measurement and control — whether in batch processing, inventory management, tension measurement, agriculture, or remote monitoring, this transmitter offers the reliability and flexibility needed for efficient, data-driven, and accurate operations.
LTE Weighing Transmitter Frequently Asked Questions
What's the difference between this transmitter and the standard LTE load cell transmitter?
This transmitter uses special firmware tailored specifically for weighing applications — features like count-by rounding, gross/net toggling, and relay setpoint offset — while the standard load cell transmitter is a more general-purpose signal conditioner without those weighing-specific functions.
What is relay setpoint offset, and why would I use it?
Relay setpoint offset compensates for a known delay or overshoot in the physical process being controlled. For example, if a filling valve dispenses an extra 2.5 lbs of material after the shut-off signal, entering a -2.5 lb offset lets the setpoint stay at the true target weight while the relay itself trips earlier, so the batch lands on target rather than over it.
What does the count-by function do?
Count-by rounds the displayed and transmitted reading to a chosen increment — 1, 2, 5, 10, 20, 50, or 100 — rather than showing the raw unrounded count.
Why would I need a fixed right-hand dummy zero?
Shifting the display to a fixed right-hand zero extends the displayable range up to 999,990, at the cost of not being able to show a decimal point — useful for applications where weighed values are large enough that the standard ±99,999 range isn't sufficient.
What does the auto-zero function actually correct for?
Auto-zero compensates for load cell drift by automatically re-zeroing the reading whenever it settles within a programmed limit (0 to 9 counts) of zero. Setting the limit to 0 disables the function.
Does the Ethernet interface affect measurement accuracy or update rate?
No — accuracy (0.01% FS ±2 counts) and update rate (up to 50 or 60 conversions per second) come from the Concurrent Slope signal conditioning, identical to the serial LT Series; Ethernet only changes how the reading is transmitted digitally.
How many load cells can this transmitter's excitation output support?
The built-in 10V, 120 mA excitation supply can power up to four 350-ohm load cells wired in parallel.
What's the difference between gross and net weight modes?
Gross weight reflects the total measured weight including any container or fixture; net weight subtracts a stored tare value to show only the weight of added material. The transmitter can toggle between the two.
Can multiple LTE weighing transmitters be networked together?
Yes — the transmitter supports up to 247 digital addresses via Modbus TCP, allowing many individually addressable units to coexist on the same Ethernet network.
If I don't need the weighing-specific firmware, what should I use instead?
For general load cell signal conditioning without the weighing-specific display and setpoint features, the standard LTE load cell transmitter is the more appropriate choice; for ratiometric process signals more broadly, the LTE process transmitter is the alternative.
LTE Weighing Transmitter Questions From the Field
My scale reads correctly right after taring but drifts off over the course of a shift — what should I check?
Gradual drift over hours is commonly linked to temperature changes affecting the load cell or its cabling; enabling or tightening the auto-zero limit is often the first practical fix.
My batching system consistently overshoots the target weight by a small, repeatable amount — what's the likely cause?
A consistent, repeatable overshoot points to physical dispensing lag rather than a measurement error; this is the specific case the relay setpoint offset function is designed to correct.
My transmitter isn't showing up on the network — what should I check first?
Confirming the transmitter's IP configuration matches what the network expects, and that the physical Ethernet cable and switch port are functioning, are the standard first checks.
One of four parallel load cells seems to be dragging down my total reading — how do I isolate it?
The standard approach is disconnecting and testing each load cell individually against a known reference weight before reconnecting it, since a single mismatched-sensitivity or faulty cell can skew the averaged reading in a way that's hard to isolate once summed.
My displayed weight doesn't match a known reference weight even after calibration — what's the next step?
Re-verifying the two-point calibration is the first step — confirming the LO IN reading was captured with genuinely zero weight, and the HI IN reading with an accurately known reference weight, since an error in either point offsets every reading afterward.
My Modbus TCP polling occasionally times out even though the transmitter appears connected — what's the likely cause?
Network congestion or too many devices polling the same transmitter simultaneously can cause intermittent timeouts; checking polling frequency and network traffic load is a common first step.
Why would switching from 4-wire to 6-wire load cell wiring change my calibration results?
6-wire wiring changes how the transmitter compensates for lead resistance compared to 4-wire, so a calibration performed under one configuration doesn't necessarily carry over after switching; recalibrating after any wiring change is recommended.
My reading is unstable specifically near conveyor motors or other heavy equipment — why?
Motors and variable-frequency drives are well-documented sources of electrical noise that can couple into load cell wiring; checking cable shielding, grounding, and physical separation from the noise source is the standard remedy.
