The ELHART EWM-D2-RS load cell transmitter is designed to convert signals from strain-gauge bridge load cells, proportional to the forces applied to them, into digital data that can be read via the RS-485 communication interface using the Modbus RTU protocol.
The EWM-D2-RS transmitter can process data at a rate up to 470 samples per second, which allows it to be used for in-motion weighing. It can calculate net weight, gross weight, the number of equal weight items on the scale, and the load level applied to the load cell. It has a digital display and buttons for on-site setup and indication of values. All setup and calibration parameters are available for reading and writing via the communication interface.
| Parameter | Value |
|---|---|
| Transmitter power supply | |
| Supply voltage | 10…30 VDC |
| Power consumption | max 3 W |
| Measuring input | |
| Type of devices connected to the measuring input | load cell (strain gauge) |
| Load cell excitation voltage | 5 VDC |
| Load cell resistance | min 87 Ω |
| Load cell sensitivity | (±2, ±4, ±8, ±16, ±32, ±64) mV/V |
| Basic error | ±0.05% of sensitivity |
| Load cell connection | 6-wire or 4-wire with jumpers |
| Input short-circuit current limit | max 80 mA |
| Communication | |
| Interface type and baud rate | RS-485, 2400 to 115200 bit/s |
| Communication protocol | Modbus RTU |
| Digital input | |
| Digital input signal types | PNP, NPN, "dry contact" |
| Permissible voltage at the digital input | 10…30 VDC |
| Environmental conditions | |
| Operating and storage temperature | -20…+50 °C |
| Relative humidity | 0 to 80% (without condensation) |
| General | |
| Mounting | DIN-rail |
| Electrical connections | built-in screw terminal blocks |
| Conductor cross-section | max 2.5 mm² |
| Indication | 4-digit 7-segment LED display 6 status LEDs |
| Weight | max 100 g |
| Ingress Protection | IP20 |
| Insulation type | double insulation |
Note. Load cell wire colors may be different from the figures.
