EL3311

EL3311 is a Beckhoff EL EtherCAT Terminal with one input for thermocouple temperature measurement. It uses 2-wire connection technology and supports a maximum cable length of 30 m, allowing the thermocouple to be installed remotely from the terminal. The default thermocouple type is K. Open-circuit recognition detects a disconnected or broken sensor circuit.

The input uses an electrical range of ±75 mV and permits a maximum differential-to-ground voltage of ±2 V. Its 16-bit internal resolution supports precise signal conversion, while the process data object resolution across the ±75 mV range is 4 µV per digit. The preset temperature resolution is 0.1ºC per digit, providing temperature values in tenths of a degree.

A separate internal cold-junction sensor is provided for the channel to compensate for the thermocouple connection temperature. Cold-junction accuracy is ±2.0ºC, and its temperature coefficient is less than 40 mK/K. The bus-side isolation is rated at 500 V, providing electrical separation between the measurement circuitry and bus. The terminal has an IP20 protection class, protecting against contact with fingers and solid objects larger than 12.5 mm but not against water.