Introduction

4-channel input terminal, thermocouple, high-precision, electrically isolated

The EL3314-0002 analog input terminal allows the direct connection of four thermocouples in 2-wire configuration. The channels are electrically isolated from each other and from the E-bus, thus preventing adverse effects and damage due to cross currents. Various types of thermocouple are supported; the conversion of the voltage to temperature is already carried out within the terminal. Wire break is signaled by error LEDs and on the fieldbus. The cold junction compensation is carried out by an internal precise temperature measurement at the connection terminals; however, operation with an external cold junction or voltage measurement without cold junction calculation is also possible.

For high-precision measurements please note the following:

• Before delivery the terminal is calibrated against a high-precision reference voltage.
• The terminal is set by default to 0.01 °C/digit "high resolution".
• The assured accuracy applies to the following settings:
• 50 Hz filter
• 23 ± 5 °C ambient temperature
• horizontal installation position
• In addition it has the following features:
• An additional software-based "MC filter" can be used for smoothing the measured value.
• External cold junction compensation is possible.
• We advise against the use of compensation wires, because they reduce the measuring accuracy of the terminal.
• We recommend using thermocouples with suitable accuracy.