Potential Equalization; Instrumentation; Temperature Sensor Connection Without Transmitter - ABB SensyTemp TSP serie Inbetriebnahmeanleitung

Electrical connection
4.1.6

Potential equalization

The temperature sensors must be integrated in the potential equalization of the installation
location. They may be ground isolated or connected at one location to the potential equalization
system of the instrinsically safe circuits of the installation location.
Thermocouples may be grounded if they are welded into the ground. If the temperature sensors
do not fulfill the 500 V AC voltage test, 1 minute, leakage current < 5 mA, then these
temperature sensors are labeld with "Voltage test less than 500 V". Here, a connection to
ground is to be assumed.
Fig. 4
4.1.7

Instrumentation

The power supplies and the IEC fuses for operation of the temperature sensors with and without
installed temperature transmitter must be located outside of the explosion risk area.
4.2

Temperature sensor connection without transmitter

It must be ensured with this instrumentation that the power feed occurs using an approved
intrinsically safe electrical circuit of the category EEx ia IIC or II B or via an IEC fuse with a
nominal current of ≤ 32 mA. The electrical and thermal parameters may not be exceeded, see
chapter "Thermal data" in the operating instructions.
Note
For use of double measurement circuits (2 x Pt100, 2 x thermocouple, 2 installed transmitters
in the connection head), the sum of the voltages, currents and power may not exceed the
electrical and thermal parameters. See chapter "Thermal data" in the operating instructions.
14 - EN SensyTemp TSP CI/TSP-X1