KROHNE OPTITEMP TCA Ex EN - Manual (Page 26)

4
ELECTRICAL CONNECTIONS
26
OPTITEMP TRA/TCA
www.krohne.com 10/2010 - 4001087001 - Ex AD OPTITEMP TRA/TCA R02 en
Electrical connections
4.1 General notes
Industrial thermometers are connected to an electricity supply by connecting the sensor circuit
in the connection head to the interchangeable measuring insert.
4.2 Power supply
The supply voltage of an industrial thermometer specifically refers to the supply voltage of the
measuring insert (for further information refer to
Electrical data on page 20).
DANGER!
In order to prevent injury and material damage, always take heed of the information about
temperatures at the process connection before connecting an industrial thermometer to an
electricity supply ( on page 18). In addition, always observe the following points:
• Ensure that all connecting cables conform to the valid installation standards (e.g. EN 60079-
14) and withstand the maximum operating temperature.
• Adjust the outer diameter of the connecting cables to the sealing range of the cable entries.
• Securely lay the connecting cables and sufficiently protect them against damage.
• Securely connect all the cores not in use with the ground potential of the explosive area or
carefully insulate them from each other and from ground (test voltage ≥ 500V
eff
).
DANGER!
Also refer to the transmitter's Ex manual for all industrial thermometers with an explosion-
proof transmitter.
DANGER!
If you are operating the measuring insert together with a transmitter, pay attention to the details
of the power supply in the Ex documentation of the transmitter used. Also observe the maximum
values of the sensor circuit.
.book Page 26 Friday, November 19, 2010 2:23 PM