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6. Commissioning, operation
6.2 Making the electrical connection
The instrument must be earthed via the process connection.
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The power supply for the pressure transmitter must be made via an energy-limited electrical circuit per
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EN
UL/EN/IEC 61010-1 or an LPS to UL/EN/IEC 60950-1 or class 2 per UL1310/UL1585 (NEC or CEC). The
power supply must be suitable for operation above 2,000 m should the pressure transmitter be used at this
altitude.
Only ever use a power source that ensures a safe electrical isolation of the operating voltage in accordance
■
with IEC/DIN EN 60204-1. In addition, observe the general requirements for PELV circuits in accordance
with IEC/DIN EN 60204-1. Switching power supply units are permissible, if they ensure a safe isolation as
defined by IEC/EN 60950-1.
Long signal lines reduce the immunity to interference. Ensure that the length of the signal cable is always
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shorter than 30 m. In this way you can avoid non−operate currents caused by electromagnetic interference.
Electrical connection
Description
2-wire
Model:
SPTW-. ... A
3-wire
Model:
SPTW-. ... VD
Ingress protection per IEC 60529
6.3 Functional check
The output signal must be proportional to the prevailing pressure. If this is not the case, this may
indicate a damaged diaphragm. In this case, see chapter „8. Faults".
12
Circular connector M12 x 1, 4-pin
U
= 1
B
0V = 3
U
= 1
B
0V = 3
Out = 4
IP 67
The stated ingress protection only applies when plugged in using mating connectors
that have the appropriate ingress protection.
3
4
2
1
Pressure transmitter SPTW
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