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266CRH / 266CRT, 266CSH / 266CST MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A
Electrical connections
Safety instructions for electrical installation
DANGER
Explosion hazard
Improper installation and commissioning of the device carries
a risk of explosion.
•
For use in potentially explosive atmospheres, observe the
information in Use in potentially explosive atmospheres
on page 6!
DANGER
Explosion hazard
If the type of protection specified on the certification plate
does not agree with the requirements imposed on the
implementation site, explosions or fires can be triggered.
•
In this case the transmitter must NOT be connected
electrically.
WARNING
Risk of injury due to live parts.
Improper work on the electrical connections can result in
electric shock.
•
Connect the device only with the power supply switched
off.
•
Observe the applicable standards and regulations for the
electrical connection.
NOTICE
Damage to components!
The electronic components of the printed circuit board can be
damaged by static electricity (observe ESD guidelines).
•
Make sure that the static electricity in your body is
discharged before touching electronic components.
The electrical connection may only be established by authorized
specialist personnel and in accordance with the connection
diagrams.
The electrical connection information in this manual must be
observed; otherwise, the IP rating may be adversely affected.
Ground the measurement system according to requirements.
General
The relevant directives must be complied with for the electrical
installation!
Because the transmitter cannot be switched off, surge
protection devices, lightning protection, or grid disconnect
possibilities must be provided at the plant.
Check that the existing supply voltage corresponds to that
indicated on the rating plate. The same lines are used for both
the power supply and the output signal.
If an optional surge protector is provided and if the transmitter
is used in a hazardous area, energy must only be supplied via a
voltage source with electrical isolation from the grid. Because
the inherently safe power circuits of the transmitter are
grounded, a sufficient equipotential bonding must be ensured
for the entire supply line.
Installing the connecting cables
Ensure that a drip loop (water trap) is used when installing the
connecting cables for the sensor.
If necessary, rotate the transmitter housing accordingly.
1 Drip loop
Figure 23: Installing the connecting cables
1
1
M11186
31
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