TMT180
Wiring
Hauser
11
!
Note!
The screws on the terminals must be screwed in tightly. Head transmitter configuration during
measurement operation is possible. There is no need to disconnect cables!
4.3
Potential grounding
!
Note!
Please take note of the following when remotely installing the head transmitter in a field housing.
The shield on the output (output signal 4 to 20 mA) must be at the same potential as the shield at
the sensor connection. For an effective shielding the cable shield must be solidly connected to the
field housing. This can be achieved by connecting the cable shield to the special EMC cable gland.
4.4
Ground the Transmitter
The transmitter will operate with the current signal loop either floating or grounded. However, the
extra noise in floating systems affects many types of readout devices. If the signal appears noisy or
erratic, grounding the current signal loop at a single point may solve the problem. The best place to
ground the loop is at the negative terminal of the power supply. Do not ground the current signal
loop at more than one point.
Fig. 8:
Shielding on remote installation
Open the field housing cable gland and connect the
shield of the output and sensor connection according
to the figure opposite (see Fig. 8). In plants with strong
EMC problems shielding of all cables with a low ohm
connection to the transmitter housing is
recommended.