WIKA IPT-11 - Manual (Page 13)

5 Connecting to power supply
5 .1 Preparing the connection
Always keep in mind the following safety instructions:
l Connect only in the complete absence of line voltage
In hazardous areas you should take note of the appropriate
regulations, conformity and type approval certificates of the sensors
and power supply units.
The external indicating and adjustment unit is connected to the sensor
with standard four-wire cable with screen.
Use cable with round cross-section. A cable outer diameter of 5 … 9 mm
(0.2 … 0.35 in) ensures the seal effect of the cable gland. If you are
using cable with a different diameter or cross-section, exchange the
seal or use a suitable cable gland.
Sensors with double chamber housing can be equipped with a plug
M
12 x 1 (optional) for connection of the external indicating and
adjustment unit.
The external indicating and adjustment unit is connected to the sensor
with a screened four-wire special cable (up to 25 m length) with
connection socket M12 x 1.
PA/FF sensors with single or double chamber housing can be
equipped optionally with a 5-pole plug M12 x 1 (optional) for
connecting the external indicating and adjustment unit.
Information:
The special cable is part of the scope of delivery with PA/FF sensors
with connection plug M12 x 1 for the external indicating and
adjustment unit.
Take note of the corresponding installation regulations for Ex
applications.
Connect the cable screen on both ends to ground potential. In the
external indicating and adjustment module and in the sensor, the
screen must be connected directly to the internal ground terminal. The
ground terminal on the outside of the housing must be connected to
the potential equalisation (low impedance).
In Ex applications, one-sided grounding on the sensor is recommen-
ded, see EN 60079-14.
Note safety instructions
Take note of
safety instruc-
tions for Ex ap-
plications
Select connection cable
4
… 20 mA/HART sen-
sors
Select connection cable
PA/FF sensors
Select connec-
tion cable for Ex
applications
Cable screening and
grounding
Cable screening and
grounding for Ex appli-
cations
External indicating and adjustment unit 13
5 Connecting to power supply
31550
-
EN
-100726