Endress+Hauser iTEMP TMT125 Bedienungsanleitung Seite 31

TMT125
– We recommend that the fieldbus not be looped using conventional cable glands. If you later
replace even just one device, the bus communication will have to be interrupted.
!
Note!
• The terminals for the fieldbus connection have an integral polarity protection.
- Cable cross-section: max. 2.5 mm
• A shielded cable must be used for the connection.
Tightening torques of the screwed connection of cable glands (field housing):
The tightening torques of cap nuts depend on what type of cable is used and must therefore be
determined by the user. The cap nuts must be securely tightened. Tightening the cap nuts too
tight can have a negative effect on the protection method. The following specification should be
taken as rough guides:
Type
Temperature transmitter attached in field housing
Only permanently laid cables and lines must be inserted into the cable glands. The permissible
cable diameters can be found in the chapter 'Technical Data', in the Operating Instructions on
the CD-ROM. The operator must provide an appropriate strain-relief clamp (for example with a
suitable cable clamp). The mounting notes in → ä 26 must be observed. Cable glands that are
not in use must be closed off with a corresponding stop plug or replaced by an appropriate screw
plug. The required degree of protection (IP 67) must be observed.
!
Note!
The ambient temperature range can be restricted by the stop plug. For examples of stop plugs
and screw plugs, please refer to the respective data sheets.
!
Note!
For metal housing in hazardous areas, a suitable potential equalization in accordance with
IEC 60 079 is required. A grounding screw is provided on the housing for this purpose(, item
B). The connection must be designed to prevent self locking and must be protected against
corrosion. Protection against corrosion can also be achieved by using tinned cable plates, for
example.
!
Note!
Before closing the cover, a visual inspection must be performed to ensure that there are no
visible signs of damage on the cover seal. In the event of damage, the seal must be replaced by
an original seal. The screws on the cover should be tightened to a torque of 2.5 Nm.
Endress+Hauser
2
Cap nut
4.17 Nm
Wiring
Lower part
6.25 Nm
31