Connecting - Siemens SITRANS L Operating Instructions Manual

Connecting

5.2 Connecting
Note
Shielded cable generally necessary in HART multidrop mode.
Note
If the temperatures are too high, the cable insulation can be damaged. Hence keep
apart from the ambient temperature also the self-heating of the transmitter for the
temperature resistance of the cable in the connection compartment in mind (With an
ambient temperature ≥ 50 °C (122 °F) the connection cable should be suitable for a
temperature which is at least 20 °C (36 °F) higher.).
Cable screening and grounding
It is recommended to connect the cable screening to ground potential on the supply
side.
Cable gland
Metric threads
In the case of transmitter housings with metric thread, the cable gland is screwed in
at the factory. It is sealed with plastic plugs as transport protection.
You have to remove this plug before electrical connection.
NPT thread
In the case of transmitter housings with self-sealing NPT threads, it is not possible to
have the cable entry screwed in at the factory. The cable gland is therefore covered
with a red dust protection cap as transport protection.
Note
To ensure the housing protection class, you must replace this protective cap with an
approved NPT cable gland before setup.
Note
Do not use grease when screwing in the NPT cable gland or a conduit steel pipe.
Maximum torque see chapter " Technical data".
5.2 Connecting
Connection technology
The voltage supply and signal output are connected via the spring-loaded terminals
in the housing.
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Operating Instructions, 10/2022, 62711-76-01, A5E50352155
SITRANS LR150