Siemens SITRANS L Series Operating Instructions Manual page 24

Connecting
3.1 General safety instructions
Note
Wiring diagram
The electrical connections have to be made according to the wiring diagram.
Note
Supply voltage
Compare the supply voltage applied with the specifications given on the electronic and name
plate before switching the device on.
Note
Cable gland/ closing element
The screwed cable gland and closing element must have following specifications: Ingress
protection IP67, temperature range from -40°C to +70°C, UL or VDE certified (depending on
the country where the unit is installed), pull relief.
Make sure that the screwed cable gland safely seals the cable and that it is tight (danger of
water intrusion). Cable glands that are not used have to be locked with a closing element.
Note
Conduit system
In case of using a conduit system (with NPT thread) instead of a cable gland the regulations
of the country where the unit is installed must be observed. The conduit must have a tapered
thread either NPT 1/2" or NPT 3/4" in accordance with the unit and ANSI B 1.20.1. Not used
inlets must be closed tight with a metal closing element.
Note
Field wiring cables
The diameter has to match to the clamping range of the used cable gland.
The cross section has to match with the clamping range of the connection terminals and
consider the max. current.
All field wirings must have insulation suitable for at least 250 V AC.
The temperature rating must be at least 90°C (194°F).
If higher immunity interferences as specified in the stated EMC standards are present (see
chapter approval), a shielded cable is required, otherwise an unshielded instrumentation
cable is satisfactory.
Note
Connecting the terminals
Make sure that max. 8 mm (0.31") of the pigtails are bared (danger of contact with live parts).
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Operating Instructions, 05/2019, A5E44908583-AB
SITRANS LVS300