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5
Connecting
5.1
Basic safety instructions
WARNING
Unsuitable cables and/or cable glands
Danger of explosion in hazardous areas.
● Only use suitable cables and cable glands complying with the requirements specified in Chapter "Technical data
(Page 35)".
● Tighten the cable glands in accordance with the torques specified in Chapter "Technical data (Page 35)".
● When replacing cable glands use only cable glands of the same type.
● After installation check that the cables are seated firmly.
WARNING
Improper power supply
Danger of explosion in hazardous areas and loss of device safety as a result of incorrect power supply, e.g. using direct
current instead of alternating current.
● Connect the device in accordance with the specified power supply and signal circuits. The relevant specifications can
be found in the certificates, in Chapter "Technical specifications (Page 35)" or on the nameplate.
● Always power the device with limited energy. Observe the following standards on limited energy: UL61010-1 3rd
Edition, Section 9.3 or LPS (Low Power Supply) in accordance with UL60950-1 or Class 2 in accordance with UL1310
or UL1585.
WARNING
Unsafe extra-low voltage
Danger of explosion in hazardous areas due to voltage flashover.
● Connect the device to an extra-low voltage with safe isolation (SELV).
WARNING
Lack of equipotential bonding
Danger of explosion through compensating currents or ignition currents through lack of equipotential bonding.
● Ensure that the device is potentially equalized.
Exception: It may be permissible to omit connection of the equipotential bonding for devices with type of protection
"Intrinsic safety Ex i".
WARNING
Unprotected cable ends
Danger of explosion through unprotected cable ends in hazardous areas.
● Protect unused cable ends in accordance with IEC/EN 60079-14.
WARNING
Connecting device in energized state
Danger of explosion in hazardous areas.
● Connect devices in hazardous areas only in a de-energized state.
Exceptions:
● Circuits of limited energy may also be connected in the energized state in hazardous areas.
● Exceptions for type of protection "Non-sparking nA" (Zone 2) are regulated in the relevant certificate
SITRANS LH100 (7MF1572..) Transmitter for hydrostatic level
A5E32588610-02, 02/2014
31
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