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Connecting
5.1
Basic safety instructions
Maximum cable length exceeded for devices with type of protection "Intrinsic safety Ex
i"
Risk of explosion in hazardous areas.
To meet the requirements of devices with intrinsic safety "Ex i" type of protection, observe the
maximum permissible cable length in section Technical specifications (Page 29).
Unsuitable cables, cable glands and/or plugs
Risk of explosion in hazardous areas.
• Use only cable glands/plugs that comply with the requirements for the relevant type of
• Tighten the cable glands in accordance with the torques specified in Technical specifications
• Close unused cable inlets for the electrical connections.
• When replacing cable, glands use only cable glands of the same type.
• After installation, check that the cables are seated firmly.
Improper power supply
Risk 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
• Always power the device with limited energy. Observe the following standards on limited
SITRANS LH300 Transmitter for Hydrostatic Level
Compact Operating Instructions, 11/2022, A5E37897183-AD
WARNING
WARNING
protection.
(Page 29).
WARNING
relevant specifications can be found in the certificates, in Chapter "Technical specifications
(Page 29)" or on the nameplate.
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.
5
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