Safety Instructions; Intended Application; Mounting, Commissioning, Operation; Operational Safety - Endress+Hauser FEL 50 A Operating Instructions Manual

1 Safety instructions

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1 Safety instructions
1.1

Intended application

The Liquiphant M FTL 50 (H)/51 (H)/51 C and Liquiphant S (HT*), FTL 70/71 with
electronic insert FEL 50 A may only be used as a limit switch for liquids.
Other applications are not permitted. They may violate the appropriate regulations,
particularly in explosion-hazardous areas.
1.2 Mounting, start-up, operation
The Liquiphant M and Liquiphant S (HT) with electronic insert FEL 50 A is built to the
state-of-the-art and to be fail-safe and meets the appropriate rules and EC directives.
However, if you use it improperly or other than for its designated use, it may pose
application-specific hazards, e.g. product overflow through incorrect mounting or
configuration. Mounting, electrical connection, start-up, operation and maintenance of
the measuring device must therefore be carried out exclusively by trained specialists
authorised by the system operator. Technical personnel must have read and understood
these operating instructions and must adhere to them. You may only undertake
modifications or repair work to the device when it is expressly permitted by the
operating manual.
1.3

Operational safety

Explosion-hazardous area
When using the measuring system in explosion-hazardous areas, you must keep to the
appropriate national standards. The device possesses separate Ex documents
(XA 154F, XA 158F, XA 159F) which form a component part of this documentation.
Always follow the mounting regulations, connection data and safety instructions
therein.
• Make sure that the specialist personnel have received sufficient training.
• Always keep to the measuring and safety conditions at the measuring points.
* HT = High temperature
Liquiphant M/S (HT), FEL 50 A PROFIBUS PA
Endress+Hauser