Endress+Hauser FTL62 Series, Руководство по функциональной безопасности

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Liquiphant FTL62 with electronic insert FEL67 Design
Hauser 9
Feature: 110 "Process connection"
Version: all
Feature: 590 "Additional approval"
Version: LA
Advanced diagnostic measures are only implemented in this version. This version must be
selected for use as a safety function as per IEC 61508.
3.2 Identification marking
SIL-certified devices are marked with the SIL logo on the nameplate.
3.3 Safety function
The device's safety functions are:
• Maximum level monitoring (overfill prevention, MAX detection)
• Minimum level monitoring (dry running protection, MIN detection)
3.4 Basic conditions for use in safety-related applications
The measuring system must be used correctly for the specific application, taking into account
the medium properties and ambient conditions. Carefully follow instructions pertaining to
critical process situations and installation conditions from the Operating Instructions. The
application-specific limits must be observed. The specifications in the Operating Instructions
and the Technical Information must not be exceeded.
3.4.1 Density of the medium
Operation is only permitted with liquids:
• Depending on the configured density setting, the density of the liquid must be as follows:
• if the switch position is > 0.7 the density must be over 0.7 g/cm³ (common water- and
oil-based liquids).
• if the switch position is > 0.5 the density must be over 0.5 g/cm³ (e.g., liquefied gas,
isopentane, petroleum ether).
• The gas phase above the liquid may not exceed a maximum permitted density value. The
maximum possible gas density depends on the temperature and the device.