Liquiphant M/S with electronic insert FEL58 + Nivotester FTL325N
Hauser
19
Safety function
Definition of the safety
function
The measuring system's safety functions are:
• Maximum point level monitoring (overfill protection)
• Minimum point level monitoring (dry run protection)
For information on the choice of operating mode (MIN or MAX detection), see → 22.
Restrictions for use in safety-
related applications
• The measuring system must be used correctly for the specific application, taken 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 from the Operating Instructions must not be exceeded, → 15.
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.
L
CAUTION
Gas density is exceeded!
"Free" state is not detected and "Covered" is always signaled.
‣
The gas density may not be exceeded.
