Fail-Safe Mode; Temperature De-Rating - Siemens SITRANS LR560 Operating Instructions Manual

A.4.4

Fail-safe Mode

The purpose of the Fail-safe setting is to put the process into a safe mode of operation in the
event of a fault or failure. The value to be reported in the event of a fault is selected so that a
loss of power or loss of signal triggers the same response as an unsafe level.
TIMER (2.5.2.) (Page 116) determines the length of time a Loss of Echo (LOE) condition will
persist before a Fail-safe state is activated. The default setting is 100 seconds.
MATERIAL LEVEL (2.5.1.) (Page 116) determines the material level to be reported when TIMER
(2.5.2.) (Page 116) expires.
Options
Upon receiving a reliable echo, the loss of echo condition is aborted, the Service Required icon
and error message are cleared, and the reading and mA output return to the current material
level.
A.5

Temperature De-Rating

SITRANS LR560 (mA/HART)
Operating Instructions, 06/2017, A5E34647946-AD
STANDARD DEVICE
HI 20.5 mA (max. mA Limit)
LO 3.8 mA (min. mA Limit)
HOLD Last valid reading
Factory setting
VALUE User-selected value defined in LEVEL (2.5.3.) (Page 117)
Technical reference
A.5 Temperature De-Rating
189