Failsafe; Chemical Compatibility - Siemens sitrans PROBE LU Instruction Manual

Failsafe

The Failsafe function can be activated either if there is not a valid measurement, or by
one of the faults marked by an asterisk in the table
Failsafe mode, the device will output one of the four options determined by P071 (Failsafe
Material Level).
Failsafe Mode P071
1 = HI
2 = LO
3 = HOLd
4 = SEL
If an invalid measurement is generated by the application (for example, material level
outside threshold settings), the Failsafe timer (P070) will control the speed of the Failsafe
response. When the Failsafe timer expires, the device outputs the value selected in P071.
If a valid measurement is received before the timer expires, the timer will be reset.
If Failsafe mode is activated by a fault (see
instrument will go into Failsafe mode without delay.

Chemical compatibility

The plastic materials used in the construction of SITRANS Probe LU (ETFE, PBT, and
PVDF) are resistant to attack from most chemicals. For exposure to specific
environments, check with chemical compatibility charts before installing and operating
SITRANS Probe LU in your application.
7ML19985HT01 SITRANS Probe LU – INSTRUCTION MANUAL
Use Maximum mA Limit (P213) as material level
Use Minimum mA Limit (P212) as material level
Level remains at last reading
User-selected value (defined in P073)
General Fault Codes
General Fault Codes
on page 79. In
on page 79), the
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