Liquiphant M/S with electronic insert FEL58 + Nivotester FTL325N
Hauser
31
Version II to VI, test sequence A, MIN detection
• Approach the level or
• Remove and immerse in a medium of similar density and viscosity
Step 1
1. Raise the level or immerse the tuning fork of the sensor that has been removed into the
medium until the tuning fork is fully covered.
If it is not possible to do this with the original medium, a medium of a similar density and
viscosity must be used.
2. Check the status of the safety contacts.
Version
Terminal
II
III
IV
V
VI
4+5
Closed
Not applicable
Closed
Closed
Closed
22+23
Not applicable
Closed
Closed
Closed
Not applicable
26+27
Not applicable
Closed
Closed
Closed
Not applicable
If one or more safety contacts are open, a fault has occurred in the safety path. The proof test
has not been passed and must be aborted.
Step 2
1. Lower the level or remove the tuning fork of the sensor that has been removed out of the
medium until the tuning fork is completely free.
2. After immersing the fork (plus a response time of approx. 1 s), check the status of the safety
contacts.
Version
Terminal
II
III
IV
V
VI
4+5
Open
Not applicable
Open
Open
Open
22+23
Not applicable
Open
Open
Open
Not applicable
26+27
Not applicable
Open
Open
Open
Not applicable
If one or more safety contacts are closed, a fault has occurred in the safety path. The proof test
has not been passed and must be aborted.
Step 3
1. Re-install the sensor that was removed.
2. Restore the GOOD state by fully covering the tuning fork.
3. After immersing the fork (plus a response time of approx. 2 s) or after the voltage is restored
(plus a response time of approx. 3 s), check the status of the safety contacts.
Version
Terminal
II
III
IV
V
VI
4+5
Closed
Not applicable
Closed
Closed
Closed
22+23
Not applicable
Closed
Closed
Closed
Not applicable
26+27
Not applicable
Closed
Closed
Closed
Not applicable
If one or more safety contacts are open, a fault has occurred in the safety path. The proof test
has not been passed and must be aborted.