Endress+Hauser Nivotester FTL325P - Test Sequence A, MIN Detection; Version II and Version VI; Version III; Version IV to Version

Nivotester FTL325P Proof testing
Endress+Hauser 25
6.2 Test sequence A, MIN detection
• Approach the level or
• Remove and immerse in a medium of similar density and viscosity
The contacts to be checked depend on the version.
Version II and version VI:
Terminal 4 + 5
Version III:
• Terminal 22 + 23
• Terminal 26 + 27
Version IV and version V:
• Terminal 4 + 5
• Terminal 22 + 23
• Terminal 26 + 27
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.
 The contacts to be checked must be closed.
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 take the tuning fork of the sensor that has been removed out of the
medium until the tuning fork is completely free.
 Wait for the switching delay to elapse (1 s, unless ordered otherwise)
2. Check the status of the safety contacts.
 The contacts to be checked must be open.
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 (optional).
 Wait for power-up (10 s).
2. Restore the status OK by fully covering the tuning fork.
 Wait for the switching delay to elapse (1 s, unless ordered otherwise).