Liquiphant M/S with electronic insert FEL58 + Nivotester FTL325N
30
Hauser
Version I, test sequence A, MAX detection
• Approach the level or
• Remove and immerse in a medium of similar density and viscosity
Step 1
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.
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 current at terminal 2.
The current must be between 2.2 to 3.5 mA.
If the current is outside the specified tolerance, a fault has occurred in the safety path. The
proof test has not been passed and must be aborted.
Step 2
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.
2. Check the current at terminal 2.
After immersing the fork (plus a response time of approx. 1 s), the current must be
between 0.6 to 1.0 mA.
If the current is outside the specified tolerance, 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 exposing the tuning fork.
3. Check the current at terminal 2.
After retracting the fork (plus a response time of approx. 2 s) or after the voltage is
restored (plus a response time of approx. 3 s), the current must be between 2.2 to 3.5 mA.
If the current is outside the specified tolerance, a fault has occurred in the safety path. The
proof test has not been passed and must be aborted.
