Appendix Nivotester FTL325P
32 Endress+Hauser
8.1.2 Description of application as a safety instrumented system
The sensor's tuning fork vibrates at its intrinsic frequency. The vibration frequency decreases
as the density increases. This change in the frequency causes the current signal to change.
Correct installation is a prerequisite for safe operation of the device.
8.1.3 Measurement function
Choice of operating modes:
• MIN detection
The measuring system is used to protect against a level that is too low (e.g., pump dry
running protection, protection against emptying or protection against insufficient filling).
In normal operation, the tuning fork is covered by liquid and the measuring system reports
the OK status. If the tuning fork is free, the device assumes the safe state and signals the
demand mode.
• MAX detection
The measuring system is used to protect against a level that is too high (e.g., overfill
prevention).
In normal operation, the tuning fork is not covered by liquid and the measuring system
reports the OK status. If the tuning fork is covered, the device assumes the safe state and
signals the demand mode.
8.2 Commissioning or proof test report
The following device-specific test report acts as a print/master template and can be replaced
or supplemented any time by the SmartBlue app or the customer's own SIL reporting and
testing system.
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