Endress+Hauser Liquiphant S FDL60, Functional Safety Manual

Page: 9 / 24

Liquiphant S, Nivotester
Hauser 9
Behavior of device during
operation and in case of error Behavior of device during power-up
Once a device has powered up, the output signal can be regarded as safe after 10 seconds.
The fail-safe contact is open during this time.
After this, the device is in normal operation and shows the status of the tuning fork (free/covered).
Behavior of device on demand
Once the level limit to be monitored is reached, the fail-safe contact changes from closed to open within the
system reaction time.
Behavior of device in the event of of faults
Fail-safe contact
The fail-safe contact is open in the event of faults.
Alarm relay
The alarm relay changes to idle condition in the event of faults.
The type of fault is also indicated by an LED on the Nivotester; see Operating Instructions (
→
ä
6,
"Supplementary device documentation").
!
Note!
This signaling is simply an additional piece of diagnostic information and does not form part of the safety-related
output signal.