Nivotester FTL325P Repair and error handling
Endress+Hauser 29
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. Wait for the demand mode to be finished
The demand mode is finished 10 s after the test button is released.
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.
6.6 Verification criterion
If one of the test criteria from the test sequences described above is not fulfilled, the
device may no longer be used as part of a safety instrumented system.
• The purpose of proof-testing is to detect dangerous undetected device failures (λ
DU
).
• This test does not cover the impact of systematic faults on the safety function, which must
be assessed separately.
• Systematic faults can be caused, for example, by process material properties, operating
conditions, build-up or corrosion.
• As part of the visual inspection, for example, ensure that all of the seals and cable entries
provide adequate sealing and that the device is not visibly damaged.
7 Repair and error handling
7.1 Maintenance
Maintenance instructions and instructions regarding recalibration may be found in the
Operating Instructions pertaining to the device.
Alternative monitoring measures must be taken to ensure process safety during
configuration, proof-testing and maintenance work on the device.
7.2 Repair
Repair means restoring functional integrity by replacing defective components.
Components may be repaired/replaced by the customer's technical staff if genuine spare
parts from Endress+Hauser are used (they can be ordered by the end user) and the
appropriate installation instructions are followed.
A proof test must always be performed after every repair
To Next Page
Loading...
