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PRE-STARTUP ACCEPTANCE TEST
After the installation of the device in order to validate the
required safety functionality of the system together with the
target equipment according to the Safety Requirement
Specification a Pre-Startup Acceptance test shall be performed
as following:
1. Put the Write Protect Mode switch in operating position
2. Power-on the transmitter: the transmitter performs
automatically a self-test that consists in the operations
below:
- Switch-on of the Secondary output
- Test of the analog output stage and of the feedback A/D
converter
In case the first condition wouldn't happen, the transmitter shall
be considered failed and not possible to use. In case the
second test would fail the transmitter will drive the output to the
selected alarm status. In this case a correction action consists
in the re-calibration of the A/D converter. After the correction
action the pre-startup test shall be repeated.
3. Put the Write Protect Mode switch in Write Enable condition.
4. Perform the Hart Command "Change Transmitter status to
Maintenance"
5. Perform the Hart Command "Clock monitor test". The
transmitter simulates a clock failure and put the output to
Up-scale by the supplementary output stage. In case this
condition wouldn't happen, the transmitter shall be
considered failed and not possible to use.
6. Power-off the transmitter
7. Put the Operating/maintenance switch in operating condition
8. Power-on the transmitter.
A pre-startup acceptance test report shall be produced to
record the test results.
PROOF TESTS
Safe undetected faults could occur during the operation of the
transmitters. These failures do not affect the transmitter
operations. To maintain the claimed Safety Integrity Level
(SIL 2) a proof test procedure is requested every 1 year.
The proof tests consists in the following operations:
1. Put the Write Protect Mode switch in Write Enable condition.
2. Perform the Hart Command "Change Transmitter status to
Maintenance"
3. Perform the Hart Command "Clock monitor test". The
transmitter must go to up-scale setting the secondary
output stage. To recover from the alarm status a power-off,
power-on operation is required.
4. Power-off the transmitter
5. Put the Write Protect Mode switch in Write Disable condition.
6. Power-on the transmitter. The transmitter must go first to
up-scale setting the secondary output stage, then finally the
output must provide the actual pressure value.
Write Protect
Mode link
5 6
Location of the links on the electronics
Upscale/Downscale
link
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