Endress+Hauser Liquiline M CM42, Руководство по функциональной безопасности

Страница: 51 / 72

Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0 51 of 72
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pH value is below pH 8.0, the current outputs must show a high or low error
current for at least four seconds.
The (active) safe state has been reached.
•
Reconfigure the system for your application, especially reset the current output
spreading to the values you need.
•
Done.
The proof test has to be documented with date, tester and the result (see example in
chapter 9).
This test detects approx. 90 % (proof test coverage) of all possible dangerous undetected
device failures.
6.2.2 Proof test of the Memosens cable CYK10
You need a transmitter, a Memosens cable and a Memosens sensor. All components
must be certified according to IEC 61508.
Note!
The proof test can be done in the laboratory or "in process".
The procedure of the proof test is as follows:
Navigate to the menu Setup – Functional Safety and deactivate “SIL meas
Mode” if switched on.
Enter the menu item "Cable Proof Test".
Push the jog shuttle to start the proof test. Make sure that you have
connected the cable and the sensor correctly. The system is not able to
distinguish between a disconnected sensor and a broken communication link.
Wait until the proof test has been finished (about 30 seconds).
The result is displayed. In case of an error, you can restart the test, but
beforehand you should check the connections between cable and transmitter
and cable and sensor.
The proof test has to be documented with date, tester and the result (see example in the
safety manual of the cable).
This test detects approx. 90 % (proof test coverage) of all possible dangerous undetected
device failures.
The following screenshots give an impression how it looks like on the display: