VEGA VEGAWAVE 63 - two-wire - Manual (Page 24)

This is possible up to SIL2 in a single channel architecture (1oo1D),
and up to SIL3 in a multiple channel, redundant architecture.
The following instrument combinations meet the requirements
according to SIL:
VEGAWAVE 63 Ex with
l Oscillator WE60Z
l Signal conditioning instrument VEGATOR 636Ex or SPLC (safety-
oriented PLC)
There are the following possibilities to carry out the recurring function
test:
1 Filling of the vessel up to the switching point
2 Dismounting of the sensor and immersion in the the original
product
3 Short interruption of the supply line to the sensor
4 Pushing the test key on the signal conditioning instrument
1 F illing the vessel up to the switching point
If this does not cause any problems, you can fill the vessel up to the
switching point and monitor the correct sensor reaction.
2 D ismounting of the sensor and immersion in the original
product
You can dismount the sensor for test purposes and check its proper
functioning by immersing it in the original product.
3 S hort interruption of the supply line to the sensor
The recurring function test according to IEC 61508 can be carried out
through a short interruption (> 2 seconds) of the supply line to the
sensor. This starts a test sequence.
The correctness of the subsequent switching conditions on the
indications of the SPLC must be monitored. The sensor must neither
be dismounted nor triggered by filling the vessel.
You can carry out the function test with the outputted current values
also directly via a safety PLC or a process control system.
4 P ushing the test key on the signal conditioning instrument
A test key is lowered in the front plate of the signal conditioning
instrument. Push the test key for > 2 seconds with a suitable object.
Hence a test is started. Hence the correctness of the subsequent
switching conditions must be monitored via the two LEDs on the signal
conditioning instrument as well as the connected facilities. The sensor
must neither be dismounted, nor controlled by filling the vessel.
This test is valid if you cannot change the vessel filling or cannot
dismount the sensor.
The recurring function test according to IEC 61508 can be carried out
by pushing the test key on a respective signal conditioning instrument
or briefly (> 2 seconds) interrupting the supply line to the sensor.
Implementation - Func-
tion test
Test without filling or
dismounting the sensor
(3, 4)
24 VEGAWAVE 63 • - two-wire
6 Set up
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-EN
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