22
6 Setup
VEGAVIB 61 • Two-wire 8/16 mA
29268-EN-170315
Mode on the signal
conditioning in-
strument
Level
Signal current -
Sensor
Signal lamp - sen-
sor
Signal lamp - sig-
nal conditioning
instrument
Mode B
Dry run protection
approx. 8 mA
Green
Fault message
(mode A/B)
any
< 2.3 mA
flashes red
6.4 Proof test (SIL)
The VEGAVIB 61 is qualified for use in measuring chains of level SIL2
according to IEC 61508 (redundant, level SIL3).
The measuring system can be used for level detection of bulk solids
and meets the special requirements of safety technology.
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 ac-
cording to SIL:
VEGAVIB 61 Ex with
•
Oscillator VB60Z
•
Signal conditioning instrument VEGATOR 636 Ex or SPLC (safety-
oriented PLC)
The following options are available for carrying out the proof test:
1. Filling of the vessel up to the switching point
2. Dismounting of the sensor and immersion in the original medium
3. Short interruption of the supply line to the sensor
4. Pushing the test key on the signal conditioning instrument
1 Filling 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 Dismounting of the sensor and immersion in the original
medium
You can dismount the sensor for test purposes and check its proper
functioning by immersing it in the original product.
3 Short interruption of the supply line to the sensor
The recurring proof 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.
General information
SIL
Implementation - Func-
tion test
