VEGA VEGASWING 83A EXD - Manual (Page 24)

24 VEGASWING 81A EXD and 83A EXD
Diagnosis
5 Diagnosis
5.1 Recurring test acc. to WHG
The implementation of the recurring test acc.
to WHG is stated in the general type ap-
proval no. Z-65.11-154 (see paragraph 8 of
the certificate).
Note these approvals when VEGASWING
81A EXD and 83A EXD are used as part of
an overfill protection acc. to WHG.
VEGASWING 81A EXD and 83A EXD with
VEGATOR 536 EX, 537 EX, 636 EX signal
conditioning instruments meet in mode A
(overfill protection) the requirements acc. to
AK 3.
Recurring test acc. to WHG
According to the type approval to WHG (no.
Z-65.11-154) the recurring test acc. to WHG
can be carried out by pushing the test key
on the VEGA TOR 536 EX, 537 EX, 636 EX
signal conditioning instrument. The sensor
must neither be removed, nor a filling of the
vessel is necessary for responding of the
sensor. This is valid for VEGASWING
81A EXD and 83A EXD with two-wire oscilla-
tor SWING E82 Z EX.
With the provided current values you can
carry out the function test also directly via a
DCS or a processing system.
The implementation and the switching se-
quence of the function test are stated under
"Test key“ and the following table in the oper -
ating instructions of the appropriate VEGA-
TOR signal conditioning instrument.
Test key
For coordinations in conjunction with two-wire
oscillator (SWING E82Z EX) a function test
can be carried out. The VEGA TOR signal
conditioning instrument has an integral test
key. The test key is lower ed in the fr ont plate
of the signal conditioning instrument. Push
the test key with a suitable object (screw-
driver, pen etc.). When pushing the key , the
system is checked on the following criteria:
- switching function of the switching outputs
- switching function of the failure outputs
- potential separation of the outputs
- signal processing of the signal conditioning
instrument.
After pushing the test key , the complete
measuring system will be checked on correct
function. During the test the following operat-
ing conditions are simulated:
- fault signal
- empty signal
- full signal.
Check if all three switching conditions occur
in the correct sequence and the stated dura-
tion. If this is not the case, there is a failure in
the measuring system (see "5.2 Failure re-
moval“ in the operating instructions of the
signal conditioning instrument). Note that the
connected instruments are activated during
the function test. Hence you can check the
correct function of the measuring system.
Due to this fault monitoring, the combination
of the following instruments corresponds to
classes 1 to 3 (AK 3) acc. to DIN 19 251.
AK 3 means that the system is fail safe.
- VEGASWING 81A EXD, 83A EXD
- oscillator SWING E82Z EX
- VEGATOR 536 EX, 537 EX and 636 EX
signal conditioning instrument