VEGA VEGASWING 83A - Manual (Page 27)

VEGASWING 81A and 83A 27
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 or Z-65.11-163, see
paragraph 8 of the certificate.
Note these approvals when VEGASWING
81A and 83A are used as part of an overfill
protection acc. to WHG.
VEGASWING 81A EX and 83A EX with VE-
GATOR 536 EX, 537 EX, 636 EX signal condi-
tioning instruments meet the requirements
acc. to AK 3 in mode A (overfill protection).
Recurring test acc. to WHG
According to the type approval to acc. WHG
(no. Z-65.11-154) the recurring test can be
carried out by pushing the test key on the
VEGATOR 536 EX, 537 EX, 636 EX signal
conditioning instrument. The sensor must not
be removed, nor made to respond by filling
the vessel. This is valid for VEGASWING
81A EX and 83A EX with two-wire SWING
E82 Z EX oscillator.
With the current values provided you can
carry out the function test also directly via a
PLC 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 setting-up meassuring instruments in
conjunction with the two-wire oscillator
(SWING E82Z EX) a function test can be
carried out. The VEGA TOR signal condi-
tioning instrument has an integral test
keylowered into the front plate. Push the test
key with a suitable object (scr ewdriver, pen
etc.). When pushing the key , the system is
checked according to 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 for cor -
rect function. During the test the following
operating conditions are simulated:
- fault signal
- empty signal
- full signal.
Check that all three switching conditions
occur in the correct sequence and for the
stated duration. If this is not the case, there is
a failure in the measuring system (see "5.2
Failure removal“ in the operating instructions
of the signal conditioning instrument). Note
that the connected instruments are activated
during the function test. Thus you can check
the correct function of the measuring system.
Thanks to this fault monitoring, the combina-
tion 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 EX, 83A EX
- SWING E82Z EX oscillator
- VEGATOR 536 EX, 537 EX and 636 EX
signal conditioning instrument