VEGA VEGATOR 536 Ex - Manual (Page 13)

VEGATOR 536 Ex 13
Diagnosis
5 Diagnosis
5.1 Recurring test acc. to WHG
The implementation of the recurring test acc.
to WHG is regulated in the general type ap-
proval no. Z-65.11-154, (see item 8 of the
certificate).
Note the additional approvals when VEGAS-
WING 81A and 83A are used as part of an
overfill protection acc. to WHG.
VEGASWING 61Ex, 63Ex, 81AEx and 83AEx
with signal conditioning instruments
VEGATOR 536 Ex, 537 Ex, 636 Ex meet the
fail safe requirements acc. to AK 3 in mode A
(overfill protection).
Recurring test acc. to WHG
In accordance with the type approval acc. to
WHG (no. Z-65.11-154, Z-65.11-285) the
recurring test acc. to WHG can be carried
out by pressing the test key on the
VEGATOR 536 Ex, 537 Ex, 636 Ex signal
conditioning instrument. The sensor must
neither be removed, nor should a response
be triggered by filling the vessel. This ap-
plies to VEGASWING 61, 63, 81AEx and
83AEx with SW E60ZEx and SW E82ZEx the
two-wire oscillator.
The implementation and the switching se-
quence of the function test is stated under
"Test key“ and the following table in the oper-
ating instructions of the appropriate
VEGATOR signal conditioning instrument.
28
30
32
+
–
+
–
+
–
mA V
4 … 20 mA 12 … 20 V
Sensor
VEGATOR
series 500
5.2 Failure removal
Failure Measure, failure removal
The red failure- Check the sensor inputs on the following failures:
LED of the signal - shortcircuit on the input
conditioning instru-
ment lights
- sensor not correctly connected
- sensor line interrupted
- supply voltage too low
Check if the sensor is connected correctly.
- Failures on the sensor effecting a current change below 2 mA or
above 23 mA, cause a fault signal in the signal conditioning instru-
ments.
Measure the current on the connection line to the sensor.
In normal condition, the terminal voltage of the sensor is at least 12 V.
Please note that in Ex-applications, the Ex-protection is not influ-
enced by the measuring instruments.