Siemens SITRANS LVL200E Operating Instructions Manual page 28

Sensor
current -
Sensor
1. Fault sig- < 3.6 mA
nal
0.6 s
(±0.2 s)
+ t
1)
A
2. Empty 8 mA
signal (±1.5 mA)
1.5 s
(±0.5 s)
3. Full signal 16 mA
(±1.5 mA)
1.5 s
(±0.5 s)
28
I/mA
16
±1,5
8
±1,5
< 3,6
Fig. 29: Flow chart of the function test
1 Fault message
2 Empty signal
3 Full signal
Check if all three switching conditions occur in the correct sequence
and the stated time period. If this is not the case, there is a fault in the
measuring system (see also the operating instructions manual of the
signal conditioning instrument). Keep in mind that connected instru-
ments are activated during the function test. By doing this, you can
check the correct function of the measuring system.
Note:
Keep in mind that the starting time t
the time up to the first switching (e.g. SITRANS SCSC, SITRANS
TCSC +1 s)
Test procedure
After releasing the button or after a brief line break.
Level relay Signal lamp
A - overfill A - Overfill
protection protection
currentless
energized
currentless
Starting time of the voltage supply
1)
SITRANS LVL200E - Operating Instructions
0,6 1,5 1,5
±0,2 ±0,5
of the voltage supply can extend
A
Level relay Signal lamp
B - dry run B - Dry run
protection protection
currentless
currentless
energized
3
2
1
t/s
±0,5
Fail safe Control
relay lamp
currentless
energized
energized
MAN-100411