PLS40 Level Sensor FLOWVISION.pdf

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In touch with the medium
» BEDIA Level monitoring sensors
Typ PLS 40 DC 12/24 V
Typ PLS 45 DC 5 V
Typ PLS 30 DC 12/24 V
Rev. 03 GB 12.04.2007
BEDIA Motorentechnik GmbH & Co. KG
Weissenbrunner Hauptstrasse 6
D-91227 Leinburg/Weissenbrunn
Phone +49 (0) 9187 9509 611
Fax
+49 (0) 9187 9509 1611
vertrieb@bedia.com
www.bedia.com
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BEDIA Level monitoring sensors
» Index
General description ........................................................................................4
Measurable mediums .....................................................................................5
Output ..........................................................................................................6
Installation instruction ....................................................................................7
Functionality overview level probes minimum .................................................8
Functionality overview level probes maximum ................................................9
Level probes type PLS 40 .............................................................................10
Probes with connector bayonet DIN 72585 ................................................10
Probes with cable....................................................................................12
Probes with connector bayonet 16 S. .........................................................14
Probes with thread M 27 x 1. ...................................................................15
Probes with connector bayonet 10 SL .......................................................16
Probes with connector DIN 43650 ............................................................17
Probes with connector bayonet 16 S .........................................................18
Technical data PLS 40 probes .................................................................. 20
Level probes type PLS 45 .............................................................................22
Probes type PLS 45 description .................................................................22
Technical data PLS 45 probes ...................................................................23
Special accessories for level probes type PLS 40 and type PLS 45 ..................24
Level probes type PLS 30 .............................................................................26
Probes with connector bayonet 10S L ....................................................... 26
Probes with cable and connector bayonet 10 SL ........................................ 27
Technical data PLS 30 probes .................................................................. 28
BEDIA Level monitoring sensors
3
» General description
Level monitoring sensor with approvals
These sensors monitor the level of aqueous and oily liquids. They are used in:
» engines
» ships
» utility vehicles
» sets of machines
In engines these sensors monitor the level of:
» cooling water, oil level and fuel container
These sensors are used reliably for automatic filling and refilling of liquids, such as for
supplying engine oil and fuel service tanks.
Wherever pressure switches or temperature probes are today used as level monitoring elements, this
sensor offers the advantage of its indicating a critical condition far sooner:
Temperature probes frequently react too late, because the medium to be monitored is no
longer present. The rise in temperature is not passed on to the pick-up sensor. Pressure
switches do not indicate low oil until there is a total shortage of oil and thus too late to
protect the engine. The level sensor issues a warning when there is still enough medium
present.
Probe for aqueous liquids
Probe for oily liquids
BEDIA Level Monitoring Sensors differ from float-type switches through their compact
design and their resistance to vibration:
Since they contain no mechanical moving parts, their functioning cannot be influenced
either by soil particles or other influences. No current is sent into the medium via an elec-
trode with BEDIA sensors, and so insulation of the probe and electrolysis in the system are
not possible.
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BEDIA Level monitoring sensors
» Measurable mediums
How the sensor functions
The level sensor functions on the capacitive principle. It detects the change in capacitance
that develops when an electrode surrounded by air is immersed in a liquid medium. This
change in capacitance on the electrode of the sensor excites an oscillator, causing it
to vibrate (at a frequency of approx. 600 kHz). This signal is then processed by digital
evaluation electronics.
Capacitance measurement
Electrical field
V
V
V
Air
Oil
ε
r
= 1
Air
Oil
ε
r
= 1
Er = 1 Er = 1
Er = 1
V
V
V
ε
r
> 1
ε
r
> 1
Sensor
Shield
Sensor
Shield
Sensor
Shield
Medium variants
»
For electrically conductive liquid mediums
with relative permittivity within a range of
ε
r
: 35 ... 85
(water, coolant, water/glucose mixture)
»
And for electrically non-conductive liquid mediums
with relative permittivity within a range of
ε
r
: 1.8 ... 6
(engine oil, fuels, hydraulic oil)
BEDIA Level monitoring sensors
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