BEDIA level - monitoring - probes

Type PLS 10 DC 12 / 24 Volt

Type PLS 30 DC 12 / 24 Volt
Type PLS 40 DC 12 / 24 Volt

In touch with the medium

Rev. US11 – 23.03.2004

page 2
Index page
General description for all BEDIA sensors…………………………………………………… 5

Installation instruction…………………………………………………………………………… 6

Technical data type PLS 40…………………………………………………………............... 7

Functionality overview Level probes minimum………………………………………………. 8

Functionality overview Level probes maximum……………………………………………… 9

Suggestion for level monitoring in the oil sump.……………………………………............. 10-11

Level probe type PLS 40 with connector bayonet DIN 72585…………………. 12-13

with cable connector………….................................................................................…........

14-15

with connector bayonet 16 S………………….……… 16

with connector thread M 27 x 1…………...................18

with connector Cannon bayonet 10 SL…..................19

with connector DIN 43650………………….………… 21

Level probe type PLS 30 with connector Cannon bayonet 10 SL……………... 22

technical data………….………………………………. 23

Level probe type PLS 10 according to the conductivity principle 24

with connector bayonet 16 S…………...……………
technical data…….……………………………………. 25

Control and Power Supply Unit for all BEDIA sensors…………………………………. 26-27

page 3
page 4
General information
Level monitoring sensor
These sensors monitor the level of aqueous and oily liquids. They are used in engines, utility
vehicles, ships, sets of machines, etc. to monitor aqueous and oily liquids. In engines this provides
monitoring of the level of cooling water, of the oil level and of the fuel container. In shipping, they
are not only used to monitor engines but also to monitor supply tanks, wastewater tanks and bilges.
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.

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 electrode with BEDIA sensors, and so insulation of the probe and electrolysis in the system
are not possible.

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.

Circuitry output
The level sensors have a short-circuit-proof circuitry output.
• Minus switching: The output transistor switches minus potential to the load
• Plus switching: The output transistor switches plus potential to the load

With switching currents over 1 A, a relay has to be inserted. To do so, a free-wheeling diode has
to be connected parallel to the relay as an overvoltage protective device with inductive loading
(see technical specs).

Medium variants
The level sensors are designed for two different kinds of mediums:
• For electrically conductive liquid mediums with relative permittivity within a range of:
εr 35-85 (water, coolant, water/glucose mixture)
• And for electrically non-conductive liquid mediums with relative permittivity within a range
of: εr 1.8-6 (engine oil, fuels, hydraulic oil)

Automatic operational check

The sensors have an approx. two-second operational check built in as standard. When the power
supply is applied (such as ignition being switched on), this signal appears for approx. two seconds,
thus signalling readiness to function. If this signal does not appear, the sensor should be checked.
This self-monitoring makes it possible to check the level monitoring sensors from a central point for
their readiness to function as well as for cable breakage. Especially in intricate, rambling systems,
such as ships, checking conventional level switches is very difficult. Further function control times
are also available upon request.

Delayed indication
To avoid indication errors when the surface of the liquid is fluctuating producing brief shortages and
excesses in the level, the output signal comes as standard with the indication delayed by approx.
seven seconds. Further indication delay times are available upon request.

page 5
 Installation Instruction for BEDIA Level Monitoring Probes

BEDIA Level Monitoring Probes may be installed in any attitude.

Please observe the following instructions when installing the probe:

1. The level sensors have to be installed in a calmed zone so that the medium does not
constantly moisten the level sensor by sloshing and splashing, which would cause error
messages.
This point is usually applicable for installation in gearboxes or for direct installation in engine oil
pans during operation. In such cases, the correct level is only possible during standstills.

2. When carrying out the installation, be sure that the distance from the sensor probe to the wall is
at least 15 mm.

sensor

wall

>15mm

Only for water - sensors :

3. If the sensor is installed from above in a plastic container, error messages might come about
under certain circumstances if the medium does not conduct any potential. When installed in
all other positions, the casing will come into contact with the medium. This guarantees that
potential will be present.

4. Connection Diagram
Minus switching probes Plus switching probes

5. Connection of the cables free wheeling diode

Bayonet 16S Bayonet 10SL Bayonet DIN 72585 Cable

Thread M27x1 Bayonet DIN 43650
+ A 1 Brown
- B 2 White
S C 3 Green

page 6
Technical data for type PLS 40 at TU = 25 °C

Operating voltage: 12V-24V (-25%/+50%)

Current consumption: Typ. 8 mA
Signal output switching current 1 A over the whole operating voltage range. At inductive
loads freewheeling diode e.g. 1N4007, has to be mounted
at the load.
Switch point vertically mounted: 20mm ± 6mm
Switch point horizontally mounted: 2,5mm ± 1mm
Switch point hysteresis: typ. < 3mm
Medium temperature: - 30°C to + 125°C
- 30°C to + 125°C
Ambient temperature: - 30°C to + 125°C
Storage temperature: - 50°C to + 125°C
Response delay: see product table on following pages
Integral control function: see product table on following pages
Reverse polarity protection: in-built between plus and minus terminal
Function: see product table on following pages

CAUTION

- Minus switching probes: Do not connect minus potential to the signal terminal or plus
potential to the minus terminal, as otherwise the probes may be destroyed.

- Plus switching probes: Do not connect plus potential to the signal terminal or minus potential
to the plus terminal, as otherwise the probes may be destroyed.

Voltage drop: < 200mV / 1A

Vibration: IEC 68-2-6 5 - 57 Hz ± 1,5mm
58 - 200 Hz 20g
Cab Frame
5Hz 0.007g²Hz 20Hz 0.001g²Hz
20Hz 0.07g²Hz 119Hz 0.08g²Hz
100Hz 0.007g²Hz 223Hz 0.011g²Hz
300Hz 0.007g²Hz 391Hz 0.091g²Hz
2000Hz 0.0035g²Hz 797Hz 0.10g²Hz
1212Hz 0.001g²Hz
1780Hz 0.0005g²Hz
1980Hz 0.0004g²Hz

Pressure resistance: 25 bar = 367,5 PSI

Environmental protection: see product table on following pages
Mounting attitude: optional
Housing: typ. CuZn38Pb1,5
material number 2.0371
capacitive connected to ground
Probe coating: Tefzel® ETFE
Weight: approx. 120g
Mounting thread: see product table on following pages
Marking: laser

EMC
Electrostatic discharge: IEC 1000-4-2 8kV air discharge
6kV contact discharge
Radiated electro-magnetic fields: IEC 1000-4-3 30 V/m; 27 MHz to 1000 MHz
80% AM (1kHz)
Burst: IEC 1000-4-4 2 V power supply
1 kV signal output
Surge: IEC 1000-4-5 0.5 kV power supply
1 kV, signal output
Conducted high frequency: IEC 1000-4-6 10 V; 10 kHz to 80 MHz
80% AM (1kHz)

CE - marking to EC-directive 89/336/EWG (EMC-directive)

E1 – marking applied

page 7
Functionality overview
Level probes minimum

MINIMUM probes

If a minimum probe is removed from the medium, its outlet becomes active after the report
delay. If it is a working current probe, its outlet becomes low-impedance after the report
delay and a signal is available at the outlet. If it is a quiescent current probe, its outlet
becomes high-impedance after the report delay and there is no longer a signal available at
the outlet.

If a minimum probe is immersed in the medium, its outlet immediately becomes passive. If
it is a working current probe, its outlet becomes high-impedance after immersion and a
signal is no longer available at the outlet. If it is a quiescent current probe, its outlet
becomes low-impedance after immersion and there is a signal available at the outlet.

page 8
Functionality overview
Level probes maximum

MAXIMUM probes:

If a maximum probe is immersed in the medium, its outlet becomes active after the
report delay. If it is a working current probe, its outlet becomes low-impedance after the
report delay and a signal is available at the outlet. If it is a quiescent current probe, its
outlet becomes high-impedance after the report delay and there is no longer a signal
available at the outlet.

If a maximum probe is removed from the medium, its outlet immediately becomes passive.
If it is a working current probe, its outlet becomes high-impedance after the removal and
there is no longer a signal available at the outlet. If it is a quiescent current probe, its outlet
becomes low-impedance after removal and a signal is available at the outlet.

page 9
Suggestion for level monitoring in the oil sump

Which are the benefits of a level monitoring system in the oil sump over conventional pressure and
temperature sensors?
Temperature sensors indicate very slowly. When motor oil is lost, e. g. by tubing breakage, the
component temperature can no longer be conducted to the sensors.
The lower limit value of oil pressure switches or sensors is set low (low oil pressure, with the motor
running at no load). At rated motor speed and with too little oil in the oil circuit an oil-air mixture
may be produced without that a signal is put out. The components are no longer sufficiently cooled
and lubricated.
In the two events described above, the output signal is available either too late or even not at all so
that the motor will be damaged. The level monitoring system, however, indicates even before the
oil level becomes too low, i.e. as soon as the oil level has fallen 10 to 20 mm below the minimum
marking on the dipstick. Oil pressure and oil temperature indication is always ensured.
Functional

diagram

Picture Nr. Description Ref. Nr.

1 Tubing complete with 350 mm pipe coupling 421 660
Tubing complete with 450 mm pipe coupling 421 661
Tubing complete with 550 mm pipe coupling 421 659
2 Sensor support 454 134
3 PA pipe, available in meters 421 662
4 Level monitoring sensor Oil MIN 9 - 36 V 420 431
Level monitoring sensor Oil MAX 9 - 36 V 420 454
5 Straight connector without cable 420 703
90° connector without cable 420 702
Straight connector with cable 420 707
90° connector with cable 420 706

page 10
Installation instructions

1. Drain the motor oil.

2. Fasten adjustable corner swivelling screw-fitting to the engine with hose line and sensor
bracket. The sensor holder has to be adjustable by the slots to determine the minimum point.
point.

3. Install the ventilation to the crankcase (such as inspection hole cover)

4. Install and connect the sensor.

5. Check for correct electrical function. The minimum sensor must indicate now.

6. Refill the oil up to the minimum marking on the dip stick.

7. Move the sensor and support slowly down until the signal is no longer available. The switch
point of the sensor is now exactly at the minimum oil level of the motor

8. Move the sensor down by another 10 to 20 mm and fix it. The signal „oil level too low“ will now
be put out when the level is approx. 10 to 20 mm below the minimum marking on the dipstick.

page 11
Probe type PLS 40 with connector DIN 72 585
Environmental protection 69K according to DIN 40050
Probe suitable for aqueous media Probe suitable for oil or fuel

Probe type PLS 40 with connector according to Signal output Signal output
DIN 72 585 minus potential plus potential

thread Monitoring Integral Monitoring Aqueous Oil and fuel Aqueous Oil and fuel
display control delay liquids liquids
function Ref. No. Ref. No. Ref. No. Ref. No.
Level sensors output OC, operating current
M 14 x 1,5 MIN 2 sec. 7 sec. 420 400 420 431 420 401 420 432
M 14 x 1,5 MIN 0 sec. 7 sec. ---- 420 446 ---- 420 443
M 14 x 1,5 MIN 0 sec. 2 sec. 420 419 420 447 ---- ----
M 14 x 1,5 MIN 2 sec. 60 min. ---- 420 444 ---- ----
M 14 x 1,5 MIN 2 sec. 60 sec. ---- 420 449 ---- ----
M 14 x 1,5 MIN 2 sec. 7 sec. 420 450 ---- ---- ----
M 14 x 1,5 MIN 1 sec. 17 sec. 420 451 ---- ---- ----
M 14 x 1,5 MIN 0 sec. 0 sec. 420 452 ---- ---- ----
M 14 x 1,5 MAX 0 sec. 0 sec. ---- 420 454 420 413 420 414
M 14 x 1,5 MAX 0 sec. 7 sec. ---- ---- 422535 ----
M 18 x 1,5 MIN 2 sec. 7 sec. 420 404 420 435 420 405 420 436
M 18 x 1,5 MIN 0 sec. 7 sec. 420 417 ---- ---- ----
M 18 x 1,5 MAX 0 sec. 0 sec. 420 422 420 430 ---- ----
1/4“ NPTF MIN 2 sec. 7 sec. 420 408 420 439 420 409 420 440
1/4“ NPTF MIN 0 sec. 7 sec. 420 418 ---- ---- ----
1/4“ NPTF MIN 1 sec. 17 sec. 420 415 ---- ---- ----
¼“NPTF MIN 0 sec. 0 sec. 420 429 420 463
1/4“ NPTF MAX 2 sec. 7 sec. ---- 420 456 ---- ----
R 3/8“ MAX 0 sec. 7 sec. 420 420 420 421 ---- ----
G 3/8“ MAX 0 sec. 0 sec. 420 416 ---- ---- ----
G 3/8“ MAX 0 sec. 0 sec. ---- ---- ---- 420 448
Probe with the sensing point 43mm from sensor tip
M 14 x 1,5 MIN 1 sec. 17 sec. 420 412 ---- ---- ----
Level sensors output RC, quiescent current
M 14 x 1,5 MIN 0 sec. 7 sec. 420 402 420 433 420 403 420 434
M 14 x 1,5 MIN 0 sec. 7 sec. ---- ---- 420 425 420 428
M 18 x 1,5 MIN 0 sec. 7 sec. 420 406 420 437 420 407 420 438
1/4“NPTF MIN 0 sec. 7 sec. 420 410 420 441 420 411 420 442
R 1/2“ MIN 0 sec. 7 sec. 420 426 ---- ---- ----

Technical data see page 7, Installation instruction see page 6

page 12
Accessories for probes with connector DIN 72585

Order Nr. Description Connection

420 700 Straight connector for bayonet DIN 72 585, for corrugated tubing NW10
420 701 90° connector for bayonet DIN 72 585, for corrugated tubing NW 10
420 702 Connector 90° for cable
420 703 Straight connector for cable
420 699 Cable with connector 420 703 150 mm 2*
420 704 Cable with connector 422 702 300 mm 2*
420 705 Cable with connector 420 703 300 mm 2*
420 706 Cable with connector 420 702 1000 mm 1*
420 707 Cable with connector 420 703 1000 mm 1*
420 708 Cable with connector 420 702 3000 mm 1*
420 709 Cable with connector 420 703 2000 mm 1*
420 714 Cable with connector 420 703 5000 mm 1*
420 715 Cable with connector 420 703 10000 mm 1*
420 716 Cable with connector 420 702 6000 mm 1*
420 717 Cable with connector 420 703 3000 mm 1*
420 718 Cable with connector 420 703 5000 mm 1*
420 719 Cable with connector 420 703 6000 mm 1*
421 639 Screw -in adapter outside: R1" inside: M18x 1,5
421 640 Screw -in adapter outside: M22x 1,5 inside :M14x 1,5
421 694 Screw -in adapter outside :R1/2“ inside: M14x 1,5
421 695 Screw -in adapter outside: G1/2” inside: M14x 1,5
421 884 Screw -in adapter outside: M22x 1,5 inside: 1/4”NPTF
421 641 Braze-in adapter 1/4”NPTF
421 644 Braze-in adapter M14x 1,5
421 648 Braze-in adapter M18x 1,5
421 696 Braze-in adapter M16x 1,5
(1*) Cable end without connector
(2*) Cable with 3 pole flat quick-connect terminations 6.3 in the housing

page 13
Probes type PLS 40 with cable connector
Environmental protection IP67 according to DIN 40050

Probe suitable for aqueous Probe suitable for

media oil or fuel

Cable:automotive cable FLR 3x0,75 black

temp. range : - 40°C to +150°C

Cable colour brown = + Cable colour brown = +

white = - white = -
green = S green = S

Probes type PLS 40 with cable connector Signal output Signal output
minus potential plus potential
Thread Monitoring Integral Monitoring Cable Cable Aqueous Oil and fuel Aqueous Oil and
display control delay length connection liquids liquids fuel
function in mm type Ref. No. Ref. No. Ref. No. Ref. No.
Level sensors output OC, operating
current
M 12 x 1 MIN 0 sec. 7 sec. 1000 1* 421 580 ---- ---- ----
M 14 x 1,5 MIN 2 sec. 7 sec. 250 1* 418 152 421 991 425 016 425 017
M 14 x 1,5 MIN 2 sec. 7 sec. 250 8* 421 927 421 928 ---- ----
M 14 x 1,5 MIN 2 sec. 7 sec. 2000 1* ---- 421 929 ---- ----
M 14 x 1,5 MIN 2 sec. 7 sec. 250 5* ---- 421 072 ---- ----
M 14 x 1,5 MIN 2 sec. 7 sec. 250 9* 421 070 ---- ---- ----
M 14 x 1,5 MIN 2 sec. 7 sec. 250 3* ---- 422 525 ---- ----
M 14 x 1,5 MIN 0 sec. 7 sec. 2500 1* 422 297 422 298 ---- ----
M 14 x 1,5 MAX 0 sec. 7 sec. 250 5* ---- 421 568 ---- ----
M 14 x 1,5 MIN 2 sec. 7 sec. 250 10* 418 154 ---- ---- ----
M 14 x 1,5 MIN 0 sec. 7 sec. 500 3* 422 506 422 507 ---- ----
M 14 x 1,5 MIN 0 sec. 2 sec. 500 1* ---- 421 507 ---- ----
M 14 x 1,5 MAX 0 sec. 0 sec. 1000 1* ---- ---- 425 300 425 301
M 14 x 1,5 MIN 2 sec. 3 sec. 250 1* ---- 422 527 ---- ----
M 18 x 1,5 MIN 2 sec. 7 sec. 1000 1* ---- 421 591 ---- ----
M 18 x 1,5 MIN 2 sec. 7 sec. 400 3* 422 515 ---- ---- ----
M 18 x 1,5 MAX 2 sec. 7 sec. 400 3* 422 516 ---- ---- ----
M 18 x 1,5 MIN 2 sec. 7 sec. 250 2* 422 503 422 504 425 020 425 021
M 18 x 1,5 MAX 0 sec. 0 sec. 1000 1* 425 305 425 304 ---- ----
1/4“ NPTF MIN 0 sec. 0 sec. 250 1* 421 566 421 567 ---- ----
1/4“ NPTF MIN 2 sec. 7 sec. 250 1* 418 153 421 992 425 024 425 025
1/4“ NPTF MIN 2 sec. 7 sec. 250 1* 421 402 ---- ---- ----
1/4“ NPTF MIN 2 sec. 7 sec. 500 3* 422 225 422 226 ---- ----
1/4“ NPTF MIN 2 sec. 7 sec. 500 11* 422 524 ---- ---- ----
1/4“ NPTF MIN 2 sec. 7 sec. 10000 1* 420 424 ---- ----
1/4“ NPTF MIN 0 sec. 7 sec. 500 3* ---- ---- ---- 425 303
R 3/8“ MAX 0 sec. 0 sec. 360 3* ---- 421 510 ---- ----
R 3/8“ MAX 0 sec. 7 sec. 2000 1* 422 523 ---- ---- ----
G 1/2" MIN 0 sec. 0 sec. 250 9* 421 515 ---- ---- ----
G 1" MIN 2 sec. 7 sec. 250 1* 425 307 ---- ---- ----

Technical data see page 7, Installation instruction see page 6.

page 14
 Probes type PLS 40 with cable connector Signal output Signal output
minus potential plus potential
Thread Monitoring Integral Monitoring Cable Cable Aqueous Oil and fuel Aqueous Oil and fuel
display control delay length connection liquids liquids
function in mm type Ref. No. Ref. No. Ref. No. Ref. No.
Level sensors output RC, quiescent
current
M 14 x 1,5 MIN 0 sec. 7 sec. 250 1* 421 582 421 993 425 018 425 019
M 14 x 1,5 MIN 0 sec. 3 sec. 220 5* 421 569 ---- ---- ----
M 18 x 1,5 MIN 0 sec. 7 sec. 250 1* ---- ---- 425 022 425 023
1/4“ NPTF MIN 0 sec. 0 sec. 2000 1* ---- ---- 425 030 ----
1/4“ NPTF MIN 0 sec. 7 sec. 250 1* 421 999 421 997 425 026 425 027
1/4“ NPTF MIN 0 sec. 7 sec. 250 4* 422 505 ---- ---- ----
1/4“ NPTF MIN 0 sec. 7 sec. 500 3* 422 521 422 522 425 302 ----
3/8“ NPTF MIN 0 sec. 7 sec. 250 1* ---- ---- ---- 425 031
3/8“ NPTF MIN 0 sec. 0 sec. 180 15* ---- 400 001 ---- ----
G 3/8“ MIN 0 sec. 0 sec. 2000 1* 422 534 422 533 ---- ----
R 3/8“ MIN 0 sec. 7 sec. 250 1* 421 998 ---- ---- ----
R 3/8“ MIN 0 sec. 7 sec. 250 3* 422 286 ---- ---- ----
1/2“ NPT MIN 0 sec. 0 sec. 300 14* ---- ---- ---- 422 531
1/2“ NPT MIN 2 sec. 4 sec. 300 14* ---- ---- 422 532 ----
Probe with the sensing point at 35 mm from sensor tip
R 3/8“ MIN 0 sec. 7 sec. 2000 1* 422 523 ---- ---- ----
G 1“ MIN 0 sec. 7 sec. 250 1* 425 306 ---- ---- ----
(1*) Cable end without connector
(2*) Cable with 3 pole flat quick-connect terminations 6.3 in the housing
(3*) Cable with 3 pole DEUTSCH socket
(4*) Cable with 3 pole round G & H connector
(5*) Cable with 3 pole Reinshagen connector
(8*) Cable with 3 pole round AMP connector
(9*) Cable with 3 flat quick-connect terminations 6.3 in single housing
(10*) Cable with 3 pole AMP connector 423 325 and strain relief
(11*) Probe 422 524 like the probe 422 225 however with a monitoring of cable defect
(14*) Cable with Sure-Seal-connector
(15*) Cable with Packard connector

Accessories for probes with connector DIN 72585

Order Nr. Description Connection
421 639 Screw -in adapter outside: R1" inside: M18x 1,5
421 640 Screw -in adapter outside: M22x 1,5 inside :M14x 1,5
421 694 Screw -in adapter outside :R1/2“ inside: M14x 1,5
421 695 Screw -in adapter outside: G1/2” inside: M14x 1,5
421 884 Screw -in adapter outside: M22x 1,5 inside: ¼”NPTF
421 641 Braze-in adapter ¼”NPTF
421 644 Braze-in adapter M14x 1,5
421 648 Braze-in adapter M18x 1,5
421 696 Braze-in adapter M16x 1,5

Technical data see page 7, Installation instruction see page 6

page 15
Probe type PLS 40 with Bayonet connector 16 S
Environmental protection IP67 according to DIN 40050

Probe suitable for aqueous media Probe suitable for oil or fuel

Probe type PLS 40 with Bayonet connector 16 S Signal output Signal output
minus potential plus potential
Thread Monitoring Integral Response Aqueous Oil and fuel Aqueous Oil and fuel
display control delay liquids liquids.
function Ref. No. Ref. No. Ref. No. Ref. No..
Level sensors output OC, operating current
M 12 x 1 MIN 2 sec. 7 sec. 421 404 421 593 ---- ----
M 14 x 1,5 MIN 2 sec. 7 sec. 421 575 421 595 425 002 425 003
M 14 x 1,5 MIN 1 sec. 17 sec. ---- 420 445 ---- ----
M 14 x 1,5 MIN 2 sec. 2 sec. ---- 422 508 ---- ----
M 14 x 1,5 MAX 0 sec. 0 sec. ---- 422 511 ---- ----
M 14 x 1,5 MIN 0 sec. 0 sec. 422 528 ---- ---- ----
M 14 x 1,5 MAX 2 sec. 2 sec. ---- 422 509 ---- ----
M 14 x 1,5 MIN 2 sec. 15 sec. 421 637 ---- ---- ----
M 14 x 1,5 MIN 1 sec. 2 sec. 422 502 ---- ---- ----
M 14 x 1,5 MIN 0 sec. 7 sec. 421 564 421 590 ---- ----
M 14 x 1,5 MIN 2 sec. 0 sec. ---- 421 562 ---- 422 510
M 18 x 1,5 MIN 2 sec. 7 sec. 421 570 421 572 425 006 425 007
M 18 x 1,5 MIN 0 sec. 7 sec. ---- 422 031 ---- ----
1/4“NPTF MIN 2 sec. 7 sec. 421 577 421 597 425 010 425 011
1/4“NPTF MIN 1 sec. 17 sec. 421 401 ---- ---- ----
1/4“NPTF MIN 0 sec. 7 sec. 421 581 ---- 425 000 ----
1/4“NPTF MIN 0 sec. 20 sec. 421 636 ---- ---- ----
1/4“NPTF MIN 6 sec. 15 sec. 422 500 ---- ---- ----
1/4“NPTF MIN 0 sec. 0 sec. ---- 422 529 ---- ----
3/8“ NPTF MIN 2 sec. 7 sec. 420 992 420 994 425 014 425 015
3/8“ NPTF MIN 0 sec. 7 sec. ---- ---- ---- 425 001
3/8“NPTF MAX 0 sec. 7 sec. ---- ---- ---- 425 029
Probe with the sensing point at 25 mm from sensor tip
M 22 x 1,5 MIN 1 sec. 17 sec. 422 501 ---- ---- ----
Probe with housing nickel plated
M 14 x 1,5 MIN 2 sec. 7 sec. 421 513 ---- ---- ----
Level sensors output RC, quiescent current
M 12 x 1,5 MIN 2 sec 7 sec 421400 ---- ---- ----
M 14 x 1,5 MIN 0 sec. 7 sec. 421 579 421 599 425 004 425 005
M 18 x 1,5 MIN 0 sec. 7 sec. 421 571 421 573 425 008 425 009
1/4“NPTF MIN 0 sec. 7 sec. 420 993 424 999 425 013 425 012

Technical data see page 7, Installation instruction see page 6

page 16
Accessories for probes with bayonet 16 S

Order Nr. Description Connection

421 672 Straight connector for bayonet 16 S, for corrugated tubing NW10
421 673 90° connector for bayonet 16 S, for corrugated tubing NW 10
421 772 Straight connector for bayonet 16 S with 5,6 mm cable sealing
421 773 90° connector for bayonet 16 S with 5,6 cable sealing
421 670 Cable with connector straight 421 772 300 mm 2*
421 871 Cable with connector straight 421 772 500 mm 13*
421 891 Cable with connector straight 421 772 800 mm 2*
421 018 Cable with connector straight 421 772 1015 mm 2*
421 586 Cable with connector straight 421 772 1300 mm 2*
421 668 Cable with connector straight 421 772 3000 mm 2*
421 775 Cable with connector straight 421 772 5000 mm 2*
421 774 Cable with connector straight 421 772 15000 mm 2*
421 671 Cable with connector 90° 421 773 300 mm 2*
421 017 Cable with connector 90° 421 773 300 mm 12*
421 585 Cable with connector 90° 421 773 1300 mm 2*
421 669 Cable with connector 90° 421 773 5000 mm 1*
421 587 Cable with connector 90° 421 773 10000 mm 12*
421 639 Screw -in adapter outside: R1" inside: M18x 1,5
421 640 Screw -in adapter outside: M22x 1,5 inside :M14x 1,5
421 694 Screw -in adapter outside :R1/2“x 1,5 inside: 1/4"NPTF
421 695 Screw -in adapter outside: G1/2" inside: M14x 1,5
421 884 Screw -in adapter outside: M22x 1,5 inside: 1/4"NPTF
421 641 Braze-in adapter 1/4"NPTF
421 644 Braze-in adapter M14x 1,5
421 648 Braze-in adapter M18x 1,5
(1*) Cable end without connector
(2*) Cable end with 3 pole flat quick-connect terminations 6.3x0.8 in the housing
(12*) Cable end without housing with flat quick-connect terminations 6.3x0.8
(13*) Cable end with Deutsch connector DT 04-3P

Technical data see page 7, Installation instruction see page 6

page 17
Probe type PLS 40 with threaded connector M 27 x 1
Environmental protection IP67 according to DIN 40050

Probe suitable for aqueous media Probe suitable for oil or fuel

Probe type PLS 40 with threaded connector M 27 x 1 Signal output

minus potential
Thread Monitoring Integral Response Type Aqueous liquids Oil and
display control delay fuel
function Ref. No. Ref. No.
Level sensors output OC, operating current
M 14 x 1,5 MIN 2 sec. 7 sec. 421 603 421 623
M 14 x 1,5 MIN 2 sec. 7 sec. 1* ---- 422 293
M 14 x 1,5 MIN 0 sec. 7 sec. ---- 421 634
M 14 x 1,5 MIN 2 sec. 20 sec. 421 617 ----
1/4“ NPTF MIN 2 sec. 7 sec. 421 607 421 627
Level sensors output RC, quiescent current
M 14 x 1,5 MIN 0 sec. 7 sec. 2* ---- 422 299
M 14 x 1,5 MIN 0 sec. 7 sec. 421 611 421 631
(1*) Housing nickel plated
(2*) Probe with the sensing point at 15 mm from sensor tip, housing nickel plated

Accessories for probes with M 27 x 1 thread

Order Nr. Description Connection
421 642 Straight connector M 27x1 for corrugated tubing NW 10
421 643 90° connector M 27x1 for corrugated tubing NW 10
421 742 Straight connector M 27x1 with 5,6 mm cable sealing
421 743 90° connector M 27x1 with 5,6 mm cable sealing
421 988 Cable with connector straight 421 742 300 mm 2*
421 038 Cable with connector 90° 421 743 300 mm 2*
421 588 Cable with connector straight 421 742 10000 mm 1*
421 639 Screw -in adapter outside: R1" inside: M18x 1,5
421 640 Screw -in adapter outside: M22x 1,5 inside :M14x 1,5
421 694 Screw -in adapter outside :R1/2“ inside: M14x 1,5
421 695 Screw -in adapter outside: G1/2” inside: M14x 1,5
421 884 Screw -in adapter outside: M22x 1,5 inside: 1/4”NPTF
421 641 Braze-in adapter 1/4”NPTF
421 644 Braze-in adapter M14x 1,5
421 648 Braze-in adapter M18x 1,5
421 696 Braze-in adapter M16x 1,5
(1*) Cable end without connector
(2*) Cable end with 3 pole flat quick-connect terminations 6.3x0.8 in the housing

Technical data see page 7. Installation instruction see page 6.

page 18
Probe type PLS 40 with Cannon connector for bayonet 10 SL to VG0095342
Environmental protection IP67 according to DIN 40050

Probe suitable for aqueous media Probe suitable for oil or fuel

Probe with Cannon connector for bayonet 10 SL Signal output Signal output
according to VG0095342 minus potential plus potential
Thread Monitoring Integral Response Aqueous Oil and fuel Aqueous Oil and fuel
display control delay liquids liquids.
function Ref. No. Ref. No.. Ref. No. Ref. No..
Level sensors output OC, operating current
M 14 x 1,5 MIN 2 sec. 7 sec. 421 403 421 504 421 505 421 506
M 18 x 1,5 MIN 2 sec. 7 sec. 422 512 422 513 421 500 421 501
M 18 x 1,5 MIN 0 sec. 0 sec. ---- ---- ---- 421 514
M 18 x 1,5 MAX 2 sec. 7 sec. ---- 422 514 ---- ----
M 18 x 1,5 MAX 0 sec. 0 sec. --- ---- ---- 421 509
1/4“ NPTF MIN 2 sec. 7 sec. 421 907 421 908 421 498 421 499
1/2“ UNF MIN 2 sec. 7 sec. ---- 421 584 ---- ----
Level sensors output RC, quiescent current
M 14 x 1,5 MIN 0 sec. 0 sec. ---- ---- 421 508 ----
M 14 x 1,5 MIN 0 sec. 7 sec. ---- ---- ---- 421 516
M 18 x 1,5 MIN 0 sec. 7 sec. 421 989 421 990 421 502 421 503
1/4“ NPTF MIN 0 sec. 7 sec. ---- 421 909 ---- ----

Accessories for probes with Cannon connector for bayonet 10 SL

Order Nr. Description
421 652 Straight connector for bayonet 10 SL according to VG 0095342
421 885 90° connector for bayonet 10 SL according to VG 0095342
420 760 Straight connector for bayonet 10 SL
420 761 90° connector for bayonet 10 SL
421 653 Cable with connector 421 652 2000 mm
421 657 Cable with connector 421 652 5000 mm
421 658 Cable with connector 421 885 2000 mm
421 697 Cable with connector 421 885 5000 mm
421 639 Screw -in adapter outside: R1" inside: M18x 1,5
421 640 Screw -in adapter outside: M22x 1,5 inside: M14x 1,5
421 694 Screw -in adapter outside :R1/2“ inside: M14x 1,5
421 695 Screw -in adapter outside: G1/2” inside: M14x 1,5
421 884 Screw -in adapter outside: M22x 1,5 inside: 1/4”NPTF
421 641 Braze-in adapter 1/4”NPTF
421 644 Braze-in adapter M14x 1,5
421 648 Braze-in adapter M18x 1,5
421 696 Braze-in adapter M16x 1,5

Technical data see page 7, Installation instruction see page 6.

page 19
page 20
Probe type PLS 40 with connector DIN 43 650
Environmental protection IP65 according to DIN 40050
Probe suitable for aqueous media Probe suitable for oil or fuel

Probe type PLS 40 with connector according to Signal output Signal output
DIN 43 650 minus potential plus potential
Thread Monitoring Integral Monitoring Aqueous Oil and fuel Aqueous Oil and fuel
display control delay liquids liquids
function Ref. No. Ref. No. Ref. No. Ref. No.
Level sensors output OC, operating current
M 14 x 1,5 MIN 2 sec. 7 sec. 420 600 420 620 420 601 420 621
M 18 x 1,5 MIN 2 sec. 7 sec. 420 604 420 624 420 605 420 625
1/4“NPTF MIN 2 sec. 7 sec. 420 608 420 628 420 609 420 629
R 3/8“ MAX 0 sec. 0 sec. ---- 420 632 ---- 420 650
Level sensors output RC, quiescent current
M 14 x 1,5 MAX 0 sec. 7 sec. 420 602 420 622 420 603 420 623
M 18 x 1,5 MAX 0 sec. 7 sec. 420 606 420 626 420 607 420 627
1/4“NPTF MAX 0 sec. 7 sec. 420 610 420 630 420 611 420 631

Accessories for probes with connector

Order Nr. Description
421 880 Connector M3x35 according to DIN 43 650
421 639 Screw -in adapter outside: R1” inside: M18x 1,5
421 640 Screw -in adapter outside: M22x 1,5 Inside: M14x 1,5
421 694 Screw -in adapter outside :R1/2“ inside: M14x 1,5
421 695 Screw -in adapter outside: G1/2” inside: M14x 1,5
421 884 Screw -in adapter outside: M22x 1,5 inside: 1/4”NPTF
421 641 Braze-in adapter 1/4”NPTF
421 644 Braze-in adapter M14x 1,5
421 648 Braze-in adapter M18x 1,5
421 696 Braze-in adapter M16x 1,5

Technical data see page 7, Installation instruction see page 6.

page 21
Probe type PLS 30 with bayonet 10 SL to VG 0095342
Environmental protection IP67 according to DIN 40050

Probe suitable for aqueous media Wiring diagram

Probe type PLS 30 with bayonet 10 SL according to Signal output Signal output
VG 0095342 minus potential plus potential

Thread Monitoring Integral Monitoring Aqueous Oil and fuel Aqueous Oil and fuel
display control delay liquids Ref. No liquids Ref. No
function Ref. No . Ref. No .
Level sensors output OC, operating current
M 18 x 1,5 MIN 1 sec. 3 sec. 421 903 421 950 421 470 421 471
M 18 x 1,5 MAX 1 sec. 3 sec. 421 951 421 952 421 472 421 473
M 18 x 1,5 MIN 2 sec. 7 sec. ---- 421 984 ---- ----

Accessories for probes with connector Cannon for bayonet 10 SL

Order Nr. Description

421 652 Straight connector for bayonet 10 SL
421 885 90° connector for bayonet 10 SL
421 653 Cable end with connector 421 652 2000 mm
421 657 Cable end with connector 421 652 5000 mm
421 648 Braze-in adapter, internal thread M 18 x 1,5

Probe type PLS 30 with bayonet 10 SL according to VG 0095342

Probe suitable for aqueous media

Probe with bayonet 10 SL according to VG 0095342 Signal output Signal output

minus potential plus potential
Thread Monitoring Function- Integral Monitoring Aqueous Oil and fuel Aqueous Oil and fuel
display control control delay liquids Ref. No liquids Ref. No
function Ref. No . Ref. No .
Level sensors output OC, operating current
M 18 x 1,5 MIN 1 sec. 3 sec. 200 421 906 421 957 421 478 421 479
M 18 x 1,5 MAX 1 sec. 3 sec. 200 421 958 421 959 421 480 421 481
M 18 x 1,5 MIN 1 sec. 3 sec. 450 421 960 ---- ---- ----

Technical data see following page.

page 22
Technical data for type PLS 30 at TU = 25 °C

Mechanical data
Housing: stainless, non-magnetic
Thread: M18x1,5, max. tightening torque 30 Nm
Sealing ring (not supplied with the system): 18x22 DIN 7603-CU
Fitting: Cu-Zn alloy material No. 2.0401
Connection: see table according to VG 0095342
Isolation of sensor: Tefzel ETFE®
Marking: function, type number, manufacturing date, voltage
Mounting attitude: optional
Switch point: immersion depth, horizontal: approx. 3 mm ± 2 mm
immersion depth, vertical: approx. 20 mm ± 6 mm
Weight: approx. 200 g
Ambient temperature: - 30°C to + 125°C
Storage temperature: - 55°C to + 125°C
Medium temperature: - 30°C to + 125°C
Sinusoidal vibration (peak): 2 - 25 Hz 1,6 mm amplitude
25 - 420 Hz 4 g amplitude
420 - 1330 Hz 5 g amplitude
1330 - 2700 Hz 10 g amplitude
2700 - 5000 Hz 25 g amplitude
Relative humidity: up to 100 %

Environment
Shock (peak): 50 g half-sine 11 ms
EMC: IEC 801 (1-4) < 500 mV rms, depending on cables
EMC to VG 95373: depending on cables
Interference suppression: according to VDE0871, limit B
Pressure on sensor: max. 25 bar/367,5 PSI
Media to be monitored: water, cooling water, seawater, oil, fuel, hydraulic oil, brake fluid
Dependability: The performance is not impaired by small deposits on the probe

Electric data
Voltage rating: 9 - 36 V
Output: open collector, switching minus potential
Closed-circuit current at 24 V: < 10 mA
Power consumption: closed-circuit current plus switching current
Switching capacity: max. 1 A continuous current in the voltage range indicated
Load: resistive and inductive
Load inductance: 500 mH
Protection against reverse polarity: between UB and frame
Voltage spikes: 70 V dropping to UN in 270
Hysteresis of response: max. ± 5 mm around the sensing point
Response time – “level acceptable”: typically 1 s (0,5 s to 1,5 s)
Response time - ”level unacceptable”: typically 3 s (1 s to 4 s)
Recovery time: <2s
Integral control function: see table
Terminal connection: A = + UB B = - UB
C = output signal
Potential of housing: galvanically isolated from plus UB and minus UB VDE
Dielectric strength: according to VDE 0100.500, VDC 1min
Insulation resistance: according to VDE 0160.500, VAC/50 Hz, 1 min
Dielectric resistance: > 10 M Ohm
Through connection voltage: < 0, 5 V

CAUTION

- Minus switching probes: Do not connect minus potential to the signal terminal or plus
potential to the minus terminal, as otherwise the probes may be destroyed.
- Plus switching probes: Do not connect plus potential to the signal terminal or minus potential
to the plus terminal, as otherwise the probes may be destroyed.
- Inductive loads: A free-wheeling diode, e.g. 1N4007, has to be mounted at the load.

page 23
Conductivity probe type PLS 10
Environmental protection IP67 according to DIN 40050
Probe suitable for aqueous media

Conductivity probe with bayonet 16 S

Conductivity probe type PLS 10 Signal output
Minus potential
Thread Monitoring display Integral control function Monitoring delay Aqueous liquids
Ref. No.
M 14 x 1,5 MIN 2 sec. 7 sec. 422 200
M 14 x 1,5 MAX 2 sec. 7 sec. 422 201
1/4“ NPTF MIN 2 sec. 7 sec. 422 204
1/4“ NPTF MAX 2 sec. 7 sec. 422 205
1/4” NPTF MIN 2 sec. 7 sec. 422 196

Accessories for probes with bayonet 16 S

Order Nr. Description Connection

421 672 Straight connector for bayonet 16 S, for corrugated tubing NW10
421 673 90° connector for bayonet 16 S, for corrugated tubing NW 10
421 772 Straight connector for bayonet 16 S with 5,6 mm cable sealing
421 773 90° connector for bayonet 16 S with 5,6 cable sealing
421 670 Cable with connector straight 421 772 300 mm 2*
421 871 Cable with connector straight 421 772 500 mm 13*
421 891 Cable with connector straight 421 772 800 mm 2*
421 018 Cable with connector straight 421 772 1015 mm 2*
421 586 Cable with connector straight 421 772 1300 mm 2*
421 668 Cable with c onnector straight 421 772 3000 mm 2*
421 775 Cable with connector straight 421 772 5000 mm 2*
421 774 Cable with connector straight 421 772 15000 mm 2*
421 671 Cable with connector 90° 421 773 300 mm 2*
421 017 Cable with connector 90° 421 773 300 mm 12*
421 585 Cable with connector 90° 421 773 1300 mm 2*
421 669 Cable with connector 90° 421 773 5000 mm 1*
421 587 Cable with connector 90° 421 773 10000 mm 12*
421 639 Screw -in adapter outside: R1" inside: M18x 1,5
421 640 Screw -in adapter outside: M22x 1,5 Inside :M14x 1,5
421 694 Screw -in adapter outside :R1/2“x 1,5 inside: 1/4"NPTF
421 695 Screw -in adapter outside: G1/2" inside: M14x 1,5
421 884 Screw -in adapter outside: M22x 1,5 inside: 1/4"NPTF
421 641 Braze-in adapter 1/4"NPTF
421 644 Braze-in adapter M14x 1,5
421 648 Braze-in adapter M18x 1,5
(1*) Cable end without connector
(2*) Cable end w ith 3 pole flat quick-connect terminations 6.3x0.8 in the housing
(12*) Cable end without housing with flat quick-connect terminations 6.3x0.8
(13*) Cable end with Deutsch connector DT 04-3P

page 24
Technical Data for probe type PLS 10 at TU = 25 °C
Voltage rating DC 16 - 32 V

Power consumption typically 7 mA

Switching capacity 3 W (resistive load)

Output minus switching

Voltage drop approx. 3,5 V with 3 W lamp load

Load dump protection 70 V, 270 ns

Protection from fault conditions to VDE 0939

Lamp test in-built (approx. 3 s)

Fault indicating delay approx. 7 s

Free-wheeling diode Inductive loads: A free-wheeling diode, e.g. 1N4007,

has to be mounted at the load.

Protection against reverse polarity in-built between plus and minus terminal.
Observe correct connection of plus and signal
terminals!

Operating temperature - 40°C to + 120°C

Storage temperature - 40°C to + 120°C

Admissible pressure on sensor 2 bar

Max. tightening torque on thread 30 Nm

Mounting attitude optional

Housing brass MS CuZnPb3,

nickel-plated, capacitive connected to ground

Sensor coating Tefzel ETFE

Sensor brass MS CuZn39Pb3 galvanically nickel-plated

(immersed in the medium)

Weight approx. 100 g

page 25
Control and Power Supply Unit 110/220 V AC / 12/24 V DC

Housing: plastic with control lamps MIN + MAX 110 x 75 x 65

_________________________________________________________________________

Technical Data for Control Unit

Operating voltage: 110/230 V AC or 12/24 V DC

Relay: relay contact 3A max.
Protective system: IP 54 according to DIN 40050
Mounting position: optional
Temperature: - 30 °C to + 75 °C

Up to three probes can be operated from this power supply unit. A relay, 3 A max., with one
normally open and one normally closed contact is fitted, which can be used for additional control
tasks.
A power supply unit is available for connection to 230 V.

The voltage for the relay contacts must not be taken from the power supply unit.

page 26
Control Unit for filling or emptying

Housing: plastic with control lamp 110 x 75 x 65

Technical Data for Control Unit

Operating voltage: 110/230 V AC or 12/24 V DC

Output relay: relay contact 3 A max.
Protective system: IP 54 according to DIN 40050
Mounting position: as disired
Temperature: - 30 °C to + 75 °C

Control Unit with power supply Part.-No. 421 651

for automatic filling and emptying of liquids. This unit is designed to control two „minimum“ probes.
Probe 2 monitors the maximum liquid level, probe 1 the minimum level. An output relay with a
change-over contact is switched automatically for external control tasks.
Relays 1 and 2 are switched to conduct when the liquids falls below minimum level. When the
liquid level reaches maximum, relay circuits 1 and 2 are automatically interrupted.

LED-display
• no display: liquid level above maximum
• LED „maximum“ lights green: liquid. Level is between maximum and minimum and is falling.
• Both LED’s light: liquid level is below minimum, or is between minimum and maximum and is
rising. Contacts r1 and r2 are closed.

Two „minimum“ minus switching probes with built-in control function are used for this control.
The self-control is only visible when both probes are immersed in liquid. The signal appears for
about 2 seconds when the power supply is switched on.
For this period the output (contact r1 and r2) is conducting. The voltage for the relay contacts must
not be taken from the power supply unit.

page 27