Page 1
Operating Instructions
for
Electronic Pressure Switch
Model: PDL
Page 2
PDL
1. Contents
1. Contents ........................................................................................................ 2
2. Note .............................................................................................................. 3
3. Instrument Inspection .................................................................................... 3
4. Regulation Use .............................................................................................. 3
5. Operating Principle ........................................................................................ 4
6. Mechanical Connection ................................................................................. 5
7. Electrical Connection .................................................................................... 5
8. Switching-Point Adjustment .......................................................................... 7
9. Order Codes ................................................................................................. 7
10. Dimensions ................................................................................................... 8
11. Maintenance ................................................................................................. 8
12. Technical Information .................................................................................... 9
13. Declaration of Conformance ....................................................................... 10
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: +49(0)6192-2990
Fax: +49(0)6192-23398
E-Mail: info.de@kobold.com
Internet: www.kobold.com
Page 2 PDL K03/0413
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PDL
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
The devices are only to be used, maintained and serviced by persons familiar
with these operating instructions and in accordance with local regulations
applying to Health & Safety and prevention of accidents.
When used in machines, the measuring unit should be used only when the
machines fulfil the EWG-machine guidelines.
3. Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery:
The standard delivery includes:
• Electronic Pressure Switch model: PDL
• Operating Instructions
4. Regulation Use
Any use of the Electronic Pressure Switch, model: PDL, which exceeds the
manufacturer’s specification may invalidate its warranty. Therefore, any resulting
damage is not the responsibility of the manufacturer. The user assumes all risk
for such usage.
Pressure-switches are employed for the regulation and monitoring of pressure in
containers, hydraulic and pneumatic systems and the refrigeration industry etc.
During installation, commissioning and operation of these devices,
please ensure to observe appropriate national safety regulations
(e.g. VDE 0100).
PDL K03/0413 Page 3
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PDL
5. Operating Principle
By employing a spring-loaded elastic measuring component, along with
application of Hall effect, up to 2 switching outputs are produced for a given
pressure value. The ventilation of the pressure-switch is carried out via an airpermeable diaphragm located in the upper section of the housing.
The switching output can be supplied on choice; either N.O. or N.C.
The switching output can be adjusted locally, by means of an adjustment-screw.
Pressure-switch with p-switching output
pressure switch
10...30 VDC
p-switching
semi conductor
control unit
ohmic load
inductive load
capacitive load
Pressure-switch - N.O. and N.C.
Without pressure the switch is open; if the pressure increases the switch closes
as soon as the existing pressure exceeds the switching point. This switching
function is called "Normally Open". Accordingly, if the pressure decreases the
switch will be opened as soon as the existing pressure drops below the switching
point.
Without pressure the switch is closed; if the pressure increases the switch opens
as soon as the existing pressure exceeds the switching point. This switching
function is called "Normally Close". Accordingly, if the pressure decreases the
switch will be closed as soon as the existing pressure drops below the switching
point.
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PDL
6. Mechanical Connection
The mounting position of the pressure-switch is arbitrary. The pressure tappings
should be prepared in accordance with the connection diagram shown below. For
the purpose of sealing choose appropriate gaskets according to DIN 16,258 or
profile seals. The correct torque depends on material and type of the gasket
used, as well as on the pressure connection of the pressure-switch. The starting
torque should not exceed 40 Nm. The assembly place should be free from strong
vibrations and radiant heat. The admissible environmental conditions for the
pressure-sensors are to be maintained. After making the pressure connection
and the electrical connection, the sensors are ready for use.
7. Electrical Connection
Attention! Make sure that the voltage values of your system
correspond with the voltage values of the measuring unit.
• Make sure that the supply wires are de-energised.
• A non stabilised DC-supply within the given limit is sufficient as power supply.
• Pressure switches with M12x1 connector may not be used with connecting
cables with integrated LEDs.
• Suitable couplings with different cable lengths are optional available.
Warning! Incorrect wiring will lead to damage of the unit’s
electronics.
PDL K03/0413 Page 5
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PDL
Terminal Connections:
Round plug connector M12x1 (4-PIN)
Terminal Description
Cable outlet
1
3
+
(plus terminal of power supply)
-
(minus terminal of power supply)
4 Switching output 1 black
2 Switching output 2 white
Electrical Connection
1 Switching output
UB
S1
4
1
OV
3
2
2 Switching outputs
UB
S2
brown
blue
S1
OV
4
1
3
2
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PDL
8. Switching-Point Adjustment
The adjustment of the switching point is made under pressure. The switching
point is set via the turning screw. By turning the screw clockwise the switching
point is raised. The turning screw must not be protected against self movement.
Adjustment screw for Sw. output 1
Adjustment screw for Sw. output 2
9. Order Codes
Model Description Output Connection
31=1 N/O contact
32=2 N/O contacts
33=1 N/C contact
34=2 N/C contacts
35=1 N/O + 1N/C
31=1 N/O contact
32=2 N/O contacts
33=1 N/C contact
34=2 N/C contacts
35=1 N/O + 1N/C
R2 = G
1
N2 =
R2 = G
1
N2 =
1
/
male
4
/4 NPT
1
/4 male
/4 NPT
PDL-01
PDL-11
Electronic
pressure switch
Brass housing
With plug M12x1
Electronic
Pressure switch
Aluminium housing
with plug M12x1
Switch point [bar]
increasing pressure
C315 = -0,9 to -0,05
B126 = 0,005 to 0,1
B025 = 0,05 to 1
B045 = 0,013 to 2,5
B055 = 0,2 to 4
B065 = 0,3 to 6
B075 = 0,5 to 10
A095 = 2,5 to 25
A115 = 3 to 60
A125 = 5 to 100
A135 = 8 to 160
A145 = 13 to 250
A155 = 20 to 400
A165 = 30 to 600
PDL K03/0413 Page 7
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PDL
31,8
1
10. Dimensions
PDL-0... PDL-1...
4
.
0
6
49+0.5
4K SW36
6K SW32
G1/4B
5
.
0
+
3
1
1
7
5
.
0
+
3
G1/4B
11. Maintenance
The described pressure sensors don't need any maintenance. They do not
contain any components which may be repaired or exchanged locally. Repairs
can only be performed in our factory.
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PDL
12. Technical Information
Housing: PDL-0...: Brass
PDL-1...: Aluminium, anodised
Upper part: Plastic
Connections: G 1/4 , male
Option: 1/4" NPT
other sizes, on request
Measuring element: PDL-0...: capsule, Copper-alloy
PDL-1...: Helical head, St. Steel 1.4571
Max. Temperature: -20...+80 °C Media
-20...+80 °C Ambient
-30...+80 °C Storage
Temperature comp. range: 0...+80 °C
Temperature influence: 0,4% / 10K
Over-load limit: 4-times (range ≤ 10 bar)
2-times (range ≥16 bar)
Load-change: 1 x 106
Electrical Connection: Plug M12x1 (4-pole)
Option: Cable
Switching function: N.C. or N.O., P-switching
Adjustment range: 10...100% of F.S.
Adjustment of switching point: via adjustment screw
Reproducibility: < 1% of F.S.
Switching hysteresis: ≤ 5% of F.S., ≤ 10% of F.S. at 16 and 25 bar
Power supply: 10...30 VDC
Switching capacity: max. 100 mA (max. 30 VDC)
Protection Cat.: IP 65 (IP 67 with cable output)
PDL K03/0413 Page 9
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PDL
13. Declaration of Conformance
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Electronic Pressure Switch Model: PDL
to which this declaration relates is in conformity with the standards noted below:
EN 50081-1 1992
Electromagnetic compatibility - Generic emission standard –
Residential, commercial and light industry
EN 50082-2 1995
Electromagnetic compatibility - Generic emission standard –
Industrial environment
Also, the following EEC guidelines are fulfilled:
2004/108/EC EMC Directive
Hofheim, 16. Jan. 2007
H. Peters M. Wenzel
General Manager Proxy Holder
Page 10 PDL K03/0413
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