www.hydropa.de®

English copy version 2010/REV05_BLAU
1112-0001-45/22 (1/8)
1117-0001-45/22 (1/8)

HYDRAULISCHE ERZEUGNISSE GMBH & CIE. KG

PISTON PRESSURE SWITCH
DS-117 / DS-112

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INTRODUCTIONCONTENTSC PageWe are known throughout Europe as a leading
specialist for piston pressure switches and provide
our customers with a broad range of pressure
switch designs.

Introduction

2Function

2

Technical Data

3

Many years of experience with material
combinations, processing techniques andproduction tolerances enable us to meet the mostvaried requirements in a targeted and flexible
manner.

Ordering information

4

Terminal assignment

4

Reset differential pressure

5
6-7

Dimensions

Our pressure switches are distinguished by their
durable precision, a broad spectrum ofapplications and uncompromising reliability.
The DS 117/112 is the “baby” among pressure
switches. Precision and reliability are its mostimportant characteristics. It takes on the simple
tasks in the control and realises these loyally andconscientiously.

ADDITIONAL INFORMATIONFUNCTION

Further information on the correct handling of ourpressure switch rangeis available under“Operating manual for pressure switches series
DS-11*/3*/4*/5*” on our website:www.hydropa.de

The pressure switch functions on the basis of thepiston-spring principle. The microswitch (2) isactuated if the pressure lies below the configured
value. The piston (6) acts against the spring plate(5) when pressure builds up. This braces itself
against the continuously-adjustable compression
spring (4). The piston (6) transfers the force of onto
the spring plate (5) when the configured pressure
is reached on the nozzle (7), enabling themicroswitch (2) and triggering an electrical signal.
The pressure to be monitored is determined by thepreload tension of the spring (4). Adjustment isachieved by turning the adjusting element (3).
Anticlockwise rotation reduces the switchingpressure, while turning in a clockwise direction
increases the switching pressure. The adjustingelement (3) is fixed with the securing screw. A
mechanical stop prevents the compression spring(4) from seizing due to excessive turning.
2

Contains according to SVHC:• 6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol
CAS-no.: 119-47-1 EC-no.: 204-327-1• Lead (Pb)
CAS-no.: 7439-92-1 EC-no.: 231-100-4

1726543TECHNICAL DATA
General information
DesignConnection
AdjustingSetting protection
Installation
WeightHydraulicPiston diameter
Switching pressure ranges
P max (standard seal)
1)
P max (SS-Seal )Repetitive accuracy
Ambient temperature
Pressure fluid
Viscosity range
Load change

piston spring-loaded, mechanical stop prevents compression spring seizing due to excessive turninginternal G 1/4 thread or flange surface
adjusting screw cover or adjusting knurl
fixing coverarbitrarybasic type 0,27 kgø 4 mmø 5 mm

10-150 bar
5-70 bar
20-350 bar
20-240 bar
400 bar
200 bar
500 bar
500 bar
400 bar
400 bardeviation less than 1% (depending on operating range)- 40 °C to + 90 °Coil, oil-water-emulsion
10 to 800 mm²/s≥5x1006

Electrical
Switch element
Voltage typeProtection class DIN 60529
Electrical connection
Cable cross-section
Cable diameter
Seal
Switching power
Voltagemax. ohmic loadmax. inductive load
Other details
Housing
Pressure connection
Switch movement
Connection plates

electromechanical changeover switch CEE 24; VDE 0630, T85 UL 1054/CSA C22.2 No. 55 6 TSD, T90
pure silver profile contact, gold on silver palladium coated profile contact on request

alternating voltage / direct voltage
IP 65cable socket conforming to EN 175301-803, model type A, Pg9 (Pg11 on request)
0,5 mm² to 1,5 mm²
6 mm to 8 mm for Pg9 / 8 mm to 10 mm for Pg11
outer jacket seal
250 V/AC
5A
1A

24 V/DC
5A
4A

unpainted aluminium
aluminium
approx. 0,5 mm - consequently very little wear on seal and tappet guidefor NS 6 and NS 10 valve linking (only for pressure switches suitable for flange connection)1)

special low-friction seal

SERVICE LIFE
The service life of a piston pressure switch depends on numerous factors. Minimum and maximum pressures, cycle
rate, load change, hydraulic vibration, the load (amp.) on the electrical switch, etc. Where a pressure switch needs tomeet special requirements, we are in a position to address the most varied requirements in a flexible and targetedmanner, thanks to our years of experience with material pairings, machining processes and production tolerances.
Notice: The pressure switches must be installed so that the device is not exposed to damaging vibrations during
operation and eventually cause a failure. The use of suitable damping materials can significantly extend the service
life.

3

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ORDER INFORMATION

DS-1** -////

Pressure ranges

pmax.
standardpmax.
special SS seal

070 = 5 - 70 bar
150 = 10 - 150 bar
240 = 20 - 240 bar
350 = 20 - 350 bar

200 bar
400 bar
500 bar
500 bar----400 bar
400 bar(several additional details separated by slash)

Basic type DS-117 or DS-112

Fixed switching points preset by manufacturer:
standard = pressure rising (falling on request)
B
F
B/P90

= pipe installation= flange connection= integrated 90°-subplate (p max. 350 bar)

V31)
AUX1)
MSS1)
SS

= adjusting knurl with scale= gold on silver palladium= brass housing= Viton®fluoroelastomers= special low-friction seal

not named = cable socket conforming to EN 175301-803, model type A, Pg9 (Pg11 on request)
L-MP 24 = 4-pole 24 V lamp socket
M12= M12x1 (4-pole socket, axial or 90°-version on request)
1)

special versions not in stock!

TERMINALASSIGNMENT

Viton® is a registered trademark of DuPont Performance Elastomers.

DS-117 (standard)
Terminal assignmenturized)(unpress

Terminal assignmentDS-112(unpressurized)

Terminals 1-2: contact opens if pressure rises
Terminals 1-3: contact closes if pressure rises

Terminals 1-3: contact opens if pressure rises
Terminals 1-2: contact closes if pressure rises

4stand, ax

ardial90°
L-M

P2

4Connector conforming to EN 175301-803

M12x1 connector, 4-pole (only 24 V DC)(M12x1 cable socket, 4-pole)(see ordering information for cable sockets)
Special solutions possible on request! The protective earth (PE) should be connected in compliance with regulations for the electrical connection. !

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HYDRAULISCHE ERZEUGNISSE GMBH & CIE. KG

RESET DIFFERENTIAL PRESSURE
1. Standard seal (normal version):
The hysteresis achieved during continuous operation is approx. 7-12 % of the final value at a set pressure ofapprox. 60-70 % of the max. adjustable switching pressure.
Example: In the case of a DS-117-150 pressure switch with a pressure range of 10-150 bar, a hysteresis ofapprox. 8-15 bar is achieved at a set pressure of 100 bar.

2. Special low-friction seal (“SS“ design)
The hysteresis achieved during continuous operation is approx. 3-6 % of the final value at a set pressure ofapprox. 60-70 % of the max. adjustable switching pressure.
Example: DS-117/SS-240 set pressure: 200 bar --> hysteresis: ca. 12 bar
These values depend of course on the temperature and viscosity or the operating medium.
The pressure ranges with different piston diameters also influence these values.

FUNCTION DIAGRAM70barHysteresis

10 barH
normally open
LH
normally closedL5

www.hydropa.deDIMENSIONS

15

Type DS-117-***/B or DS-112-***/B1)

max. 1730

G 1/467.../V3

Adjustment elementand securing screw
hexagon socket 6 mm

8630

1520

ø 5,31)The scale is only provided for orientation. The exact configuration of the switching pressure should be realised with a pressure gauge.

15

Type DS-117/F/*** or DS-112/F/***

1)

77.../V340

ø 5,5max. 176140
ø 44

76

0,01/100mm
Rz1 max 4O-Ring ø 7x1,5Required surface qualityof unit support surface1)

6The scale is only provided for orientation. The exact configuration of the switching pressure should be realised with a pressure gauge.

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HYDRAULISCHE ERZEUGNISSE GMBH & CIE. KG

DIMENSIONSType DS-117-***/B/P90 or DS-112-***/B/P901)

30

67.../V3

15

The .../B/P90 version
is only available up to p max. 350 bar.

O-Ring ø 7x1,591max. 17

530

1520

ø 5,31)The scale is only provided for orientation. The exact configuration of the switching pressure should be realised with a pressure gauge.

ø20ca. 45

Cable sockets
version90°

ca. 70ca. 35version
L-MP***38

ca. 54ca. 50ø2034

versionstandard
27

versionaxial297

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HYDRAULISCHE ERZEUGNISSE GMBH & CIE. KG

HYDROPA HYDRAULISCHE ERZEUGNISSE GMBH & CIE. KG
Därmannsbusch 4 • D-58456 Witten / Postfach (P.O. Box) 3165 • D-58422 Witten
Telefon (Phone): +49 2302 7012-0 • Telefax: +49 2302 7012-47
E-Mail: info@hydropa.de • Internet: www.hydropa.de