91 100/112 ED
1/4
PRESSURE SWITCH
°C
kg
Ambient temperature range
–20 / +80
PS*4 PS*6 PS*8
PS*2
— PS* are piston type, hydro-electrical pressure switches.
The internal electrical contact is switched when the
operating pressure reaches the set value.
— The line pressure acts on piston (1) which is directly loaded
by a spring (2) on the opposite side. The spring load is
adjustable by means of the knob (3). When the line
pressure reaches the set valve, the piston (1) moves and
switches the micro-contact (4).
— The pressure switches are available in four pressure
ranges, from 35 up to 630 bar, and they can be subplate
mounting or 1/4” BSP threaded port type.
— Standard supply is with adjustment knob and with pressure
scale.
SYMBOLS
OPERATING PRINCIPLE
TECHNICAL CHARACTERISTICS
Pressure adjustment range
bar
bar
see par. 5
HYDRAULIC
SYMBOL
CONNECTION
SCHEME
see par. 3
< ± 1 % of set pressure
3 ÷ 35
350
6 ÷ 140
350
10 ÷ 350
650
20 ÷ 630
650
Max operating pressure
Hysteresis
Repeatability
Electrical characteristics
according to ISO 4406:1999 class 20/18/15
10 ÷ 400
25
0,67
°C
cSt
cSt
Fluid temperature range
–20 / +50
Fluid viscosity range
Recommended viscosity
Fluid contamination degree
Mass
91 100/112 ED
PS
*
PISTON TYPE
PRESSURE SWITCH
SERIES 21
p max
650 bar
max adjustable p 35 - 140 - 350 - 630 bar
91 100/112 ED
2/4
PS*
SERIES 21
Seals: N = standard NBR seals for mineral oils (standard)
V = FPM seals for special fluids
1 - IDENTIFICATION CODE
Electrical connection: for DIN 43650 connector
(included in the supply)
Adjustment knob
Pressure adjustment range:
2 = 3 ÷ 35 bar 6 = 10 ÷ 350 bar
4 = 6 ÷ 140 bar 8 = 20 ÷ 630 bar
Piston type pressure switch
Mounting type:
P = subplate mounting
T = threaded port 1/4” BSP
Series N. (the overall and mounting dimensions remain
unchanged from 20 to 29)
P S / /21 - K1 K
2 - HYDRAULIC FLUIDS
3 - ELECTRICAL CHARACTERISTICS
Use mineral oil-based hydraulic fluids HL or HM type, according to ISO 6743-4. For these fluids, use NBR seals (code N).
For fluids HFDR type (phosphate esters) use FPM seals (code V).
For the use of other fluid types such as HFA, HFB, HFC, please consult our technical department.
Using fluids at temperatures higher than 80 °C causes a faster degradation of the fluid and of the seals characteristics.
The fluid must be preserved in its physical and chemical characteristics.
AC DC
Power supply V 125 250 30 250
Max load on contacts
- resistive A 7 5 5 0,2
- inductive 4 2 3 0,02
Electrical insulation
> 1 M Ω at 500 Vdc
(according to CEI EN 60204)
Max switching rate switches/min 120
Protection class
IP 65
(according to CEI EN 60529)
4 - INSTALLATION
The pressure switches can be installed in any position without
impairing its correct operation. Ensure that there is no air in the
hydraulic circuit.
The subplate mounting pressure switch PSP type is fixed by means
of screws on a flat surface with planarity and roughness values
equal to or better than those indicated in the relative symbols. If the
minimum values are not observed, the fluid can easily leak between
the valve and the mounting surface.
Surface finishing
91 100/112 ED
3/4
PS*
SERIES 21
5 - HYSTERESIS CHARACTERISTICS
(values measured with viscosity of 36 cSt at 50°C)
PS*2 PS*4
PS*6 PS*8
6 - SUBPLATES FOR STACK MOUNTING
The PSP pressure switches can be stack mounted by means of ISO 4401-03 (CETOP 03 subplates), code 1950611 and 1950621.
The subplate code 1950611 permits the connection between the pressure switch and A and/or B ports, depending on where the bolt (1) is
installed. The subplate code 1950621 permits the connection between the pressure switch and the P port.
M4
46
31
M5
21
31
41.5
4
T
21
B
P
A
7.5
85
dimensions in mm
1
Hexagonal head M4x12 bolt
with “bonded seal” type 400-002
(Dowty)
Unscrew the bolt and its seal
from the side where the switch is
installed
2
Mounting surface with sealing rings
4 OR type 2037 (9.25x1.78) - 90 Shore
0.75
30.2
40.5
21.5
5.1
12.7
31.75
BA
T
P
M5
15.5
25.9
31
Ø 7.5 (max)
MOUNTING INTERFACE
ISO 4401-03-02-0-05
(CETOP 4.2-4-03-350)
MAX PRESSURE 350 BAR
SUBPLATE CODE 1950611 (A and B ports connection)
SUBPLATE CODE 1950621 (P port connection)
ø3.5
M5
2
21
46
31
31
41.5
B
T
A
P
74
7.5
DIFFERENTIAL PRESSURE
SETTING PRESSURE
91 100/112 ED
4/4
DUPLOMATIC OLEODINAMICA S.p.A.
20015 PARABIAGO (MI) Via M. Re Depaolini 24
Tel. +39 0331.895.111
Fax +39 0331.895.339
www.duplomatic.com e-mail: sales.exp@duplomatic.com
PS*
SERIES 21
REPRODUCTION IS FORBIDDEN. THE COMPANY RESERVES THE RIGHT TO APPLY ANY MODIFICATIONS.
7 - OVERALL AND MOUNTING DIMENSIONS
PSP
PST
dimensions in mm
MOUNTING INTERFACE (PSP version)
fastening bolts (PSP version)
N. 4 bolts M5x45 - ISO 4762 12.9 resistance class (included in the
supply)
Tightening torque: 8 Nm
4 holes M5x10
1
Mounting surface with sealing rings:
N. 1 OR type 2025 (6.07x1.78) - 90 shore
(PSP version)
2
Adjustment knob
Clockwise rotation to increase pressure
3
Graduated scale with indication of setting
pressure in [bar]
4
DIN 43650 electrical connector 3 poles + ground
supplied with pressure switch
5
Interface plate for pipe connection:
- 1/4” BSP threaded female connection
- 2 clearance holes for possible fixing by means
of bolts M5x50
NOTE: the interface plate is already installed
on the PST type pressure switch only.
