Emerson Pressure Washer PS3 User Manual

Pressure Switch

D A T A S H E E T

The ALCO PS3 is a Pressure Switch with fixed switch-point
settings.

Features

• Maximum Operating Pressure up to 43 bar

• Test Pressure up to 48 bar

• Standard factory settings from stock in small volumes

• High and low pressure switches

• High temperature version with snubber for direct

compressor mounting (Range 6)

• Direct mounting reduces the number of joints and thus

avoiding potential leakage

• Precise setting and repeatability

• IP 65 protection if used with the new PS3-Nxx and PS3-

Lxx cables with plug (acc. EN 175301-803), no additional
gasket required (molded into plug)

• Customer specific versions in multipacks, minimum order

quantity 100 Stück

Options

• For direct mounting on a pressure connection (free

standing) or with a capillary tube

• Direct compressor head mounting with high temperature

bellows and snubber:

- reduces the number of joints

- avoids potential leakage

- saves high cost of flexible hose

• TÜV approved versions for high and low pressure

• Micro-switch for narrow pressure differentials

• Gold plated contacts for low voltage/current applications

• Cables with plug PS3-Nxx/PS3-Lxx not included; to be

ordered separately (see page 8 for details)

PS3

Alco Controls

PS3

Standards

per Low Voltage Directive

per PED Directive 97/23/EC, TÜV appr. versions only

Manufactured and tested to standards on our own

responsibility

Underwriter Laboratories

Introduction

PS3 are equipped with a SPDT snap action contact, switching
from 1-2 to 1-4 on rising pressure and from 1-4 to 1-2 on falling
pressure (see diagram). The PS3 is factory preset according to
customers specification and is not adjustable. Several models
are available:

• Low pressure switch, with automatic or manual reset

• High pressure switch, with automatic or manual reset

• TÜV approved safety high pressure limiter with automatic

reset

• TÜV approved safety high pressure cut-out, with internal or

external manual reset

TÜV approval for pressure switches can be reached either by
using a double diaphragm (Pressure range 1-5) which acts in a
fail-safe mode or by a single pressure element (Bellows,
Pressure range 6) which is able to resists to > 2 Mio. cycles
between 50% and 100% of the maximum operating pressure
(see 4.6.1 of EN 12263).

PS3__35003_EN_R08.doc 1 / 10 09.08.2011

single diaphragm double diaphragm

bellows (pressure range 6)

Technical data

PS3

Alco Controls

Pressure Switch

D A T A S H E E T

Pressure sensing element

Type of

diaphragm

Standard

temperature Double diaphragm Bronze no 1-5 Yes B,S,W A,K,L,S,U,X

High

temperature steel 6 no A,R S,U,X

*) see page 7 for more details.

Note: For high temperature applications, i. e. medium
temperatures between 70 °C and 150 °C, the maximum
ambient temperature must be derated as per drawing.

E.g.: on medium temperature 120 °C the ambient temperature
of 55 °C around the switch housing should not be exceeded.

Inductive load (AC15) 3A / 230VAC 0,1A / 230VAC 1.5A / 230VAC 0,1A / 230VAC
Inductive load (DC) 0,1A / 230VDC 0,1A / 230VDC 0.1A / 230VDC 0,1A / 230VDC
Motor rating amps (FLA) 6A / 120 / 240VAC _ 2.5A / 120 / 240VAC
Lock rotor amps (LRA) 36A / 120 / 240VAC _ 15A / 120 / 240VAC

Note: Standard contact not suitable for electronic applications (< 100 mA)

Protection class (IEC 529)
with terminal cover
with appliance socket or cables with

plug PS3-Nxx / -Lxx / -215 / -415
Resistance to vibration (at 10..1000 Hz) 4g -40°C to 150°C for Range 6

Medium compatibility * HFC, HCFC Available approvals TÜV, UL

*) NOTE: PS3 are not released for use with inflammable refrigerants.

Max. medium

temperature

+ 70° C

+ 150° C

Construction Material

Single diaphragm Bronze no 1-5 No A,R A,K,L,S,U,X

Bellows Stainless yes 6 Yes B,S,W S,U,X

Standard

(SPDT)

IP 00
IP 30
IP 65

Gold plated contacts

Snubber Pressure

Ranges

Maximum ambient temperature (°C)

70

60

50

40

30

70 80 90 100 110 120 130 140 150
Medium temperature (°C)

Standard (SPDT)

Temperature range TS:

ambient, storage and
transportation

medium

Weight (approx.) 0.1 kg

TÜV

approval

Micro switch

(SPDT)

Function

Code *

Micro switch(SPDT)

Gold plated Contacts

-40°C to 70°C

-40°C to 70°C

Possible

Pressure Conn.

_
_

Pressure Ranges

Pressure Range

code

1 / A -0.6 .. 6 27 30 approx. 1,3

3 /C Standard 0.1 .. 16 approx. 1,5 see charts on page

4 / D and 5 / E (SPDT) 6 .. 30 31 36 approx. 4 4 - 6

6 / F 10 .. 43 43 48 approx. 5
J / S -0.6 .. 6 27 30 approx. 0.2 to 0.3
L / U Micro switch 0.1 .. 16 approx. 0.3 to 0.45

N / W (SPDT) 6 .. 30 31 36 approx. 0.4 to 0.6

O / X 10 .. 43 43 48 approx. 0.5 to 0.8

Type of contact Adjusting

Range

(bar)

Max. Operating

Pressure PS

(bar)

Proof

Press. PT

(bar)

Differential

reset (bar)

Differential

automatic

(bar)

Tolerances (bar)

Range code
Setting

Tolerances are valid between -20...+55°C.

1 / J 3 / L 4 5 / N 6 / O 4,5,6 (TÜV appr.)

±0.16 ±0.4 ±0.8 ±0.8 ±0.8

according to EN 12 263

PS3__35003_EN_R08.doc 2 / 10 09.08.2011

PS3

P

1

P

3

4

Alco Controls

Pressure Switch

D A T A S H E E T

Selection

1. Preferred types

Type PCN Fixed setting

Reset Max.

temperature

(bar)

pressure

Cut-out Cut-in ambient connection (bar)

High Pressure Controls

PS3-A6S 0 715 603 16,0 11,0 7/16"-20 UNF
PS3-A6S 0 715 604 19,0 15,0 Auto

+ 70°C + 150°C

PS3-A6S 0 715 600 26,5 22,5 Schrader opener

Low Pressure Controls / Pressure Limiter for low pressure protection PSL EN 12263

PS3-W1S 0 714 760 -0,3 1,2 7/16"-20 UNF
PS3-W1S 0 714 761 0,3 1,8 Auto

+ 70°C + 70°C

PS3-W1S 0 714 762 2,0 3,5 Schrader opener

Pressure Limiter for high pressure protection PSH with snubber for direct compressor mounting EN 12263

PS3-W6S 0 715 831 14,0 10,0
PS3-W6S 0 715 556 21,0 16,0 7/16"-20 UNF
PS3-W6S 0 715 555 25,0 20,0 Auto

+ 70°C + 150°C

PS3-W6S 0 715 567 29,0 23,0 Schrader opener
PS3-W6S 0 715 550 33,5 27,5 and snubber
PS3-W6S 0 715 553 40,0 33,0

Leakage

test

Pressure

connection

pressure

48 female thread with

30 female thread with

48 female thread with

Pressure Cut Out for high pressure protection PZH with snubber for direct compressor mounting EN 12263

PS3-B6S 0 715 568 19,2
PS3-B6S 0 715 564 22,7 appr. external 7/16"-20 UNF
PS3-B6S 0 715 563 27,3 5 bar manual

+ 70°C + 150°C

48 female thread with
PS3-B6S 0 715 569 29,5 below reset Schrader opener
PS3-B6S 0 715 560 36,0 cut-out and snubber

Delivery: small quantities, single package without plug (Cables with plug must be ordered separately, see page 8)

2. Customer specific types

Minimum batch size: 100 pieces

Switching points

The differential of factory set switch points can be adjusted
within the limits given in the charts on page 4 to 6. Use the
recommended lower switch point line in working envelope for
optimum results.

Example:

Step 1: Select your desired upper switch point P

. Draw a

1

horizontal line to cross the upper switch point line.
Step 2: Draw a vertical line from this intersection point.
Step 3: Select your desired switch point between P

and P4.

2

Notes:

1. Specify always upper and lower switching points for
pressure switch with automatic reset function.

2. Specify only cut-out switching point for pressure switch
with manual reset function.

3. For versions with micro-switch only one switching point can
be adjusted while the second switching point is determined
by the fixed differential of the micro-switch (see Pressure
Ranges on page 2).

40

pressure
(bar)

30

P

2

20

P

10

0

01234567891011

4. Specify such devices with one switching point as the

Example

Upper switching point

max. lower. .
recommended lower ...
min. lower...

... switching point

significant point and the other one as non-significant by
putting the latter in brackets, e.g. PS3-AJS 2.0/(1.8)

PS3__35003_EN_R08.doc 3 / 10 09.08.2011