Omega Engineering PSW32 User Manual

User’s Guide

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PSW32 SERIES

ELECTRONIC PRESSURE SWITCH FOR HYDRAULIC APPLICATIONS

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The information contained in this document is believed to be correct, but OMEGAEngineering, Inc. accepts no liability for any errors it contains, and
reserves the right to alter specifications without notice.
W ARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

MATERIALS OF CONSTRUCTION

Housing Die-Cast Zinc
Sensor 304 Stainless Steel
O-Ring Viton

SPECIFICATIONS

Ports 1/4" NPT
Adjustment Range 0 to 2320 PSI (0 to 160 bar)
Proof/Burst Pressure See Part Number Identification Table
Temperature Rating

Ambient 14° to 140° F (-10° to 60° C)
Media 14° to 175° F (-10° to 80° C)

Temperature Sensitivity

@ Zero Point Set Point Shifts 0.4% FS/10°C
@ Set Point Pressure Set Point Shifts 0.3% FS/10°C

Electronics Pressure Sensor, Microprocessor

Evaluation Circuitry and Solid-state
Output Driver

Switching/Reset Point Adjustable between 0 – 100% of

FS Value

Linearity < 0.5% of FS ± 1 digit
Electrical Connector Without Analog Output: DIN 43650

Table A with Removable Cable
Plug Adapter

With Analog Output: DIN 43651,

7 Pin Circular Connector

FEATURES

Real-time LED Status Display of Pressure
Adjustable Hysteresis
Off-line Calibration
Fast, Accurate Response
Extensive Service Life
Analog Output (Optional)

APPLICATION

IIdeal for Control of Air, Water, Gases,
Neutral Mineral Oils and Various Heating Oils

PSW32 Series

ELECTRONIC PRESSURE SWITCH FOR HYDRAULIC APPLICATIONS

Connector to DIN 43651 (7 Pin)
(for versions with analog output)

2.44 (62)

1.18 (30)

2.56 (65)

4.25 (108) 1.85 (47)

1.22 (31)

Connector to DIN 43650

(3) Mounting Screws

M5x45

O-Ring

1.42 (36)

1.22 (31)

1.57 (40)

1.18 (30)

1.97 (50)

All dimensions in inches (mm)

PART NUMBER PRESSURE RANGE ELECTRICAL PROOF/BURST ANALOG OUTPUT

PSI CONNECTION PRESSURE – PSI 0-10 VOLT AND 4-20mA

PSW32B 0 – 580 (0 – 40) DIN 43650 1450/2175 (100/150) No
PSW32B-A 0 – 580 (0 – 40) DIN 43651 1450/2175 (100/150) Yes
PSW32C 0 – 1450 (0 – 100) DIN 43650 2900/4350 (200/300) No
PSW32C-A 0 – 1450 (0 – 100) DIN 43651 2900/4350 (200/300) Yes
PSW32D 0 – 2320 (0 – 160) DIN 43650 4350/5800 (300/400) No
PSW32D-A 0 – 2320 (0 – 160) DIN 43651 4350/5800 (300/400) Yes

Numbers in parentheses indicate measurement in bar.
Notes: Mounting plates included.

For hydraulic applications with pressure spikes or surges install a pressure snubber.
All pressure switches are shipped with mounting screws, o-ring and mating electrical connector.

DIN 43650 without analog output DIN 43651 with analog output

1 +24V

3U

out Imax = 1A

20V
4 4 – 20mA

5 0 – 10V
PE

U

I

U

I

Micro-

Controller

SP RP

p

=

E2PROM
(SP,RP)

Load

1 +24V

3U

out Imax = 1A

2

0V
PE

I

Micro-

Controller

SP RP

p

=

E2PROM
(SP,RP)

Load

1.73 (44)

1.57 (40)

1.57 (40)

.47

(12)

.59 (15)

A

A

Ø.12 (3)

.94

(24)

1

/4 – 18 NPT

.22 (5.5)

.22 (5.5)

View on 'A'

M5

.35

(9)

.45 (11.5)

.79 (20)

Mounting Plates (Included)

1/4" NPT Pressure Port
304 Stainless Steel

All dimensions in inches (mm)

PAR T NUMBER IDENTIFICATION

ELECTRICAL PARAMETERS

Electrical connection DIN 43650 Table A without analog output

DIN 43651 (7 pin), with analog output

Power supply (polarity safe) 18 to 32V DC
Permissible residual ripple 10% (within 18 to 32V)
Current consumption <50 mA (plus load current)

SWITCHING OUTPUT

Switching mode Open collector PNP switched to supply

(suited for inductive load)

Output voltage Supply voltage minus 1.5V (approx)
Analog output O to l0V and 4 to 20mA
Contact rating I

max

= 1A (shor t-cir cuit proof)

Switching time < 5ms
Service life 100 million switching cycles
Switching logic Signal “on” with rising pressure, if SP* > RP**

Signal “on” with falling pressure, if SP < RP

* SP = Switching point **RP = Reset point

ELECTRONIC PRESSURE SWITCH FOR HYDRAULIC APPLICATIONS

a) Adjusting the switching point.

Case 1 or Case 2

Press and hold the SP button. The display
will show the previous switching pressure
setting, and the dotted bar will flash while
the button is pressed down (case 1).

You can now use the cursor keys to adjust
the switching point upwards or downwards.
If a cursor key is held down, the values will
change faster. When the cursor key is
released again, the switch-on pressure
setting will cease to change. This setting is
stored and activated when the SP button is
released, after which the display will show
the current pressure value and the bar will
quit flashing.

b) Adjusting the reset point.

Case 3 or Case 4

Press and hold the RP button. The display
will show the previous reset pressure
setting, and the dotted bar will flash while
the button is pressed down.

You can now use the cursor keys to adjust
the reset point in the same manner as
described above.

During both adjustment operations, it may
occur that the hysteresis graph changes
from one state to another at the time a
transition is made through the point
"Switching pressure = Reset pressure".
When both points are correctly set, the
hysteresis graph will also be correct. You
can change between SP and RP as often as
you wish until the settings are correct.

c) Setting a buffering time.

In order to prevent brief pressure “spikes”
or “surges” from causing undesired
switching, a buffering time can be entered.
The effect of this is that pressure changes
are evaluated only if the pressure signal in
question is present for longer than the
buffering time. In order to set a buffering
time, press the button SP before the power

supply is switched on. Release this button
again after the power supply has been
switched on. The display will then show the
buffering time in milliseconds (e.g. 03) or
seconds. The cursor buttons ▼, ▲ can be
used to set the buffering time to 03, 06,
12, 24 or 50 ms or 0.1, 0.2 or 0.4
seconds. When this has been done, press
SP to store the setting.

d) Setting the pressure switch to ambient
pressure = 0.

Since ambient pressure varies according to
altitude, the user may re-calibrate the zero
point to match local conditions.

Press the button RP before the power
supply is switched on. Release this button
again after the power supply has been
switched on and the display test has run.
The display will then show "OFS". The
cursor buttons ▼, ▲ can be used to set the
pressure display to 0. When this has been
done, press SP to store the setting.

e) Hysteresis mode

If it is desired to operate with a fixed
hysteresis value instead of the reset point,
this value can be selected as desired.

In order to set a hysteresis value, the two
buttons SP and ▼ must be pressed
simultaneously before the power supply
is switched on.

Release these buttons again after the
power supply has been switched on and the
display test has run. The display will then
show the operating mode. The cursor
buttons ▲,▼ can now be used to change
the operating mode until "HYS" appears in
the display. When this has been done,
press SP to store the setting.

The SP button can be used to display the
switching-point setting, which can be
modified by means of the cursor buttons
▲,▼.

The button RP can be used to display the
hysteresis setting, which can also be
modified by means of the cursor buttons
▲,▼.

Negative hysteresis means: Signal “on”
with rising pressure (case 1).

Positive hysteresis means: Signal “on” with
falling pressure (case 2).

If the switching point is modified, this will
automatically also result in a change in the
reset point by a value equal to the
hysteresis setting.

Case 1

Case 2

f) Window mode

If it is desired to monitor whether the pressure
lies within a certain range, a switching window
can be created for this purpose. The pressure
switch will then indicate cases in which the
actual pressure lies above or below this area.
In order to set a switching window, the two
buttons SP and ▼ must be pressed
simultaneously before the power supply is
switched on.

Release these buttons again after the power
supply has been switched on and the display
test has run. The display will then show the
operating mode.

The cursor buttons ▲,▼can now be used to
change the operating mode until "FEn"
(standing for "Window") in the display. When
this has been done, press SP to store the
setting. The button SP can be used to display
the switching-point setting, which can be
modified by means of the cursor buttons ▼, ▲.

The distance between the switching point and
reset point is the switching window. If the
switching point is lower than the reset point, a
signal will be output as long as the pressure
lies within the preset window (case 1, rising
pressure). If the switching point is higher than
the reset point, a signal will be output as long
as the pressure lies outside the preset window
(case 2, rising pressure). In the case of falling
pressure, the signal is inverted.

Case 1

Case 2

Std = Standard mode, switching and reset

points adjustable

HYS = Hysteresis mode, switching point and

hysteresis adjustable

FEn = Window mode, switching window

adjustable

QQ

pp

QQ

pp

INSTRUCTION MANUAL

Off = Pressure within window

1

0

RP < SP

p

On = Pressure within window

SP < RP

p

1

0

Positive hysteresis

1

0

Switching point

p

Negative hysteresis

1

0

Switching point

p

ADJUSTING THE SWITCHING POINTS (SP)

AND RESET POINTS (RP)

Switching Characteristic Graphs

Signal “on” with rising pressure
Setting SP* > RP**

Explanation:

When the switching point (SP) is adjusted HIGHER than the reset point (RP), then the switching output will be “normally off”.
When the switching point (SP) is adjusted LOWER than the reset point (RP), then the switching output will be “normally on”.

p

SP

RP

t

t

U

Signal “on” with falling pressure
Setting SP < RP

Signal “off” with rising pressure
Setting RP > SP

p

RP

SP

t

t

U

p

RP

SP

U

A

t

t

Signal “off” with falling pressure
Setting RP < SP

p

SP

RP

U

A

t

t

* SP = Switching point
**RP = Reset point

Pressure display

Switching
function graph

Switching output LED

Raise switching
or reset point button

Lower switching
or reset point button

Reset point button

Switching point button

Position of operating elements

Cod Meaning Requested code or code programming
CLC Clear code Deletion of current code
txx Delay time Setting of filter time constant

(Buffering time) xx = Switching output delay

xx {03, 06, 12, 24, 50} in ms and
xx {O.1, 0.2, O.4} in s.

OFS Offset Request for of fset adjustment using ▼ and ▲ buttons
SC.H Short-cir cuit high Short-circuit monitoring activated

U. LO Voltage low Voltage monitoring activated
OFF Off Short-cir cuit or voltage monitoring deactivated

Std Standard mode Standard mode activated
HYS Hysteresis mode Hysteresis mode activated
FEn Window mode Window mode activated

U-C Voltage calibration Voltage output selected
I-C Current calibration Curr ent output selected

Display Meaning Cause / Remedy
SC.H Shor t-cir cuit high Short-circuit between output and power supply. Check wiring.

If the switching line from the load (e.g. electrical control
device, PLC or similar) is being held at an open-circuit
potential of > 3V, or if several pressure switches are being
operated in parallel, this function should be switched off.
Disconnection: ▼ during display test, then adjust with ▼ or ▲.

U.Lo Voltage low Power supply voltage too low (<17V).

Check power supply: Load may be too large.
Disconnection: ▲ during display test, then adjust with ▼ or ▲.

E RROR M ESSAGES

Display of hardware errors or malfunctions

Display of hardware errors or malfunctions (can be switched off)

Messages generated by calling SETUP functions

Display Meaning Cause / Remedy

O.Er Output error Error at switching output: Circuit-breaker defective, feedback loop

to processor open circuit. Repair necessary.

E.Er E2PROM error E2PROM module defective or connection to processor faulty.

Repair necessary.

I.Er Initialization error Checksum of initialization data incorrect. Remedy: Call up any

SETUP function and acknowledge the setting with SP.
This error message is caused by a data error. All setup values

should therefore be checked and corrected if necessary.
C.Er Calibration error Checksum of calibration data incorrect. Recalibration necessary.
SC.L Short-circuit low Short-circuit between output and ground. Check wiring:

Power supply may be too weak for connected load (leading

to collapse of voltage, particularly with loads with a high switch-on

current such as incandescent lamps or capacitances).
UFL Underflow The applied pressure is below the measuring range:

Increase pressure until it is within the measuring range.
OFL Overflow The applied pressure is above the measuring range:

Decrease pressure until it is within the measuring range.

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period
of 13 months from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace period to the
normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA ’ s customers
receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA ’ s Customer Service Department
will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by
OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY
does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling,
improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This W AR­RANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been dam­aged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misappli­cation; misuse or other operating conditions outside of OMEGA ’s control. Components, which wear, are not war­ranted, including but not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither
assumes responsibility for any omissions or errors nor assumes liability for any damages that result
from the use of its products in accordance with information provided by OMEGA, either verbal or
written. OMEGA warrants only that the parts manufactured by it will be as specified and free of
defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSO­EVER, EXPRESS OR IMPLIED, EXCEPT THA T OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING
ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HERE­BY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclu­sive, and the total liability of OMEGA with respect to this order, whether based on contract, war­ranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price
of the component upon which liability is based. In no event shall OMEGA be liable for consequen­tial, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical appli­cations or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical
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harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS / INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURN­ING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER
FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The
assigned AR number should then be marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage
in transit.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
©Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without
the prior written consent of OMEGA ENGINEERING, INC.

FOR W

ARRANTY RETURNS,
please have the following information available
BEFORE contacting OMEGA:

1. Purchase Order number under which the

product was PURCHASED,

2. Model and serial number of the product

under warranty, and

3. Repair instructions and/or specific problems

relative to the product.

FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have the following
information available BEFORE contacting OMEGA.

1. Purchase Order number to cover the COST
of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems relative
to the product.

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