Omega Products PSW18H Installation Manual

User’s Guide

www.omega.com

e-mail: [e-mail]

PSW18H SERIES

HYDRAULIC, PISTON-STYLE PRESSURE SWITCH

OMEGAnet®On-Line Service Internet e-mail
www.omega.com [e-mail]

Servicing North America:

USA: One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford, CT 06907-0047

TEL: [phone] FAX: [phone]
e-mail: [e-mail]

Canada: 976 Bergar

Laval (Quebec) H7L 5A1
TEL: [phone] FAX: [phone]
e-mail: [e-mail]

For immediate technical or application assistance:

USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA

®

Customer Service: 1-800-622-2378 / 1-800-622-BEST

®

Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

®

TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA

Mexico: [phone]-6342 FAX: [phone]

En Espanol: [phone]-7803 e-mail: [e-mail]

[e-mail]

Servicing Europe:

Benelux: Postbus 8034, 1180 LAAmstelveen, The Netherlands

TEL: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [e-mail]

Czech Republic: Rudé armády 1868, 733 01 Karviná

TEL: [phone] FAX: [phone]
Toll Free in Czech Rep.: 0800-1-66342 e-mail: [e-mail]

France: 9, rue Denis Papin, 78190 Trappes

Tel: [phone] FAX: [phone]
Toll Free in France: 0800-4-06342
e-mail: [e-mail]

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

Tel: [phone] FAX: [phone]
Toll Free in Germany: 0800-TC-OMEGA
e-mail: [e-mail]

United Kingdom: One Omega Drive, River Bend Technology Centre
ISO 9002 Certified Northbank, Irlam, Manchester

M44 5EX, United Kingdom
Tel: [phone] FAX: [phone]
Toll Free in the United Kingdom: 0800 488 488
e-mail: [e-mail]

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGAis constantly pursuing certification of
its products to the European New Approach Directives. OMEGAwill add the CE mark to every appropriate device upon certification.
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.

PART NUMBER PRESSURE RANGE HYSTERESIS* PORTS

PSI PSI

Lower Range Upper Range Female

PSW18HA 70 – 1015 (5 – 70) 260 (18) 290 (20) 1/4" NPT
PSW18HB 150 – 2320 (10 – 160) 260 (18) 435 (30) 1/4" NPT
PSW18HC 70 – 1015 (5 – 70) 260 (18) 290 (20) 7/16 – 20 UNF
PSW18HD 150 – 2320 (10 – 160) 260 (18) 435 (30) 7/16 – 20 UNF

Numbers in parentheses indicate measurement in bar.
*Note: Hysteresis is not adjustable. Maximum values are shown.

MATERIALS OF CONSTRUCTION

Housing Aluminum / Steel
Seal

Dynamic PTFE
Static Buna-N

SPECIFICATIONS

Ports 1/4" NPT or 7/16-20 UNF (SAE-4)
Adjustment Range 70 to 1015 PSI (5 to 70 bar) and

150 to 2320 PSI (10 to 160 bar)

Proof Pressure* 5800 PSI (400 bar)
Temperature Rating

Ambient -13° to 175° F (-25° to 80° C)

Media -13° to 175° F (-25° to 80° C)
Max. Viscosity 450 SSU (1000 mm2/s)
Switching Element SPDT Microswitch
Max. Switching Rate 100 cycles/minute
Repeatability ±3%
Electrical Connector DIN Style Plug with Removable

Cable Plug Adapter

*Note: Do not subject switch to proof pressure during normal operation.

Even short pressure peeks must not exceed proof pressure.

FEATURES

Rugged Compact Design
Convenient Setpoint Adjustments
High Cycle Life
Vibration Resistant to 15g
UL and CSA Approved Microswitch
Gold Plated Contacts

APPLICATION

Ideal for Control of Hydraulic, Lubricating and Light Fuel Oils

Terminals 1 - 2: Contacts open on rising pressure.
Terminals 1 - 3: Contacts close on rising pressure.

All dimensions in inches (mm)

2

3

1

p

.79 (20)

1.18 (30)

.59 (15)

.21 (5.3)

.31

(8)

2.83 (72)

1.18 (30)

2.95 (75)

Switch Adjustment

1

/4 NPT, or

7/16-20 UNF

Pressure port
material:
430 SS

PART NUMBER IDENTIFICATION

PSW18H Series

HYDRAULIC, PISTON-STYLE PRESSURE SWITCH

MAKING AND BREAKING CAPACITY

SWITCH SELECTION AND MOUNTING INSTRUCTIONS

• Select a switch such that the desired switching point falls roughly

in the middle of the adjustment range.

• Do not exceed switch electrical ratings. Use an appropriately sized relay when

switching larger electrical loads.

• For liquid media with pressure spikes and/or pulsating pressures, install a

pressure snubber.

• For outdoor applications, sufficient protection must be provided.

ADJUSTMENT OF SWITCHING POINT

Either the upper or the lower switching point may be adjusted.
The opposite one is then fixed by the hysteresis characteristics of the switch.
Use a pressure gauge for exact adjustment. Proceed as follows:

1. Loosen locking screw.

2. Adjust the switching point using a 5-mm hexagon wrench.

Clockwise rotation increases switching pressure and
counter-clockwise rotation decreases switching pressure.
Low-end of adjustment range is reached when top of
adjustment barrel is approximately level with top of switch
housing. High-end of adjustment range is reached when
adjustment barrel is fully CW.

3. Re-tighten locking screw.

TYPE TYPE VMIN MAXIMUM PERMANENT CONTACT LIFE

LOAD OF OF [V] CURRENT I

MAX

[A] AT V ELECTRICAL MECHANICAL

LEVEL* CURRENT LOAD

24 V 125 V 250 V

AT I

MAX

AT I ≈ 0

Standard AC Resistive 12 5 5 5 5 x 10

4

approx 10

7

(relays, switching switching

solenoids) AC Inductive 12 3 3 3 cycles cycles

PF ≈ .7
DC Resistive 12 5 .4 _
DC Inductive 12 3 .05 _

L/R ≈ 10 ms

Low AC Resistive 5 .34 .08 .04 2 x 10

5

approx 10

7

(electronic switching switching

circuits) DC Inductive 5 .1 _ _ cycles cycles

L/R ≈ 10 ms

*Load Level Explanation
PSW18H Series pressure switches have microswitch

contacts with gold plating over silver base metal. The gold
plating remains intact when “low level” voltage / current
levels are observed. This feature assures highly reliable
switching in low-level electronic circuits.

Standard applications do not require the gold plating – which
will decay naturally when switching larger electrical loads.

Notes:

1. Reference conditions:
30 cycles per min and 86°F (30°C) ambient.

2. Reducing load current to 50% of Imax approximately
doubles contact life.

Adjustment Of Switching Points

Locking Screw

HYDRAULIC, PISTON-STYLE PRESSURE SWITCH

NOTES

NOTES

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
application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic
WARRANTY / DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA
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.

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA...Of Course!

TEMPERATURE

✔ Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies

✔ Wire: Thermocouple, RTD & Thermistor
✔ Calibrators & Ice Point References
✔ Recorders, Controllers & Process Monitors
✔ Infrared Pyrometers

PRESSURE, STRAIN AND FORCE

✔ Transducers & Strain Gages
✔ Load Cells & Pressure Gages
✔ Displacement Transducers
✔ Instrumentation & Accessories

FLOW/LEVEL

✔ Rotameters, Gas Mass Flow Meters & Flow Computers
✔ Air Velocity Indicators
✔ Turbine/Paddlewheel Systems
✔ Totalizers & Batch Controllers

pH/CONDUCTIVITY

✔ pH Electrodes, Testers & Accessories
✔ Benchtop/Laboratory Meters
✔ Controllers, Calibrators, Simulators & Pumps
✔ Industrial pH & Conductivity Equipment

DATA ACQUISITION

✔ Data Acquisition & Engineering Software
✔ Communications-Based Acquisition Systems
✔ Plug-in Cards for Apple, IBM & Compatibles
✔ Datalogging Systems
✔ Recorders, Printers & Plotters

HEATERS

✔ Heating Cable
✔ Cartridge & Strip Heaters
✔ Immersion & Band Heaters
✔ Flexible Heaters
✔ Laboratory Heaters

ENVIRONMENTAL
MONITORING AND CONTROL

✔ Metering & Control Instrumentation
✔ Refractometers
✔ Pumps & Tubing
✔ Air, Soil & Water Monitors
✔ Industrial Water & Wastewater Treatment
✔ pH, Conductivity & Dissolved Oxygen Instruments

M-3348/0700