User’s Guide www.omega.com e-mail: [email protected]
PSW18P SERIES
ELECTRONIC PRESSURE SWITCH FOR PNEUMATIC APPLICATIONS
OMEGAnet ® On-Line Service www.omega.com
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Toll Free in the United Kingdom: 0800 488 488 e-mail: [email protected]
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.
P N E U M A T I C , D I A P H R A G M - S T Y L E P R E S S U R E S W I T C H
PSW18P Series
APPLICATION
Ideal for Control of Air
FEATURES
Rugged Compact Design
Convenient Setpoint Adjustments
High Cycle Life
Vibration Resistant to 15g
UL and CSA Approved Microswitch
Gold Plated Contacts
SPECIFICATIONS
Ports/Mounting Plate 1/4" NPT
Adjustment Range See table
Proof Pressure*
Temperature Rating
1150 PSI (80 bar)
Ambient
Media
14° to 175° F (-10° to 80° C)
-4° to 175° F (-20° to 80° C)
Switching Element SPDT Microswitch
Max. Switching Rate 100 cycles/minute
Repeatability ±3%; for vacuum ±4%
Electrical Connector DIN 43650 Table A 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.
MATERIALS OF CONSTRUCTION
Aluminum Housing
Seal
A & B
C, D, E
Fluorocarbon / Buna-N
Buna-N
2 3 p
1
Terminals 1 - 2: Contacts open on rising pressure.
Terminals 1 - 3: Contacts close on rising pressure.
1.18 (30)
.79 (20)
Switch Adjustment
2.95 (75)
1.18 (30)
PART NUMBER IDENTIFICATION
PART NUMBER
PSW18PA
PSW18PB
PSW18PC
PSW18PD
PSW18PE
PRESSURE RANGE
PSI
-14 – 0
3 – 29
7 – 120
15 – 230
15 – 435
HYSTERESIS*
PSI
Lower Range Upper Range
2
2
4
4
15
*Note: Hysteresis is not adjustable. Maximum values are shown.
3
4
9
13
73
.61* (15.5)
All dimensions in inches (mm)
1 /
4
NPT
P N E U M A T I C , D I A P H R A G M - S T Y L E P R E S S U R E S W I T C H
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 media with pressure spikes and/or pulsating pressures, install a pressure snubber.
• For outdoor applications, sufficient protection must be provided.
Adjustment Of Switching Points
ADJUSTMENT OF SWITCHING POINT
Locking Screw
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.
MAKING AND BREAKING CAPACITY
LOAD
LEVEL*
Standard
(relays, solenoids)
Low
(electronic circuits)
TYPE
OF
CURRENT
AC
AC
DC
DC
AC
DC
TYPE
OF
LOAD
Resistive
Inductive
PF
≈
.7
Resistive
Inductive
L/R
≈
10 ms
Resistive
Inductive
L/R
≈
10 ms
VMIN MAXIMUM PERMANENT
[V] CURRENT IMAX [A] AT V
24 V 125 V 250 V
12
12
5
3
5
3
5
3
12
12
5
5
5
3
.34
.1
.4
.05
.08
_
_
_
.04
_
ELECTRICAL MECHANICAL
AT IMAX
5 x 10 switching cycles
2 x 10 switching cycles
*Load Level Explanation
PSW18P 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 I max approximately doubles contact life.
CONTACT LIFE
4
5
AT I
≈
0 approx 10 switching cycles approx 10 switching cycles
7
7
N O T E S
N O T E S
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 WAR-
RANTY 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 WHATSO-
EVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING
ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HERE-
BY 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 RETURN-
ING 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.
FOR WARRANTY 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.
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.
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