Omega Vehicle Security Switch PSW18H Seriers User Manual

User’s Guide  
www.omega.com  
e-mail: info@omega.com  
PSW 1 8 H SERIES  
HYDRAULIC, PISTON-STYLE PRESSURE SWITCH  
 
H Y D R A U L I C, P I S T ON - S T Y L E P R ES S U R E S W I T CH  
PSW18H Series  
APPLICATION  
Ideal for Control of Hydraulic, Lubricating and Light Fuel Oils  
FEATURES  
Rugged Compact Design  
Convenient Setpoint Adjustments  
High Cycle Life  
Vibration Resistant to 15g  
UL and CSA Approved Microswitch  
Gold Plated Contacts  
SPECIFICATIONS  
Ports  
Adjustment Range  
1/ 4" NPT or 7/ 16-20 UNF (SAE-4)  
70 to 1015 PSI (5 to 70 bar) and  
150 to 2320 PSI (10 to 160 bar)  
5800 PSI (400 bar)  
3
2
p
Proof Pressure*  
Temperature Rating  
Ambient  
Media  
Max. Viscosity  
Switching Element  
1
-13° to 175° F (-25° to 80° C)  
-13° to 175° F (-25° to 80° C)  
450 SSU (1000 mm2/ s)  
SPDT Microswitch  
Terminals 1 - 2: Contacts open on rising pressure.  
Terminals 1 - 3: Contacts close on rising pressure.  
Switch Adjustment  
Max. Switching Rate 100 cycles/ minute  
Repeatability ±3%  
Electrical Connector DIN Style Plug with Removable  
1.18 (30)  
.79 (20)  
2.95 (75)  
1.18 (30)  
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  
Housing  
Seal  
Aluminum / Steel  
Dynamic  
Static  
PTFE  
Buna-N  
Pressure port  
material:  
430 SS  
1/4 NPT, or  
7/16-20 UNF  
All dimensions in inches (mm)  
PART NUMBER IDENTIFICATION  
PART NUMBER  
PRESSURE RANGE  
PSI  
HYSTERESIS*  
PSI  
PORTS  
Female  
Lower Range  
Upper Range  
PSW18HA  
PSW18HB  
PSW18HC  
PSW18HD  
70 – 1015  
150 – 2320 (10 – 160)  
70 – 1015 (5 – 70)  
150 – 2320 (10 – 160)  
(5 – 70)  
260 (18)  
260 (18)  
260 (18)  
260 (18)  
290 (20)  
435 (30)  
290 (20)  
435 (30)  
1/ 4" NPT  
1/ 4" NPT  
7/ 16 – 20 UNF  
7/ 16 – 20 UNF  
Numbers in parentheses indicate measurement in bar.  
*Note: Hysteresis is not adjustable. Maximum values are shown.  
 
H Y D R A U L I C, P I S T ON - S T Y L E P R ES S U R E S W I T CH  
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.  
Adjustment Of Switching Points  
• 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  
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  
TYPE  
OF  
CURRENT  
TYPE  
OF  
LOAD  
VMIN  
[V]  
MAXIMUM PERMANENT  
CURRENT I [A] AT V  
CONTACT LIFE  
LOAD  
LEVEL*  
ELECTRICAL  
AT I  
MECHANICAL  
MAX  
AT I 0  
24 V  
125 V  
250 V  
MAX  
Standard  
(relays,  
solenoids)  
AC  
AC  
Resistive  
12  
12  
5
3
5
3
5
3
5 x 10 4  
switching  
cycles  
approx 10 7  
switching  
cycles  
Inductive  
PF .7  
DC  
DC  
Resistive  
12  
12  
5
3
.4  
_
_
Inductive  
L/ R 10 ms  
.05  
Low  
(electronic  
circuits)  
AC  
DC  
Resistive  
5
5
.34  
.1  
.08  
_
.04  
_
2 x 10 5  
switching  
cycles  
approx 10 7  
switching  
cycles  
Inductive  
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.  
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.  
Standard applications do not require the gold plating – which  
will decay naturally when switching larger electrical loads.  
 
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 dam-  
aged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misappli-  
cation; misuse or other operating conditions outside of OMEGA’s control. Components, which wear, are not war-  
ranted, including but not limited to contact points, fuses, and triacs.  
OMEGA is pleased to offer suggestions on the use of its various products. How ever, OMEGA neither  
assum es responsibility for any om issions or errors nor assum es liability for any dam ages that result  
from the use of its products in accordance w ith inform ation provided by OMEGA, either verbal or  
w ritten. OMEGA w arrants only that the parts m anufactured by it w ill 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 rem edies of purchaser set forth herein are exclu-  
sive, and the total liability of OMEGA w ith respect to this order, w hether based on contract, w ar-  
ranty, negligence, indem nification, strict liability or otherw ise, shall not exceed the purchase price  
of the com ponent upon w hich liability is based. In no event shall OMEGA be liable for consequen-  
tial, incidental or special dam ages.  
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 appli-  
cations 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,  
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  
under warranty, and  
3. Repair instructions and/or specific problems  
relative to the product.  
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 m ake running changes, not m odel changes, whenever an im provem ent is possible.  
This affords our custom ers the latest in technology and engineering.  
OMEGA is a registered tradem ark of OMEGA ENGINEERING, INC.  
©Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This docum ent m ay not be copied, photocopied,  
reproduced, translated, or reduced to any electronic m edium or m achine-readable form , in whole or in part, without  
the prior written consent of OMEGA ENGINEERING, INC.  
 
W h e re Do I Fin d Eve ry th in g I N e e d fo r  
Pro ce ss Me a su re m e n t a n d Co n tro l?  
O MEGA...O f Co u rse !  
TEMPERATURE  
Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies  
Wire: Thermocouple, RTD & Thermistor  
Calibrators & Ice Point References  
Recorders, Controllers & Process Monitors  
Infrared Pyrometers  
PRESSURE, STRAIN AN D FO RCE  
Transducers & Strain Gages  
Load Cells & Pressure Gages  
Displacement Transducers  
Instrumentation & Accessories  
FLO W / LEVEL  
Rotameters, Gas Mass Flow Meters & Flow Computers  
Air Velocity Indicators  
Turbine/ Paddlewheel Systems  
Totalizers & Batch Controllers  
p H/ CO N DUCTIVITY  
pH Electrodes, Testers & Accessories  
Benchtop/ Laboratory Meters  
Controllers, Calibrators, Simulators & Pumps  
Industrial pH & Conductivity Equipment  
DATA ACQ UISITIO N  
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  
EN VIRO N MEN TAL  
MO N ITO RIN G AN D CO N TRO L  
Metering & Control Instrumentation  
Refractometers  
Pumps & Tubing  
Air, Soil & Water Monitors  
Industrial Water & Wastewater Treatment  
pH, Conductivity & Dissolved Oxygen Instruments  
M-3348/ 0700  
 

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