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
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EN VIRO N MEN TAL
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M-3348/ 0700
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