W
O R L D
L
E A D E R
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E N S I N G
S
O L U T I O N S
25PS, 42PS, 44PS, 45PS and 46PS
Series Pressure Switches
Key Features
SPST or SPDT switch with normally
open or closed contacts
Electrically rated to 600 Vac (44/45PS)
High cycle life capability (42/44PS)
Factory calibrated pressure setpoints
from vacuum to 750 psig
Snap-acting stainless steel
hermetically sealed sensor
Available with environmentally
sealed switch
High current capability
This line of pressure switches is
designed for direct control of
motors and other demanding loads
requiring precise pressure settings.
Extended electrical capacities and
life cycles, in both environmentally
sealed and unsealed configurations,
encourage usage in the most rigor-
ous fan cycling and high/low
pressure protection applications.
Applications
Product Bulletin
Operation
The snap-acting stainless steel
diaphragm reverses its curvature
when pressurized to a customer
specified value. When the disc
snaps, it opens or closes a set of
electrical contacts by means of a
transfer pin. Resetting the switch
occurs automatically when pressure
drops below a preset value.
Product Selection Matrix
44PS - Wire Leads
44PS - 1/4" Quick Connects
100,000
250,000
Switch Life
Cycles
Application
Voltage
Environmental
Package
Model Number Termination
Sealed
Unsealed
The 25PS series is an automatic
reset pressure switch designed to
meet a broad variety of application
requirements. This series is avail-
Sealed
Unsealed
Sealed
Unsealed
Sealed
Unsealed
44PS - Wire Leads
42PS - Wire Leads or 1/4" Quick Connects
45PS - Wire Leads
45PS - 1/4" Quick Connects
45PS - Wire Leads
25PS - Wire Leads or 1/4" Quick Connects
480 - 600 Vac
28 Vdc - 240 Vac
able in SPST and SPDT, offers a
variety of pressure settings, port
fittings and electrical connections.
480 - 600 Vac
28 Vdc - 240 Vac
for 2.5 million cycles. In applica-
tions such as split room air condi-
tioning systems, the 46PS as a head
pressure control can result in signifi-
cant cost savings when used instead
of a pilot duty switch and relay.
2,500,000
480 Vac
120 Vac - 240 Vac
Sealed
Unsealed
Sealed
Unsealed
46PS - Wire Leads
46PS - Wire Leads or 1/4" Quick Connects
46PS - Wire Leads
46PS - Wire Leads or 1/4" Quick Connects
The 46PS pressure switch is capable
of breaking 2 amp loads at 480 Vac
Qualified by application current. Requires TI/customer specification closure and validation testing before application approval.
Electrical Ratings
Design Specifications 25PS, 42PS, 44PS, 45PS, 46PS
Vacuum to 750 psig
5000 psig
100,000 Cycles (25/45PS)
250,000 Cycles (42/44PS)
2,500,000 Cycles (46PS)
750 Vrms across open contacts
1554 Vrms terminals to fitting (25/42PS)
2200 Vrms terminals to fitting (44/45/46PS)
-20oF to 150oF / -28.9oC to 65.6oC (Leaded)
-40oF to 275oF / -40oCto135oC (QuickConnect)
-65oF to 275oF / -53.9oC to 135oC
UL Recognized File No. SA995
U.S.Guide No. SDFY2 / Canada No. SDFY8
PED CE0035 Module B/D
ENEC Certified
IP67 (Leaded)
Operating Pressure:
Burst Pressure:
Life at rated Current:
Dielectric Strength:
Ambient Temperature:
Fluid Temperature:
Agency Approvals:
Differential
Range
50 - 70
45 - 60
50 - 70
60 - 75
60 - 75
65 - 80
70 - 80
Minimum
Tolerance
Contact TI
5
7
10
10
10
15
Upper
Setpoint***
10" Hg Min - 18 psig
15-50 psig
51-120 psig
121-250 psig
251-350 psig
351-500 psig
501-750 psig
Standard
Pressure Ranges
*SPST - single pole, single throw.
SPDT - single pole, double throw
**Switch logic at atmospheric pressure
***Maximum UL recognized pressure rating is 750 psig:
non-UL ratings to 1000 psig.
25 amp rating for 25PS and 45PS only. For 42PS and
44PS, NC ratings same as NO ratings. Note 18 AWG.
Qualified by application current.
Validation testing required.
Differential = (Lower Setpoint / Upper Setpoint) x 100
Typical Dimensional Drawings 25PS, 42PS, 44PS, 45PS, 46PS
Quick Connect Construction
Leaded Construction
.250 x .032
straight male spade terminal
to mate with Amp #41800 female
or equivalent
All dimensions in inches.
25/42PS
SPST
25/42PS
SPDT
NO
NC
NO
NC
15
15
15
15
13
13
5.8
13
10
25
5
25
10
10
2.9
10
45
45
17.4
45
720
720
278
720
Device
Switch
Type**
5-28 Vdc
Amps
Inductive
F
L
A
L
R
A
VA
Pilot
Duty
240 Vac
.122
.54
1.16
1.50
1.06
.54
2.00
1.27
Amps
Res
13
25
10
25
65
60
34.8
60
120 Vac
480
480
278
480
F
L
A
L
R
A
VA
Pilot
Duty
Amps
Res
F
L
A
L
R
A
F
L
A
L
R
A
44/45/46PS
SPST
44/45PS
SPDT
NO
NC
NO
NC
15
15
15
15
13
13
5.8
13
10
25
5
25
10
10
2.9
10
45
45
17.4
45
720
720
278
720
13
25
10
25
65
60
34.8
60
480
480
278
480
4
4
24
24
3.2
3.2
19.2
19.2
480 Vac
600 Vac
Standard Fittings, others are available
Normally open contact on double throw switch is rated 5.8/2.9 Amps.
Contact Marketing for additional product information.
1/4-18 NPTF-1A
.83
(21)
.27(6.9)
.40 (10.2) MIN.
TH'D. LG.
9/16 (14.3) HEX
1/8-27 NPTF-1A
.63
(16)
.27 (6.9)
.26 (6.6) MIN.
TH'D LG.
9/16 (14.3) HEX
9/16 (14.3) HEX
7/16-20 UNF-2B
.09 (2.3) DIA.
.53
(13.5)
.26 (6.6) MIN.
TH'D LG.
.36
(9.1)
.375
(9.5)
.093 DIA.
(2.4)
.250 DIA.
(6.4)
.9 MIN.
(22.9)
.093 DIA.
(2.4)
.093 DIA.
(2.4)
.250
(6.4)
.9 MIN.
(22.9)
.098.002 DIA.
.105.003 DIA.
.172.005 DIA.
(2.50.05)
(2.70.07)
(4.40.13)
.56 DIA.
(14.3)
1.27.02
(32.30.51)
.275.002
(70.05)
2.074.030
(52.680.76)
A
B
C
.77/.73
(19.6/18.5)
.4245/.4193 DIA.
(10.782/10.650)
M10 X 1.25
Female O-ring
.080/.100 DIA.
(2.03/2.54)
.417/.402
(10.59/10.21)
.496 (12.6)
MIN.
FULL TH'D
1/4" Male Pipe Thread
1/8" Male Pipe Thread
1/4" Female Flare with Deflator
Capillary Tube Fitting (3 Configurations)
Tube Fitting (4 Configurations)
Female O-Ring
.125 (3.2)
.205.010
(5.20.3)
.234-.238
(6)
.145.010
(3.70.25)
.197 DIA.
(5)
A
B
C
D
.370.010
(9.40.3)
.250 DIA.
(6.4)
.250 DIA.
(6.4)
.140.010
(3.50.3)
Complete Product Directory of Texas Instruments Hermetic Pressure Switches
Narrow differential, tight tolerance
Dry circuit capability, extended life cycle
Dry circuit capability, extended life cycle
Narrow differential, tight tolerance
Extended life cycle
High current loads
High current loads
Extended life cycles at high current
Extended life cycles, sealed configuration
High current in sealed configuration
High current loads
Trip free manual reset
Narrow differential, tight tolerance
Small, lightweight
High current loads
Extended life cycles
Extended life cycles, sealed configuration
High current in sealed configuration
Extended cycle life
Extended cycle life at high voltage
High voltage capability
Extended cycle life
36PS
39PS
41PS
25PS
42PS
44PS
45PS
20PS
29PS
36PS
PS80
25PS
42PS
44PS
45PS
46PS
44PS
45PS
46PS
Auto Reset
Auto Reset
Auto reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Manual Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
SPST
SPST
SPST
SPST
SPST
SPST
SPST, SPDT
SPST, SPDT
SPST, SPDT
SPST, SPDT
SPST
SPST
SPST
SPST
SPST, SPDT
SPST, SPDT
SPST, SPDT
SPST, SPDT
SPST, SPDT
SPST
SPST
SPST
5-28 Vdc
5-28 Vdc
5-28 Vdc
5-28 Vdc
5-28 Vdc
5-28 Vdc
28 Vdc
28 Vdc
28 Vdc
28 Vdc
120/240 Vac
120/240 Vac
120/240 Vac
240 Vac
120/240 Vac
120/240 Vac
120/240 Vac
120/240 Vac
120/240 Vac
480/600 Vac
480/600 Vac
480 Vac
5-400 mA
5-400 mA
5-400 mA
400 mA-2 A
400 mA-2 A
400 mA-2 A
15 A
15 A
15 A
15 A
5.8/2.9 A
6.0/2.9 A
5.8/2.9 A
6.0 A
13/10 A
13/10 A
13/10 A
13/10 A
13/10 A
4.0/3.2 A
4.0/3.2 A
2 A
1,000
>250
>100
250
250
250
100
250
250
100
100
10
100
100
100
250
250
100
1,000+
250
100
1,000+
Model
Switch
Operation
Switch
Configuration
Application
Voltage
Electrical
Current
Switch
Life Cycles
(K)
Features
DC Voltage (<28V), Low Current
DC Voltage (<28V), High Current
AC Voltage (<240V), Low Current
AC Voltage (<240V), High Current
High AV Voltage (<600V), High Current
36PS
40PS
20PS
Company Name and Address
Contact
Phone Fax Email
Description of Application
Exact Function of Switch in System
Cut In Pressure Tolerance Cut Out Pressure Tolerance
Pressure Port Fitting Switch Termination
Wire Lead Termination (e.g., 1/2 inch strip, 1/4 inch female Q.C, etc.)
Sustained System Pressure Peak System Pressure
Switch Logic (Contacts to open / close on Pressure Rise)
Volts (AC/DC) Amps Inductive / Resistive
Cycle Life Requirement Operating Temperature
Allowable Drift Over temperature / Life
Switch Environment (Protected/Unprotected)
Agency Approvals (UL, VDE, TUV, ?) Estimated Annual Volume
Important Notice: Texas Instruments (TI) reserves the right to make changes to or to discontinue any product or
service identified in this publication without notice. TI advises its customers to obtain the latest version of the
relevant information to verify, before placing orders, that the information being relied upon is current.
Texas Instruments assumes no responsibility for infringement of patents or rights of others based on Texas Instruments
applications assistance or product specifications since TI does not possess full access concerning the use or applica-
tion of customers' products. Texas Instruments also assumes no responsibility for customers' product designs.
When completed please return to:
Texas Instruments Incorporated
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Attleboro, MA 02703-0964
Phone: 508-236-3800
Fax: 508-236-2349
Email: tisensors@ti.com
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Sample Request Data Form (Please complete as much as possible)
2002 Texas Instruments Incorporated
Printed in U.S.A. 12-2002
MCFS007
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