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EIGHT STEPS TO SELECTING A PRESSURE, DIFFERENTIAL PRESSURE OR TEMPERATURE SWITCH
Ashcroft offers several different pressure, differential pressure and temperature switch models. This guide will help you select the best model for your application. In many cases there may be more than one choice, so the lower cost option is usually the best choice. As a guideline a NEMA 7 rated switch will cost more than a NEMA 4 rated switch. A Stainless Steel housing will cost more than a die cast Aluminum or Brass housing. A dual chamber design more than the standard housing.The Eight Steps:
1. Does the applications require an Explosion Proof (NEMA 7) housing or a Watertight (NEMA 4) housing?
2. Do you need single or dual set points?3. Do you need fixed or adjustable dead band?4. Do you need an adjustable set point switch or a
factory set only switch (this step is only for Pressure Switches)?
5. Select the appropriate switch model listed in the step 5 boxes in the pressure, differential pressure or temperature switch selection charts. This selection would be based on comparing the basic size and features of the switch models listed in the box based on your choices for the first 4 steps. Refer to the appropriate switch product matrix or catalog page for more information on the switch models.
6. Determine the operation range needed from the appropriate switch model range charts.
7. Select the appropriate micro switch based on your electrical requirements and deadband requirements.
8. Select the wetted materials and process connection based on your process media and piping.
At this point you should be able to build the appropriate switch part number by following the “How to order this switch” section on the appropriate catalog page. Additional switch options should also be added to the part number.
Rev. A 07/15, Page 1 of 6
Product Information Page
Ashcroft® Switches
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
© 2015 Ashcroft Inc.
ashcroft.com
1.800.328.8258
Applicable to:
PIP #: SW-PI-70A
Rev. A 07/15, Page 2 of 6
Product Information Page
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
© 2015 Ashcroft Inc.
ashcroft.com
1.800.328.8258
PR
ES
SU
RE
SW
ITC
H S
EL
EC
TIO
NS
TE
PN
UM
BE
R
21. 3 4 5
EN
CL
OS
UR
ET
YP
E
Exp
losi
on
Pro
of
(NE
MA
7)
Wat
erti
gh
t (N
EM
A 4
)
Du
al
S
ing
le
Sin
gle
Du
al
Fix
ed
A
dju
stab
le
Fact
ory
F
ield
Set
On
ly
A
dju
stab
lity
.
Fie
ld
Fac
tory
A
dju
stab
lity
S
et O
nly
Ad
just
able
Fix
ed
SE
TP
OIN
TS
SET
POIN
TAD
JUST
ABIL
ITY
FIX
ED
DE
AD
B
AN
DO
NLY
DE
AD
BA
ND
D
EA
DB
AN
D
APA
N7
B7
FP
S N
7P
PS
N7
PPA
N7
NPA
N7
PP
D N
7L
PD
N4
GP
D N
4
LPA
N4
GPA
N4
NPA
N4
NP
I N4
APA
N4
B4
LP
S N
4G
PS
N4
H4
AP
S N
7
6.
Det
erm
ine
the
oper
atio
n ra
nge
need
ed fr
om th
e ap
prop
riate
sw
itch
mod
el ra
nge
char
ts.
7.
Sel
ect t
he a
ppro
pria
te m
icro
sw
itch
base
d on
you
r ele
ctric
al re
quire
men
ts a
nd d
ead
band
requ
irem
ents
.
8.
Sel
ect t
he w
ette
d m
ater
ials
and
pro
cess
con
nect
ion
base
d on
you
r pro
cess
med
ia a
nd p
ipin
g.
At t
his
poin
t you
sho
uld
be a
ble
to b
uild
the
appr
opria
te s
witc
h pa
rt nu
mbe
r by
follo
win
g th
e “H
ow to
ord
er th
is s
witc
h”
sec
tion
on th
e ap
prop
riate
cat
alog
pag
e. A
dditi
onal
sw
itch
optio
ns s
houl
d al
so b
e ad
ded
to th
e pa
rt nu
mbe
r.
FIX
ED
DE
AD
B
AN
DO
NLY
SET
POIN
TAD
JUST
ABIL
ITY
SE
TP
OIN
TS
APA
N4
AP
S N
4
Rev. A 07/15, Page 3 of 6
Product Information Page
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
© 2015 Ashcroft Inc.
ashcroft.com
1.800.328.8258
PR
ES
SU
RE
SW
ITC
H P
RO
DU
CT
MA
TR
IX
ENCL
OSUR
E / P
ROCE
SS IN
PUT
CONT
ROL
FUNC
TION
SW
ITCH
TYP
E W
ETTE
D M
ATER
IAL
RANG
ES
B4
H
4
B
7
PP
A
P
PD
P
PS
LP
A
LP
D
LP
S
GP
A
G
PD
G
PS
FP
S
A
PA
A
PS
N
PA
N
PI
Watertight (NEMA 4)
Explosion Proof (Nema 7)
Stainless Steel Body
Pressure
Differential Pressure
Temperature
Single Fixed Setpoint
Single Adjustable Setpoint
Adjustable Deadband
Two Indep. Adjust. Setpoints
Fixed Deadband
General Purpose
Narrow Deadband
Hermetically Sealed
Manual Reset
Relay
DPDT
Buna
Viton
Teflon
Stainless Steel
Monel
Vacuum
Compound Inches of Water
Inches of Water
Compound
0-400 psi
0-600 psi
1000 psi
2000 psi
3000 psi
4000 psi
5000-20,000 psi
-40 –750°F
5000
7500
Rev. A 07/15, Page 4 of 6
Product Information Page
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
© 2015 Ashcroft Inc.
ashcroft.com
1.800.328.8258
DIF
FE
RE
NT
IAL
PR
ES
SU
RE
SW
ITC
H S
EL
EC
TIO
NS
TE
PN
UM
BE
R
2.1. 3. 4.
EN
CL
OS
UR
ET
YP
E
Exp
losi
on
Pro
of
(NE
MA
7)
Wat
erti
gh
t (N
EM
A 4
)
Du
al
S
ing
le
Sin
gle
Du
al
Fix
ed
A
dju
stab
le
Ad
just
able
Fix
ed
SE
TP
OIN
TS
FIX
ED
DE
AD
B
AN
DO
NLY
DE
AD
BA
ND
D
EA
DB
AN
D
D7
PD
S N
7P
DA
N7
PD
D N
7L
DD
N4
GD
D N
4L
DA
N4
GD
A N
4
D4
LDS
N4
GD
S N
4
5.
Det
erm
ine
the
oper
atio
n ra
nge
need
ed fr
om th
e ap
prop
riate
sw
itch
mod
el r
ange
cha
rts.
6.
Sel
ect t
he a
ppro
pria
te m
icro
sw
itch
base
d on
you
r el
ectr
ical
req
uire
men
ts a
nd d
ead
band
req
uire
men
ts.
7.
Sel
ect t
he w
ette
d m
ater
ials
and
pro
cess
con
nect
ion
base
d on
you
r pr
oces
s m
edia
and
pip
ing.
At t
his
poin
t you
sho
uld
be a
ble
to b
uild
the
appr
opria
te s
witc
h pa
rt n
umbe
r by
follo
win
g th
e “H
ow to
ord
er th
is s
witc
h”
sec
tion
on th
e ap
prop
riate
cat
alog
pag
e. A
dditi
onal
sw
itch
optio
ns s
houl
d al
so b
e ad
ded
to th
e pa
rt n
umbe
r.
FIX
ED
DE
AD
B
AN
DO
NLY
SE
TP
OIN
TS
Rev. A 07/15, Page 5 of 6
Product Information Page
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
© 2015 Ashcroft Inc.
ashcroft.com
1.800.328.8258
DIF
FER
EN
TIA
L P
RE
SS
UR
E S
WIT
CH
PR
OD
UC
T M
AT
RIX
EN
CLOS
URE
/ PRO
CESS
INPU
T CO
NTRO
L FU
NCTI
ON
SWIT
CH T
YPE
WET
TED
MAT
ERIA
L RA
NGES
D4
D
7
PD
A
P
DD
P
DS
LD
A
LD
D
LD
S
GD
A
G
DD
G
DS
Watertight (NEMA 4)
Explosion Proof (Nema 7)
Stainless Steel Body
Pressure
Differential Pressure
Temperature
Single Fixed Setpoint
Single Adjustable Setpoint
Adjustable Deadband
Two Indep. Adjust. Setpoints
Fixed Deadband
General Purpose
Narrow Deadband
Hermetically Sealed
Manual Reset
Relay
DPDT
Buna
Viton
Teflon
Stainless Steel
Monel
Vacuum
Compound Inches of Water
Inches of Water
Compound
0-400 psi
0-600 psi
1000 psi
2000 psi
3000 psi
4000 psi
5000-20,000 psi
-40 –750°F
Rev. A 07/15, Page 6 of 6
Product Information Page
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
© 2015 Ashcroft Inc.
ashcroft.com
1.800.328.8258
TE
MP
ER
AT
UR
E S
WIT
CH
SE
LE
CT
ION
ST
EP
NU
MB
ER
2.1. 3. 4.
EN
CL
OS
UR
ET
YP
E
Exp
losi
on
Pro
of
(NE
MA
7)
Wat
erti
gh
t (N
EM
A 4
)
Du
al
S
ing
le
Sin
gle
Du
al
Fix
ed
A
dju
stab
le
Ad
just
able
Fix
ed
SE
TP
OIN
TS
FIX
ED
DE
AD
B
AN
DO
NLY
DE
AD
BA
ND
D
EA
DB
AN
D
T7
PT
S N
7 P
TA N
7 P
TD
N7
LTD
N4
GT
D N
4LT
A N
4 G
TA N
4
T4
LTS
N4
GT
S N
4
5.
Det
erm
ine
the
oper
atio
n ra
nge
need
ed fr
om th
e ap
prop
riate
sw
itch
mod
el r
ange
cha
rts.
6.
Sel
ect t
he a
ppro
pria
te m
icro
sw
itch
base
d on
you
r el
ectr
ical
req
uire
men
ts a
nd d
ead
band
req
uire
men
ts.
7.
Sel
ect t
he w
ette
d m
ater
ials
and
pro
cess
con
nect
ion
base
d on
you
r pr
oces
s m
edia
and
pip
ing.
At t
his
poin
t you
sho
uld
be a
ble
to b
uild
the
appr
opria
te s
witc
h pa
rt n
umbe
r by
follo
win
g th
e “H
ow to
ord
er th
is s
witc
h”
sec
tion
on th
e ap
prop
riate
cat
alog
pag
e. A
dditi
onal
sw
itch
optio
ns s
houl
d al
so b
e ad
ded
to th
e pa
rt n
umbe
r.
FIX
ED
DE
AD
B
AN
DO
NLY
SE
TP
OIN
TS
