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DIFFERENTIAL PRESSURE SWITCH –
INCHES OF WATER
DIFFERENTIAL PRESSURE SWITCH – PSID
A
Ø 0.28
(3 Holes)
D
C
G
E
B
H
3/4 NPT
1/4 NPT
Female
1/4 NPT
Female
A
Ø 0.28
(3 Holes)
C
1/4 NPT
High
Pressure
Inlet
1/4 NPT
Low Pressure
Inlet
B
D
E
F
H
G
3/4 NPT
C
A
U
T
I
O
N
T
O
P
R
E
V
E
N
T
I
G
N
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T
I
O
N
O
F
H
A
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A
R
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.
C
D
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H
I
0.28 THRU
(3 PLACES)
1/4 NPT
FEMALE
3/4 NPT
(2 PLACES)
B
A
1/4 NPT
FEMALE
®
C
A
U
T
I
O
N
T
O
P
R
E
V
E
N
T
I
G
N
I
T
I
O
N
O
F
H
A
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.
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E
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E
E
N
S
E
R
V
I
C
E
.
B
A
C
H
D
E
F
G
0.28 THRU
(3 PLACES)
3/4 NPT
(2 PLACES)
1/4 NPT
LOW PRESSURE
INLET
1/4 NPT HIGH
PRESSURE
INLET
®
DSW490B
DSW490B
PSW790B
PSW790B
DIMENSIONS (Inches) – PSID Ranges
STYLE A B C D E F G H
DSW490B 4.0 3.25 3.31 2.75 2.31 1.19 2.31 2.27
DSW790B 7.78 5.20 4.38 3.88 3.58 1.22 2.31 .312
DIMENSIONS (Inches) – ˝H
2
O Differential Ranges
STYLE A B C D E F G H I
DSW490B 5.69 4.0 3.25 3.31 5.13 – 1.43 2.75 –
DSW790B 6.38 5.20 4.38 3.88 3.96 1.22 – .312 5.13