
DIFFERENTIAL PRESSURE GAUGES 
UNI-DIRECTIONAL OR BI-DIRECTIONAL
PGD-45 Series
20 to 500 psi 
Uni-directional or Bi-directional
Starts at
$
900
 Heavy-Duty Construction 
 Double-Strength,
Shatter-Resistant Glass
 2-1-2% ANSI Grade A
Accuracy
OMEGA’s PGD Series differential 
pressure gauges are rugged 
industrial gauges that indicate the 
difference between 2 input 
connections. Differential ranges 
provide the maximum resolution for 
applications in which one input is 
always at a higher pressure than 
the other. In cases in which one 
input can be higher or lower than 
the other, a bi-directional differential 
range should be used.
The PGD Series is constructed with 
2 independent Bourdon tubes. The 
opposing Bourdon tubes are linked
PGD-45B-30/30, $910, 
shown smaller than 
actual size. See next 
page for dimensions.
to a single pinion gear that rotates a 
pointer for direct pressure readings. 
By using 2 independent Bourdon 
tubes, the gauge can handle liquids 
or gases on either or both ports.
The large 4 
pressure easy. Each gauge is 
equipped with a micrometer 
adjustment for rezeroing the gauge. 
Gauges are available with ports 
located in the lower (six o’clock) 
position or in the rear (for panel 
mounting).
1
⁄2" dial makes reading
PGD-45L-30, $900, 
shown smaller than 
actual size. See next 
page for dimensions.
PGD Series gauges are 
available with ports located 
in the back of the gauge 
(shown at left), or in the 
lower (six o’clock) position 
(shown at right).
SPECIFICATIONS
Accuracy: 2-1-2%, ANSI Grade A
2% first 10%, 1% middle 80%, 
2% top 10%
Dial Size: 4 
Dial Arc: 210° 
Window: Double-strength glass 
Connection: 
Sensor Type: Bourdon tube 
Wetted Parts:
Tube: Bronze
Fittings: Brass 
Case: Black epoxy-coated aluminum 
Operating Temperature: 65°C (150°F) 
Weight: 1.4 kg (3 lb)
1
⁄2"
1
⁄4 MNPT
G-63

DIMENSIONS IN in. 
DIMENSIONS IN (mm)
A B
C
1/4 NPT
 15.08 (0.5938)
SQ. FLATS (15)
J
NUTS AND BOLTS 
NOT SUPPLIED
A
ON
JJ
KKC-1
K
3-“L” HOLES DIA. EQUALLY SPAC E D 
ON “E” DIA. BOLT CIRCLE 
K
D
H
M
F
KK
G
DIFFERENTIAL OR BI-DIRECTIONAL RANGES
PRESSURE
GAUGES
G
Dimensions: mm (in)
PGD-45B-30/30, $910, shown 
smaller than actual size. See 
below for dimensions.
PGD-45L-30, $900, 
shown smaller than 
actual size. See below 
for dimensions.
To Order (Specify Model Number)
MODEL NO. DIAL SIZE CONNECTION PRICE
PGD-45B-(*) 4 
PGD-45L-(*) 4
Insert range code from table at right.
*
Ordering Example: PGD-45B-30, 114 mm (4 
with back input connection and 0 to 30 psi uni-directional range, $910.
Dimensions: mm (in)
1
⁄
2" Back $910
1
⁄
2" Lower 900
1
⁄2") differential pressure gauge
MOST POPULAR RANGES HIGHLIGHTED!
RANGE RANGE FIGURE MINOR STATIC PRES.
CODE (psi) INTERVAL GRADUATION LIMIT (psi)*
20 0/20 5 0.2 30
30 0/30 5 0.5 60
60 0/60 10 1 120
100 0/100 10 1 200
200 0/200 20 2 300
600 0/600 100 10 900
1K 0/1000 100 10 1500
15/15 15/0/15 5 0.5 60
30/30 30/0/30 10 1 120
50/50 50/0/50 10 1 200
100/100 100/0/100 20 2 300
200/200 200/0/200 50 5 600
500/500 500/0/500 100 10 1500
Maximum pressure that can be applied to either port on the gauge.
*
PGD-FMR, black flush mount ring for panel mounting, $25.
GAUGE
SIZE ABCC1 DEFGHJKLM NOJJ KK
41⁄2"
149 82 126 149 26 137 27 91  40  5 15 6  125  17  17 3 148
(57⁄8) (31⁄32) (415⁄16) (57⁄8) (11⁄16) (53⁄8) (11⁄16) (39⁄16) (19⁄16)(3⁄16)(19⁄32)(7⁄32) (415⁄16)(21⁄32)(21⁄32)(1⁄8) (513⁄16)
Recommended Reference Book: Liquid Filtration, CM-4427, $105.
Visit omega.com/bobi for Additional Books
G-64

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