Product Overview
57
Differential Pressure Switches
PRESSURE
DWYER INSTRUMENTS, INC. | dwyer-inst.com
WET/WET DIFFERENTIAL PRESSURE SWITCH
NEMA 4X Enclosure, Low Differential Set Points
The Series DX Wet/Wet Differential Pressure Switch makes a contact output based
on the differential between two pressure sources. Wetted materials of brass and
uoroelastomer are suitable for use with most gases and water based solutions. The
switch can be used for low differential pressure indication with set point on a decrease
of pressure as low as 1 psid (0.07 bar). Differential set point ranges are available
from 2.5 to 75 psid (0.17 to 5.17 bar) on increasing differential pressure and 1.0 to
67 psid (0.07 to 4.62 bar) on decreasing differential pressure. Unit features a high
static pressure rating of 200 psig (13.8 bar). Weatherproof, UL type 4X, enclosure for
dust laden, outdoor, or wash-down installation environments. Externally adjustable set
point, integral mounting ange and a removable electrical terminal block for quick and
easy installation.
FEATURES/BENEFITS
• Differential pressure switch that is suitable for most gas and water-based applications
allows multiple uses in the most sophisticated designs
• Weatherproof housing provides protection in the harsh, wet or dirty environments
ensuring switch’s long-service life
• Removable terminal block reduces installation time
APPLICATIONS
• Indicating lter condition
• Proof of ow indicator monitoring
• Proving ow through a pump
59/64
[23.50]
4-29/64
[113.03]
47/64
[18.80]
3/4
[19.05]
1-13/16
[46.05]
13/64 [5.08]
2-1/2
[63.50]
15/64
[6.00]
1-13/32
[35.56]
35/64 [13.97]
2X
47/64
[18.54]
1-27/64
[36.30]
2-55/64
[72.59]
1-11/32
[34.04]
9/16
[14.10]
1-13/64
[45.85]
DOUBLE BELLOWS DIFFERENTIAL PRESSURE SWITCH
Visible Set Points, Adjustable or Fixed Deadband, High Pressure Ranges
Two opposing bellows combine maximum sensitivity and vibration resistance at a
moderate cost in the Series DP Double Bellows Differential Pressure Switch. Both
set and reset points are easily adjustable through non-interactive, externally accessible
controls. Visible set point indicators simplify changes. SPDT snap action switch, 316
stainless steel or brass bellows, anged steel housing. Rated pressures to 600 psig.
FEATURES/BENEFITS
• Bellows switch design provides sensitivity to pressure changes but resists vibration
preventing out of range switching
• External access to set and rest controls makes for easy adjustments
• Visible set point indicators simplify changes
APPLICATIONS
• Accurate switch triggers in high pressure applications
Ø13/64 [5.16] MOUNTING HOLES
EQUALLY SPACED ON A 6-1/2 [165.10] B.C.
1/8 FEMALE
NPT LOW
PRESSURE
CONNECTIO
N
OPERATING
ADJUSTMENT
OR RESET
45°
Ø7/8 [22.23]
CONDUIT CONNECTION
Ø6
[152.40]
1/8 FEMALE
NPT HIGH
PRESSURE
CONNECTION
3/4 [19.05] CLEARANCE
FOR COVER REMOVAL
4-1/4
[107.95]
2-3/4
[69.85]
1-7/32
[30.94]
Ø7
[177.80]
SPECIFICATIONS
Wetted Materials: Brass on ranges 61,
62, 63 or 316 SS on ranges 62E, 64E,
65E.
Temperature Limits: -10 to 180°F (-23
to 82°C).
Pressure Limit: Maximum pressure of
the operating range.
Enclosure Rating: General purpose.
Weatherproof or explosion-proof
optional.
Switch Type: Snap switch. (Contact
factory for mercury switch).
Electrical Rating: See model chart.
Electrical Connection: Screw terminal.
Conduit Connection: General purpose:
1/2˝ hole for conduit hub; Weatherproof:
1/2˝ conduit hub; Explosion-proof: 3/4˝
female NPT.
Process Connection: General purpose
and weatherproof: 1/8˝ female NPT,
explosion-proof: 1/4˝ male NPT.
Mounting Orientation: Vertical.
Set Point Adjustment: Thumbscrew.
Weight: General purpose: 5 lb (2.3 kg),
weatherproof: 7 lb (3 kg), explosion-
proof: 25 lb (11 kg).
Deadband: See model chart.
Agency Approvals: CE, cULus.
SERIES DP | MERCOID
®
BY DWYER
SERIES DX
V
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USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
SPECIFICATIONS
Service: Compatible gases and liquids.
Wetted Materials: Connection: Brass;
Diaphragm: Fluoroelastomer.
Temperature Limits: 30 to 140°F (-1 to
60°C).
Pressure Limits: 200 psig (13.8 bar).
Continuous single side only pressure
should not exceed 1.25 x full differential
range.
Enclosure Rating: Weatherproof UL
type 4X (IP65).
Repeatability: ±2% of full range.
Switch Type: SPDT snap switch.
Electrical Rating: 5 A @ 125/250 VAC
(~), 5 A res. @ 30 VDC (
).
Electrical Connection: Removable
terminal block.
Conduit Connection: 0.871˝ diameter
hole for 1/2˝ conduit tting.
Process Connection: 1/4˝ NPT female.
Mounting Orientation: Ports on
horizontal plane, ±10°.
Set Point Adjustment: External screw.
Housing Materials: Body: Aluminum;
Housing: Polycarbonate; Cover: 300 SS.
Vibration and Shock: Set point repeats
after 2.5 Gs, 5 to 500 Hz. Set point
repeats after a 15 Gs, 10 millisecond
duration.
Humidity Limit: 80% (non-condensing).
Pollution Degree: 2.
Environment: Intended for indoor and
outdoor use.
Weight: 1 lb 3 oz (0.54 kg).
Agency Approvals: CE, cULus.
• Proving ow through a chiller
• Proving ow through a heat pump or AC unit
OPTIONS
To order add sufx: Description
-PRESET Preset unit
Example: DXW-11-153-1-PRESET
MODEL CHART
Model
Adjustable Differential
Range (on increase)
[psid (bar)]
Fixed Deadband [psid (bar)]
Low
Set Point
High
Set Point
DXW-11-153-1
DXW-11-153-2
DXW-11-153-3
DXW-11-153-4
2.5 to 10 (0.17 to 0.69)
10 to 25 (0.69 to 1.72)
25 to 50 (1.72 to 3.45)
50 to 75 (3.46 to 5.17)
1.5 (0.10)
2.5 (0.17)
3.5 (0.24)
6.0 (0.41)
2.5 (0.17)
3.5 (0.24)
6.0 (0.41)
8.0 (0.55)
Note: Set points on decrease will be the range minus the deadband.
MODEL CHART
Bellows
Material
Range,
psid (bar)
Max. Press,
psig (bar)
Adjustable Deadband Fixed Deadband
Snap Action Switch
SPDT, 15A @ 120/240 VAC
Snap Action Switch
SPDT, 15A @ 120/240 VAC
Min. D.B.
psid (bar) Model
Fixed D.B.
psid (bar) Model
Brass
Brass
Brass
316 SS
316 SS
316 SS
0-10 (0-0.7)
0-20 (0-1.4)
0-30 (0-2.1)
0-20 (0-1.4)
0-30 (0-2.1)
0-80 (0-5.5)
50 (3.5)
100 (6.9)
300 (20.7)
100 (6.9)
300 (20.7)
600 (41.4)
1.5 (.10)
2.5 (.17)
6.0 (.41)
3.0 (.21)
6.0 (.41)
20(1.4)
DPA-7033-153-61
DPA-7033-153-62
DPA-7033-153-64
DPA-7043-153-62E
DPA-7043-153-64E
DPA-7043-153-65E
0.5 (.03)
1.0 (.07)
1.5 (.10)
1.5 (.10)
2.0 (.14)
6.0 (.41)
DPS-7233-153-61
DPS-7233-153-62
DPS-7233-153-64
DPS-7243-153-62E
DPS-7243-153-64E
DPS-7243-153-65E
OPTIONS
To order
add sufx: Description
W Weatherproof enclosure
Example: DPAW-7033-153-61
E Explosion-proof enclosure
Example: DPAE-7033-153-61
YEAR LIMITED
WARRANTY
Pressure_2021.indb 57 7/15/20 8:18 AM