Series DX Differential Pressure Switch
®
Specications - Installation and Operating Instructions
Bulletin IN-DX
The SERIES DX is a pressure switch that makes a contact output based on the
differential pressure between two pressure sources. Unit incorporates a SPDT snap
switch in a weatherproof, type 4X enclosure. Series DX features low differential
pressure set points with high single pressure limit.
OPERATING PRINCIPLE
The DX uses opposing diaphragms to sense the high and low pressure. A pivot
mechanism transfers the difference of the two pressures to the switch.
Example DX W 1 1 153 2 DXW-11-153-2-M
Series DX Differential Pressure
Construction W Weatherproof
Wetted Materials 1 Brass/Fluoroelastomer
Process Connection 1 1/4˝ NPT
Circuit Options 153 SPDT
Range 1
2
3
4
Options SST
PRESET
Switch
2.5 to 10 psi
10 to 25 psi
25 to 50 psi
50 to 75 psi
Stainless Steel tag
Preset set point
1-27/64
[36.30]
35/64
[13.97]
2-55/64
[72.59]
1-13/32
[35.56]
2-1/2
[63.50]
15/64
[6.00]
1-11/32
[34.04]
9/16
[14.10]
1-13/64
[45.85]
59/64
[23.50]
4-29/64
[113.03]
47/64
13/64
[5.08]
1-13/16
[46.05]
3/4
[19.05]
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).
Enclosure Rating: Weatherproof UL type 4X (IP65).
Repeatability: ±2% of full range.
Switch Type: SPDT snap switch.
Electrical Rating: 5A @ 125/250 VAC (~), 5A 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. Continuous single side only pressure
should not exceed 1.25 x full differential range.
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, UL.
[18.80]
2X
47/64
[18.54]
Fixed Deadband
Adjustable Range
psid (bar)
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)
psid (bar)
At Low Set Point At High Set Point
1.5 (0.10)
2.5 (0.17)
3.5 (0.24)
6.0 (0.41)
Approximate Deadbands
2.5 (0.17)
3.5 (0.24)
6.0 (0.41)
8.0 (0.55)
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UNPACKING
Remove the DX from the shipping carton and inspect for damage. If damage is found,
notify the carrier immediately.
NC
NO COM
INSTALLATION
Insure that the process uid is compatible with the wetted
CAUTION
Do not exceed the maximum device ratings.
CAUTION
Insure that the system is not pressurized before installing or
CAUTION
The DX is to be mounted with the pressure connections horizontal ±10°.
For pipe mounting, mount the unit from the pressure connections to the pipe. Make
sure the piping is properly supported to handle the weight of the pressure switch.
For surface mounting, mount the unit to the selected surface using the mounting ear
holes provided using two #6 or #8 screws. See the Figure 2 for mounting hole spacing.
Make sure that connections are connected to the proper port. The high pressure port is
marked with the “+” sign and is on the left side of the unit with the label side facing you.
The low pressure port is marked by the “-“ sign and is the right side of the unit. Piping
or tubing should always be turned into the pressure port, do not turn the pressure
switch. When installing the piping or tubing into the switch always use a wrench on the
ats of the pressure connection. Use pipe thread sealant tape or other suitable pipe
joint compound when making the pressure connection.
ELECTRICAL CONNECTION
A SPDT snap action switch is provided. The output logic is shown in Table 1.
Condition NO NC
Differential Pressure Above Set Point Closed Open
Differential Pressure Below Set Point Open Closed
materials.
removing this device or other objects from the system.
1-11/32
[34.04]
9/16
[14.10]
35/64
2X
[13.97]
47/64
[18.54]
Figure 2: Mounting Hole Dimensions
Table 1: Switch Action
1-13/32
[35.56]
2-1/2
[63.50]
15/64
[6.00]
VIEW OF TERMINAL BLOCK
INSIDE SWITCH HOUSING
Figure 2: Wiring Diagram
WARNING
NOTICE
Electrical connections are made to the removable terminal block inside the enclosure.
Remove the terminal block from the circuit board for wiring if desired. Feed stripped
and tinned leads through the conduit opening and connect them as shown in Figure 2.
250V @ 60C 14 to 24 AWG / 2.5 to .25 mm2 wiring with PVC or equivalent insulation
with 94-V0 or FV-0 ammability rating is recommended for the switch. Replace
terminal block after wiring. The DX provides one 0.871˝ diameter hole for 1/2˝ conduit
tting. The conduit connections must be made such that condensation is not allowed
to enter the sensor housing. If necessary install a conduit breather drain in a separate
conduit body to prevent buildup of moisture.
NOTICE
SETPOINT ADJUSTMENT
The set point is adjusted with a standard slotted head screw driver.
1) Remove rubber plug over set point adjustment screw located on the right side of
the unit (with the label side facing you).
2) Insert the screw driver to turn the set point adjustment.
3) A clockwise rotation is an increase in differential pressure set point and a
counterclockwise rotation is a decrease in differential pressure set point. (The
set point screw can be turned too far as to fall out; do not turn the screw to the
point that there are no longer any female threads visible in the switch body).
4) Using a pressure source and pressure gauge adjust the set point screw to the
set point desired while monitoring the contact output.
5) Once desired set point is achieved replace set point adjustment cover.
NOTICE
Explanation of Symbols:
Symbol Publication Description
~
Power must be off while wiring connections are being made.
Installation must be made in accordance with local codes and
regulations.
For weatherproof applications, install directly to conduit or use the
optional cable gland accessory.
Design a fail-safe system that takes into consideration the
possibility of switch failure, power failure, and operator error.
IEC 50417 - 5031 Direct current
IEC 50417 - 5032 Alternating current
IEC 50417 - 5019 Protective conductor terminal
MAINTENANCE & REPAIR
Inspect and clean switch with water or damp cloth as needed. Disassembly or
modications made by the user will void the warranty and could impair the continued
safety of the product. If repair is required obtain a Return Goods Authorization (RGA)
number and send the unit, freight prepaid, to the address below. Please include a
detailed description of the problem and conditions under which the problem was
encountered.
Dwyer Instruments, Inc.
Attn: Repair Department
102 Indiana Hwy 212
Michigan City, IN 46360
©Copyright 2017 Dwyer Instruments, Inc. Printed in U.S.A. 3/17 FR# 443822-00 Rev.1
DWYER INSTRUMENTS, INC.
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