Manual

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.
Series DX Differential Pressure Switch
Specifications - Installation and Operating Instructions
Bulletin IN-DX
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]
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 fitting.
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.
Altitude Limit: 6560 ft (2000 m).
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.
Example
Series
Construction
Wetted Materials
Process Connection
Circuit Options
Range
Options
DX
DX
W
W
1
1
1
1
153
153
2
1
2
3
4
M
SST
PRESET
DXW-11-153-2-M
Differential Pressure
Switch
Weatherproof
Brass/Fluoroelastomer
1/4˝ NPT
SPDT
2.5 to 10 psi
10 to 25 psi
25 to 50 psi
50 to 75 psi
Stainless Steel tag
Preset set point
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)
At High Set Point
2.5 (0.17)
3.5 (0.24)
6.0 (0.41)
8.0 (0.55)
Approximate Deadbands
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]
Fixed Deadband
psid (bar)
At Low Set Point
1.5 (0.10)
2.5 (0.17)
3.5 (0.24)
6.0 (0.41)
IN-DX:SSS-1000 10/1/10 10:16 AM Page 1