Pressure Switches

When a specific pressure of a gas/liquid is sensed pressure switches work to open/close a circuit.


Dwyer 1900 Series Compact Low Differential Pressure Switches

Dwyer 1900 Series Compact Low Differential Pressure Switches

For air and non-combustible compatible gases, Series 1900 switches have set points from 0.07 to 20" w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw located inside conduit enclosure and prevents tampering. UL, CE and CSA listed, and FM approved.


Dwyer 1630 Series Large Diaphragm Pressure Switches

Dwyer 1630 Series Large Diaphragm Pressure Switches

This high precision large diaphragm pressure switch incorporates a visible set point indicator for maximum convenience. UL and CSA listed, FM approved for general service, these switches are suitable for most applications in air conditioning and industrial service. Electrical capability of 15 amps handles most small electrical loads.


Dwyer 1800 Series Low Differential Pressure Switches for General Industrial Service

Dwyer 1800 Series Low Differential Pressure Switches for General Industrial Service

Combines small size and low price with 2% repeatability for enough accuracy for all but the most demanding applications. Set point adjustment inside the mounting stud permits mounting switch on one side of a wall or panel with adjustment easily accessible on the opposite side. UL and CSA listed, and FM approved.


Dwyer 1950 Series Explosion-proof Differential Pressure Switches

Dwyer 1950 Series Explosion-proof Differential Pressure Switches

CE, UL and CSA listed, FM approved for use in Class I, Div 1, Groups C and D, Class II Groups E, F, and G and Class III hazardous atmospheres NEMA 7 & 9. Raintight NEMA 3 (IP54). Weatherproof features include a drain plug and O-ring seal in cover. Series offers set points from .03 to 20" w.c. (7.5 to 5 kPa) and from .5 to 60 psi (0.035 to 3.5 bar).


Dwyer A3000 Series Photohelic Pressure Switch/Gauges

Dwyer A3000 Series Photohelic Pressure Switch/Gauges

The direct reading scales eliminate troublesome conversions. The scales are brushed aluminum, coated with epoxy and the graduations are on both sides of the indicating tube. Special integral flow guides stabilize the float throughout the range to keep it from hunting or wandering in the bore. The float is highly visible against a white background.


Dwyer 1000E Series Explosion-Proof Diaphragm Operated Pressure Switches

Dwyer 1000E Series Explosion-Proof Diaphragm Operated Pressure Switches

Same rugged construction as used in Series 1000W plus explosion-proof design are combined in this unit. UL listed for Class I, Groups A, B, C and D; Class II, Groups E, F and G. Bellville spring movement permits mounting of control in any position and helps prevent contact chatter. Features Visible Setpoint, Fixed Deadband, and Ranges to 1400psi.


Dwyer 1000W Series Weatherproof Diaphragm Operated Pressure Switches

Dwyer 1000W Series Weatherproof Diaphragm Operated Pressure Switches

Extremely rugged construction provides excellent reliability in chemical, petroleum and industrial plants and provides high overpressure protection. Bellville spring movement permits mounting of control in any position and helps prevent contact chatter. Features Weatherproof Housing, Visible Setpoint, Fixed Deadband, and Ranges to 1400 psi.


Dwyer 1620 Series Single and Dual Pressure Switches

Dwyer 1620 Series Single and Dual Pressure Switches

Model 1626 and 1627 differential pressure switches are identical in design and construction except that Model 1626 has a single electric switch and Model 1627 has dual electric switches, which can be set to open or close two independent electrical circuits.


Dwyer 1640 Series Floating Contact Null Switches for High and Low Actuation

Dwyer 1640 Series Floating Contact Null Switches for High and Low Actuation

The 1640 is equipped with a single pole, double throw floating contact switch (not snap acting) so it functions as a null switch. As the diaphragm moves in response to pressure changes, it moves the floating contact to cause switching action at two preset points with no switching action between these points.


Dwyer 1950G Series Explosion-proof Differential Pressure Switches

Dwyer 1950G Series Explosion-proof Differential Pressure Switches

UL listed for use in Class I, Groups A, B, C, & D; Class II, Groups E, F, & G and Class III atmospheres, Directive 94/9/EC (ATEX) Compliant for CE ATEX II 2G Exd IIB+H2 T6, CSA & FM approved for Class I, Div. 1, Groups B, C, D; Class II, Div. 1, Groups E, F, G and Class III atmospheres IECEx Ex d IIB+H2 T6 (-40°C < Ta < 60°C).


Dwyer 3000MR/3000MRS Series Photohelic Switch/Gauges

Dwyer 3000MR/3000MRS Series Photohelic Switch/Gauges

Switch setting is easy to adjust with large external knobs on the gauge face. Gauge reading is unaffected by switch operation - will indicate accurately even if power is interrupted. Solid state design now results in greatly reduced size and weight. Units can be flush mounted in 4-13/16" (122 mm) hole or surface mounted with hardware supplied.


Dwyer ADPS Series Differential Pressure Switches

Dwyer ADPS Series Differential Pressure Switches

Designed for pressure, vacuum, and differential pressures. The dual scaled adjustment knob in inches water column and pascals allows changes to the switching pressure to be made without a pressure gauge. The ADPS/EDPS is available with settings from 0.08 in w.c. (20 Pa) up to 20 in w.c. (5000 Pa).


Dwyer DA/DS Series Bourdon Tube Pressure Switches

Dwyer DA/DS Series Bourdon Tube Pressure Switches

The Mercoid D Series is one of the world's broadest lines of pressure switches. Whatever your application might be, it is most probable it can be fully satisfied with a D Series pressure switch.


Dwyer DA/DS Series Bourdon Tube Pressure Switches with Weather-Proof Housing

Dwyer DA/DS Series Bourdon Tube Pressure Switches with Weather-Proof Housing

The Mercoid D Series is one of the world's broadest lines of pressure switches. Whatever your application might be, it is most probable it can be fully satisfied with a D Series pressure switch.


Dwyer A1F Series Low Cost OEM Pressure Switches

Dwyer A1F Series Low Cost OEM Pressure Switches

Wetted materials of 316 SS and fluorocarbon ensure great chemical compatibility with a wide range of process media. The open case style is perfect for panel mounting applications like pump skids. Field installable weatherproof enclosure is available in polycarbonate offering a low cost weatherproof switch.


Dwyer A9 Series Snap-Action Pressure Switches

Dwyer A9 Series Snap-Action Pressure Switches

Designed for controlling pressure with higher current capacity. These switches are used widely in steam cleaners, steam irons, and other pressure control systems. It provides SPDT contact and Series A9 Pressure Switches utilize high-quality miniature snap-action switches.


Dwyer AP Series Diaphragm Operated Pressure Switches

Dwyer AP Series Diaphragm Operated Pressure Switches

Compact instrument for air or other low pressure applications. Visible set point and external adjustment add convenience. Used on air, non-corrosive gas or liquid service compatible with wetted parts. Unit also available in weatherproof and explosion-proof housing.


Dwyer CS & CD Series Diaphragm Pressure Switches

Dwyer CS & CD Series Diaphragm Pressure Switches

Series CS and CD combine advanced design and precision construction in a small size. Unit is ideal for instrument panels, small compressors and general industrial applications. Visible set point and easy to wire SPDT snap switch reduce installation time. Operates in any position and is vibration resistant.


Dwyer DA/DS Series Bourdon Tube Pressure Switches with Explosion-Proof Housing

Dwyer DA/DS Series Bourdon Tube Pressure Switches with Explosion-Proof Housing

The Mercoid D Series is one of the world's broadest lines of pressure switches. Whatever your application might be, it is most probable it can be fully satisfied with a D Series pressure switch.


Dwyer A6 Series Pressure Switches

Dwyer A6 Series Pressure Switches

Simple, setpoint field adjustment. Excellent setpoint integrity.