Dwyer Series 1800 Low Differential Pressure Switch

Dwyer Company Headquarters is in Michigan City, Indiana. Dwyer uses advances computer modeling software to simulate real world situations, creating more accurate measurement techniques in our products. Innovative product designs have been recognized by industry experts, including ACHR Dealer Design Awards in the Testing and Monitoring category for 2014 and 2015. Dwyer has invested in state of the art research and development facilities for best in class product testing and verification. Dwyer has a long history of innovation in designing and manufacturing our own measurement sensors that provide superior product performance.

We work tirelessly to get it right. That's why Dwyer holds over 650 technical patents and that number grows every year. We are an enthusiastic group of people headquartered in Michigan City, Indiana with satellite locations around the globe. We take great pride in the intellect and integrity of our employees who are passionate about the work we do, the products we develop and the industries we serve.

Series 1800 Low Differential Pressure Switch

Known for quality, reliability and accuracy, Dwyer designs and manufactures a full-line of Controllers, Data Loggers, Gages, Manometers, Monitors, Remote Displays, Switches, Transmitters, and Accessories to measure, monitor and control pressure, air velocity, flow, fan pressure, duct, and more.

Dwyer’s wide selection extends to Gages, Transmitters, Switches, Data Loggers, and Monitors for Differential Pressure. Dwyer manufactures a range of dial and digital gages to reliably measure and display pressure difference, between two pressure sources using gas or liquid in a process flow.

Sensors for air and non-combustible compatible gases have an electrical contact output at a specific difference between two pressures. Applications vary between the different types of differential pressure switches. A wide variety of switches and circuit styles enables control functions needed for any system.

Essential for industrial environments, the Series 1800 Low Differential Pressure Switch combines small size and low price with 2% repeatability for all but the most demanding applications. Set point adjustment inside the mounting stud permits mounting the switch on one side of a wall or panel with adjustment easily accessible on the opposite side. UL and CSA listed, and FM approved.


  • Compact size and repeatability provide a high-value switch for many industrial applications
  • Designed for panel and wall mounting to easily meet mounting requirements in most industrial settings
  • Pressure ranges from 0.07 in w.c. to 85 in w.c. make this switch suitable for a wide range of applications


  • Process applications
  • Mechanical equipment control


ServiceAir and non-combustible, compatible gases.
Wetted MaterialsConsult Factory.
Temperature Limits-30 to 180°F (-34 to 82.2°C). 1823-00, -20 to 180°F (-28.9 to 82.2°C).
Pressure Limits10 psig (68.95 kPa) continuous, 25 psig (172.4 kPa) surge.
Switch TypeSingle-pole double-throw (SPDT).
Electrical Rating15 A @ 120-480 VAC, 60 Hz. Resistive 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz. De-rate to 10 A for operation at high cycle rates.
Electrical Connections3 screw type, common, normally open and normally closed.
Process Connections1/8" female NPT.
Mounting OrientationDiaphragm in vertical position. Consult factory for other position orientations.
Set Point AdjustmentScrew type inside mounting spud.
Weight1 lb, 5 oz (595 g).
Agency ApprovalsCE, CSA, FM, UL. NOTE: Optional (-EXPL) Explosion-proof Enclosure does not possess any agency approvals.

Download Data Sheet: Series 1800 Low Differential Pressure Switch

Ref: dwyer-inst.com

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