Dwyer 1640-0 Floating Contact Null Switch

Product Description

The Dwyer 1640-0 Floating Contact Null Switch is engineered for precise control of air pressure in HVAC systems. This switch utilizes a unique floating contact mechanism to ensure reliability and accuracy in monitoring pressure changes within ducts.

• Efficient SPDT switch accommodates a variety of system demands.
• Visible set point adjustment for easy calibration.
• Large diaphragm ensures low-range accuracy.

Product Highlights

Optimal for use in applications such as damper positioning and duct air control. The switch features a pressure range from 0.01 inches to 0.2 inches of water column, making it ideal for both high-sensitivity and rugged environment operations.

Product Information

Standard Information

• Service: Air and non-combustible, compatible gases.
• Temperature Limits: Minus 30 to 110 degrees Fahrenheit.

Technical Specifications

• Wetted Materials: Consult factory.
• Pressure Limits: Continuous 10 psig, surge 25 psig.
• Switch Type: Single Pole Double Throw (SPDT).
• Electrical Rating: Various ratings based on application. De-rate 70-80% for slow pressure changes.
• Process Connections: One-eighth inch female NPT.
• Mounting Orientation: Diaphragm in vertical position.
• Set Point Adjustment: Screw type.
• Weight: Four pounds thirteen ounces.
• Agency Approvals: CE marked.