Sail Switch Senses Air Flow
Commonly the JMP sail switch is used in HVAC systems to sense air flow. When air flow is lost in the duct system, the sail switch will kick on a booster fan. The sail is attached to a 3 inch leaf, and as air is passing by the switch, the leaf actuates the micro switch plunger signaling air flow is present.
JMP Sail Switch Product Details
Because of the simplicity of the JMP sail switch, it’s a great solution for this application. If a small amount of air flow is passing through the system, by increasing the sail size and leaf length, the sail switch can capture this. Also, the sail switch can be mounted anywhere in the duct system. As air travels through a system it loses the amount of force. Therefore changing the location of the switch – closer or farther away from the air source – will change the sail size or leaf length.
Order a Sail Switch Today!
So, the question is what sail size or leaf length should be in the duct system? Senasys recommends trying our standard sail switch available for purchase online. Place the sail switch in the duct system, and if the sail switch senses the air flow, great. If not, try moving the switch closer to the air source. If the sail switch still isn’t sensing the small amount of air flow, spot weld a larger sail or increase the leaf length. Senasys can build a custom switch to meet the application requirements. Send us the sail switch details that fit into the application.
For more information about the sail switch in duct systems, visit the product page.