Flow Switches

Flow Switch Sensors with an electrical contact output at a specific flow rate have different types of switches, which are paddle, thermal, piezo, and shuttle/piston.

Paddle Paddle flow switches or vane sensors with an electrical contact output are at a specific flow rate. Dwyer flow switches are economical and reliable. Applications include proof of boiler flow, air conditioning, controlling of dampers according to flow, and protecting pumps, motors and other equipment against low or no flow. View More

Shuttle/Piston Shuttle or piston flow switches are sensors with an electrical contact output at a specific flow rate. Models are used with oil, air, water and gases. Applications include oil flow control, low flow detection in cooling lines, and high pressure lubrication systems. Rugged construction and excellent chemical compatibility simplify flow/no flow detection. View More

Thermal Thermal flow switches are sensors with an electrical contact output at a specific flow rate. Dwyer models provide a complete system for leak detection and feature a selectable NO or NC operation. Applications include chillers, hot water heaters, and liquid transfer systems. View More

Piezo Piezo flow switches are sensors with an electrical contact output. The bulk flow monitor provides effective monitoring for most flow/no flow conditions in pipes. Applications include oil spray systems, rotary drums, distributors, and food processing. Dwyer's piezo flow switch offers many features that exceed the industry standards. View More

Questions

Question

What precautions should be taken when making an outdoor installation?

Answer

Keep the junction box above the nearest low point in the conduit run and make sure the conduit connection is sealed to prevent condensation from running into the switch.

Related

Series V6

Question

Why is the method of mounting a V4 of concern?

Answer

The vane and magnet keeper assembly near the hinge pin are very close to the mounting threads. Combined with the fact that pipe fittings are available in many variations, this produces a possibility that the customer will mount the switch in a fitting that prevents the vane from swinging. To make things worse, there is usually no way the customer can tell that this has happened. Mounting in a threaded branch connection avoids this clearance problem.

Related

Series V4

Question

How is "deadband" defined as related to the V4 switch?

Answer

Deadband is the difference between the switch actuation flow and switch deactuation flow; in general, V4 flow switches have a 45% deadband meaning deactuation occurs at approximately 55% of actuation flow.

Related

Series V4

Question

Can a V4 switch be installed in a vertical run of pipe?

Answer

Yes, but not the standard model. Vertical pipe installations must be specified on the order and require a special spring loaded vane. Only for use in vertical up-flow applications. Please see option -V in online configurator.

Related

Series V4

Question

What precautions should be taken when installing a V4 switch in an extremely high flow application?

Answer

Installation with a 2 1/2" threaded branch connection is recommended to allow the vane to swing out almost parallel to the flow to reduce stress on the vane and pressure drop in the system.

Related

Series V4

Flow Switches

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