Air Flow Switch Operation

Flow switches are used in spas and hot tubs to tell the system to turn on and off.

Air flow switch operation.

Air flow exerts a force on a paddle actuating a dust tight spdt micro switch. Duct pressure switches automatically start and stop auxiliary devices like electronic air cleaners duct heaters humidifiers exhaust fans and duct booster fans. The switching point may be adjusted continuously within a wide range making the lps useful in a wide variety of applications. The flow switch is factory set to switch at 195 fpm.

This switch can be used to actuate audible or visual alarms as well as relays or other controls. If you receive an error code when you try to turn the hot tub or spa on troubleshooting the flow switch can help indicate where a problem exists. Often used to detect clogged air filters and iced air conditioner coils these switches sense small changes in pressure between two points in your duct. A damaged or defective flow switch will keep the spa from receiving electricity.

Flow switches are mechanical devices used in controlling the flow of air steam or liquid. To handle air velocities greater than 920 fpm the paddle may be cut at a precalibrated mark. In the presence of fluid flow controlled movement of the piston actuates an external hermetically sealed reed switch. Draft inducer and pressure switch operation the draft inducer motor is a blower that creates a flow of combustion air through the furnace s heat exchanger s to make sure all combustion exhaust byproducts are vented outside the home via the flue vent.

When the pressures from two different sources in a process are connected across the sensing diaphragm metallic or elastomeric as the case may be the pressure difference creates a force which then overcomes that of a pre tensioned spring and in the process moves a balancing arm or mechanism to effect the minimal movement required to actuate the micro switch es of the switch. Most air purge systems consist of a fan with a motor some type of filter housing and a filter cartridge all stored in a weatherproof environment. Flow switch operating principle is based on a free floating magnetic piston which responds only to the motion of fluids within the line not to static or system pressures. Rely on grainger for a wide range of duct pressure switch options.

It is necessary to provide damage protection and circuit cooling or adjust flow rates that are too high or too low. An air switch senses positive negative or differential air pressure and actuates an internal switch. The trip signal will indicate to the pump to turn on or turn off. Sometimes pressure switches are employed to designate deficient pressure to ensure that the required flow is maintained.

Learn more about the technology and operating principles behind gems sensors and controls broad portfolio of sensing products by accessing our operating principles for level pressure flow conductivity relays and barriers and ultrasonic products.