It is necessary to provide damage protection and circuit cooling or adjust flow rates that are too high or too low.
Air flow switch operation.
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Aflow switchoperates by conveying a trip motion relay reed switch paddle to another machine within the system usually a pump.
A damaged or defective flow switch will keep the spa from receiving electricity.
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.
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.
To handle air velocities greater than 920 fpm the paddle may be cut at a precalibrated mark.
This switch can be used to actuate audible or visual alarms as well as relays or other controls.
Airflow actuated hvac switches use this switch to sense changes in airflow velocity.
The trip signal will indicate to the pump to turn on or turn off.
The switching point may be adjusted continuously within a wide range making the lps useful in a wide variety of applications.
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.
The flow switch is factory set to switch at 195 fpm.
An air switch senses positive negative or differential air pressure and actuates an internal switch.
Flow switches are mechanical devices used in controlling the flow of air steam or liquid.
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.
Air flow exerts a force on a paddle actuating a dust tight spdt micro switch.
The principle of operation is quite simple.
Duct pressure switches automatically start and stop auxiliary devices like electronic air cleaners duct heaters humidifiers exhaust fans and duct booster fans.
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.
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.
Flow switches are used in spas and hot tubs to tell the system to turn on and off.
