What is an airflow proving switch?
The AFS is a general purpose airflow proving switch designed for HVAC and energy management applications. It may be used to sense positive, negative or differential air pressure. An enclosure cover guards against accidental contact with the live switch terminal screws and the set point adjusting screw.
Where do you put a flow switch?
Always install a flow sensor in a straight section of pipe where there is a minimum of 10 diameters upstream (ahead) and a minimum of 5 diameters downstream (behind) of the flow sensor.
What is the common name for an air flow switch?
Since the air flow switch uses sail to sense air flow, it is also called sail switches. Thus, the common name of an air flow switch is sail switch.
How many types of flow switches are there?
There are two main flow switch types — the paddle design and the piston or shuttle design. The paddle design of a flow switch places a hinged or spring-mounted paddle in the liquid flow path. Media flowing at the target rate holds this in position.
How does an airflow switch work?
Flow switches are mechanical devices used in controlling the flow of air, steam, or liquid. A flow switch operates by conveying a trip motion (relay, reed switch, paddle) to another machine within the system, usually a pump. The trip signal will indicate to the pump to turn on or turn off.
What is the purpose of a flow switch?
A flow switch, like all switches, is a device designed to make and break an electric current in a circuit. In an industrial system, a flow switch is essential in monitoring and controlling the flow rate of process media – such as steam, liquids, and gases.
What are typical uses of flow switches quizlet?
Flow switches are used to sound alarms and warning signal lights and to stop or start motors.
What is a Piezoresistor quizlet?
What is a piezoresistor? A resistor that changes its resistance in proportion to the amount of pressure applied to it.
How do I choose a flow switch?
Operating pressure – The operating pressure is the maximum head pressure of the process media that the device can withstand. This factor should be considered when selecting the material of the flow switch. Media temperature range- Media temperature range is the maximum media temperature that can be monitored.