What does an air flow switch do?
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.
Is a flow switch normally open or closed?
Flow switch is used to activate a device when flow starts. When flow starts and the increasing operating flow is reached or exceeded, the common (black wire) and normally open (red wire) contacts are closed, while the common (black wire) and the normally closed (blue wire) are open.
When would you use a flow switch?
Flow switches might be used to monitor the flow rate of a liquid, trigger an alarm if the flow is too high or too low or even protect a pump. The flow sensor will usually send an electrical signal to a PLC or other electronic controller.
Is a flow switch a sensor?
A flow switch, sometimes referred to as a flow sensor or flow indicator, is a device used to monitor the flow rate and pressure of liquids, air or other gaseous media through a duct, system or loop.
What can an air flow switch be used for?
Air Flow Switch is designed to monitor air flow in ducts. Includes a mounting bracket for quick duct mounting. Applications include fan monitoring, filter monitoring, and air handlers.
What are the uses of Dwyer flow switches?
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. Shuttle / Piston. Shuttle or piston flow switches are sensors with an electrical contact output at a specific flow rate.
Which is a direct indicator of air flow?
The static pressure is a direct indicator of the airflow rate; a complex device, e.g. a pressure switch to activate an alert if the flow drops below pre-set trigger levels” Page 70 : 256 – Table 15: “Provide airflow indicators, e.g. manometers, at hood ducts and at other necessary points”
What are the different types of flow switches?
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.