Siemens QVE1901U : Liquid Flow Switch, SPDT , 3/4" to 8" Inch Pipe Diameter, 365 PSIG MWP, 5-Year Warranty

Siemens QVE1901U : Liquid Flow Switch, SPDT , 3/4" to 8" Inch Pipe Diameter, 365 PSIG MWP, 5-Year Warranty

The QVE1901U Flow Switch is used in HVAC installations to monitor the flow of fluids in hydraulic systems, especially in refrigeration, heat pump and heating installations (for example: for use with condensers, boilers, heat exchangers, and so on).

The device records the flow of monitored medium via a paddle system (1), which has a permanent magnet (2) attached at its upper end. A reed contact (3) is positioned outside the flow above this magnet. A second magnet (4) with opposite polarity is used to create a reset force. The paddle system moves once it comes into contact with the monitored flow. The magnet (2) changes its position to the reed contact (3). The contact opens/closes depending on the contact type. As soon as the flow is interrupted, the paddle returns to its original position and the reed contact opens/closes depending on the contact type.

Specifications

Data Sheets

Siemens QVE1901U Flow Switch Technical Instructions