Siemens QVE1900U : Liquid Flow Switch, SPDT, 1-1/4" to 8" Inch Pipe Diameter, 160 PSIG MWP, 5-Year Warranty

Siemens QVE1900U : Liquid Flow Switch, SPDT, 1-1/4" to 8" Inch Pipe Diameter, 160 PSIG MWP, 5-Year Warranty

The QVE1900U Flow Switch is used in HVAC installations to monitor the flow of fluids in hydronic heating and cooling systems. When there is no flow, or when the flow rate is insufficient to activate the switch, the circuit between the red and blue terminals is closed, and the circuit between the red and white terminals is open. When the flow rate increases to a level sufficient to activate the switch mechanism, the circuit between the red and blue terminals will open, and the circuit between the red and white terminals will close.

The switch activation points can be adjusted via the + / - screw inside the enclosure. The unit consists of a base, paddle, and body with a 1" MNPT system connection. The base houses the microswitch, electrical terminals, and adjusting screw (for switch- on/switch-off point), a paddle holder, and an opening for the cable entry. Four paddles are included that can be trimmed to accommodate different pipe diameters. The cover is secured to the base with two screws.

Specifications

Data Sheets

Siemens QVE1900U Flow Switch Technical Instructions