The FL-SF1K paddle switch is intended to monitor liquid flow within pipes and provide a switched output upon detection of either a specific flow rate or flow failure. The unit screws directly into a 1″ BSPT boss and has adjustable paddle lengths.
Function
Flow control of water and aggressive media (depending on model). Alarm signal of flow shortage. Available in brass, suitable for normal media.
Installation
The flowswitch can be installed in any position, as far as possible from elbows or throttling, with the arrow indicating the flow direction. If the pipe is vertical, recalibrate the range to balance paddle weight. If the device is downward-mounted, take care of sludge, and apply it in a straight pipe, far from filters, valves, etc., with a length of at least 5 times the diameter of the pipe upstream and downstream of the unit.
• heating and air conditioning systems
• refrigeration systems
• heat pumps
Specification
Contacts: Dust-tight microswitch with switching contacts SPDT
Switch Capacity: 15(8)A, 24…250Vac
Working: -40…+85˚C 10…90% RH (without condensing)
Max. Liquid Temp.: -40…+120˚C
Max. Pressure: 11 bar (SF2: 30 bar)
Connection: Standard R1″ (DIN 2999) for series SF1 and SF2
Paddles: Stainless steel AISI 316L
Housing: Base in ABS, transparent PC cover
Storage: -40…+85˚C < 95% RH
Protection: IP65, class I
Size: 140 x 62 x 65mm
Connect to the red (Normally Open) and white (Common) contacts of the microswitch. The red-white contact opens when the flow drops below the set level. When the flow is missing, the red-blue (Normally Closed) contact closes and can be used as a signal to start or alarm contact.
















