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Flow Switches Series SFP

Flow Switches Series SFP
Flow Switches Series SFP
Product Code : 87
Product Description

Flow Switches Series SFP

MAIN CHARACTERISTICS : SFP flowswitch closes or switches an electric contact when the flow of water passing through it reaches its upper set-point (intervention) and opens or releases the contact when it drops below the lower set-point (release). A pair of permanent magnets, placed in their mutual repulsion position, one inside the flow switch body and one outside the body, replace the classic solution with O-ring seal and shaft. This new solution greatly increases the reliability and working life of the flowswitch.
OPERATING PRINCIPLE SFP floswitches are installed in series with the circuit to be monitored (Fig.4). The flow of water in the circuit passes through a calibrated passage (Fig.1). The pressure difference that is generated lifts the diaphragm-cap-magnet unit and overcomes the antagonist force exercised by the spring. When this magnet is at a specific distance from a second magnet located inside the microswitch drive piston, then their mutual repulsion force becomes greater than the tripping force of the microswitch push- button and switching takes place. If the flow rate continues to increase this opens an additional passage that attenuates the increase in load losses and prevents generation of bothersome noise (fig.2). On the other hand when the flow rate decreases and goes below the return valve the two magnets move apart and the microswitch push-button returns to its normal position. On request the flowswitch can have a seat for installing a flow regulator.
ELECTRICAL CHARACTERISTICS All versions are available with one or two micro switches. MICRO SWITCH: SPDT with UL, CSA, SFV, VDE, SEMKO and BEAB approvals. Fast-on 6, 3 mm connections; 10 (3) A 250 Vac. MICRO SWITCH BOX AND CABLE: IP 40 and IP54 (max. 2 micro) European Standard Reference CEl EN 60529. The IP40 version with one micro switch is supplied with a standard 650mm two-pole cable (single-pole micro: C-NO contact), the two micro switch version is supplied without cable. The version in IP54 is supplied only with cable as it is not possible to access the switch internally.
FUNCTIONAL CHARACTERISTICS
  • Maximum static pressure: 10 bar
  • Maximum fluid temperature: 95°C
  • Minimum fluid temperature: 5°C
  • Maximum room temperature: 80°C
MATERIALS
  • Body: Brass
  • Cap: Noryl
  • Microswitch box Glass reinforced nylon
  • Cover: Brass
  • Springs: Stainless steel
  • Cable: H05 VVF

 


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