Flow Switch

Flow Switch


Sigma Flow Switch is an extension of the level switches. There are two types of flow switches : one for low flow / line size up to 50 mm line size (Model FS 1000) and another from 25 mm onwards up to 800 mm or above (Model FS 1010).Model FS 1000 is a valve type Flow Switch wherein an increase in flow through the body raises the valve disc depending upon the flow. This in turn raises the magnetic sleeve moving inside a non-magnetic enclosure. The movement of the sleeve attracts the magnet located outside the tube which in turn actuates a micro switch. Decrease in flow reverses the action. Model FS 1010 is a target type which moves from a vertical position to a near horizontal position as the flow increases. This change in position moves a magnetic sleeve in a non-magnetic enclosure. The movement of the magnetic sleeve attracts a magnet which in turn actuates a micro switch. Decrease in flow brings the target back to the vertical position.

The Flow Switches are Used,

  • To Sense the Start or Stop of Non-Viscuos Liquid Flow Like Water, Gas, Chemicals or Any other Flowing Medium
  • In Interlock Systems For Ensuring Minimum Flow Through Pipe Lines Before Starting Equipments
  • In Cooling Water These Flow Switches Are Used to Shut Down the Pumps, Blowers, Fans Should the Flow Decreases Below a Predetermined Limit

  Model No.FS1000 Model No.FS1010
Type Disc Type Target Type
Size 15 to 50 mm 25 mm to 800 mm or above
Body CS, Brass, Bronze, SS304/SS316/specified C.S / SS 304 / SS 316 / specified
Trim SS 304 / SS 316 / specified SS 304 / SS 316 / specified
Connection Size Screwed or Flanged in required size

1 - 2 1/2" screwed NPT / BSP or flanged to required standard / size

Range Adjustment By adjusting the screw on top of switch By adjusting the screw on top of switch
Switch Enclosure Weather proof IP 67 / Explosion proof IIC Weather proof IP 67 / Explosion proof IIC
Switch Type Micro Micro
Contacts SPDT 10 A / 15 A @ 250 V AC SPDT 10 A / 15 A @ 250 V AC
Conduit upto 3/4" NPT / 1" BS upto 3/4" NPT / 1" BS

Max operating Pressure

10 - 50 kg/cm2/ specified 10 - 50 kg/cm2/ specified

Max operating Temperature

150oC / specified 150oC / specified

  • Flow Switches are Available From 15 mm to 800 mm or More
  • Flow Actuation Point Field Adjustable When Switch is in Operation
  • Flanged or Screwed Connection
  • By Trimming the Vane Length, the Same Flow Switch Can be Used For Smaller Line Size in Model FS 1010
  • Magnetic Coupling Eliminates Diaphragm or Bellows of Conventional Switches
  • Sight Windows Can be Provided For Model FS 1010 to Have Visual Observation of the Flow

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