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Water Flow Switches

We recommend installing a visual flow indicator on every water circuit to give the operator confirmation, usually by a simple spinning rotor, that water is flowing. Use flow indicators without switches when an interrupted supply will not cause damage or when the component has its own coolant alarm. For water-cooled components critical to the vacuum (diffusion pump, turbo pump) or those possibly damaged by flow failure (e-beam source, sputter gun) use a water switch with the indicator. The switch should connect to an alarm or process 'kill' button.

In a flow switch, a rotating magnet induces a current in an external coil. The current is sensed and compared to a variable set-point value. If the water flow decreases to a value below the set-point, a relay is de-energized. This arrangement ensures that a stuck rotor carrying the magnet cannot give a false positive flow indication.

Specifications

FFS Water Flow Switches
Max pressure (psi) 100
Pressure drop
Normal models
Low flow models
3" long pipe (same ID)
6 psi drop (1gpm)
Max temperature(°C) 90
Power (VAC, Hz) 115, 50/60
Relay (115VAC or 28VDC) SPDT 3A noninductive
0.5A inductive

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Ordering Table

Description Flow
g.p.m.
Termination Body* Face
Plate
Manual PartNo Price In Stock Add To
Cart
Description Flow
g.p.m.
Termination Body* Face
Plate
Manual PartNo Price In Stock Add To
Cart
Water Flow Switches 0.1-1.0 1/4" Female NPT Brass (polysulphone)
--
FFS-100B P.O.R. Call for Availability
Water Flow Switches 0.1-6.0 1/4" Female NPT Celcon (polysulphone)
--
FFS-100C P.O.R. In Stock
Water Flow Switches 1.5-12 1/2" Female NPT Brass (polysulphone)
--
FFS-150B P.O.R. Call for Availability
Water Flow Switches 1.5-12 1/2" Female NPT Celcon (polysulphone)
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FFS-150C $306.00 Call for Availability
Water Flow Switches 4.0-20 1/2" Female NPT Brass (polysulphone)
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FFS-155B P.O.R. Call for Availability
Water Flow Switches 4.0-20 1/2" Female NPT Celcon (polysulphone)
--
FFS-155C P.O.R. Call for Availability
Water Flow Switches 6-30 3/4" Female NPT Brass (polysulphone)
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FFS-160B P.O.R. Call for Availability

Contact Us - Water Flow Switches