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Gas & Liquid Mgmt > Fluid Management

Water Flow Indicators

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

SFI Water Flow Indicators
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

Ordering Table

Description Flow
g.p.m.
Termination Body* Face
Plate
Manual PartNo Price Add To
Cart
Description Flow
g.p.m.
Termination Body* Face
Plate
Manual PartNo Price Add To
Cart
Flow Indicator 0.1-6.0 1/4" Female NPT Celcon (polysulphone)
--
SFI-10C $65.00
Flow Indicator 1.5-12 1/4" Female NPT Celcon (polysulphone)
--
SFI-15C P.O.R.

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