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Sight Flow Indicators

Sight Flow Indicators
Sight Flow Indicators are local visual indicators of flow rate. Viewing windows at economical prices that are easily replaceable and serviceable.
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  1. SERIES SFI-100 & SFI-300 MIDWEST SIGHT FLOW INDICATOR
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    MIDWEST Sight Flow Indicator are a dependable service at economical ...
    Starting at $158.75
  2. Series 500 Sight Window
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    Sight Window has a tough tempered glass window that resists chemical ...
    Starting at $78.50
  3. Series 550 Sight Window
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    Sight Window has fused glass style sight windows which feature glass ...
    Starting at $18.00
  4. Series SFI-300F MIDWEST Sight Flow Indicator
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    MIDWEST Sight Flow Indicator has a double window with no moving indica ...
    Starting at $942.50
  5. Series SFI-400 MIDWEST Sight Flow Indicator
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    MIDWEST Sight Flow Indicator has a glass tube construction offering ...
    Starting at $423.00
  6. Series SFI-700 MIDWEST Sight Flow Indicator
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    MIDWEST Sight Flow Indicator offer threaded process connections. Mai ...
    Starting at $414.00
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Questions

Question
If a customer complains the impeller in his sight flow indicator is not turning, what is most likely the problem?
Answer
Usually the impeller is fouled or the indicator is doing its job and actually indicating no flow.
Question
If a customer claims the plastic impeller dissolved in plain water, what probably happened?
Answer
The customer exposed the sight flow indicator to fluid temperatures of 400-500 degrees Fahrenheit, considerably in excess of the published temperature specification.
Question
I see that the SFI-300 MIDWEST Sight Flow Indicator has a flow direction shown as an arrow. What will happen if water flows in the opposite direction? Will the rotating impeller rotate in both directions? I want to use the indicator on a wakeboard boat to show water being pumped in both directions on a wake ballast system.
Answer
The inlets and outlets for SFI-300 are designed for flow to only be in one direction. You could physically push flow in the opposite direction, but you would risk damaging the impeller, and you would not get a true indication of flow.