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Flow Reversal/Direction - Pumps
These flowmeters are designed and calibrated for unidirectional flow.
The arrow on the body of the flowmeter indicates the correct direction.
The flowmeter cannot detect flow direction, so the output signal is the
same regardless of flow direction. If your design presents the flowmeter
with momentary flow reversals, such as during valve switching, pump
operation, etc., you will see significant errors in the measured flow.
Rotary vane pumps frequently cause this condition. Contact TSI for
methods to identify and eliminate this problem.
Mounting Orientation
These flowmeters are calibrated in a horizontal position. For the
majority of uses these meters can be operated in any position. If you
are measuring flow rates near the very bottom end of the range, we
recommend a horizontal mounting position for best accuracy.
Pressure Drop
See the Specifications section for information about the pressure drop
across the instrument at various flow rates.
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