FLOWPULSE INSTRUCTION MANUAL
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CHAPTER 6 COMMON QUESTIONS AND ANSWERS
Will mechanical vibration affect flow measurement?
Typical mechanical vibration sources such as pumps are much lower in
frequency compared to the ultrasonic signal of the FlowPulse. However, in
situations where the signal strength is weak (less than 70% with maximum
sensitivity) the accuracy may be affected or there could be readings under
no-flow conditions. Very strong continuous mechanical vibration may affect
the mechanical coupling of the device. Install away from vibrational sources
if possible or use damping material between clamping band and pipe to
reduce vibration.
Is it possible to operate FlowPulse in a high noise environment?
Yes, refer to High Noise Environment section in this chapter.
What is the effect of poor pipe condition?
One of FlowPulse
’s unique strength is its ability to detect flow with very
weak ultrasonic signals. However, severe pipe corrosion, both externally and
internally, can affect the accuracy of measurement. Flaky pipe surfaces
should be cleaned and sand-down. Severe build up or deposit on the pipe
internal can also significantly attenuate ultrasonic signal.
What is the effect of pipe lining?
Any form of lining with air gap between the liner and the pipe wall will stop
ultrasonic signal. Better results can be expected with bonded liners such as
cement, epoxy, and tar. However, an on-site test is highly recommended for
lined-pipe applications.
Does FlowPulse measurement drift over time?
FlowPulse is calibrated using an in-house test-rig with a Magnetic Flowmeter
installed. Any electronically induced drift is several magnitudes smaller than
the specified variation of FlowPulse due to the precise crystal-controlled
timing circuitry.
