Chapter 1. Introduction
2 PanaFlow™ LC User’s Manual
1.2 Theory of Operation
The PanaFlow™ LC uses a procedure called Transit-Time Flow Measurement. In this method, the flowmeter
transmits ultrasonic pulses through a moving liquid. The pulses that travel in the same direction as the fluid
flow (downstream) travel slightly faster than the pulses that travel against the fluid flow (upstream). The
difference in transit times is then used to calculate flow velocity.
Figure 2: Transit - Time Flow Measurement
Tracking window
locked onto
receive signal
Range of tracking window
Time
Receive signalTransmit signal
Variable time interval
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