Section 4: Flow Measurement; Figure 4-1 Model 3414 Transit-Time Measurement Principle - Emerson Daniel 3410 Series Operation Manual

3410 Series Gas Ultrasonic Meters Operations Manual
3-9000-777 Rev E

Section 4: Flow measurement

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Daniel 3410 Gas Ultrasonic Flow Meters measure the transit times of ultrasonic pulses passing
through the medium on two parallel planes. The measurement paths (also referred to as
"chords") are angled to the pipe axis, and each chord has two transducers acting alternately as
transmitter and receiver as shown in
both with and against the flow (upstream and downstream).
The transducers are mounted on the meter body at accurately known locations for each pipe
size so the distance L between opposing transducers and the angle are precisely defined for the
measurement path.

Figure 4-1 Model 3414 Transit-time measurement principle

Figure 4-1. This permits the transit times to be measured
Section 4: Flow measurement
January 2018
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