RMG USZ 08 series User Manual

INTRODUCTION
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Manual USZ 08 · EN05 · 2015-06
1
Introduction
By means of the transit times of ultrasonic pulses, the USZ 08 ultrasonic flowmeter measures the
flow velocity of the gas from which it calculates the flow rate at measurement conditions. Here use
is made of the fact that ultrasonic pulses move faster in the direction of flow than in the opposite
direction.

v
D
L
S1
S2
The transit times from S1 to S2 and from S2 to S1 are calculated as follows:


cosvc
L
t
0
12S


cosvc
L
t
0
21S
where:

v: mean flow velocity
c
0
: velocity of sound
: path angle to the pipe
L: path length
If measurements are taken alternatively in both directions, the velocity of sound depending on the
type of gas is no longer included in the calculation of the flow velocity:











21S12S
t
1
t
1
cos2
L
v
In order to take the flow profile into account, the USZ 08-6P takes measurements with a total of six
acoustic paths in three planes. In the case of the 3-path design of type USZ 08-3P, the two paths of
each plane crossing each other are replaced by one V-path with single reflection.

RMG USZ 08 series Specifications

General

Brand	RMG
Model	USZ 08 series
Category	Measuring Instruments
Language	English