4.1.3 Volumetric Flow Rate Measurement
The magnetic flowmeter is a volumetric flow rate measuring instrument. This can be shown by
substituting the physical equivalent of liquid velocity into equation #1, preceding, as follows:
(Equation #2)
V = Q = 4Q
A
π
D
2
Substituting for V in equation #1
E
s
= 1 BD 4Q
α
π
D
2
and solving for Q:
∴
Q =
πα
D
2
.
Es
4 B
Since B =
β
E
r
and since
α
, D and
β
are constant:
(Equation #3)
Q =
γ
E
s
E
r
where:
Q = volumetric flow rate
A = cross-sectional area
D = pipe section diameter
E
s
= induced signal voltage
E
r
= reference voltage
B = magnetic flux density
α
= dimensionless constant
β
&
γ
= dimensional constant
V = liquid velocity
Volumetric flow rate is directly proportional to the induced signal voltage as measured by the
magnetic flowmeter.
10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL
4-3
Summary of Contents for 10D1477
Page 18: ...FIGURE 2 1 OUTLINE DIMENSIONS 1 1 1 2 SIZES 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 2 3 ...
Page 19: ...FIGURE 2 2 OUTLINE DIMENSIONS 2 4 SIZES 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 2 4 ...
Page 49: ...FIGURE 6 1 BASIC FLOWMETER PARTS 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 6 6 ...