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
Содержание 10D1477
Страница 18: ...FIGURE 2 1 OUTLINE DIMENSIONS 1 1 1 2 SIZES 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 2 3 ...
Страница 19: ...FIGURE 2 2 OUTLINE DIMENSIONS 2 4 SIZES 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 2 4 ...
Страница 27: ...FIGURE 2 8 MOUNTING DIAGRAM FOR 50 100 mm 2 4 SIZES 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 2 12 ...
Страница 30: ...FIGURE 2 10 GROUNDING PROCEDURE CONDUCTIVE PIPE 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 2 15 ...
Страница 32: ...FIGURE 2 11 GROUNDING PROCEDURE INSULATED PIPE 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 2 17 ...
Страница 43: ...FIGURE 5 1 SCHEMATIC FOR PRIMARY WITH REMOTE CONVERTER 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 5 3 ...
Страница 49: ...FIGURE 6 1 BASIC FLOWMETER PARTS 10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL 6 6 ...
