E-888-5-E
7.2 Flow Velocity and Viscosity Related Meter Error Correction Formula (E
1
)
7.3 Flowmeter Body's Volumetric Expansion (3
α
) Related Meter Error Correction Factor (E
2
)
As factors associated with
α
compensation, the correction type, coef
fi
cients
α
and
β
, and reference
temperature are set here. If term
α
+
β
is used in the correction formula, select correction type
α
≠
β
;
if
α
is your choice, select
α
=
β
.
E
= + (
α
+
β
)
×
(t
－
t
0
)
where t : Reference temperature [
℃
]
t
0
: Temperature [
℃
]
α
and
β
: Thermal expansion coef
fi
cients
No.
μ
μ
μ
μ
Q
E
E
E
E
S
Q
E
E
E
E
S
…
…
…
…
…
…
8
Q
8
E
8
E
8
E
8
E
8S
Q
E
E
E
E
S
Viscosity
Flow velocity (Hz)
If
μ
≦
Set viscosity
μ
S
≦
μ
E
S
= E
+ (E
－
E
) +
Similarly, factors are determined from E
S
to E
S
. The same applies to determining factors in the case
μ
≦μ
S
≦
μ
.
Next, from Q
S
, Q
through Q
are determined; Q
n
which is nearest to Q
S
, Q
n +
, E
nS
, and E
nS +
are
determined, and the calculation below is performed.
E
=
－
｛
E
nS
+ (E
(n +)S
－
E
nS
)
×
｝
÷
00
μ
×
(
μ
Ｓ
－μ
)
μ
S
×
(
μ
－μ
)
(Q
S
－
Q
n
)
(Q
n +
－
Q
n
)
7. CALCULATION FORMULAS
7.1 Uncorrected Total Flow
Q
0
= a
×
I
p
Q
0
：
Uncorrected total
fl
ow
［
L
］
a
：
Meter factor
［
L/P
］
I
p
：
Namber of input pulses
