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Installation and Configuration Manual 45
Calibration Check
Calibration Check General MaintenanceUsing 795X Processing Electronics
Figure 6-1 Density in-line calibration procedure
Note: The values of K0' and K2' are now used in the general density equation in the 795x, replacing
the original values of K0 and K2 on the calibration certificate for this application only.
6.4 Performance
6.4.1 Viscosity
The 7827 meter is calibrated for viscosity between 15°C and 25°C and at atmospheric pressure using
specified fluids which demonstrate Newtonian behavior.
START
IS VOS
REQUIRED?
VOS CORRECTION
METHOD GRAPHICAL
OR ANALYTICAL
SOLUTION?
ANALYTICAL
GRAPHICAL
YES
DETERMINE DENSITY
OFFSET
dD
L
FROM
V
A
AND
D
L
(fig B.1)
CALCULATE
D'
L
=
D
L
-
dD
L
IF 0.3g/cc <
D
L
< 1.1g/cc
V
C
= 64.1 + 1.414*
D
L
IF 1.1g/cc <
D
L
< 1.6g/cc
V
C
= 2346 + 0.660*
D
L
D
t
= __________________
D
L
-
K19
*(
t
L
- 20)
1 +
K18
*(
t
L
- 20)
D'
L
=
D
L
NO
A
=
V
C
-
V
A
B
= 2900 -
D
L
+
A
*24.0E+06
D'
L
= 0.5*
[
-
B
+
B
+ 11600*
D
L
]
2
-2
-2
K0'
= -1.04 -
K1
*
T
A
-
K2'
*
T
A
2
K2'
= __________________
-1.04 -
D
t
-
K1
*(
T
A
-
T
L
)
T
A
-
T
L
2
2
Where:
• D
L
= Actual density of calibrating
liquid
• D
t
= D
L
corrected for meter
temperature
• t
L
= Temperature of calibrating
liquid
• dD
L
= Density offset of calibrating
liquid from VOS profile (fig. B.1)
• D’
L
= VOS corrected density of
calibrating liquid
• τ
BA
= Time period B from the meter
in air (on calibration certificate)
• τ
BL
= Time period B in the
calibrating liquid
• V
A
= Actual VOS of calibrating
liquid
• V
C
= Calibration VOS
(For details of the VOS correction
method, refer to the Calculated
Parameters appendix.)