7. APPENDIX
Page 87
©2001~2007
DH Instruments, a Fluke Company
7.
A
PPENDIX
7.1
CALCULATIONS
7.1.1
ELECTRICAL SET POINT AND MEASUREMENT
CALCULATIONS
MFC-CB outputs electrical values in response to output commands from the user. It also
measures electrical values. The output and measurement values can be adjusted by various
user coefficients including the calibration coefficients (see Section 5), a K factor (see
Section 3.2.1) and adjustment factors (see Section 3.3.5).
•
The electrical value to output in response to a user set point entry
is
calculated following:
(
)
0
,
,
,
,
0
,
S
a
m
K
a
m
S
S
S
adj
S
adj
S
cal
S
cal
S
E
act
+
+
⋅
+
⋅
−
=
Where:
S
= Electrical signal to output
S
act,E
= Set point target value entered by user and displayed by MFC-CB
S
0
= Electrical value output corresponding to zero flow
m
S,cal
= Set calibration
multiplier
(see Section 5.2.2.4)
a
S,cal
= Set calibration
adder
(see Section 5.2.2.4)
K
= Gas conversion factor if active unit of measure is a flow unit (see Section 3.2.1)
m
S,adj
= Set adjustment function
multiplier
(see Section 3.3.5)
a
S,adj
= Set adjustment function
adder
(see Section 3.3.5)
•
The measured electrical value to display
is calculated following:
(
)
(
)
0
,
,
,
,
0
M
a
m
K
a
m
M
M
M
adj
M
adj
M
cal
M
cal
M
act
E
+
+
⋅
⋅
+
⋅
−
=
Where:
M
E
= Displayed electrical measured value
M
act
= Unmanipulated electric signal reading
M
0
= Electrical value corresponding to zero flow
m
M,cal
= Measure calibration
multiplier
(see Section 5.2.2.3)
a
M,cal
= Measure calibration
adder
(see Section 5.2.2.3)
K
= Gas conversion factor if active unit of measure is a flow unit (see Section 3.2.1)
m
M,adj
= Measure adjustment function
multiplier
(see Section 3.3.5)
a
M,adj
= Measure adjustment function
adder
(see Section 3.3.5)
