DH Instruments MFC-CB, Operation And Maintenance Manual

Page: 41 / 104

3. OPERATION
Page 33
©2001~2007 DH Instruments, a Fluke Company
<#6> corresponds to the sixth of the six available
selections in the MFC profile unit screen. Enter the
number of the selection that you would like
to change. The display becomes:
Select the type of flow unit desired (see Table 3). Then select the desired unit.
Table 3. Available Flow Units
<1std> <2vlm> <3none>
< 1mol/s>
< 2kg/s>
< 3mg/s>
< 4slm>
< 5sccm>
< 6scfm>
< 7scfh>
< 8slh>
< 9sm3h>
< 1ccm>
< 2lm>
< 3lh>
< 4m3h>
< 6cfm>
< 7cfh>
This selection causes the
position for this unit to be
blank.
<1std> units are units of mass flow. <2vlm> units are units of volume flow.
3.3.5
<5ADJ> (ADJUSTMENT)
 PURPOSE
To apply an
adder
and/or
multiplier
to the MFC-CB set point and/or measurement.

PRINCIPLE
The adjustment function gives the user the capability to mathematically adjust the set
point output and the value measured back by MFC-CB. This is accomplished by setting
an
adder
and/or a
multiplier
.
There are separate
adders
and
multipliers
for the set point and for the measurement.
The set point
adder
and
multiplier
alter the set point actually output by
MFC-CB following:
actual set point = (requested and displayed set point *
multiplier
) +
adder
The measurement
adder
and
multiplier
alter the value measured by MFC-CB as follows:
displayed measurement = (actual measurement *
multiplier
) +
adder
The
adder
is a constant that is always expressed in terms of %FS. The full scale value is
determined by the active MFC profile (see Section 3.3.1). The
multiplier
is dimensionless.
If a K factor is active (see Section 3.2.1), the
adder
and
multiplier
are applied after the K
factor is applied. However, if the unit of measure is electrical or %FS, the K factor is
not used.
Flow unit type: 1std
3vlm 4none