3. OPERATION
Page
17
©2001~2007
DH Instruments, a Fluke Company
The value of the
gas conversion factor
can be edited as desired. Press
[ENTER]
to
return to the MAIN run screen with the entered
K factor
active.
The K factor is only
used if the current unit of measure is a flow unit (see Section 3.2.2). The letter <K>
is always appended to the flow unit indication in the run screens when the K
function is ON (e.g., sccmK).
Turning K ON or OFF or making a change to the K factor value resets the active device
channel output to zero.
K factor ON/OFF and the K factor value are device channel specific (DEV1, DEV2).
Settings made for one device channel do not affect the other channel.
3.2.2
[UNIT]
PURPOSE
To specify the unit of measure in which MFC-CB displays set points and measured
values on the active device channel.
PRINCIPLE
MFC-CB operates in either volts (V) or milliamps (mA). It also converts V or mA to flow
values using a simple linear relationship between the voltage or current range and the
flow range in a flow unit (see Section 7.1.2).
The electrical mode and range in which to operate as well as the flow unit and the flow
unit range are specified by the active MFC profile for each device channel (see
Section 3.3.1).
The units of measure available to display MFC-CB set points and measurements are V or
mA, %FS and a flow unit if the MFC profile specifies a flow unit. MFC profiles #1 and #2
are factory default profiles that do not specify a specific flow range. MFC profile #1
specifies operation from 0 to 5 V and MFC profile #2 specifies operation from 4 to 20 mA.
When using profile #1 or #2, no flow unit is available.
OPERATION
To change the unit of measure press
[UNIT]
.
The display is:
Select the desired unit of measure. Operation returns to the MAIN run screen with the
display unit changed to the selected unit.
The flow unit available under [UNIT] is determined by the MFC profile active for the
device channel. When using MFC profile #1 or #2, no flow unit is available as none is
specified by the profile. To work in a flow unit, set up and use a custom MFC profile (see
Section 3.3.1). MFC profile #1 is 0 to 5 V. MFC profile #2 is 4 to 20 mA.
The UNIT function is device channel specific. The unit setting for one device channel does
not affect the other device channel.
1V 2%FS 3sccm
Содержание MFC-CB
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