5. GFS TOOLS SOFTWARE
Page 65
© 2007 DH Instruments, a Fluke Company
5.1.5.2.1
GFS Control Panel
The GFS Control Panel is the main information interface to the GFS system. The
display contains all the most basic information to determine the state of the GFS and
change the flow. Included are specific instrument outputs, flows, time, and
accumulated mass. The information and fields are summarized in the table below.
Figure 38:
GFS Control Panel section of GFS Run Screen
Table 15.
GFS Control Panel Fields
FEATURE
DESCRIPTION
Circular
Ready/Not Ready
Indicator
Use this indicator as a quick reference to determine the uncertainty on the
GFS flow. The indicator will be one of 3 colors and may include text in the
display . The color codes are listed below.
Green
– The GFS accumulated the final tolerance mass defined by the
sample criteria.
Blue
- The GFS accumulated the starting sample tolerance mass defined by
the sample criteria.
Red
– The GFS is either Idle, has an error or has not accumulated enough
mass to reach the starting sample tolerance.
Text that displays within the indicator are used to describe system errors or
warning condition. Use
[Setup][Configuration][Limits]
to modify the limits
used to generate the warnings.
Z
– The balance PRT has changed temperature more than the configured
limit. An AutoZero operation or a Balance Zero operation should be
performed to correct for any drift in the balance.
C
-
The cylinder temperature probe (TH Probe #3) has a rate of change of
temperature that exceeds the configured limit. This can happen under high
flow conditions. Abort flow control and allow the cylinder to reach equilibrium
before continuing.
D
– The infrared temperature from the surface of the cylinder has reached the
dew point. Water vapor buildup on the reference gas cylinder ultimately
results in a lower mass flow rate from the GFS. The extra mass of water
reduces the net mass loss of the cylinder for a given period of time. This
condition will occur under sustained high flow conditions. When this limit
displays, abort flow control and wait for the cylinder to reach equilibrium.
E
– One or more of the ambient sensor probes on the LCM is not responding
properly. Make sure that all probes on the LCM are properly connected. The
error may also be the result of faulty calibration data.
P
– The calculated reference gas cylinder pressure is below 200psi. Below
this value pressure regulation in the cylinder loop is no longer consistent and
can lead to faulty flow data. Re-fill the cylinder to remedy the situation.
T
– The temperature difference between ProbeTH1 and ProbeTH2 exceeds
the limit defined by
[Setup][Configuration][Limits]
. Verify that the probe
calibration data is valid. Both probes must be securely connected to the LCM
and positioned next to the GFS. (see section 3.3.13, Setup probe locations)
Calibration Gas
The current calibration gas selected at the start of a manual test or defined in
a
Test Definintion
.