DH Instruments GFS2102, Руководство по эксплуатации и обслуживанию, Страница: 82 / 206

GFS2102™ OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company Page 66
FEATURE DESCRIPTION
Flow The rolling average flow of the GFS. The value displayed in this field is
identical to the value displayed on the
GFS Diagnostics Display <Roll Avg
Flow> field.
Accumulated
Mass
The mass accumulated by the GFS for the active accumulation. When an
accumulation is complete the last value remains on the display but does not change.
Target Flow
The current GFS target flow. When running a manual test enter a flow value
in this field and press
[Enter] to change the target flow.
Regulate Flow
(Optional Check
Box with
Numeric Entry
Field)
The regulate flow option is present to allow GFS Tools to dynamically adjust
the set point of a flow controller to achieve a nominal flow rate in either the
first or second DUT. If running a manual test, when the option is checked a
pop-up window displays allowing flow regulation to DUT1 or DUT2. The entry
field next to the check box is used to specify the regulation adjustment
interval. This is the time in seconds between set point adjustments. A value
greater than 2s is recommended as that is the time required for a molbox1
flow update.
Enclosure
Pressure
The pressure as output by the LCM ambient pressure sensor.
Enclosure
Temperature
The temperature as indicated by the LCM TH Probe #3 temperature sensor. This
probe should be placed in close proximity to the reference gas cylinder. The
enclosure temperature is used for the air buoyancy correction on the reference
gas cylinder.
Enclosure
Humidity
The humidity as indicated by the LCM TH Probe #3 humidity sensor. The
enclosure humidity value is used to determine the dew point temperature.
Elapsed Time The elapsed time since the current accumulation officially started. This time
does not include times associated with pre accumulation options such as
Time Delay, AutoZero and Balance Zero operations. Those functions occur
before the accumulation actually begins.
Time Remaining The predicted time remaining to complete the active accumulation. The value
is calculated based on the current GFS flow rate, mass used and the required
accumulation mass. At lower flow rates this indication may change
dramatically until enough mass is accumulated to stabilize the prediction.
Flow Tolerance
The approximate GFS Flow tolerance. The value is composed of the mass
and time components of the GFS uncertainty as defined in
[Setup][Configuration][LCM] and [Balance] .
5.1.5.2.2 GFS System Display
The GFS System Display is an animated operational schematic of the GFS
system including what object is currently on the balance, specific information on
the DUT(s), and the Target Mass to be accumulated. The information and fields
are summarized in the table below.
Three black lines graphically represent the flow of the gas from the Reference
Gas Cylinder through the flow path “tube” and past the DUT(s) before resetting
back to the cylinder. The lines move slowly at low flows and progressivly faster
at higher flows. This is a animated representation only and is not based on the
actual flow of gas.
Figure 39: GFS System Display section of GFS Run Screen