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Advanced Features Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 125
7.2. SETUP MORE VARS: INTERNAL VARIABLES (VARS)
The GFC 7001E/EM has several user-adjustable software variables, which define certain operational
parameters. Usually, these variables are automatically set by the instrument’s firmware, but can be manually
redefined using the VARS menu.
The following table lists all variables that are available within the 818 password protected level. See Appendix
A-2 for a detailed listing of all of the GFC 7001E/EM variables that are accessible through the remote interface.
Table 7-4: Variable Names (VARS)
NO. VARIABLE DESCRIPTION
ALLOWED
VALUES
VARS
DEFAULT
VALUES
0
DAS_HOLD_OFF
Changes the Internal Data Acquisition System (iDAS)
HOLDOFF timer.
No data is stored in the iDAS channels during situations
when the software considers the data to be questionable
such as during warm-up or just after the instrument returns
from one of its calibration modes to SAMPLE Mode.
May be set for
intervals
between
0.5 – 20 min
15 min.
1
CONC_PRECISION
Allows the user to set the number of significant digits to the
right of the decimal point display of concentration and stability
values.
AUTO, 1, 2,
3, 4
AUTO
2
DYN_ZERO
1
Dynamic zero automatically adjusts offset and slope of the
CO response when performing a zero point calibration during
an AutoCal (see Section 9.4).
ON/OFF
OFF
3
DYN_SPAN
1
Dynamic span automatically adjusts the offsets and slopes of
the CO response when performing a slope calibration during
an AutoCal (see Section 9.4).
ON/OFF
OFF
4
CLOCK_ADJ
Adjusts the speed of the analyzer’s clock. Choose the +
sign if the clock is too slow, choose the - sign if the clock is
too fast.
-60 to +60
s/day
0 sec
5
STABIL_GAS
2
Selects which gas measurement is displayed when the STABI
L
test function is selected.
CO; CO
2
& O
2
CO
1
Use of the DYN_ZERO and DYN_SPAN features are not allowed for applications requiring EPA equivalency.
2
This VARS only appears if either the optional O
2
or CO
2
sensors are installed.