Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 73)

Model 9110EH Instruction Manual Operating Instructions
6.6. Setup - Internal Variables (VARS)
The M9110EH 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 re-defined using the VARS menu. Table 0-5 lists all variables that are
available within the 818 password protected level. See Appendix A2 for a detailed listing of
all of the M9110EH variables that are accessible through the remote interface.
Table 0-5: Variable Names (VARS) Revision C.4
Variable Description Allowed Values
DAS_HOLD_OFF Duration of no data storage in the iDAS. This is the time
when the analyzer returns from one of its calibration
modes to the SAMPLE mode. The DAS_HOLD_OFF can be
disabled in each iDAS channel.
Can be between 0.5
and 20 minutes
Default=15 min.
TPC_ENABLE Enables or disables the temperature and pressure
compensation (TPC) feature (Section 10.4.3). ON/OFF
Default=ON
DYN_ZERO Dynamic zero automatically adjusts offset and slope of
the NO and NO
X
response when performing a zero point
calibration during an AutoCal (Chapter 7).
ON/OFF
Default=OFF
DYN_SPAN Dynamic span automatically adjusts the offsets and
slopes of the NO and NOx response when performing a
zero point calibration during an AutoCal (Chapter 7).
Note that the DYN_ZERO and DYN_SPAN features are not
allowed for applications requiring EPA equivalency.
ON/OFF
Default=OFF
SFLOW_SET Adjusts the displayed value of the sample flow rate to the
actual flow rate, which was measured by the user.
Changing this value does not alter the actual sample gas
flow rate!
0-1000 cm³/min
Default=
500 cm³/min
OFLOW_SET Adjusts the displayed value of the ozone flow rate to its
actual flow rate, which was measured by the user.
Changing this value does not alter the actual ozone gas
flow rate!
10-1000 cm³/min
Default=
80 cm³/min
IZS_SET Sets the IZS oven temperature. Increasing or decreasing
this temperature will increase or decrease the NO
2
permeation rate of the IZS source (Section 5.6.3).
30°C - 70°C
Default= 50°C
CONC_PRECISION Allows to set the number of decimal points of the
concentration and stability parameters displayed on the
front panel.
AUTO, 1, 2, 3, 4
Default=AUTO
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
Default=0
CAL_ON_NO
2
Allows to turn ON and OFF the ability to span the
analyzer with NO
2
, in which case the instrument acts as if
NO and NO
X
are spanned, even though it is supplied with
NO
2
. The NO
2
concentration is then zero by default.
This feature is not permitted for EPA protocol
applications.
ON or OFF
Default=OFF
M9110EH Rev 0 59