Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 127)

Operating Instructions Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 107
4.12. SETUP  MORE  VARS: INTERNAL VARIABLES (VARS)
The 9110TH/M 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
4-15 lists all variables that are available within the 818 password protected level. See
Appendix A2 for a detailed listing of all of the 9110TH/M variables that are accessible
through the remote interface.
Table 4-15: Variable Names (VARS)
NO. VARIABLE DESCRIPTION ALLOWED VALUES
0 DAS_HOLD_OFF
Duration of no data storage in the DAS. 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
DAS channel.
Can be between 0.5
and 20 minutes
Default=15 min.
1 MEASURE_MODE
Selects the gas measurement mode in which the instrument is to
operate. NO
x
only, NO only or dual gas measurement of NO
x
and NO simultaneously. Dual gas mode requires that a special
switching optional be installed.
NO; NO
x
;
NO
x
–NO
2 STABIL_GAS
Selects which gas measurement is displayed when the STABIL
test function is selected. NO; NO
x
;
NO
2
; O
2
1
3 TPC_ENABLE
Enables or disables the temperature and pressure
compensation (TPC) feature (Section 8.8.3). ON/OFF
Default=ON
4 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 (Section 7.7).
ON/OFF
Default=OFF
5 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 (Section 7.7).
Note that the DYN_ZERO and DYN_SPAN features are not
allowed for applications requiring EPA equivalency.
ON/OFF
Default=OFF
6 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
7 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
8 SERVICE_CLEAR
Resets the service interval timer . (Changing the setting to ON
resets the timer and then returns the setting back to default
OFF).
ON/OFF
Default=OFF
9 TIME_SINCE_SVC
Tracks the time since last service (restarts the time when the
service interval timer, SERVICE_CLEAR, is reset). 0-500000
Default=0
10 SVC_INTERVAL Sets the interval between service reminders.
0-100000
Default=0
1 Only available in analyzers with O
2
sensor options installed.
Note There is a 2-second latency period between the time a VARS value is
changed and the time the new value is stored into the analyzer’s memory.
DO NOT turn the analyzer off during this period or the new setting will be
lost.