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Model 9110T NOx Analyzer Setup Menu
Teledyne Analytical Instruments 112
Table 5-3: Variable Names (VARS)
NO. VARIABLE DESCRIPTION
ALLOWED
VALUES
VARS
DEFAULT
VALUES
0
DAS_HOLD_OFF
Changes the Internal Data Acquisition System (DAS)
HOLDOFF timer:
No data is stored in the DAS channels during situations
when the software considers the data to be questionable
such as during warm up of just after the instrument returns
from one of its calibration mode to SAMPLE Mode.
May be set for
intervals
between
0.5 – 20 min
15 min.
1
MEASURE_MODE
Selects the gas measurement mode in which the
instrument is to operate. NO
x
only, NO only or NO
x
and NO
simultaneously.
NO;
NO
x
;
NO
x
–NO
NO
x
–NO
2
STABIL_GAS
Selects which gas measurement is displayed when the
STABIL test function is selected
NO; NO
x
;
NO
2
;
NO
x
3
TPC_ENABLE
Enables or disables the Temperature and Pressure
Compensation (TPC) feature (Section 13.9.2).
ON/OFF
ON
4
DYN_ZERO
1
Dynamic zero automatically adjusts offset and slope of the
NO and NO
X
response when performing a zero point
calibration during an AutoCal (see Section 9.5).
ON/OFF
OFF
5
DYN_SPAN
1
Dynamic span automatically adjusts the offsets and slopes
of the NO and NO
x
response when performing a sp point
calibration during an AutoCal (see Section 9.5).
ON/OFF
OFF
6
IZS_SET
Sets the internal span gas generator’s permeation tube
oven temperature. Changing this temperature will impact
the NO
2
permeation rate (Section 3.3.2.5).
30C - 70C
51C
7
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
8
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
9
CAL_ON_NO
2
Allows turning 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.
ON or OFF
OFF
1
Use of the DYN_ZERO and DYN_SPAN features are not allowed for applications requiring EPA equivalency.
IMPORTANT
IMPACT ON READINGS OR DATA
There are more VARS available when using the password, 929, for
configuration. Use caution when pressing any buttons while in this
setup. Any changes made may alter the performance of the instrument
or cause the instrument to not function properly. Note that if there is an
accidental change to a setup parameter, press EXIT to discard the
changes.
Note There is a 2-sec latency period between when a VARS value is changed
and 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.