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Model 9110T NOx Analyzer Calibration Procedures
Teledyne Analytical Instruments 214
For each mode, there are seven parameters that control operational details of the SEQUENCE. They
are:
Table 9-3: AutoCal Attribute Setup Parameters
ATTRIBUTE ACTION
TIMER
ENABLED
Turns on the Sequence timer.
STARTING DATE
Sequence will operate after Starting Date.
STARTING TIME
Time of day sequence will run.
DELTA DAYS
Number of days to skip between each Sequence execution.
If set to 7, for example, the AutoCal feature will be enabled once
every week on the same day.
DELTA TIME
Number of hours later each “Delta Days” Sequence is to be run.
If set to 0, the sequence will start at the same time each day. Delta
Time is added to Delta Days for the total time between cycles.
This parameter prevents the analyzer from being calibrated at the
same daytime of each calibration day and prevents a lack of data for
one particular daytime on the days of calibration
DURATION
Number of minutes the sequence operates.
This parameter needs to be set such that there is enough time for the
concentration signal to stabilize.
The STB parameter shows if the analyzer response is stable at the
end of the calibration.
This parameter is logged with calibration values in the DAS.
CALIBRATE
Enable to do a calibration – Disable to do a cal check only.
For analyzers with internal span gas generators installed and
functioning, when used in US EPA applications, this setting must be
set to OFF.
RANGE TO CAL
LOW calibrates the low range, HIGH calibrates the high range. Applies
only to auto and remote range modes; this property is not available in
single and independent range modes.
IMPORTANT
IMPACT ON READINGS OR DATA
For US EPA controlled/related applications:
For analyzers used in US EPA controlled applications that have internal
span gas generators option installed, the CALIBRATE attribute must
always be set to OFF
Calibration of instruments used in US EPA related applications should
only be performed using external sources of zero air and span gas with an
accuracy traceable to EPA or NIST standards and supplied through the
analyzer’s sample port.