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Calibration Procedures Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 199
For each mode, there are seven parameters that control operational details of the SEQUENCE (see Table 9-3).
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” Seq 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 iDAS.
CALIBRATE
Enable to do a calibration – Disable to do a cal check only.
This setting must be OFF for analyzers used in US EPA applications and
with internal span gas generators installed and functioning.
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.
NOTE
The CALIBRATE attribute (formerly called “dynamic calibration”) must always be set to OFF for
analyzers used in US EPA controlled applications that have internal span gas generators option
installed.
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.