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Model GFC7000E Instruction Manual Operating Instructions
04584 Rev A1 99
• EXITZR, EXITSP, SLPCHG (exit zero, exit span, slope change): Sampling at the
end of (irregularly occurring) calibrations or when the response slope changes.
These triggering events create instantaneous data points, e.g., for the new slope
and offset (concentration response) values at the end of a calibration. Zero and
slope values are valuable to monitor response drift and to document when the
instrument was calibrated.
• WARNINGS: Some data may be useful when stored if one of several warning
messages appears such as WTEMPW (GFC wheel temperature warning) or
PPRESW (purge pressure warning). This is helpful for trouble-shooting by
monitoring when a particular warning occurred.
6.12.2. Default iDAS Channels
A set of default Data Channels has been included in the analyzer’s software for logging CO
2
concentration and certain predictive diagnostic data. These default channels include but are not
limited to:
CONC: Samples CO
2
concentration at one minute intervals and stores an average every hour
with a time and date stamp. Readings during calibration and calibration hold off are not included
in the data. By default, the last 800 hourly averages are stored.
PNUMTC: Collects sample flow and sample pressure data at five minute intervals and stores an
average once a day with a time and date stamp. This data is useful for monitoring the condition of
the pump and critical flow orifice (sample flow) and the sample filter (clogging indicated by a drop
in sample pressure) over time to predict when maintenance will be required. The last 360 daily
averages (about 1 year) are stored.
CALDAT: Logs new slope and offset every time a zero or span calibration is performed. This Data
Channel also records the instrument readings just prior to performing a calibration. This
information is useful for performing predictive diagnostics as part of a regular maintenance
schedule (see Section 9.1).
STBZRO: Logs the concentration stability, the electronic output of the IR detector of the most
recent measure phase and the measure/reference ratio every time the instrument exits zero
calibration mode. Data from the last 200 zero calibrations is stored. A time and date stamp is
recorded for every data point logged. This information is useful for performing predictive
diagnostics as part of a regular maintenance schedule (see Section 9.1).
STBSPN: Logs the electronic output of the IR detector of the most recent measure phase and the
measure/reference ratio every time the instrument exits span calibration mode. Data from the
last 200 zero calibrations is stored. A time and date stamp is recorded for every data point logged.
This information is useful for performing predictive diagnostics as part of a regular maintenance
schedule (see Section 9.1).
TEMP: Samples the analyzer’s bench temperature, box temperature and PHT cooler drive voltage
every five minutes and records a average once every six hours. Data from the last 400
averaging periods is recorded. A time and date stamp is recorded for every data point logged.
This information is useful for performing predictive diagnostics as part of a regular maintenance
schedule (see Section 9.1).
Note