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Triggering events define when and how the DAS records a measurement of any given data channel.  
Triggering events are firmware-specific and a complete list of Triggers for this model analyzer can be 
found in Appendix A-5.  The most commonly used triggering events are: 

  ATIMER: Sampling at regular intervals specified by an automatic timer.  Most trending 

information is usually stored at such regular intervals, which can be instantaneous or 
averaged. 

  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.   

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: 

 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. 

 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. 

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). 

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 the 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). 

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).