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Data Acquisition system (DAS) and APICOM T400 Ozone Analyzer Operator’s Manual
158
7.3.1. DAS DEFAULT CHANNELS
A set of default Data Channels has been included in the analyzer’s software for logging
O
3
concentration and certain predictive diagnostic data. These default channels include
but are not limited to:
CONC: Samples O
3
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.
O3REF: Logs the O
3
reference value once a day with a time and date stamp. This
data can be used to track lamp intensity and predict when lamp adjustment or
replacement will be required. By default, the last 730 daily readings 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.
O3GEN: Logs the O
3
generator drive value once a day with a time and date stamp.
This data can be used to track O
3
generator lamp intensity and predict when lamp
adjustment or replacement will be required. By default, the last 360 daily readings
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 11.1). The
CALDAT
cha
nnel collects data based on events (e.g. a calibration operation) rather
than a timed interval. This does not represent any specific length of time since it is
dependent on how often calibrations are performed.
These default data channels can be used as they are, or they can be customized from the
front panel to fit a specific application. They can also be deleted to make room for
custom user-programmed Data Channels.
Appendix A-5 lists the firmware-specific DAS configuration in plain-text format. This
text file can either be loaded into APICOM and then modified and uploaded to the
instrument or can be copied and pasted into a terminal program to be sent to the
analyzer.
IMPORTANT
IMPACT ON READINGS OR DATA
Sending a DAS configuration to the analyzer through its COM ports will
replace the existing configuration and will delete all stored data. Back up
any existing data and the DAS configuration before uploading new
settings.
06870C DCN6332