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DAC and APICONTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 165
Table 7-2: DAS Data Channel Properties
PROPERTY DESCRIPTION
DEFAULT
SETTING
SETTING RANGE
NAME The name of the data channel.
“NONE”
Up to 6 letters or digits
1.
TRIGGERING
EVENT
The event that triggers the data channel to measure
and store the datum.
ATIMER
Any available event
(see Appendix A-5).
NUMBER AND
LIST OF
PARAMETERS
A User-configurable list of data types to be
recorded in any given channel.
1
(COMEAS)
Any available parameter
(see Appendix A-5).
REPORT PERIOD
The amount of time between each channel data
point.
000:01:00
(1 hour)
000:00:01 to
366:23:59
(Days:Hours:Minutes)
NUMBER OF
RECORDS
The number of reports that will be stored in the data
file. Once the limit is exceeded, the oldest data is
over-written.
100
1 to 1 million, limited by
available storage space.
RS-232 REPORT
Enables the analyzer to automatically report
channel values to the RS-232 ports.
OFF
OFF or ON
CHANNEL
ENABLED
Enables or disables the channel. Allows a channel
to be temporarily turned off without deleting it.
ON
OFF or ON
CAL HOLD OFF
Disables sampling of data parameters while
instrument is in calibration mode
2
.
OFF
OFF or ON
1
More with APICOM, but only the first six are displayed on the front panel.
2
When enabled records are not recorded until the DAS HOLD OFF period is passed after calibration mode. DAS HOLD OFF SET in
the VARS menu (see Section 7.1.11
).
7.1.2. DEFAULT DAS CHANNELS
A set of default Data Channels has been included in the analyzer’s software for logging
CO concentration and certain predictive diagnostic data. These default channels include
but are not limited to:
CONC: Samples CO 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 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 of CO measurements every time a zero or
span calibration is performed and the result changes the value of the slope
(triggering event: SLPCHG). The CO stability data to evaluate if the
calibration value was stable are also stored.
This data channel will store data from the last 200 calibrations and can be used to
document analyzer calibration and is useful in the detection of the in slope and
offset (instrument response) when performing predictive diagnostics as part of a
regular maintenance schedule.
The CALDAT channel collects data based on events (e.g. a calibration operation)
rather than a timed interval and therefore does not represent any specific length of
time. As with all data channels, a date and time stamp is recorded for every logged
data point.