Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 72
6.7.1. DAS Structure
The DAS is designed around the feature of a “record”. A record is a single data point of one parameter,
stored in one (or more) data channels and generated by one of several triggering event. The entire DAS
configuration is stored in a script, which can be edited from the front panel or downloaded, edited and
uploaded to the instrument in form of a string of plain-text lines through the communication ports.
DAS data are defined by the PARAMETER type and are stored through different triggering EVENTS in
data CHANNELS, which relate triggering events to data parameters and define certain operational
functions related to the recording and reporting of the data.
6.7.1.1. DAS Channels
The key to the flexibility of the DAS is its ability to store a large number of combinations of triggering
events and data parameters in the form of data channels. Users may create up to 20 data channels and
each channel can contain one or more parameters. For each channel one triggering event is selected
and up to 50 data parameters, which can be the same or different between channels. Each data channel
has several properties that define the structure of the channel and allow the user to make operational
decisions regarding the channel (Table 6-7).
Table 6-7: DAS Data Channel Properties
PROPERTY DESCRIPTION DEFAULT SETTING RANGE
NAME
The name of the data channel.
“NONE” Up to 6 letters and digits
(more with APICOM, but
only the first six are
displayed on the front
panel).
TRIGGERING
EVENT
The event that triggers the data channel to measure
and store its data parameters. See APPENDIX A-5
for a list of available triggering events.
ATIMER See Appendix A-5 For a
complete list.
NUMBER &
PARAMETER
LIST
A user-configurable list of data types to be recorded
in any given channel. See APPENDIX A-5 for a list
of available parameters
1 – DETMES See Appendix A-5 For a
complete list.
STARTING
DATE
The starting date when a channel starts collecting
data
01-JAN-03 Any actual date in the past
or future.
SAMPLE
PERIOD
The amount of time between each data point that is
averaged into one mean reported every REPORT
PERIOD.
000:01:00 000:00:01 to 366:23:59
(Days:Hours:Minutes)
REPORT
PERIOD
The amount of time between each channel data
point.
000:01:00
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 specified limit has been exceeded,
the oldest data are over-written to make space for
new data.
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. Provides a
convenient means to temporarily disable a data
channel.
ON
OFF or ON
CAL HOLD OFF Disables sampling of data parameters while
instrument is in calibration mode.
When enabled here – there is also a length of the
DAS HOLD OFF after calibration mode, which is set
in the VARS menu.
OFF
OFF or ON
(Section 6.7.2.11.)
