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Calibration Procedures Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 200
The following example sets sequence #2 to do a zero-span calibration every other day starting at 2:15 PM on
September 4, 2008, lasting 15 minutes, without calibration. This will start ½ hour later each iteration.
Table 9-4: Example AutoCal Sequence
MODE AND
ATTRIBUTE
VALUE COMMENT
SEQUENCE
2
Define Sequence #2
MODE
ZERO-SPAN
Select Zero and
Span Mode
TIMER ENABLE
ON
Enable the timer
STARTING DATE
Sept. 4, 2008
Start after
Sept 4, 2008
STARTING TIME
14:15
First Span starts at
2:15 PM
DELTA DAYS
2
Do Sequence #2
every other day
DELTA TIME
00:30
Do Sequence #2 ½
hr later each day
DURATION
30.0
Operate Span valve
for 15 min
CALIBRATE
ON
Calibrate at end of
Sequence
NOTE
The programmed STARTING_TIME must be a minimum of 5 minutes later than the real time clock for
setting real time clock (See Section 6.5.4).
Avoid setting two or more sequences at the same time of the day. Any new sequence that is initiated
whether from a timer, the COM ports or the contact closure inputs will override any sequence that is in
progress.
NOTE
With CALIBRATE turned ON, the state of the internal setup variables DYN_SPAN and DYN_ZERO is set
to ON and the instrument will reset the slope and offset values for the CO response each time the
AutoCal program runs.
This continuous readjustment of calibration parameters can often mask subtle fault conditions in the
analyzer. It is recommended that, if CALIBRATE is enabled, the analyzer’s test functions, slope and
offset values be checked frequently to assure high quality and accurate data from the instrument.