Use Of Zero/Span Valve With Remote Contact Closure; Automatic Zero/Span Cal/Check (Autocal); Table 9-2: Autocal Modes - Teledyne T300 Operation Manual

Calibration Procedures

9.3.3.3. USE OF ZERO/SPAN VALVE WITH REMOTE CONTACT CLOSURE

9.4. AUTOMATIC ZERO/SPAN CAL/CHECK (AUTOCAL)

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Contact closures for controlling calibration and calibration checks are located on the rear
panel CONTROL IN connector. Instructions for setup and use of these contacts can be
found in Section 3.3.1.6.
When the appropriate contacts are closed for at least 5 seconds, the instrument switches
into zero, or span calibration mode and any internal zero/span valves installed will be
automatically switched to the appropriate configuration.
•
The remote calibration contact closures may be activated in any order.
•
It is recommended that contact closures remain closed for at least 10 minutes to
establish a reliable reading.
•
The instrument will stay in the selected mode for as long as the contacts remain
closed.
If contact closures are being used in conjunction with the analyzer's AutoCal (see
Section 9.4) feature and the AutoCal attribute "CALIBRATE" is enabled, the
T300/T300M will not recalibrate the analyzer until the contact is opened. At this point,
the new calibration values will be recorded before the instrument returns to Sample
Mode.
If the AutoCal attribute "CALIBRATE" is disabled, the instrument will return to
Sample Mode, leaving the instrument's internal calibration variables unchanged.
The AutoCal system allows unattended periodic operation of the ZERO/SPAN valve
options by using the T300/T300M Analyzer's internal time of day clock. AutoCal
operates by executing SEQUENCES programmed by the user to initiate the various
calibration modes of the analyzer and open and close valves appropriately. It is possible
to program and run up to three separate sequences (SEQ1, SEQ2 and SEQ3). Each
sequence can operate in one of three modes, or be disabled.
Table 9-2: AUTOCAL Modes
MODE NAME
DISABLED Disables the Sequence.
ZERO Causes the Sequence to perform a Zero calibration/check.
Causes the Sequence to perform a Zero point calibration/check followed by a
ZERO-SPAN
Span point calibration/check.
SPAN Causes the Sequence to perform a Span concentration calibration/check only.
Teledyne API – Model T300/T300M CO Analyzer
ACTION
06864B DCN6314