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Calibration Procedures Teledyne API – Technical Manual - Model 300E Family CO Analyzers
198
9.3.3.3. Use of Zero/Span Valve with Remote Contact Closure
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 3.3.4.
When the ap
propriate 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 “CA
LIBRA
TE” is enabled
, the M300E/EM 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.
9.4. AUTOMATIC ZERO/SPAN CAL/CHECK (AUTOCAL)
The AutoCal system allows unattended periodic operation of the ZERO/SPAN valve options by using the
M300E/EM 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 ACTION
DISABLED
Disables the Sequence.
ZERO
Causes the Sequence to perform a Zero calibration/check.
ZERO-SPAN
Causes the Sequence to perform a Zero point calibration/check followed by a Span
point calibration/check.
SPAN
Causes the Sequence to perform a Span concentration calibration/check only.
04288D DCN5752