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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
8.3 Automatic Zero/Span Check
M100AH can automatically check (AUTOCAL) its calibration each day. If provided with the
proper option, the M100AH provides this capability by using the time of day clock to signal the
computer system to check operations. When enabled, the instrument software will automatically
check zero and span (AUTOCAL) on a timed basis. Optionally, the Z/S cycle can be moved
backwards or forwards a fixed time each day (to avoid missing measurements at the same time
each day).
Setup of the AUTOCAL is covered in Section 6.3.
8.4 Dynamic Zero/Span Calibration
The AUTOCAL system described above can also optionally be used to calibrate the instrument
on a timed basis. The automatic calibration is enabled by setting CALIBRATE button to ON
under each SEQUENCE setup (Refer Section 6.3). In addition of AUTOCAL setup, Dynamic
Zero and/or Dynamic Span should be enabled. With Dynamic calibration turned on, the
instrument will re-set the slope and offset values for the SO
2
concentration. To set DYN_ZERO
or DYN_SPAN, press SETUP-MORE-VARS-ENTR and press NEXT repeatedly until
DYN_ZERO is shown. Press EDIT and toggle OFF (disabled) or ON (enabled).
This continual re-adjustment of calibration parameters can often mask subtle fault conditions in
the analyzer. It is recommended that if Dynamic Calibration (especially Dynamic Span) is
enabled, the TEST functions, and SLOPE and OFFSET values in the M100AH should be
checked frequently to assure high quality and accurate data from the instrument.
8.5 Use of Zero/Span Valves with Remote Contact Closure
The Zero/Span valve option can be operated using Remote Contact Closures provided on the rear
panel. See Figure 2-2 for connector location and pinout. When the contacts are closed, the
analyzer will switch to zero or span mode. The contacts must remain closed for at least 1 second,
and the analyzer will remain in zero or span mode as long as the contacts are closed. If either
DYN_ZERO or DYN_SPAN is enabled (refer Table 10-5), the calibration is adjusted at the end
of the zero or span time, otherwise zero or span is just checked, not adjusted. To set
DYN_ZERO or DYN_SPAN, press SETUP-MORE-VARS-ENTR and press NEXT repeatedly
until DYN_ZERO is shown. Press EDIT and toggle OFF (disabled) or ON (enabled).
The CPU monitors these contact closures and will switch the analyzer into zero or span mode
when the contacts are closed for at least 1 second.
In order to do another remote check, both contact closures should be held open for at least 1
second, then may be set again. Table 8-7 shows what type of check is performed based on the
settings of the contact closures.
8-6