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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
7-8
Table 7-7: Enabling Dynamic Zero/Span
Step Number Action Comment
1. Press
SETUP-ACAL
Causes the M200AU go to the AutoCal menu.
2. Press PREV-NEXT Select the sequence you want for dynamic calibration.
3. Press SET Select the SET menu.
4. Press PREV-NEXT Scroll through the SET menu to the CALIBRATE attribute.
5. Press EDIT Set the CALIBRATE attribute value to ON to enable
Dynamic Span.
6. Press EXIT Causes the M200AU to return to SAMPLE mode.
With dynamic calibration turned on, the instrument will re-set the slope and offset values for the
NO and NO
x
channel each day. This continual re-adjustment of calibration parameters can often
mask subtle fault conditions in the analyzer. It is recommended that if Dynamic Cal is enabled,
the TEST functions, SLOPE and OFFSET values in the M200AU should be checked frequently
to assure high quality and accurate data from the instrument.
7.5 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 will remain in zero or span mode as long as the contacts are closed. To calibrate the
instrument at the end of the Zero/Span valve cycle (DYNAMIC CAL), the CAL_ZERO and
CAL_SPAN variables in the VARS menu must be set to ON.
The CPU monitors these two 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 7-8 shows what type of check is performed based on the
settings of the two contact closures.