Calibrate On So Permeation Tube; Use Of Izs Or Zero/Span Valves With Remote Contact Closure - Teledyne 6400A Instruction Manual

TAI Model 6400A SO
7.6 Calibrate on SO
If the 6400A is equipped with the IZS option, it is possible to span the instrument on the
permeation tube(refer to Section 6.5). If this feature is enabled, the instrument internal valves are
set so that SO
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this known SO
permeation tube is intended to be used as a periodic span check and is not to be used as a
calibration device.
Note that this method of calibration is NOT approved by the USEPA. Permeation
tubes are known to change as temperatures are cycled, and as they age. It is
recommended that if permeation tube is used, then the instrument calibration be
checked frequently by independent means to assure accurate data.
7.7 Use of IZS or Zero/Span Valves with Remote Contact
Closure
The Zero/Span valve or IZS options 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 9-5), 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 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.
Analyzer Operator Manual, 02164, Rev. G
2
Permeation Tube
2
gas is routed through the permeation tube. The software is programmed to use
gas concentration to span the instrument by pressing CALS button. The IZS
2
NOTE
7-8