Inability To Span - Deactivated Span Button; Inability To Zero - Deactivated Zero Button - Teledyne T200 User Manual

3. Once the instrument passes a leak check, do a flow check (this chapter) to ensure
that the instrument is supplied with adequate sample and ozone air.
4. Confirm the sample pressure, sample temperature, and sample flow readings are
correct and steady.
5. Verify that the sample filter element is clean and does not need to be replaced.

INABILITY TO SPAN - DEACTIVATED SPAN BUTTON

In general, the analyzer will deactivate certain buttons whenever the actual value of a
parameter is outside of the expected range for that parameter. If the Span is grayed out, the
actual concentration must be outside of the range of the expected span gas concentration,
which can have several causes.
1. Verify that the expected concentration is set properly to the actual span gas
concentration in the CONC sub-menu.
2. Confirm that the NO
This can be done by comparing the source with another calibrated analyzer, or
•
by having the NO
3. Check for leaks in the pneumatic systems as described in Section 5.6.11.
Leaks can dilute the span gas and, hence, the concentration that the analyzer
•
measures may fall short of the expected concentration defined in the CONC sub-
menu.
4. If the low-level, hardware calibration has drifted (changed PMT response) or was
accidentally altered by the user, a low-level calibration may be necessary to get the
analyzer back into its proper range of expected values.
One possible indicator of this scenario is a slope or offset value that is outside of
•
its allowed range (0.7-1.3 for slope, -20 to 150 for offsets). See Section 5.7.10.4
on how to carry out a low-level hardware calibration.

INABILITY TO ZERO - DEACTIVATED ZERO BUTTON

In general, the analyzer will deactivate certain buttons whenever the actual value of a
parameter is outside of the expected range for that parameter. If the Zero button is grayed
out, the actual gas concentration must be significantly different from the actual zero point
(as per last calibration), which may be for any of several reasons.
1. Confirm that there is a good source of zero air. If the IZS option is installed, compare
the zero reading from the IZS zero air source to a zero air source using NO
Check any zero air scrubber for performance. It may need to be replaced (Section
5.6.4.2).
2. Check to ensure that there is no ambient air leaking into zero air line. Check for leaks
in the pneumatic systems as described in Section 5.6.11.
083730200A DCN7962
span gas source is accurate.
x
source verified by an independent traceable photometer.
x
Teledyne API T200 NO/NO /NO Analyzer with NumaView™ Software
2 x
-free air.
X
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