102
Teledyne API T500U CAPS NO
2
Analyzer with NumaView™ Software
083730510A DCN8172
•
Wrong materials in contact with sample - use glass, stainless steel or Teflon materials
only.
•
Insufficient time for purging lines upstream of the analyzer. Wait for stability is
reached.
•
Insufficient time for NO
2
calibration gas source to stabilize. Wait until stability is
reached.
AREF WARNINGS
Auto Reference (AREF) warnings occur if the signal measured during an AREF cycle is
higher than 1100 Mm-1.
Note
The AREF warning displays the value of the Auto Reference
reading when the warning occurs.
(Also note that there will not be an AREF warning if the AREF
feature was disabled due to prolonged time in CAL mode.
Ensure the instrument is returned to SAMPLE mode as soon as a
calibration has been completed).
•
If this value is higher than 1100 Mm-1, check that the Auto Reference valve is
operating properly.
•
To do so, use the Utilities>Diagnostics>Digital Outputs
menu to toggle the valve
on and off.
•
Listen to hear whether the valve is switching, and see if the respective LED on
the relay board lights accordingly
•
Check the power supply to the valve (12 V to the valve should turn on and off
when measured with a voltmeter).
Note
It takes only a small leak across the ports of the valve to show
excessive Auto Zero values when supplying high concentrations
of span gas.
If the Auto Reference valve is working properly, then the problem could be due to dirty
mirrors. Please contact Technical Support (Section 5.9) to confirm this and to rule out other
possibilities.
S
UBSYSTEM
C
HECK FOR
T
ROUBLESHOOTING
The preceding sections of this manual discussed a variety of methods for identifying
possible sources of failures or performance problems within the analyzer. This section
describes how to determine if a certain component or subsystem is actually the cause of
the problem being investigated.
Summary of Contents for T500U
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