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T400 Ozone Analyzer Operator’s Manual Troubleshooting & Service
273
Why does the ENTR button sometimes disappear on
the Front Panel Display?
During certain types of adjustments or configuration
operations, the ENTR button will disappear if you
select a setting that is nonsensical (such as trying to
set the 24-hour clock to 25:00:00) or out of the
allowable range for that parameter (such as selecting
an DAS
Holdoff period of more than 20 minutes). Once
you adjust the setting in question to an allowable
value, the ENTR button will re-appear.
How do I make the RS-232 Interface Work? See Section 6.
How do I use the DAS? See Section 7.
How do I make the instrument’s display and my data
logger agree?
This most commonly occurs when an independent
metering device is used besides the data
logger/recorded to determine gas concentration levels
while calibrating the analyzer. These disagreements
result from the analyzer, the metering device and the
data logger having slightly different ground levels.It is
possible to enter a DC offset in the analog outputs to
compensate. This procedure is located in Section
5.10.1.8 of this manual. Alternately, use the data
logge
r itself a
s the metering device during calibration
procedures.
When should I change the Particulate Filter and how
do I change it?
The Particulate filter should be changed weekly. See
Section 11.3.1 for instructions on performing this
replac
ement.
When should I change the Sintered Filter and how do I
change it?
The Sintered Filter does not require regular
replacement. Should its replacement be required as
part of a troubleshooting or repair exercise, see
Section 12.10.1 for instructions.
When should I change the Critical Flow Orifice and
how do I change it?
The Critical Flow Orifice does not require regular
replacement. Should its replacement be required as
part of a troubleshooting or repair exercise, see
Section 12.10.1 for instructions.
How do I set up and use the Contact Closures (Control
Inputs) on the Rear Panel of the analyzer?
See Section 3.3.1.6.
Can I automatically calibrate or check the calibration of
my analyzer?
Any analyzer into which a Zero/Span Valve Option can
be automatically calibrated using the instrument’s
AutoCal Feature. Be aware that while the AutoCal
feature can be used with the IZS Option to perform
Calibration Checks, The IZS should never be used to
perform Calibrations. See Section 9.4 for instructions
on setting u
p
and activating the AutoCal feature.
How often should I rebuild the Sample Pump on my
analyzer?
The diaphragm of the Sample Pump should be
replaced annually. A sample rebuild kit is available.
See Appendix B of this manual for the part number of
the pump rebuild kit. Instructions and diagrams are
included with the kit.
06870C DCN6332