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M400E Ozone Analyzer Operator’s Manual Frequently Asked Questions and Glossary
4. FREQUENTLY ASKED QUESTIONS AND
GLOSSARY
4.1. FAQ’S
The following list was compiled from the T-API Customer Service Department's 10 most commonly asked
questions relating to the Model 400E O
3
Analyzer.
Q: How do I get the instrument to zero / Why is the zero key not displayed?
A: See Section 13.5.4 Inability to zero.
Q: How do I
get the instrument to span / Why is the span key not displayed?
A: See Section13.5.3 Inability to span.
Q: How do I
enter or change the value of my Span Gas?
A: Press the CONC key found under the CAL or CALS buttons of the main SAMPLE display menus to enter
the expected O
3
span concentration.
See Section 9.2.3.1or for more information.
Q: How do I
perform a midpoint calibration check?
A: Midpoint calibration checks can be performed using the instrument’s AutoCal feature (see Section 9.4) or
by using the
control inputs on the rear panel of the instrument (see Section 9.3.2.3). The IZS option is
requi
red in order to perform a mid-point span check.
Q: Why does the ENTR key sometimes disappear on the Front Panel Display?
A: During certain types of adjustments or configuration operations, the ENTR key 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 iDAS
Holdoff period of more than 20 minutes).
Once you adjust the setting in question to an allowable value, the ENTR key will re-appear.
Q: How do I make the RS-232 Interface Work?
A: See Section 8.1.
Q: How do I
use the iDAS?
A: See Section 7.1.
Q: How do I
make the instrument’s display and my data logger agree?
A: 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 7.4.5 of this manual.
Alternately, use the data logger itself as the metering device during calibration procedures.
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