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TAPI Model 265A Chemiluminescence Ozone Analyzer
Manual Addendum, Rev. B, DCN 5254
7
PRINTED DOCUMENTS ARE UNCONTROLLED
1.3 Initial Operation
1. Turn on the instrument power. The display should immediately light, showing the
computer’s memory configuration, then the instrument type - M265A. A diagram of the
software menu trees can be found in Figure 4-1 and Figure 4-2.
2. On power-up, an internal solenoid valve will open allowing NO to flow. Check the
NO FLOW test function on the front panel to verify that the flow is 5 cm
³/min ±20%. If
the flow is out of this range, check the inlet pressure at the rear panel and make sure that it
is 20 psi, then adjust the pressure regulator on the rear panel until the flow is within range.
3. The M265A requires about 30 minutes for all internal components to heat to operating
temperature. Many warning conditions are not displayed during this time, even though
some parameters are out of specification. All warning messages are enabled after 30
minutes of operation.
4. When the instrument is warmed up, check the TEST functions. All of the readings should
compare closely with those in Table 2-2.
5. Next is instrument calibration, which is shown in the following tables.
1.4 Instrument Calibration
Step 1 - Set the range, then enter the expected ozone span gas concentrations:
Step Number Action Comment
1. Press
CAL-CONC
This key sequence causes the M265A to prompt for the
expected span concentration. Enter the span value by pressing
the key under each digit until the expected value is set.
2. Press ENTR ENTR stores the expected span value. The internal formula is
adjusted to compute this number when span gas concentration
is input into the instrument.
5. Press EXIT Returns instrument to SAMPLE mode.
6. Press
SETUP-RNGE-
MODE-SNGL
If necessary, you may want to change the range mode.
Choices are either Single or AutoRange. Normally the
instrument is shipped in Single range mode.
7. Press
SETUP-RNGE-
SET
After the mode is set, you may want to set the maximum
range value. The instrument is shipped with the range set at
500 ppb. This setting affects only your analog outputs, not
the RS-232 output.