Filter
Top Products
TAPI Model 265A Chemiluminescence Ozone Analyzer
Manual Addendum, Rev. B, DCN 5254
8
PRINTED DOCUMENTS ARE UNCONTROLLED
Step 2 - Calibrate the instrument: Zero/Span Calibration Procedure
Step Number Action Comment
1. Input zero gas Allow zero gas to enter the sample port on the rear of the
instrument.
2. Press CAL The M265A enters the calibrate mode from sample mode.
3. Wait 10 min Wait for reading to stabilize at the zero value. If you wait less
than 10 minutes the final zero value may drift. You may want
to watch the STABIL test function (moving standard
deviation) for its minimum value.
4. Press ZERO The ZERO button will be displayed once the concentration
approaches zero.
5. Press ENTR Pressing ENTR zeroes the instrument and actually changes
both offset and slope of the equations to calculate
concentration.
6. Press EXIT, input
Span gas
M265A returns to the CAL menu. Now allow span gas to
flow through the instrument.
7. Wait 10 min Wait for the O
3
reading to stabilize at the span value (watch
STABIL).
8. Press SPAN The SPAN button should be displayed once the concentration
approaches the span value. In certain circumstances at low
span gas concentrations both the ZERO and SPAN buttons
will appear. Do not press ZERO again when running span
gas!
9. Press ENTR Pressing ENTR to span the instrument actually changes the
equations so that the concentration displayed is the same as
the expected span concentration you entered above, thus
spanning the instrument.
10. Press EXIT Pressing EXIT returns the instrument to SAMPLE mode.
Step 3 - Review Quality of calibration: Calibration Quality Check Procedure