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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
3 CALIBRATION
The M401 is designed to be used as a dedicated ozone calibrator with built-in photometer.
Zero/Span gas generation and calibration of Model 401 are discussed in Section 3. The emphasis
in Section 3 is on the operation of the buttons and the internal adjustments they make in the
instrument.
3.1 Manual Zero Air Supply
The Model 401 calibrator can generate zero air using the internal scrubbing module. Press zero
and enter password (512) to generate zero air. The IZS pump will start to run and flow control
system will maintain stable flowrate of zero air to both the photometer and the analyzer being
calibrated. Supply flowrate should exceed demand flowrate to ensure good zero measurement.
Dry air should be provided into the inlet of rear panel for internal zero air supply.
3.2 Manual O
3
Generation
Press O3GN, then enter the password (512), to generate the O
3
span gas. Specify O
3
gas
concentration up to 1000 ppb and minimum of 50 ppb and press enter to select. Again, the O
3
generator pump will start to run and the flow control system will maintain stable flowrate
through the O
3
generator. Supply flowrate should exceed demand flowrate to ensure good span
measurement. Pressing CONC allows a change of O
3
gas concentration during specified O
3
gas
generation.
NOTE
The M401 software has a "Learning" feature that will remember the
parameters from the last several concentrations that were generated
by the instrument. The first time a specific concentration is
requested, the response time may be somewhat slow. Any subsequent
requests for that same concentration will be much faster since the
instrument will remember the previous settings. This information
remains in memory even when the instrument is turned off.
3-1