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There are two acceptable methods of generating accurate CO concentrations for
calibrating the Model 300.
One method uses a single cylinder of CO-in-air and a means of accurately diluting the
cylinder gas with zero air. This is illustrated in Figure 8.1.
Alternatively, several cylinders of CO-in-air, of appropriate concentrations, may be used
without dilution.
The cylinder concentrations must be traceable to NIST standards.
Flow correction for standard temperature and pressure (STP) is not required with either
method. With dilution, the correction is self-canceling. With the multi-cylinder method,
the correction is not applicable.
8.2.1 PROCEDURE
1. Set the Analyzer to the desired range. (The EPA-approved ranges are any
range between 0-10 ppm and 0-50 ppm.)
2. Set the calibration system to deliver a flow of at least 1500 cc/min. The
Model 300 draws approximately 800 cc/min. (See Section 8.1 and Figure
8.2 for vent flow calculation.)
3. Pre-calculate the calibrator flow to be sure that a CO concentration of 80%
of URL (upper range limit) can be produced with enough surplus flow to
provide an adequate vent flow.
4. Connect the Analyzer REC (recorder) terminals to a calibrated strip-chart
recorder. For best accuracy, connect a DVM to the same terminals or to
the DAS (Data Acquisition System) terminals.
The standard output voltage of 0-5.0 VDC.
If, in service, data is to be collected from a device (printer) connected to
the RS-232 port, then the calibration data must be collected from the RS-
232 port.
5. Set the calibrator to deliver zero air to the manifold.
6. Push “CAL” on the Analyzer front panel.
7. Enter password. (If Enabled)
8. Wait 15 minutes for the Analyzer to stabilize.
9. Push “ZERO” and “ENTR” on the front panel. The Analyzer is now
“zeroed.”
10. Push “EXIT,” “EXIT.” (Return to sample mode.)
11. Record the DVM reading and the percentage chart reading or the RS-232
output.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 74