Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1 Bedienungsanleitung PDF herunterladen (Seite 43)

EC155 CO

and H

O Closed-Path Gas Analyzer

i. Examine the measurements that were written down for span CO

, span

O, and zero air. Compute the drift in instrument gain using the

following equation:

measmeas

actual

zerospan

span

gain

−

where,

• span

actual

= known concentration of the span gas

• span

meas

= measured concentration of the span gas

• zero

meas

= measured concentration in zero gas.

Note that in the zero-and- span window of ECMon, span

actual

is reported to

the right of the box where the user enters the span dew-point temperature.

The software calculates span

actual

by taking into account the dew-point

temperature and current ambient temperature and pressure. The equations

used for this calculation may be found in Appendix B. If drift (offset or

gain) for CO

or H

O is excessive, it may be time to replace the desiccant

and CO

scrubber bottles (see Section 9.5, Replacing Desiccant and

Scrubber Bottles).

j. With the zero air still flowing and measurements stabilized, click on the

Zero CO

and H

O button in the Zero/Span window. This will cause the

analyzer to adjust the values of its CO

Zero and H

O Zero parameters,

forcing the CO

and H

O concentrations to read zero. Verify the CO

and

O concentrations now read zero.

k. Now, remove the zero air source and replace it with the CO

span gas.

Allow the gas to flow through the sample cell. Watch for readings to

stabilize.

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