Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1 Manuel d'utilisateur télécharger pdf (Page 44)

EC155 CO

and H

O Closed-Path Gas Analyzer

FIGURE 9-6. ECMon Zero/Span window

l. Enter the known concentration of CO

(in ppm) in the Span

Concentration box and press Span. This will cause the analyzer to adjust

the value of its CO

Span parameter, forcing the measured CO

concentration to the value specified. Verify the CO

concentration reads

the correct value.

m. Replace the CO

span gas with an H

O span gas of known dew point.

Allow the gas to flow through the sample cell; as before, higher flows may

be desired for a couple minutes to more quickly establish equilibrium

before resuming a flow between 0.2 and 0.4 L/min. Wait for the readings

to stabilize.

n. Enter the known dew point (in °C) in the Span Dew Point box and press

Span. This will cause the analyzer to adjust the value of its H

O Span

parameter, forcing the measured dew point to the value specified. Verify

the dew point reads the correct value.

o. The zero-and-span procedure is now complete.

9.5 Replacing the EC155 Desiccant/CO

Scrubber Bottles

If more than one year has passed since replacing the desiccant/scrubber, or if

zero-and-span readings have drifted excessively (see Section 9.4, Zero and

Span above), the desiccant/scrubber bottles (pn 26511) within the EC155

analyzer head should be replaced as follows:

a. Remove the analyzer in the same way as explained in Section 9.3,

Cleaning Analyzer Windows of this manual.

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Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1 Manuel d'utilisateur Page 44