period 10 minute intervals should be used to collect readings of the CO from the zero air.
From the data acquired the smallest detectable signal that can be accurately measured is
found as well as the noise which determines the stability and precision of readings.
A shut off valve should be designed into the sample manifold system, whereby the fan or
pump used to draw in the sample air is turned off and the valve isolates the fan or pump
from the sample manifold, when a calibration is in process (as ambient air is not required
for calibration and will make calibration void). This valve can be controlled manually or via
the data logger providing the data logger is designed with this function.
8.7.9 Trace Service and Maintenance
The maintenance intervals are determined by compliance standards that differ in various regions. The
following is recommended by Ecotech as a guide. Compliance with local regulatory or international
standards is the responsibility of the user. The below list only includes items that are different to a
standard range instrument.
Table 16 – Maintenance Schedule
* Suggested intervals for maintenance procedure are a guide only and may vary with sampling intensity
and/or environmental conditions. Refer to a local regulatory standard for a personalised maintenance
schedule.
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