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Analyzer Overview
3.2 Calibration
In order to ensure accurate measurements, the analyzer should be calibrated periodically. The
zero is achieved chemically and internally in the analyzer. The system slope is controlled by
comparison to a standard solution of known concentration. Further information regarding
calibrations can be found in the section entitled Calibration on page 51.
3.3 Analyzer outputs
The instrument can measure silica concentration from three different sources:
• the process sample during a normal measuring cycle
• the calibration solution during an automatic calibration
• an external sample during the grab sample operation
Whatever the sample source, the measurement cycle structure is identical and all analyzer
outputs (e.g. 4/20 mA outputs, screen display, RS485 data, alarm status, etc.) are refreshed
during the last minute of the measurement.
3.4 Maintenance
To ensure a high degree of accuracy is maintained by the analyzer, it is recommended to
perform a specific maintenance procedure once a year. All replacement parts and fittings are
available by purchasing the maintenance kit 09120=A=8000 which contains enough parts and
fittings for two years.
Full details on this procedure and the contents of the maintenance kit can be found in Yearly
maintenance on page 60.
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