Hach-Lange AMTAX indoor sc - Manual (Page 43)

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Operation
5.5 Measurement process
Note: Make sure that all solutions are available to avoid incorrect
measurements.
After start up, the instrument needs to warm up to automatically
initalize the measurment process. This process takes
approximately 15 minutes when the instrument temperature is
>15 °C (>59 °F).
Note: Lower instrument temperatures prolong the warming-up phase.
Note: From the service mode press START to confirm the inquiry to start
the measurement.
Note: The instrument calibrates before starting the measurment when the
last calibration is at least one day old.
An optimal measurement cycle may take 5 minutes.