Hach-Lange ORBISPHERE 6110 User Manual - Manual (Page 47)

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Section 6 Calibration
6.1 Calibration menu overview
This section describes the sequence of actions required to calibrate the sensors and flow meter
on the instrument:
1. Barometric pressure sensor
2. Pressure sensor
3. Temperature sensor
4. CO2 sensor
5. Flow sensor
6. O2 sensor
Note: The above is the actual sequence of events that must be followed for any calibration (i.e. if you
calibrate the CO
2
sensor, then the barometric sensor, pressure sensor and temperature sensor must be
calibrated first and in that order).
6.2 Standards requirements
It is recommended that calibrations should be made with external certified standards at least
once a year.
The instrument will provide accurate results provided accurate reference standards are used.
The following table shows the maximum ranges for the standards. These ranges should not be
exceeded.
6.3 Calibration schedule
This following table shows the recommended sensor calibration intervals (using the instrument’s
automatic calibration feature) based on an average of 500 package analyses per week. This
proposed schedule can be modified according to operating conditions.
Standard Range
Pressure ± 0.02 bar
Barometric pressure ± 2 mbar
Temperature ± 0.2°C
CO
2
sensor CO
2
at 99.9% purity at ± 0.1% which is the purge gas for the normal operation
Sensor Interval Sensor Interval
Barometric pressure sensor 6 months O
2
sensor 2 months
Flow meter 6 months CO
2
sensor 6 months
Temperature sensor 6 months Pressure sensor 6 months