11
GENERAL OPERATIONS
6. GENERAL OPERATIONS
6.1. METER VALIDATION: CAL CHECK & CALIBRATION
Validation of the HI97739 involves verifying the concentration of the certified CAL Check
standards. The CAL Check screen guides the user step-by-step through the validation
process and user calibration (if necessary).
WARNING: Do not use any solutions or standards other than the Hanna
Instruments
®
CAL Check Standards. For accurate validation and calibration results,
please perform these at room temperature, 18 to 25
°
C (64.5 to 77.0
°
F).
Note: CAL Check Standards will not read the specified value in measurement
mode. Protect the CAL Check cuvettes from direct sunlight by keeping them in
the original packing. Store between 5 and 30
°
C (41 to 86
°
F), do not freeze.
To perform a CAL Check:
1. Press CAL Check from measurement mode.
The “Not Available“ message or the date, time and status of the last CAL Check
will be displayed on the screen.
2. Press Check to start a new CAL Check. Press the key at any time to abort
the validation process.
3. Use the functional keys to enter the certificate value of the calibration standard
found on the CAL Check Standard Certificate. Press Next to continue.
Note: This value will be saved in the instrument for future validation. If a new set
of calibration standards is obtained, please update the certificate value.
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