Calibration Procedure of HACH Pocket Turbidimeter - Up To

Notes:
5.6 Press and hold the “Read” key until the reading is stable. Release the
“Read” key to accept this value.
5.7 Remove this solution from the cell compartment and insert the 1.0 NTU
solution. Close the lid.
5.8 Press “CAL” key until “C1.0” appears on the screen with alternating value
(normally 1.0 NTU).
5.9 Press and hold the “Read” key. When the reading is stable release the
key. The value will be accepted and stored.
5.10 Remove the 1.0 NTU solution from the cell compartment and insert the 20
NTU solution. Close the lid.
5.11 Press “CAL” key until “C20” appears on the screen with alternating value
(normally 20 NTU).
5.12 Press and hold the “Read” key until the reading is stable. Release the key
to save this value.
5.13 Press the “CAL” key to end calibration. “CLd” will be displayed on the
screen. NOTE: If E09 is displayed, then recalibrate the instrument.
If Error messages appear on the screen, check that the standards have been labeled
properly and repeat the calibration. The possible errors are listed with the corrective
actions on pages 32-36 of the instrument manual.