User Guide

• After approximately 30 seconds, the meter will

display “125”, asking for the 125 EBC solution

to be placed in the cuvette holder.

Note: At this point the user can exit the calibration mode and save the two-point

calibration by pressing ALT+CAL keys.

• To perform a three-point calibration, place a cuvette filled with C124-2 standard

solution (@ 125 EBC) in the cuvette holder.

• Press the CAL key. “SIP” and “CL” will start blinking.

• After approximately 30 seconds, the display

will show “----”.

Now the meter is calibrated and ready for use.

VIEWING CALIBRATION DATE

To display the last calibration time and date, press

the GLP button to toggle through date and time.

If the display shows "FS", the instrument has factory

calibration settings loaded and no date will be

displayed.

STANDARD SUSPENSION

Hanna Instruments supplies C124 with the AMCO-AEPA-1 standards which has a

long shelf life at all concentrations (approximately six months, if free from

contamination). In addition, no special handling or disposal is required and a much

higher stability of suspended particles has been observed.

On the other hand, the formazine-based standards are very toxic, carcinogen and

unstable (particles flocculate and settle quickly). Lower concentrations change value

within a few days or hours after dilution from stock solutions.

The consistency of C124 readings by using both standards has been separately

established by Advanced Polymer Systems and Hanna Instruments.

Additional documentation about the formazine standard and more complex

calibration procedures is available upon request.