Hanna Instruments HI 93414 - Manual (Page 33)

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• Turn the instrument on by pressing ON/OFF.
Make sure that the instrument is in the free or
total chlorine range (the desired one).
• Press RANGE ▲ to select the desired range
(free or total chlorine). When dashes appear
on the LCD, the instrument is ready. The
“
ZERO” tag will blink on the LCD.
• Place the zero cuvette (A) in the instrument
with the mark aligned with the mark on the
instrument top.
• Close the lid and press ZERO/AVG ▼ . The
LCD will display blinking dashes and the
measuring icon during zero measurement. At
the end of zero measurement the “
-0.0-” is
displayed. The meter is now ready for
validation.
COLORIMETER CALIBRATION
The HI 93414 free and total chlorine colorimeter has a powerful CAL CHECK function that allows the
user to check the instrument calibration against a NIST traceable standard before making a set of
measurements. With the same standard, the instrument could be re-calibrated, if necessary.
Note: Free and total chlorine must be calibrated separately. Calibration of one range will not
calibrate the other range.
VALIDATION PROCEDURE
Warning: Do not validate or calibrate the instrument with standard solutions other than Hanna CAL
CHECK™ Standards, otherwise erroneous results will be obtained. For accurate validation
and calibration please perform test at room temperature, 18 to 25 ºC (64.5 to 77.0 ºF).