17
VALIDATION PROCEDURE
• Select the parameter code for free chlorine
“734f” or total chlorine “734t” by holding
ZERO/SET (see page 14).
• Place the CAL CHECK Standard Cuvet
A
into the
holder and ensure that the notch on the cap is
positioned securely into the groove.
• Press ZERO and “SIP” will blink on the display.
• After a few seconds the display will show
“-0.0-”. The meter is now zeroed and ready for
validation.
• Remove the cuvet.
• Place the CAL CHECK Standard HI 95734-11
Cuvet
B
into the holder and ensure that the
notch on the cap is positioned securely into the
groove.
• Press CAL CHECK and “SIP” will blink during
measurement.
• Wait for a few seconds and the display will show
the validation standard value.
The reading should be within specifications as
reported on the Cal Check Standard Certificate.
If the value is found out of specifications, please
check that the cuvets are free of fingerprints, oil
or dirt and repeat validation. If results are still
found out of specifications then recalibrate the
instrument.
Use the validation procedure to ensure that the instrument is properly calibrated.
Warning
: do not validate or calibrate the instrument with standard solutions other than the Hanna
CAL CHECK Standards, otherwise erroneous results will be obtained.
