Hanna Instruments HI 96731 - Manual (Page 13)

13
MEASUREMENT PROCEDURE
To compensate the meter for the sample turbidity or color, the measurement takes place in two
phases. First, the meter is zeroed using the unreacted sample. After the reagents are added the
reacted sample is measured.
• Turn the meter on by pressing ON/OFF.
The display briefly shows all tags on.
• When the beeper sounds briefly and the
LCD displays dashes, the meter is ready.
The blinking “ZERO” indicates that the
instrument needs to be zeroed first.
• Fill one graduated mixing cylinder up to
the 20 mL mark with the sample.
• Add the content of one packet of
HI 93731A-0 Zinc Reagent A, close the
cylinder and invert several times to mix
until dissolution is complete.
• Fill one cuvette with 10 mL of the reacted
sample.
• Replace the cap. Insert the cuvette into
the cuvette holder and ensure that the
notch on the cap is positioned securely
into the groove.
• Press ZERO/CFM and the lamp, cuvette
and detector icons will appear on the
display, depending on the measurement
phase.
• After a few seconds, the display will
show “-0.0-”. The meter is now zeroed
and ready for measurement.