Hanna Instruments HI 95729 - Manual (Page 8)

8
KEYPAD DESCRIPTION
• ON/OFF: to turn the meter on and off.
• ZERO: to zero the meter prior to measurement.
• READ/TIMER: this is a bi-functional key, just press for making a measurement, or hold the
key for 3 seconds to start a pre-programmed countdown prior to measurement.
• CAL CHECK: this bi-functional key allows to perform validation of the instrument just pressing
the CAL CHECK key, or hold the key for 3 seconds to enter the calibration mode.
OPERATING MODES
•
Measurement mode: default operation mode, enables both validation and measurement.
• Calibration mode: may be entered by keeping CAL CHECK pressed for three seconds ( the “CAL”
icon appears), it enables calibration of the instrument.
DISPLAY ELEMENTS DESCRIPTION
1) four digit main display area.
2) CAL: appears when the instrument operates in the
calibration mode.
3) the Month and Day icons appear above the number of month and day when a date is
displayed.
4) the blinking “Battery” icon appears when the battery voltage is getting low.
This prompt appears for 1 second each time the instrument is
turned on.
This indicates that the meter is in a ready state and zeroing can
be performed.
Sampling in Progress. This
flashing prompt appears each time the
meter is performing a measurement.
GUIDE TO DISPLAY CODES
13
b l a n k
• Replace the cap to the cuvet, and shake
gently a couple of times.
• Place the cuvet with the reacted deionized
water (blank) into the holder and ensure that
the notch on the cap is positioned securely
into the groove.
• Hold READ/TIMER for three seconds and the
display will show the countdown or,
alternatively, wait for two minutes.
• Press ZERO and "SIP" will blink on the
display.
Wait for a few seconds and the display will
show "-0.0-". Now the meter is zeroed and
ready for measurement.
• Remove the blank from the instrument.
• Remove the cap from the cuvet and discard
the blank.
• Rinse the cuvet a couple of times with the
unreacted sample and discard it.
Turn upside down the empty cuvet and shake
it to remove excess of liquid.
• Fill the same cuvet with 10 mL of unreacted
sample.
For most accurate results, use of another
clean class A laboratory pipette is strongly
recommended.
Alternatively, fill the cuvet up to the 10 mL
mark.
• Add 2 mL of HI 93729-0 Fluoride Reagent
to the cuvet by use of the 2000 µL automatic
pipette.
For a correct use of the automatic pipette,
please follow the related Instruction Sheet.
2 m L