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.
13
MEASUREMENT PROCEDURE
• Turn the meter on by pressing ON/OFF.
• When the LCD displays “715”, it is ready.
• Fill the cuvet with 10 mL of unreacted sample,
up to the mark, and replace the cap.
• Place the cuvet 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 measurement.
• Remove the cuvet, open it and add 4 drops of
HI 93715A-0 First Reagent (6 drops in case
of seawater analysis). Swirl the cuvet gently
to mix.
• Add 4 drops of HI 93715B-0 Second Reagent
to the cuvet (10 drops in case of seawater
analysis). Replace the cap and swirl the cuvet
to mix.
MEASUREMENT PROCEDURE
Turn the meter on by pressing ON/OFF and follow instruction manual to perform either the
MEASUREMENT, VALIDATION or CALIBRATION PROCEDURE.
