Hanna Instruments HI 95721 - 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.
13
MEASUREMENT PROCEDURE
• Turn the meter on by pressing ON/OFF.
• When the LCD displays “721”, 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.
• Add the content of one packet of HI 93721-0
Iron HR Reagent. Replace the cap and shake until
dissolution is complete.
• Replace the cuvet into the holder and ensure that
the notch on the cap is positioned securely into
the groove.
Turn the meter on by pressing ON/OFF and follow instruction manual to perform either the
MEASUREMENT, VALIDATION or CALIBRATION PROCEDURE.
MEASUREMENT PROCEDURE