Hanna Instruments HI 88713 User Manual

Page 9

The HI 88713 bench-top Turbidity meter has a unique Tutorial Mode that provides additional
information to help the unexperienced user during the measurements. The instrument displays a screen,
with explanations and confirmation button, when a preparation or other operation has to be performed
by the operator. The instrument resumes the measuring sequence when the operator confirms that the
requested operation was done.

To disable this mode, when in the main screen,
press the SETUP key to enter the setup, and then
press DOWN key until the “Tutorial” line is
highlighted. Press the “Disable” key then press
ESC to return to the main screen.

RANGE SELECTION

The HI 88713 bench-top Turbidity meter has four
measuring modes: FNU, FAU, NTU Ratio and NTU
Non Ratio. When the instrument is in the main
screen, the selected mode is displayed in the right
side of the LCD, on the message line.
To change the mode, press the RANGE key.
When the display shows the Change mode screen,
use the UP or DOWN key to select a new mode .
Press “CFM” key to select the new mode. The
instrument returns to the main screen.

TUTORIAL MODE

HELP MODE

The HI 88713 bench-top Turbidity meter offers an interactive contextual help that assists the user
at any moment.
To access help screens, just press HELP.
A screen with additional information will appear.
To read all available information, scroll down or
up text using the UP or DOWN key.
Press the “Support” key to access a list of the
Hanna support centers and their contact information.
Press the “Accessories” key to view a list of the
instruments accessoies.
To exit support or accessories screens, press ESC, and
the instrument will return to the previous help screen.
To exit help mode just press the HELP key again
and the meter will display the previous screen.

MEASUREMENT PROCEDURE

When taking turbidity measurements, several basic rules should be followed:
• Always use cuvettes without scratches or cracks because they can cause inaccurate readings.
• Always cap the cuvettes to prevent spillage of the sample from spilling the instrument.
• Always close the cuvette cover during measurement.
• To prevent contamination of the optical system, do not use too mush silicon oil.

To take turbidity measurements:
• Turn the instrument ON by pressing ON/OFF.

When dashes are displayed on the LCD, the

instrument is ready. The current time appears in

the upper left corner of the display and the

mode name appears on the right side of the

LCD, in the message line.

• Fill a clean, dry cuvette with 10 mL of sample up to

the mark, only handle the cuvette by the top.