Hanna Instruments HI 9829, Instruction Manual

Page: 47 / 99

47
Salinity
The measurement of salinity is based on the Practical Salinity Scale which uses
the EC measurement. If the user has a standard with known PSU value it may be
used to calibrate the conductivity sensor.
• Select “Salinity” from the “Conductivity calibra-
tion” menu.
• Use the keypad to enter the known salinity value
of the calibration solution. Press <Accept> to
confirm.
• Fill the calibration beaker with salinity standard of known value.
• Pour additional standard into a second beaker to be used to rinse the sensor.
• Immerse the sensor into the rinse beaker and raise and lower the beaker to
ensure that the EC sensor channels are filled with fresh standard.
• Place the calibration beaker with standard over the EC sensor and dislodge
any trapped gas bubbles. Screw the beaker into place.
• Wait for the reading to stabilize. The stability timer will count down and <Con-
firm> will appear.
• Note the temperature and adjust the salinity value if needed.
• Press <Confirm> to save the calibration.
• After confirmation, the following messages are displayed: “Storing” and “Cali-
bration completed”.
• Press <OK> to return to the “Calibration” menu.
• Press ESC twice to return to the main menu.
• Press <Measure> to return to the measurement screen.
Notes These procedures calibrate the slope value. To calibrate the offset, set
the calibration point at 0 µS/cm and repeat the procedure.
If the temperature input is not within the
acceptable range (0 to 50°C), the mes-
sage “Invalid temperature” is displayed.
If the conductivity input is not within the
acceptable range, the message “Wrong
standard” is displayed.