38
CONDUCTIVITY CALIBRA
TION (HI98194, HI98195 only)
A conductivity calibration is used to adjust for variations in cell factors by using a standard solution
of known conductivity. Oily coating and biological contaminants are the primary cause of calibration
drift in conductivity sensors.
This type of fouling changes the apparent cell geometry, resulting in a shift in cell constant. Before
performing a conductivity calibration inspect the EC sensor for debris or blockages. The EC electrodes
are situated inside the two small channels found in the bottom of the conductivity sensor. Clean using
the small brush from the probe maintenance kit. Flush with water. A mild detergent may be used to
remove oily coatings. Always flush with clean water after cleaning.
Note: For a correct conductivity calibration, the probe shield or the calibration beaker must
be used.
The conductivity calibration menu includes 3 different types of
calibration: Conductivity, Absolute conductivity and Salinity.
The “Conductivity” option allows a single point calibra‑
tion with a standard solution selectable by the user. This
calibration is temperature compensated.
The “Absolute conductivity” option allows a single point
calibration with a conductivity solution of known non‑temperature compensated value at the current
temperature.
The “Salinity” option allows calibration with a standard salinity solution.
The 3 calibrations are related, so that each one will calibrate all 3 measurements.
Note: To improve accuracy, choose a calibration standard near the sample
conductivity.
Choose “Conductivity calibration” from the “Calibration” menu.
Select the calibration type using the / keys and press
Select
to confirm.
Conductivity
• Select the “Conductivity” option and press
Select
to confirm.
• Fill the calibration beaker with a conductivity standard (see APPENDIX C ‑ “Accessories” for choos‑
ing the proper HANNA standard solution).
• Pour additional standard into a second beaker to be used to rinse the sensor.
Summary of Contents for HI98194
Page 9: ...9 SENSOR AND PROBE INSTALLATION ...
Page 25: ...25 SETUP MENU STRUCTURE ...
