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Chapter 7 - CALIBRATION MODE
HI9829’s calibration routines are accessed by highlighting “Calibration” and pressing <Select>
from the main menu. Calibration is the process that standardizes the electrical or optical signals from
the sensors to reagent standards of known value.
Calibrations are intuitive and menu driven. All calibration data
is stored in the non volatile probe memory, allowing probes
to be connected to different meters without recalibration.
There are two types of calibrations available: the “Quick
calibration”, which is used for a single point calibration of pH,
Conductivity, and/or Dissolved Oxygen and is handy for field
work; and the “Single param. calibration” that allows each parameter to be calibrated individually.
The user may also restore each parameter to a factory default calibration.
Note: The password will be required if password protection is enabled.
To optimize measurements, it is advisable to establish the optimum calibration period required for
the measurement environment.
Calibration requirements vary with deployment conditions, for example very turbid biologically‑active
waters may require more frequent cleanings and calibrations than cleaner waters.
General calibration guidelines are listed below:
• Set up a routine service schedule where measurement integrity is validated.
This is especially important for new installation sites or long deployments.
• Inspect sensor connectors for corrosion and replace damaged sensors.
• Inspect sensor O‑Rings for damage and if necessary replace and lubricate with the grease found
in the probe maintenance kit.
• Do not handle the sensing surfaces of the sensors.
• Avoid rough handling and abrasive environments that can scratch the reactive surfaces of the
sensors.
• Avoid long‑term exposure of sensors to bright sunlight (especially chloride ISE). If possible,
calibrate in a shaded area.
• Discard standards after use. Do not return the used standards to the bottles of “fresh” solution.
• For measurements across a temperature gradient (when water temperature is drastically different
from the standards), permit the sensors to reach thermal equilibrium before conducting calibrations
or making measurements. The heat capacity of the probe is much greater than the air and the
small beakers of calibration standards.
CALIBRATION MODE
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