26
CALIBRA
TION
8. CALIBRATION
In the measurement screen press
Menu
. Use the arrow keys to highlight “Calibration” and press
Select
. Use the arrow keys to highlight the desired option and press
Select
.
All calibration data is stored in the non volatile probe memory, allowing probes to be connected to
different meters without recalibration.
Options:
•
Quick calibration
: Single point pH and conductivity calibration.
•
Single parameter calibration
: Calibrate each parameter individually (pH, ORP, conductivity,
temperature, pressure).
Note:
The password will be required if password protection is enabled.
Calibration Guidelines
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 supplied
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. 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.
