User Guide

Instruction Manual DO 100
8
4 CALIBRATION
The amount of oxygen dissolved in water will depend on its temperature, atmospheric
pressure and its salinity. While the pressure and salinity values are manually entered into the
instrument, the temperature is being measured by the probe. It is therefore very important
that the temperature is calibrated if necessary prior to the DO calibration.
The measurements of % Saturation of DO will linearly affect the measurement for DO in mg/L.
Hence calibration in % Saturation of DO should be carried out first. This is described in the
following section.
Before calibrating, press MODE key to select the correct measurement mode. There are 2
measurement modes for DO: mg/L or ppm, and % Saturation.
NOTE: All new calibrations will automatically over-ride existing calibration values.