Out of the 3 parameters we compensate for (temperature, salinity and pressure),
temperature by far has the greatest effect. The D.O. circuit has its temperature
compensation set to 20˚C by default. If the temperature is more than 2˚ or 3˚ from
20˚, the temperature should be transmitted to the device.
Salinity has a significate, but lesser effect on the waters ability to hold oxygen. If the water
has a conductivity of less than 2,500µs it can be considered insignificant and omitted. If
the salinity of the water is constant it can be set once and left alone. This is because small
fluctuations in salinity will have no effect on the readings.
Pressure is the least used parameter. The EZO™ class D.O. circuit assumes that it is
operating at atmospheric pressure. Sure, the probe is under water and cannot be
at atmospheric pressure however, we are not talking about small differences. Pressure
should be used when the probe is reading in 10+ meters of water, or it is connected to a
pipe and that pipe is pressurized.
Adjusting theses three parameters as needed will insure accurate D.O. readings.
Salinity and pressure settings are stored in the devices EEPROM and will not be lost if the
power is cut. Temperature is not stored and will be lost if the power is cut. It will return to
its default of 20 C