If I use a PAR Lite (2) meter under water, can I connect a data logger to it?
Yes, however the data logger needs to be placed on the surface (it is weather resistant, but cannot be lowered into the water). PAR readings at noon increase by the order of 0.001 umol/m²s. Can you tell me whether small readings like this are likely to be accurate? If not, what is the effective lower irradiance limit detectable by this sensor? 0,001 µmol represents a voltage of 5nV (nano Volt). As you can understand this very low voltage cannot be measured with a data logger. Besides the absolute error from the data logger, the PAR Lite also has some specifications to consider. There is the non- stability, non linearity, temperature dependence and the quantum response. Measurements under 1 µmol/m²s are not to be trusted as accurate.
