If you measure conductivity or keep track of evaporation, or even monitor water depth, UNIDATA offers many different instruments to suit your application. In addition to those water instruments described here, we also offer the
STARFLOW, an intelligent water flow measurement system. For shallower water (up to 2 metres), use one of the Capacitive Water Depth Probes (Model 6521) or the first in a range of Hydrostatic Water Depth Probes (Model 6542). For a wider range of water depth (up to 65 metres) and higher accuracy of data, use the Model 6541 Precision Water Level Instrument which is available in several different configurations. For water quality measurement, consider using the
Precision Water Conductivity Instrument (Model 6518-1) or the Model 6528 pH and ORP Probes.
A Note About Hydrostatic Probes
These probes use the hydrostatic pressure of water to measure depths in various environments. The hydrostatic pressure of water is dependent on the depth at which the water is measured and the atmospheric pressure.
The maximum expected change in atmospheric pressure due to the change in weather in approximately 10kPa (100hPa) which is 1% of 1000kPa (100m head of water). The 1% is within the accuracy of a hydrostatic pressure transducer.
Hence for this type of transducer it is important to relate the measurement against atmospheric pressure. For water depths of less than 100 metres (1000kPa) a gauge type transducer (Model 6542) fitted with vented cable (e.g., Model 6600E) is used. For depths greater than 100 metres you can use an absolute type transducer without vented cable.
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