Possibilities of measuring the local density of seawater in probe instruments

In modern expeditionary research carried out on vessels, the local density of seawater is not measured, but calculated using TEOS-10 thermodynamic equation state based cumulative measurements pressure, temperature and electrical conductivity or speed sound. The with satisfactory accuracy valid only for oceanological waters, used corrections waters marginal inland seas. These are permanently refined will be in future. It desirable to have direct any directly environment sufficient accuracy, which now 4·10-6. Laboratory made by various methods different devices, always automated, give ~ . Attempts automate these introduce them into sounding devices been several times. Experimental samples vibration, refractometric hydrostatic created tested, none introduced practice work reasons. However, scientific technological progress makes possible technical solutions previously difficult implement. This also applies modifications method measuring density, recently attracted interest developers. paper analyzes possibilities implementing multi-element resistor distributed pressure sensors, resistance profilers sensors determining spatial drop a given base subtracting sensor resistances, taking account correction. use three such mounted rods, oriented downward along axes rectangular coordinate system, provides possibility an arbitrary orientation probe relative vertical. analysis shows required instruments.