| 摘要 |
A liquid density/liquid level meter includes a spring-float system that is coupled with a multiple Hall-sensor configured linear displacement transducer. The spring-float system includes springs that constrain the movement of floats on each end; the spring-float system parameters are mathematically evaluated so as to meet precise performance criteria. The linear displacement transducer includes a magnet and the Hall sensors. The linear displacement transducer and the spring-float system are coupled together within a submersible head unit. When the head unit is immersed in the liquid, the spring-float system moves the magnet, which interacts with the Hall sensors in a lateral slide-by approach that produces an analog voltage that is continuous and linear with respect to the displacement of the magnet. The output from the head unit is communicatively connected to a remote electronic module that contains a signal conditioner with a digital readout. There are two possible operating applications of this device that depend upon the two possible configurations of the floats in the system. In the liquid density application-configuration, at least two floats are used and the device is initialized to give a direct measure of the density (specific gravity) of the liquid. In the liquid level application-configuration, a single float is used and the device is initialized so as to give a continuous direct measure of the level of the liquid within a container.
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