Abstract: A reversible float assembly includes a float, an elongated flexible member, a first attachment disposed on a first surface of the float body, and a second attachment disposed on a second surface of the float body. The lower end of the elongated flexible member is connected to one of the first and second attachments. At least one guide eye connected with the float body is constructed and arranged to receive an elongated guide member to restrict movement of the body to generally vertical movement. The guide eye is disposed on the body at a position between the first attachment and the second attachment so that when the body floats on a liquid in the first orientation the guide eye is submerged in the liquid, and when the body floats on a liquid in a second orientation, the guide eye is disposed above the liquid.

Abstract: An error-compensated temperature measurement system has a temperature sensor, an amplifying circuit and a compensation circuit for compensating non-linearities in the amplifying circuit of the temperature sensor. Specifically, the amplifying circuit has an analogue to digital converter exhibiting non-linearity characteristics, and the compensating circuit automatically compensates these non-linearities as well as correcting for the self-zero and self gain characteristics of the amplifying circuit.

Abstract: A tank gauging system includes an improved level sensor float providing positional information to a level encoder unit having two slotted disks coupled to a gaugehead which alternately admit and interrupt light to optical sensors to provide relative incremental positional change and direction information as well as an error detection capability. The light optical sensors provide two signals, which are directly compared to provide a clock signal for an up/down counter. One of the two signals is delayed and this delayed signal is directly compared against the other signal to provide a direction signal for an up/down counter. A microprocessor converts this information to absolute data and provides it to a transmitter unit. The transmitter may also be provided with data from other gauging sensors, such as an error-compensated temperature measurement of the tank contents.