JPH0166031U - - Google Patents

Description

[Brief explanation of the drawing]

Figures 1 and 2 are block diagrams showing specific embodiments of the capacitive liquid meter of the present invention, Figure 3 is a time chart for explaining the present invention, and Figure 4 is a conventional capacitive liquid meter. FIG. 3 is a block diagram showing a liquid meter. 1A, 1B...tank unit (T/U), 5
A, 5B, 5T...Servo amplifier, 6A, 6B,
6T... Servo motor, 7A, 7B, 7T... Pointer, 8A, 8B... Compensator center unit (C
/U), 9...OSC, T...Tank total liquid amount measuring circuit (total circuit), 10...Switching command signal generation circuit.

Claims (1)

[Claims for Utility Model Registration] A sine wave voltage is supplied to one end of a variable capacitance element, which is an arm on one side of the capacitance bridge, and whose capacitance changes depending on the amount of the object to be measured in a liquid volume tank, A sine wave voltage having a phase difference of 180° from the sine wave voltage is supplied to one end of a first fixed capacitance element serving as an arm on the other side of the capacitance bridge, and a balance potentiometer and a balance potentiometer are connected to each other. a dielectric constant detection element for detecting the dielectric constant of the object to be measured, one end of which is connected to a movable terminal and the other end of which is connected to a connection point between the other end of the variable capacitance element and the other end of the first fixed capacitance element; a parallel circuit with a second fixed capacitance element, and a circuit for flowing an unbalanced current of the capacitance bridge is formed, and the other end of the first fixed capacitance element of the capacitance bridge and the other end of the variable capacitance element A servo amplifier is connected to the connection point where the other end of the second fixed capacitance element is connected, and the position of the movable terminal of the balancing potentiometer is adjusted by the output of the servo amplifier to measure the liquid amount. In a capacitance type liquid meter installed independently for each liquid volume tank of a plurality of liquid volume tanks, the movable terminal of the balancing potentiometer, the dielectric constant detection element, and the second fixed capacitance element are connected in parallel. a first switching element that is installed between the circuit and has an individual circuit terminal and a total circuit terminal and is used for switching; a second switching element installed between the connection point to which the other end of the second fixed capacitance element is connected and the servo amplifier and having an individual circuit terminal and a total circuit terminal and used for switching; and the balancing potential. a total circuit balancing potentiometer, which is provided in parallel with the yometer and has one end of a fixed terminal supplied with the sine wave voltage and a movable terminal connected to the total circuit terminal of the first switching element; a switching command signal generating circuit that outputs a signal for switching the first switching element and the second switching element at a period of a sine wave;
It is equipped with a total servo amplifier connected to the total circuit terminal of the switching element, and adjusts the position of the movable terminal of the total circuit balancing potentiometer based on the output of the total servo amplifier, thereby controlling each of the liquids in a time-sharing manner. A tank total liquid volume measuring circuit for measuring the total liquid volume in a tank;