SU718716A1 - Level meter - Google Patents

Description

It is applied to the electrodes with a capacitance of sensor 1. At the same time, a charge layer is formed in the product, which, after removing the .vCHCHoro voltage, starts discharging through resistor 2 until the voltage on the base of the first transistor is unlocked. After that, the charge-discharge cycle in measuring blocking generator 5 is set to follow the frequency of the reference sequence of pulses equal to the frequency of the following pulse sequence in the measuring blocking generator in the absence of a product between the electrodes of the sensor.

Performing a reference blocking oscillator on the second transistor of the surge element 3 with divided collectors provides compensation for the temperature and time drift of the initial values of the generator frequencies within the limits provided by the planar technology of element 3. The tracking frequencies of both pulse sequences are converted by identical frequency meters 6 and 7 into their proportional voltage which are then compared with the comparator 8. The deviation of the pulse frequency rate is measured by At a constant value of the pulse frequency of the reference generator generator, the blocking generator is proportional to the range of the product level measurement from zero to maximum.

In the level gauge shown in FIG. 2, to the base circuit of the Gh transistor of the measuring blocking generator to the terminals. The input is connected to a sensor, made in the form of two parallel steel strings with a diameter of 0.5-0.1 mm along the level of the tank with the product. The reference oscillator with a constant time is made on the transistor Tz by the master circuit CsKa. The remaining circuit elements implement two frequency meters and a colmparator.

718716

Claims (3)

1. Level meter for viscous foaming products, based on cyclical pulsed electrophoresis and self-discharge of electric capacity for known co-motivation, containing voltage comparator, connected to each other through the frequency meters with measuring and reference blocking generators and capacitive sensor with discharge resistor connected in parallel a friend, characterized in that, in order to improve the measurement of the level of viscous foaming products, a sensor with a discharge resistor is galvanically connected to the reference circuit of the test blocking generator, and the resistance of the discharge resistor is selected from the ratio where b - relative tolerance of level measurement is permissible, introduced by leaks in the product; p is the specific consumption of the product; K is the reduced length of the product between the electrodes of the sensor at the maximum immersion depth. 2. The level pillar according to claim 1, which is based on the fact that the measuring and reference block generators are made on a single planar element with separate collectors. 3. A level tier according to claim 1, which means that the sensor electrodes are made in the form of smooth strings with a minimum diameter and a minimum value ensuring the mechanical strength of the tension. Sources of information irintye into account when examining 1. USSR author's certificate JYo 380961, cl. G 01F 23/26, 1970 (prototype).