CS271530B1 - Device for signalling and limiting electroconductive liquids' level height - Google Patents

Abstract

The device solves a technical problem of signalling and the limiting of the maximum and minimum level of electrically conductive liquids in mobile and stationary cisterns, in which fittings or shells are connected with an electric power supply pole. One electrode of the sensor (BQ1) is isolated from the shell by means of a non-wettable liquid and is connected through a resistor (R6) with an inverting input comparator (NA1) and through another resistor (R4) with an electric power supply pole. Referential voltage is connected to the second input of the comparator (NA1).<IMAGE>

Description

(57) The device addresses the technical problem of signaling and limiting the max. and min. of electrically conductive liquid in both mobile and stationary tanks, in which the fittings or casing are connected to the field of the electric power source. One emitter electrode (BQ1) is insulated from the housing by a non-wettable liquid and is coupled through the cross section (R6) to the inverting comparator input (NA1) and through the resistor (R4) to the field of the power source. The reference voltage is connected to the second comparator input (NA1).

ГЛ 530 Bl

dl

CS 271 530 B1

The invention relates to a device for signaling and limiting the level of electrically conductive liquids.

Float sensors on mobile vehicles exhibit low reliability, short lifetime due to oscillations during travel, and the cost and installation and installation costs are high for both stationary and mobile tanks. Ultrasonic and capacitive sensors are complicated, the cost of application is high.

The above-mentioned deficiencies are eliminated by a device for signaling and limiting the maximum level of electrically conductive liquids in plastic and metal tanks, on mobile and stationary vehicles, which have fittings or shells connected to one field of the power source, which is the stripped electrode of the sensor is coupled to the power source field and the other through the comparator input inverting resistor and the comparator input inverting resistor and through the resistor 8 through the second power source field, the second comparator input being connected to the center of the divider consisting of resistors and output The comparator is led through a resistor, a Zener diode, based on a transistor whose collector is connected to a relay.

After galvanic connection of one electrode sensor with minus field of electric power source, it is possible to use a very simple electronic element - comparator to energize the relay used to control the filling power member - emptying the tank and signaling the level status. The new effect will result in a significant increase in the reliability of the system compared to the aforementioned and significant reductions in acquisition and procurement costs.

The drawing illustrates the operation of level detection.

If the sensor electrodes 108 are not immersed in the sensed liquid, at the inverted input of the comparator NAJ. the full supply voltage is applied through the resistor R4. Output 1 is at a low potential that does not excite transistor VTji and relay KAJ via resistor R2 and Zener diode VJ2. remains unchecked. Its break contact allows tank filling and switching signaling of filling.

After immersing the sensor electrodes in an electrically conductive liquid, the potential R4 at R6 is so low that a change in the output state of the comparator NA1 occurs. The resulting potential is transmitted through resistor R2 and the Zener diode VB2 and causes the transistor W to be energized, thereby causing the relay KAJ to be closed. Its normally open contact signals the filling state and the normally open interrupts the charging unit.

The sensing device of FIG. 2 is used in the tank car CAV 16, where its application in the verification series and later in the series production. Application is also expected for the CAK 8 sewer vehicle «

The device can be used wherever it is necessary to sense the level of electrically conductive liquids as well as aggressive when suitable metal electrodes are used.

Claims (1)

BACKGROUND OF THE INVENTION A device for signaling and limiting the level of electrically conductive liquids in plastic and metal tanks, mobile or stationary, having fittings or sheaths connected to the first field of a power source, characterized in that one of the sheathed electrodes of the sensor (BQ1) ) is connected to the power source field and the other through the resistor (R6) with the inverting comparator input (NA1) and through the resistor (R4) with the second power source field, the second comparator input (NA1) connecting the center of the divider consisting of resistors (R3) and (R4) and the comparator output (NA1) is fed via a resistor (R2), a Zener diode (VD2) based on a transistor (VTI) whose collector is connected to a relay (KAI).