SU1597582A1 - Level pickup - Google Patents

Abstract

The invention relates to the means of controlling and controlling the level and can be used in all parts of the national household. The purpose of the invention is to simplify the design. The carrier rod 1 is designed to accommodate the elements of the level sensor 2, the circuits of which are connected to the contacts 3 of the connector. Ten contacts 3 are connected to the corresponding contact of the switch 7 of the electrodes of the group, which provides alternate connection of the source 11 of direct current to the electrodes 2 of the level sensor. Each group of optocouplers 5 cathodes of the emitting diodes 14 is connected to its contact of group switch 8 through current limiting resistance 9. The switches of group 8 are bounded by diodes 12. The outputs of switch 8 groups electrodes through current limiting resistance 9 microammeter 10 is connected to the positive source terminal 11. Minus source terminal 11 is connected to the housing. The output of the switch 8 groups is connected to the housing. 2 Il.

Description

It is designed to accommodate elements 2 of a level sensor, whose circuits are connected to the contacts of connector 3. Ten contacts of connector 3 are connected to the corresponding contact of the switch 7 of the electrodes of the group, which provides alternate connection of the DC source 11 to the electrodes 2 of the level sensor. Each group of optocouplers 5 cathodes of the emitting diodes 14 is connected to its contact of the switch 8 groups through a current limiting resistance 9. The inputs of the switch 8 groups are bridged by the diodes 12. The outputs of the switch 8 electrodes of the groups through the current limiting resistance 9, the microammeter 10 are connected to the positive terminal of the source 11. Minus terminal source 11 is connected to the housing. The output of the switch 8 groups is connected to the housing.2 Il.

The invention relates to means of controlling, controlling a level and can be used in all sectors of a national economy where it is necessary to control, stabilize a level or a predetermined volume of electrically conductive media.

The purpose of the invention is to simplify the design of the sensor ..

Figure 1 shows a level sensor in measurement mode; 2 is an electrical sensor circuit.

The level sensor contains a carrier rod 1 with electrodes 2 and a connector 3. Each electrode has outputs 4 onto the sensor surface: outputs 4io - 4i9 ten electrodes of the first group; outputs 420 - 429 ten electrodes of the second group; 4po outputs - 4п9 ten electrodes of the last group.

In each group there are ten electrodes (the number of groups is equal to n). The electronic key functions as an AOD 101D optocoupler 5, while the photodiodes of the optocouplers ensure the passage of an electrical signal from the electrode outputs to the connector pins, and the emitting diodes of the optocouplers control the photodiodes in the key mode (Fig. 2).

The sensor also contains a reservoir 6, where the level of the electrically conductive medium is measured, the switch 7 of the electrodes of the group, the switch 8 of the groups, the current-limiting resistance 9, the micro-ammeter 10 of the direct current, the source 11 of the direct current and the diodes 12.

Electrodes 2 consist of ten electrodes 2 Yu-2i9 of the first group, ten electrodes 220 -229 of the second group, ten electrodes of 2po-2п9 of the last group.

The carrier rod 1 is designed to accommodate elements of a level sensor, is made of any electrically insulating material, and allows for flexible construction. The electrodes 2, made of any material that conducts electrical current, allow flexible construction. Connector 3 - any electrical

A connector that allows you to connect to your contacts the appropriate number of level sensor circuits. Output 4 of each electrode to the sensor surface is made of high-alloy steel, which does not corrode in an aggressive electrically conductive medium.

The optocoupler 5 consists of a photodiode 13 and a radiating diode 14.

0Tank 6 - any technological

apparatus or special capacitance where the level of the conductive medium is measured.

The switch of 7 electrodes of the group is galetny to ten directions of type ПГК. 5 Each contact of switch 7 is connected to ten contacts of connector 3 to which electrodes 2 of the last group are connected, i.e. the switch 7 of the electrodes of the group provides an alternate connection of a source of direct current 11 to the electrodes 2 of the level sensor,

Switch 8 groups - also galetny type PGK. Each group of optocouplers 5 cathodes of the emitting diodes 14 is connected to its contact of switch 8 via a current-limiting resistance 9. The anode of groups of optocouplers 5 is directly connected to the positive terminal of the direct current source 11.

0

The inputs of the switch 8 groups shunted diodes 12, and the cathode of the diode 12 is connected to the previous input of the switch 8, the anode to the next. 5 The current limiting resistance 9 is chosen so as to provide the rated current of each circuit: the current in the circuits of the switch 7 electrodes of groups within 100 μA; the current in the circuit x switch groups within

0 10mA.

The output of the switch 7 of the electrodes of the groups is through the current limiting resistance 9, the microammeter 10 is connected to the positive terminal of the source 11 of direct current. The negative terminal of the DC source 11 is connected to the housing.

The output of the switch 8 groups is connected to the housing.

The level measurement algorithm using the level sensors is as follows. Set the switch 7 of the electrodes of the group to the zero position (leftmost), and the switch 8 groups to the first position (leftmost) and take readings from the DC 10 microammeter.

If microammeter 10 indicates O, it says that tank 6 is empty. If microammeter 10 shows the current value and it is close to 100 μA, this indicates the presence of an electrically conductive medium in tank 6 (you can start the measurement directly).

Then, the switch of 8 groups is switched to the disappearance of the current in the circuit according to the indication of the microammeter 10 and is returned one division back, while the microammeter 10 again shows the current value. The switch 7 of the electrodes of the group is switched until the current in the circuit disappears according to the indication of the microammeter 10 and is returned one division back, while the microammeter 10 again shows the current value. At the same time, readings are taken from switches 7 and 8, in which position they remain.

The level value of the electrically conductive medium in the tank 6 is determined by the formula

(d-1) -10+ b,

where h is the step between the contacts of the electrodes, mm;

d - indications on the switch of 8 groups;

b - readings on the switch. 7 electrodes of the group;

10 - the number of electrodes in the group.

Claims (1)

Invention Formula A level sensor containing a vertically mounted rod of electrically insulating material with electrodes combined in groups with the same number of electrodes placed on the side surface of the rod with equal vertical pitch, the switch groups and the unit for determining the electrodes in the group, the DC source and the indicator t, in order to simplify the design, the electrode detection unit in the group is designed as a switch, each contact of which is connected to the corresponding electrode, and the output the switch is connected via a series-connected input limiting resistance and an indicator is connected to a direct current source, the outputs of each group are connected to the bottom output of the electrode in this group and successively in order to arrange the groups of rod height associated with the input electronic keys, the control inputs of which are connected to the corresponding contact of the switch groups through the input, current-limiting resistances.   -. one % yr ln 2 П9