SU371452A1 - DEVICE FOR THE CONTROL OF UPPER AND LOWER LIMIT LEVELS OF LIQUID AND WETS BULBS - Google Patents

Description

one

The invention relates to the field of monitoring and measuring the level of liquid and wet bulk materials using electroplating sensors.

By bus. St. No. 315047 a device is known that contains a galvanic sensor connected to an electrical circuit made in the form of a transistor amplifier operating in a key mode, and the electrodes of the galvanic sensor made in the form of a common anode are connected to the input by its polarity opposite to the polarity of the amplifier supply voltage. and cathodes installed on the upper and lower monitored levels and electrically connected to each other through the normally open contact of an electromagnetic relay connected to the output of the amplifier .

In such a device, the possibility of obtaining information on the technological parameters of the controlled material is limited.

In the proposed device, the amount of information about the monitored material rises due to the fact that it is equipped with an additional cathode and a transistor amplifier connected to it with an electromagnetic output relay, a recording device connected between the additional cathode and the common anode, an electric pulse counter and a signaling device connected through relay contacts to the power supply circuit. The drawing shows an example of use.

devices for controlling the level of wet bulk materials.

The grounded anode 1, the cathodes 2, 5 and the additional cathode 4 form a galvanic sensor. A recording voltmeter 6 is connected to the input terminals of the amplifier 5 operating in the key mode, and with the help of an electromagnetic relay 7, an electric pulse counter 8 and a signal device 9 are turned on.

The device works as follows.

The grounded anode / is in constant contact with the material being monitored. The cathode 4 is installed in the bottom of the chute 10 in the path of the flow of material into the bunker. When flow

is absent, the target of cathode 4 is open, and the control signal is not fed to the input of amplifier 5, transistor 12 is in cut-off mode, and composite transistor 13 is in saturation mode. Cutoff mode is provided

due to the feedback voltage, which is created by the voltage drop across the resistor 14. In this case, the recording voltmeter 6 receives a voltage and is recorded with a polarity corresponding to the power source,

its value is about 1 in.

When wet material flows through the drain 10, a positive pulse of the blocking voltage is applied from the cathode 4 to the base of transistor 12, resulting in an avalanche-like transition to a state characterized by cut-off of transistor 12 and saturation of the composite transistor 13. A current flows through relay 7 and contacts 15, 16 relays 7 include a counter 8 and a signal device 9.

Subject invention

Device to control the upper and lower limit levels of liquid and wet

bulk materials by ed. St. No. 315047, characterized in that, in order to increase the amount of information on the technological parameters of the monitored material, it is equipped with an additional cathode and transistor amplifier connected to it with an electromagnetic output relay, a recording device connected between the additional cathode and the common anode, an electric pulse counter and alarm device connected through the contacts of the relay to the power supply circuit.

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