SU1368646A1 - Two-position level transducer for water tower - Google Patents

Abstract

The invention relates to automation and improves the accuracy of the sensor in the upper limit of the monitored liquid level and reliability. As water enters the tower, its level rises. Since the opening 3 is closed by the membrane 4, the water under the casing comes in part due to the compression of the air under the casing and does not reach the electrode 2. When the water level reaches the upper level, the water pressure on the membrane 4 becomes greater than the pressure from the top of the liquid column 6. The membrane 4 is raised, the hole 3 is opened and the air from under the casing exits through the water into the atmosphere. Under the casing comes water, which, due to its electrical conductivity, closes the circuit between electrodes 1 and 2. The control device shuts off the pump. 1 il.

Description

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The invention relates to automation and can be used as a sensor in a device for adjusting the level of water in water towers of the C-based water supply system.

The purpose of the invention is to increase the accuracy of the sensor in the upper limit of the monitored liquid level and reliability.

The drawing shows schematically the device of the proposed level sensor.

The sensor consists of a cylindrical common electrode 1, which forms an upside-down glass-shaped housing, inside which electrode 2. is placed. In the bottom of the glass-like housing there is an opening 3, which is blocked on the outside by a rubber membrane 4 mounted on the lower end of the steel piezometric tube 5. The tube is filled with antifreeze in winter, liquid 6, which is, for example, transformer oil.

To prevent moisture from entering, the upper end of the tube is covered by a rubber membrane 7. The sensor is installed in the tank 3 of the water tower. The sensor works as follows. When the tank 8 of the water tower is not filled with water, the membrane 4 is pressurized by the liquid column 6 and is pressed against the edges of the hole 3, and the circuit between the electrons 1 and 2 is open, which is perceived by the pump control unit as a signal to turn on the pump (not shown) . As water enters the water tower level

it gradually rises and becomes below the low mark. In this case, since the opening 3 is closed by the membrane 4, the water under the casing comes only partially due to the compression of the air under the casing and reaches far from the electrode 2. The circuit between

and the electrode 1 remains open, the pump continues to operate.

When the water level reaches the upper level, the pressure of the water on the membrane 4 from below becomes slightly higher than the pressure exerted by the liquid column 6. The membrane rises, the opening 3 opens and air from under the casing 1 is released into the atmosphere through water, which, due to its electrical conductivity, closes the circuit between electrodes 1 and 2. The control device shuts off the pump

The water level in the tank of the water tower begins to decrease, the hole 3 is again closed by the membrane, when the level of WATER drops below the level of the lower rego level, the water held under the casing 1 by atmospheric pressure goes out from under the casing. The circuit between the electrodes 1 and 2 is opened, the control device switches on the pump.

Further, the sensor operation occurs cyclically in the described sequence.

Claims (1)

Invention Formula An on / off level sensor for a water tower, containing a 1st rod electrode placed inside an upside down stacked glass case, characterized in that, in order to increase operation accuracy and reliability, a tube filled with antifreeze is inserted in it, in the upper and lower ends of which the sealing membranes, wherein the bottom of the glass-like casing is made with a hole, and the lower sealing membrane is located above the glass-shaped casing and covers the hole in its bottom.