The level switch liquid level

 

(57) Abstract:

The inventive device includes a float, a lever, a tube, a fiber, a source of light radiation, a photodetector, the recording device. The lever and a support pivotally connected and installed in the tank. The float and the tube attached to the opposite ends of the lever. The tube is bent at an angle not less than 90 , hermetically closed at both ends and partially filled with liquid, and from the side of one of the ends it entered the light guide is made by bending. 1 Il.

The invention relates to measurement techniques, in particular to the measurement of liquid or bulk materials mainly in conditions of increased fire and explosion hazard.

Known float gauges with simple design (see, for example, and. C. N 1155865, 1186952, 1262291, 1283538, 1314231, 1428933), containing, along with the float, liquid level locking, a device that converts information about the position of the float in the signal that can be transmitted by one or another line on the recording device. As this usually use an electric communication line, the specified level there are limitations to their use in tanks with Legkov them to the claimed invention provide a technical solution. C. N 427237, CL G 01 F 23/22, 1972, contains a source of light radiation, an optical fiber, a photodetector connected to a recording device.

The downside of it is the presence of the detector prototype electric circuits, which requires additional measures on protection against fire and explosion in case of use in an explosive atmosphere (for example, to control the level of flammable liquids).

The aim of the invention is the provision of fire and explosion, while maintaining the simplicity of the device.

The goal is achieved that the device was introduced pivotally connected to the lever and bearing made with the possibility of installation in the tank and bent at an angle of at least 90abouttube and float attached to opposite ends of the lever. The tube is sealed at both ends and partially filled with liquid and with one end of the tube entered the light guide is made by bending and in contact with the emitter. The second end of the optical fiber through the same end of the tube is connected optically with a photodetector, an electrical signal which is fed to the recording device.

To ensure robotos azatel refractive liquid;

nsis the refractive index of the optical fiber.

The figure schematically depicts a level switch, which presents the float 1, mounted on one arm of the lever 2 pivotally linked through the axis 3 with fixed bearing 4.

On the second arm 5 of the lever 2 reinforced tube 6, is bent at an angle of 90about, sealed at both ends and partially filled with the liquid 7.

With the end more distant from the axis 3, the tube entered the optical fiber 8, is optically conjugate with the radiator 9, which is inside the tube forms a sharp bend 10, and then the fiber 11 is derived from the tube and is in optical contact with the photodetector 12, the electrical signal from which is fed to the recording device 13.

The operation of the detector is that at the top level of the liquid lever 2 is in the horizontal position and the liquid 7 wets sharp bend 10 of the optical fiber 8. As a consequence, the radiation from the source 11 is incident on the photodetector 12, which does not produce a corresponding electrical signal which should be received at the recording device 13, which is recorded as reaching the top level.

By reducing the BKE and frees sharp bend 10.

Once in the air, sharp bend 10 transmits radiation emitter 9 on the photodetector 12, which produces an electrical signal. The latter is fed to the recording device 13 and is perceived as lowering the liquid level below the specified level.

(56) USSR Author's certificate N 427237, CL G 01 F 23/22, 1972.

1. The LEVEL switch LIQUID containing a source of light radiation, connected via fiber with a photodetector connected to a recording device, characterized in that it introduced pivotally connected to the lever and bearing made with the possibility of installation in the tank, the float and bent at an angle of at least 90othe tube is attached to the opposite ends of the lever, and the tube is sealed at both ends and partially filled with liquid, and from the side of one of the ends of the tube entered the light guide is made with a bend.

2. The detector under item 1, characterized in that the refractive index of the liquid in the tube is less than the refractive index of the light guide.

 

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