Level transmitter
AssigneeVEGA Grieshaber KG
InventorsJosef Fehrenbach, Karl Griessbaum
Life of this patent
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Abstract
A level transmitter for use in a process application measures the height of a product level in a container, e.g., in a tank. The level transmitter includes an electromagnetic wave antenna directed into the tank. An electromagnetic wave source sends an electromagnetic wave signal through the electromagnetic wave antenna. An electromagnetic wave receiver receives the reflected electromagnetic wave signal. Measurement circuitry coupled to the source and receiver initiates transmitting of the electromagnetic wave signal and determines product level height based upon the received, reflected signal. Output circuitry transmits information related to product height. The device is suitable for use with containers having very small orifices for antenna insertion.
Claims17
A level transmitting device using electromagnetic waves for measuring the height of a product in a container having an orifice therein having an area substantially less than the surface area of the product in the container, the device comprising:
- a microwave source creating electromagnetic waves with a frequency of at least about 24 GHZ mounted at the orifice with threading of the microwave source constructed and arranged for engaging matching threading of the orifice;
- a microwave horn antenna operatively coupled to the microwave source and mounted at the orifice in the container for sending the electromagnetic waves into the container and for receiving a reflected electromagnetic wave from the container, the orifice having a diameter of less than 4 inches;
- a microwave receiver operatively coupled to the antenna for receiving a reflected electromagnetic wave from surface of the product within the container and transmitting an output signal indicative of the level of the product in the container.
A level transmitting device using electromagnetic waves for measuring the height of a product in a container having an orifice therein having an area substantially less than the surface area of the product in the container, the device comprising:
- a microwave source creating electromagnetic waves with a frequency of at least about 24 GHZ mounted at the orifice with threading of the microwave source constructed and arranged for engaging matching threading of the orifice;
- a microwave microstrip antenna operatively coupled to the microwave source and mounted at the orifice in the container for sending the electromagnetic waves into the container and for receiving a reflected electromagnetic wave from the container, the orifice having a diameter of less than 4 inches;
- a microwave receiver operatively coupled to the antenna for receiving a reflected electromagnetic wave from surface of the product within the container and transmitting an output signal indicative of the level of the product in the container.
Dependencies are inferred from the claim text.