Balance comprising a housing with an excess pressure
AssigneeMettler-Toledo AG
InventorHans Rudolf Burkhard
Life of this patent
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Abstract
An electronic balance with a housing (1) that can be put under an above-ambient pressure, for example for the purpose of using the balance in a hazardous environment where a risk of explosion exists, has an inlet (21) for a gas, in particular compressed air. The balance also has a horizontal passage through the housing (1) for a force-transmitting rod member (6) that is coupled to the load-hanger element (12) of the balance. The housing (1) has an opening (9) through which the force-transmitting rod member (6) passes in a substantially horizontal direction without making contact; and the opening (9) also forms an outlet for the gas.
Claims11
Electronic balance with a housing (1) that can be put under an above-ambient pressure, particularly for use in an environment where a risk of explosion exists, with at least one inlet for a protective gas, in particular compressed air, with a force-transmitting rod member (6) passing through the housing wall, and further with at least one substantially horizontal passage through the housing wall for the force-transmitting member (6), characterized in that the substantially horizontal passage is realized in a contact-free manner through at least one opening (9) in the housing wall and that the horizontal passage forms an outlet for the protective gas.
Electronic balance according to one of the preceding claims, further characterized in that a pressure sensor (5) is provided to measure the above-ambient pressure in the interior space inside the housing (1) or in the supply conduit (16) for the protective gas and to regulate the above-ambient pressure to a predefined level by means of a valve (15) and an electronic regulating unit (14) that is connected to the valve.
Dependencies are inferred from the claim text.