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Weighing scales operating method and device

A balance and protection device technology, applied in the field of operating balances, can solve problems such as undesired fans

Active Publication Date: 2007-09-05
METTLER TOLEDO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007]The device just described has disadvantages: on the one hand the fan can generate an undesired air flow, on the other hand there is always a fixed amount of ionic charge available for neutralizing static electricity Charge, independent of the magnitude of the electrostatic charge accumulated by the load on the weighing pan

Method used

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  • Weighing scales operating method and device
  • Weighing scales operating method and device
  • Weighing scales operating method and device

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Embodiment Construction

[0045] FIG. 1 shows a balance 1 in a three-dimensional perspective view. The balance 1 has a draft protection device 2 which closes a weighing chamber 3 in which a weighing pan 4 is placed. The weighing pan 4 is connected in a conventional manner to the weighing cell, which is arranged inside the housing 7 of the balance 1 so as to be hidden from view, by means of a rod passing through the floor 30 of the weighing chamber (likewise not visible here) implementation. A container 5 containing a substance 6 to be weighed is placed on the weighing pan 4 . The container 5 is made of a polymeric material, such as polyethylene or polypropylene, and the substance 6 can be, for example, a powder that needs to be weighed in a certain amount before use in a laboratory. Due to the electrical insulation of the container 5 and the weighing substance 6 , both are able to collect electrostatic charges, with the result that an electrostatic force is exerted on the weighing pan 4 which is adde...

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Abstract

A balance ( 1, 101 ) has a weighing pan ( 4, 104 ) for receiving a load ( 5, 6, 25 ) to be weighed, and an electronic weighing module ( 27 ) which includes a measuring unit ( 28 ). The balance is equipped with an electrostatic sensor ( 10 ) which is arranged so that accumulated electrostatic charges which reside on the load can be detected as the load is placed or about to be placed on the weighing pan. The balance is operated by using the electrostatic sensor to detect electrostatic charges, transferring information on a value characterizing the magnitude of the detected electrostatic charges to the measuring unit, comparing the value against a threshold value, and triggering an action of the electronic weighing module based on the comparison.

Description

technical field [0001] The invention relates to a method of operating a balance and also to a balance capable of implementing the method. Background technique [0002] In the accurate weighing of items, it is required that all factors affecting the weighing results should be minimized as much as possible. For example, in many cases air movements can be reduced by means of draft guards to the extent that they become negligible, or fluctuations in ambient conditions such as temperature, humidity can be achieved for example by placing the balance in a climate-controlled room to eliminate. [0003] As another factor that also affects the weighing result, especially when weighing non-conductive samples or when weighing samples packed in non-conductive materials, the The electrostatic charge manifests itself. The effect of electrostatic charges becomes problematic especially when large polymeric or glass containers are used in weighing processes where the purpose is to detect s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01G7/02G01G7/06
CPCG01G21/286G01G23/00
Inventor 布鲁诺·纽弗阿瑟·赖克马特
Owner METTLER TOLEDO INC
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