Method for weighing apparatus calibration management

• US 7,441,436 B2
• Filed: 03/14/2006
• Issued: 10/28/2008
• Est. Priority Date: 09/27/2005
• Status: Active Grant

• Current Assignee: Mettler-Toledo LLC (Mettler-Toledo International Inc.)
• Original Assignee: Mettler-Toledo Incorporated (Mettler-Toledo International Inc.)
• Inventors: Moorman, John, Simmons, Venus, Bliss, Doug
• Primary Examiner(s): NOLAND, THOMAS
• Application Number:
  US11/374,673
• Publication Number:
  US 20070073505A1
• Time in Patent Office: 959 Days
• Field of Search: 73/11.3, 702/101, 177/25.13, 177/50
• US Class Current: 73/1.13
• CPC Class Codes: G01G 23/01 Testing or calibrating of weighing apparatus

Abstract

A weighing apparatus calibration method uses a test mass, a material and a terminal to calculate and compare the total weight of the test mass and material to determine if the total capacity of the weighing apparatus has been calibrated. A system for managing calibration of a weighing apparatus is also described.

Claims

1. A method for automatically re-calibrating a weighing apparatus as needed, said weighing apparatus having a predetermined total weighing capacity and being electronically connected to a terminal having a display, a keyboard, a calibration management module, a calibration test module and a calibration module, said method comprising the steps of:

using said calibration management module to monitor one or more various limits associated with said weighing apparatus;

producing an event when said one or more limits has been exceeded;

performing a calibration test using said calibration test module upon the occurrence of said event;

as determined by said calibration test, producing a second event indicating that re-calibration of said weighing apparatus is necessary;

employing said calibration module to re-calibrate said weighing apparatus using a step calibration method comprising the steps of;

(a) placing a test mass having a known weight and a material having substantially the same weight as said test mass on said weighing apparatus,

(b) calculating a total weight on said weighing apparatus with said terminal,

(c) calibrating said weighing apparatus to said total weight with said terminal,

(d) comparing said total weight to said predetermined total weighing capacity of said weighing apparatus with said terminal, and

(e) removing said test mass from said weighing apparatus.

2. The method of claim 1 further comprising:

prior to step (a);

placing a test mass having a known weight on said weighing apparatus;

entering said known weight of said test mass into said terminal using said keyboard;

calibrating said weighing apparatus to said known weight of said test mass with said terminal; and

removing said test mass from said weighing apparatus.

3. The method of claim 2 further comprising:

(f) repeating steps (a) through (e) until said weighing apparatus is calibrated substantially to said total weighing capacity.

4. The method of claim 1 further comprising:

(f) repeating steps (a) through (e) until said weighing apparatus is calibrated substantially to said total weighing capacity.

5. The method of claim 1 further comprising:

while said material having substantially the same weight as said test mass is being placed on said weighing apparatus, continually displaying on said display of said terminal the weight of said material.

6. The method of claim 5 wherein said material is at least one material selected from the group consisting of a liquid material and a granular material.

7. The method of claim 1 wherein said method is performed after a predetermined limit has been reached and said predetermined limit is at least one limit selected from the group consisting of a time limit, a weighment limit, an overload limit and a zero request limit.

8. The method of claim 1 wherein said method is performed after replacement of a portion of said weighing apparatus.

9. The method of claim 1 further comprising:

storing said known weight and said total weight in a memory storage device of said terminal.