Method and device for system and/or process monitoring

• US 7,070,324 B2
• Filed: 12/01/2001
• Issued: 07/04/2006
• Est. Priority Date: 12/07/2000
• Status: Expired due to Fees

• Current Assignee: Endress+Hauser Flowtec AG (Endress+Hauser AG)
• Original Assignee: Endress+Hauser Flowtec AG (Endress+Hauser AG)
• Inventors: Budmiger, Thomas
• Primary Examiner(s): Gutierrez, Diego
• Assistant Examiner(s): PRUCHNIC, STANLEY J
• Application Number:
  US10/432,634
• Publication Number:
  US 20040037349A1
• Time in Patent Office: 1,676 Days
• Field of Search: 374/54, 374/57, 374/102, 374/107, 374/142, 374/152, 374/147, 374/148, 702/130, 702/132, 702/133, 702/136, 702/183, 702/187, 702/188, 702/65, 324/204, 738/610.8, 738/611.1, 738/611.2, 738/611.3, 738/611.4, 738/611.5, 340/588, 340/589
• US Class Current: 374/57
• CPC Class Codes: G01F 1/58 by electromagnetic flowmeters
• CPC Class Codes: G05B 23/0283 Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06

Abstract

The invention relates to a method and to a device for system- and/or process-monitoring in connection with a measurement apparatus that determines/monitors at least one process parameter of a medium. The method and device enable statements to be made regarding the present and future functionality of a measurement apparatus, or individual components of the measurement apparatus. The temperature values (T) of the medium are ascertained directly or indirectly and a trend analysis regarding the thermal loading of the measurement apparatus or the thermal loading of individual components of the measurement apparatus is carried out on the basis of the ascertained temperature values (T) of the medium or on the basis of the derivatives of the ascertained temperature values of the medium.

Claims

1. In combination, a flow measurement apparatus and a thermal load monitoring device, the combination comprising:

a measurement tube defining a longitudinal axis, a flowing medium flowing through said measurement tube in the direction of said longitudinal axis;

a magnet component containing two electromagnets and at least one measurement electrode, wherein said electromagnets are arranged in relation to said measurement tube to produce a magnetic field passing through said measurement tube, said magnetic field oriented essentially crosswise to said longitudinal axis and wherein said at least one measurement electrode is arranged in a lateral region of said measurement tube and is galvanically or capacitively coupled with the flowing medium so that a measurement voltage is induced in said at least one measurement electrode in response to said flow of the flowing medium through the measurement tube

a temperature sensor for sensing a temperature of said flowing medium and configured to provide a temperature value indicative of said temperature of said flowing medium;

an evaluation/control unit;

said evaluation/control unit configured to receive said induced measurement voltage from said at least one measurement electrode and to determine information about the flow of the flowing medium in said measurement tube from said induced measurement voltage and

said evaluation/control unit configured to receive said temperature value from said temperature sensor and to perform a trend analysis of received temperature values to provide information about a thermal loading of said flow measurement apparatus based on said temperature values received over an extended time.

2. The combination as claimed in claim 1, wherein said temperature sensor is arranged such that it comes in contact with the flowing medium or said temperature sensor is arranged such that it is in immediate proximity to the flowing medium.

3. The combination as claimed in claim 1, wherein said evaluation/control unit uses said information about the thermal loading of said flow measurement apparatus for making a statement regarding the life span of said flow measurement apparatus or regarding the life span of individual components of said flow measurement apparatus.

4. The combination as claimed in claim 1, wherein said evaluation/control unit monitors the resistance of at least one electromagnet of said two electromagnets over an extended time, determines the temperature or the temperature change of said at least one electromagnet therefrom and uses the thus established temperature values of said at least one electromagnet for said trend analysis regarding the thermal loading of said flow measurement apparatus or regarding the thermal loading of individual components of said flow measurement apparatus.

5. The combination as claimed in claim 4, further comprising a storage unit, in which the resistance values of said at least one electromagnet of said two electromagnets are stored as a function of temperature.

6. The combination as claimed in claim 5, wherein characteristic curves are filed in said storage unit, which relate the resistance of said at least one electromagnet of said two electromagnets or resistance changes of said at least one electromagnet to the temperature or, respectively, temperature changes of said flow measurement apparatus.

7. The combination as claimed in claim 5, wherein characteristic curves are stored in said storage unit, which provide a relationship between the temperature of said at least one electromagnet of said two electromagnets or of said flow measurement apparatus and the probable life span of said flow measurement apparatus.

8. The combination as claimed in claim 7, wherein the characteristic curves are empirically established characteristic curves.

9. The combination as claimed in claim 7, further comprising an output/display unit, by way of which information on the probable life span of said flow measurement apparatus or of individual components of said flow measurement apparatus is made available to operating personnel.