Temperature sensor and method for its manufacture

• US 8,935,843 B2
• Filed: 07/09/2012
• Issued: 01/20/2015
• Est. Priority Date: 03/20/2008
• Status: Active Grant

• Current Assignee: Endress+Hauser Flowtec AG (Endress+Hauser AG)
• Original Assignee: Endress+Hauser Flowtec AG (Endress+Hauser AG)
• Inventors: Boguhn, Dirk, Holoubek, Jiri, Pfau, Axel, Polak, Jiri, Popp, Oliver
• Primary Examiner(s): Bryant, David
• Assistant Examiner(s): YOO, JUN S
• Application Number:
  US13/444,258
• Publication Number:
  US 20120266451A1
• Time in Patent Office: 925 Days
• Field of Search: 295/21, 295/921, 374/141, 374/185, 374/208, 170/12, 170/204.11, 170/204.22, 170/204.25, 170/204.26, 170/866.5, 702/47, 338/18, 338/25, 338/28, 136/201, 136/232, 137/230
• US Class Current: 29/521
• CPC Class Codes: G01F 1/684 Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
• CPC Class Codes: G01F 1/69 of resistive type
• CPC Class Codes: Y10T 29/49002 Electrical device making
• CPC Class Codes: Y10T 29/49826 Assembling or joining
• CPC Class Codes: Y10T 29/49936 Surface interlocking

Abstract

A thermal, flow measuring device for determining and/or monitoring the flow of a measured medium through a measuring tube. The thermal, flow measuring device includes: a first pin-shaped shell and at least a second pin-shaped shell; a first resistance thermometer and at least a second resistance thermometer. At least the first resistance thermometer is embodied so as to be heatable, wherein the resistance thermometers, in each case, have a first surface, and at least a second surface, which lies opposite the first surface. The first pin-shaped shell surrounds the first resistance thermometer, and the second pin-shaped shell surrounds the second resistance thermometer. The pin-shaped shells are fillable with a fill material. In each case, at least one spacer is placeable between the pin-shaped shell and the first surface of the resistance thermometer, and the second surface of the resistance thermometer is at least partially covered with fill material.

Claims

1. A method for manufacture of a temperature sensor, wherein the sensor includes:

at least one tubular, pin-shaped shell having a first open end and a second end, wherein the first open end of the pin-shaped shell is held in a sensor holder and the second end of the pin-shaped shell contacts in an operating state the measured medium; and

at least one resistance thermometer having a first surface and at least a second surface, which lies opposite the first surface,

the method comprising the steps of;

providing the second end of the pin-shaped shell to be open;

securing a spacer with a resistance thermometer onto the first surface;

inserting the spacer into the pin-shaped shell through the second open end of the pin-shaped shell; and

closing the second open end of the pin-shaped shell with a plug.

2. The method for manufacture of a temperature sensor as claimed in claim 1, wherein:

in case of a closed second end of the pin-shaped shell, fill material is filled in through the first end of the pin-shaped shell, and the second surface of the resistance thermometer is at least partially covered.

3. The method for manufacture of a temperature sensor as claimed in claim 1, further comprising the step of:

connecting the spacer with the plug in a material-bonding manner.

4. The method for manufacture of a temperature sensor as claimed in claim 1, further comprising the step of:

pushing the spacer into the pin-shaped shell during introduction of the plug.

5. The method for manufacture of a temperature sensor as claimed in claim 1, wherein:

the pin shaped shell and the plug form a closed housing.

6. The method for manufacture of a temperature sensor as claimed in claim 1, wherein:

a free space in the pin shaped shell is filled or potted with a suitable fill material.

7. The method for manufacture of a temperature sensor as claimed in claim 1, wherein:

the resistance thermometer is not in direct contact with the measuring medium.

8. A method for the manufacture of a thermal, flow measuring device, comprising the steps of:

providing a temperature sensor which includes;

at least one tubular, pin-shaped shell having a first open end and a second end, wherein the first open end of the pin-shaped shell is held in a sensor holder and the second end of the pin-shaped shell contacts in an operating state the measured medium; and

at least one resistance thermometer having a first surface and at least a second surface, which lies opposite the first surface;

providing the second end of the pin-shaped shell to be open;

securing a spacer with a resistance thermometer onto the first surface;

inserting the spacer into the pin-shaped shell through the second open end of the pin-shaped shell; and

closing the second open end of the pin-shaped shell with a plug.