Pressure gauge

• US 8,020,450 B2
• Filed: 07/16/2009
• Issued: 09/20/2011
• Est. Priority Date: 07/18/2008
• Status: Active Grant

• Current Assignee: Wika Alexander Wiegand GmbH & Co. KG (WIKA Alexander Wiegand SE & Company KG)
• Original Assignee: Wika Alexander Wiegand GmbH & Co. KG (WIKA Alexander Wiegand SE & Company KG)
• Inventors: Landwehr, Horst, Glaab, Holger
• Primary Examiner(s): Allen; Andre J
• Application Number:
  US12/504,247
• Publication Number:
  US 20100011870A1
• Time in Patent Office: 796 Days
• Field of Search: None
• US Class Current: 73/740
• CPC Class Codes: G01L 19/14 Housings G01L19/0007, G01L19/0084, G01L19/0092, G01L19/04, G01L19/06 take precedence

Abstract

The invention relates to a pressure gauge having a cylindrical housing to which a bushing is fixed, which penetrates the housing. The pressure gauge is furthermore provided with a pressure sensor together with an allocated electronic evaluation unit, said sensor is operatively connected to a pressure port coaxially positioned to the longitudinal axis of the housing. A turnable adjustment pin to engage with an adjustment device of the electronic evaluation unit in the pressure gauge is accommodated in the bushing in a liquid-proof manner, and is equipped with holding means by means of which it is undetachably secured to the bushing.

Claims

1. A pressure gauge, comprising:

a cylindrical housing to which a bushing, which penetrates the housing, is fixed;

a pressure sensor having an allocated electronic evaluation unit, and which is operatively connected to a pressure port being positioned coaxially to the longitudinal cylinder axis of the housing; and

a turnable adjustment pin to engage with an adjustment device of the electronic evaluation unit in the measuring gauge,

wherein the adjustment pin is accommodated, in a liquid-tight manner, inside the bushing and includes a holding means for undetachably fixing the adjustment pin to the bushing.

2. A pressure gauge according to claim 1, wherein the holding means is a latching means to positively secure the adjustment pin inside the bushing.

3. A pressure gauge according to claim 2, wherein the latching means includes at least one latching element at one end of the adjustment pin that grips behind a shoulder at one end of the bushing.

4. A pressure gauge according to claim 1, wherein a sealing element is provided between the adjustment pin and the bushing.

5. A pressure gauge according to claim 4, wherein the sealing element is an O-ring.

6. A pressure gauge according to claim 1, wherein the adjustment pin is inserted into the bushing from the outside.

7. A pressure gauge according to claim 1, wherein the bushing is welded to the housing.

8. A pressure gauge according to claim 1, wherein the adjustment pin is provided with a tool receiver at one end which is positioned towards the outside of the housing.

9. A pressure gauge according to claim 1, wherein the adjustment pin is provided with a coupling element to engage the adjustment device at one end which is positioned towards the inside of the pressure gauge.

10. A pressure gauge according to claim 1, wherein the adjustment device of the electronic evaluation unit is a potentiometer.

11. A pressure gauge according to claim 1, wherein a liquid-tight, gas permeable device is provided at the bushing to enable a pressure compensation between the inside of the housing and the environment.

12. A pressure gauge according to claim 1, wherein the bushing is positioned in the cylindrical housing at right angles to the longitudinal axis of the cylinder.

13. A pressure gauge according to claim 1, wherein the bushing is positioned in the cylindrical housing in parallel with the longitudinal axis of the cylinder.

14. A pressure gauge according to claim 1, wherein the adjustment pin is substantially aligned with the outside wall of the housing in an axial direction of the bushing.

15. A pressure gauge according to claim 14, wherein the adjustment pin is covered by a sticker.

16. A pressure gauge according to claim 1, wherein the housing is connected to the pressure port by welding.