Gas measurement sensor, especially for determining oxygen concen

Details Gas measurement sensor, especially for determining oxygen concen Gas measurement sensor, especially for determining oxygen concen

1992-06-24

1993-09-21

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, 204428, G01N 2726

Patent

active

052465624

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a gas measurement sensor. In the gas measurement sensor in accordance with the species known from EP 0 087 626 B1 (FIGS. 4 to 6), corresponding to Bayha and Weyl/Bosch U.S. Pat. No. 4,818,363, its elongated planar sensor element has thin contact surfaces made of a platinum metal in its section on the connecting side; when this section on the connecting side of the sensor element is inserted into the connector plug on the connecting side, which presses with metallic spring elements, which are mechanically pre-stressed and are used as opposite contacts, on the contact surfaces of the sensor element or of a possible layered heating element, these contact surfaces can be damaged and false indications or false control actions can be caused because of these damages. If such contact surfaces of sensor elements or spring elements of the connector plug are provided with a thin, corrosion-resistant coating (for example of gold), these contact surfaces and coatings can already be damaged or destroyed when the sensor element and connector plug are plugged together and thus can impair the perfect function of the gas measurement sensor.


Advantages of the Invention

In contrast thereto the gas measurement sensor in accordance with the present invention has the advantage that in the course of the assembly of the sensor element and the connector plug on the connecting side, neither the contact surfaces of the sensor element nor possible corrosion-resistant coatings on the contact elements are damaged and that therefore impairment of the gas measurement sensor in this section is prevented to the greatest extent.
A further advantage is seen in that the individual elements involved in the contact operations of the connector plug on the connecting side with the planar sensor element can be easily produced and assembled.
Advantageous further embodiments and improvements of the gas measurement sensor recited in the main claim are possible by means of the steps recited in the dependent claims; this is particularly applicable for connector plugs of such gas measurement sensors which have, on at least one of the two large areas of the sensor, contact surfaces of sufficiently large size and where the distances between the contact surfaces of the sensor and between the contact elements of the connector plug are still sufficiently large and thus assured.


BRIEF DESCRIPTION OF THE DRAWINGS

An exemplary embodiment of the invention is illustrated in the drawings and explained in detail in the description below.
Shown are in FIG. 1 a longitudinal section through a gas measurement sensor of the invention shown in an enlargement,
FIG. 2 an enlarged top view of a large area containing two contact surfaces of an end section on the connecting side of an elongated, planar sensor,
FIG. 3 an enlarged view in the direction A/B (turned by 90 degrees) of the connector plug contained in the gas measurement sensor of FIG. 1,
FIG. 4 a view of a contact element support in the direction towards the connecting side of the connector plug in accordance with FIG. 3,
FIG. 5 a top view on the back, pointing away from the sensor, of the contact element support in accordance with FIG. 4,
FIG. 6 an enlarged top view of a large area containing three contact surfaces of a sensor for the connector plug in accordance with FIG. 7,
FIG. 7 an enlarged longitudinal section through a connector plug which is provided for planar sensors with up to three contact surfaces per large side (see section line VII--VII in FIG. 9),
FIG. 8 an enlarged top view of the front side, provided with contact elements, of a contact element support (or an opposite wall) of the connector plug in accordance with FIG. 7,
and FIG. 9 a cross section through the connector plug along the line IX--IX of FIG. 7.


DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

The gas measurement sensor 10 shown in FIG. 1 has a pipe-shaped metal housing 11 which has on its exterior a hexagonal wrench fitting 12 and a screw thread 13 as means for installing the gas me

REFERENCES:
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patent: 4187163 (1980-02-01), Steinke et al.
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patent: 4588494 (1986-05-01), Kato et al.
patent: 4732663 (1988-03-01), Kato et al.
patent: 4786399 (1988-11-01), Wertheimer et al.
patent: 4818363 (1989-04-01), Bayha et al.

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