DE9215259U1 - Temperature sensor - Google Patents

Description

Research Institute Prof.Dr.-Ing.habil.,

Dr.phil.nat. Karl Otto Lehmann, successor

GmbH & Cie.

Leisbergstrasse 21 ANR: 1250 825

7570 Baden-Baden Our reference: FI 92/1

Temperature sensor

The invention relates to a temperature sensor with a thermoelectric measuring element with connection means in a housing.

In process measurement technology, there is often a requirement for a versatile and easy-to-connect temperature sensor with small dimensions.

This requirement is met by a temperature sensor having the features of claim 1.

The heat flow that represents the ambient temperature is fed to the thermally insulated measuring element, e.g. a temperature measuring resistor, that is arranged in the housing via the flag-like sections of the heat conducting plates that protrude freely from the housing. The electrical measuring signal generated there can be taken from the connection pins for further processing.

The temperature sensor according to the invention is preferably used to determine the reference junction temperature when measuring thermal process variables.

In a known manner, the difference between the temperature signal measured in the process and the signal corresponding to the reference junction temperature corresponding to the actual temperature is formed in the reference junction.

A particular advantage of the temperature sensor of the claimed design is that it can be inserted into the terminals of commercially available terminal blocks in such a way that the flag-like end sections of its heat conducting plates are in direct thermal contact with the incoming compensation lines of the temperature

temperature sensor in the process and the lines leading to further signal processing.

The temperature sensor according to the invention can also be used independently, whereby the parts of the heat conducting plates protruding from the housing are directly exposed to a temperature to be measured in a gas, liquid or solid.

To explain the invention, an embodiment is shown in Figures 1 to 4 and described below: The same reference numerals apply to the same parts.

Show it

Fig. 1 a side view of the temperature sensor

Fig. 2 a cross section A-B

Fig. 3 a view from above without the upper housing part

Fig. 4 View of the upper housing part

A housing 1 made of thermally and electrically insulating material, consisting of a lid-like upper part 1.2 and lower part 1.1, contains a thermoelectric measuring element, e.g. a temperature measuring resistor Pt 100. The measuring element 2 is electrically connected to two connecting pins 3 guided through the lower part 1.1 and secured therein and inserted between two overlapping end sections 4.1 and 5.1 of two heat conducting plates 4 and 5. The other end sections 4.2 and 5.2 of the heat conducting plates 4 and 5 are designed like flags and protrude from the housing 1 and are bent downwards so that they run parallel to the connecting pins 3.

The upper part 1.2 of the housing 1 can be provided with a surface 1.3 for the attachment of identifying symbols (Fig. 4).

In Fig. 1, the arrangement of the temperature sensor in a terminal block 6 (shown in dashed lines) is indicated.

The terminal block 6 has at least four terminal points 7.1 to 7.4 in a row. The inner terminal points 7.2 and 7.3 serve to accommodate the connection pins 3, the correspondingly designed, flag-like end sections 4.2 and 5.2 of the heat conducting plates 4 and 5 are inserted into the outer terminal points 7.1 and 7.4 and clamped together with the connection ends of the compensation lines 8 of a thermal sensor in the process (not shown). The connections in the terminal block 6 for the outgoing lines are designated with 9.

Claims (6)

Protection claims 1) Temperature sensor with a thermoelectric measuring element in a housing with connection means, characterized in that - the housing (1) consists of a lower part (1.1) and a lid-like upper part (1.2), - two connecting pins (3) are guided through the bottom surface of the lower part (1.1) and fixed therein, - the measuring element (2) is connected to the inner ends of the connection pins (3) of the housing, - two heat conducting plates (4, 5) are arranged in the housing (1), one end section (4.1, 5.1) of which encloses the measuring element (2) in a heat-conducting manner and whose other, flag-like end sections (4.2, 5.2) are led out of the housing (1). 2) Temperature sensor according to claim 1
characterized in that the flag-shaped end sections (4.2, 5.2) of the heat conducting plates (4,5) are led out of the housing (1) parallel to the connection pins (3). 3) Temperature sensor according to claim 1
characterized in that the flag-shaped end sections (4.2, 5.2) of the heat conducting plates (4,5) lie in the same plane as the connection pins (3). 4) Temperature sensor according to claim 3 and/or 4 for detecting the temperature at the terminal points of a terminal block having at least four connections, characterized in that the flag-like end sections (4.2, 5.2) of the heat conducting plates (4,5) are dimensioned such that they can be inserted into the clamping points (7.1, 7.4) of the terminal block (6). 5) Temperature sensor according to claim 1
characterized in that the housing (1) is made of thermally and electrically insulating material. 6) Temperature sensor according to claim 1
characterized in that the upper part (1.1) of the housing (1) has a surface (1.3) suitable for receiving identifying symbols.