DE3032754A1 - Temp. sensor with large heat exchanger surface - has block-shaped base with surface of high thermal conductivity and element stuck in hole - Google Patents

Abstract

The temperature sensor is arranged with a large heat transfer surface of the conducting cable (1) and the support base. It obviates the need for any welding processes. It is used to measure temperature differences when computing the amount of heat consumed in a system. The support base is in the form of a block with four surfaces made from a material with a good thermal conductivity. The temperature measuring element (3) is inserted in a hole in the block (2) and stuck with a temperature resistant adhesive containing copper. The adhesive is in the form of a paste.

Description

Temperature sensor for

the heat metering The present invention relates to temperature application sensors according to the preamble of claim 1.

Temperature sensors can be used for temperature difference measurements in the counting of heat quantities, as used in business traffic can be used particularly economically.

The temperature sensors are attached to the transport line from the outside (1) of the heat transfer medium installed. This does not involve any of the usual welding work required, there is no interruption of the heat transfer medium flow during assembly necessary. Strap-on sensors provide measured values proportional to the medium temperature.

The previously known and used temperature contact sensors have the main disadvantage that they are both in new condition, that is the moment the assembly, as well as the temperature over the long term over the duration of their use of the heat transfer medium cannot be reproduced correctly. Usually one is too big negative display of the true temperature to be expected, leading to an excess which leads to calibration error limits. Another disadvantage lies in the very large thermal Inertia of the known temperature contact sensors. Therefore, so far from the Physikalisch-Technische Bundesanstalt für temperature contact sensors no type approval been pronounced.

According to the invention, the measurement task posed by the disadvantages is carried out solved the temperature sensor characterized in claim 1 (Fig. 1).

There is once the heat transfer between the heat transfer fluid and the temperature measuring element (3) by large-area adaptation and choice of good heat-conducting Materials are improved and, on the other hand, thermal radiation is generated by the temperature sensor and thus avoiding thermal insulation surrounding the temperature measuring element (3).

This ensures that the temperature-proportional measurement signal of the temperature measuring element (3) of the true temperature of the heat carrier more precisely and faster follows. By complying with the legal calibration error limits, one lies No longer used in business transactions in connection with heat meters in the way.

An embodiment of the invention described is shown in the figure 1 and is explained in more detail below.

The one made of a material that conducts heat well (e.g. copper) The mounting block (2) has a hole to accommodate the temperature measuring element (3) (e.g. Pt 100 resistance temperature measuring element according to DIN 43760). For the purpose the temperature tower measuring element (3) is with a copper-containing one for better heat transfer Glue stuck into the mounting hole. The ones running parallel to the center line four surfaces with radii are the most common pipe diameters or other pipe diameters provided (5). An electrical line provided with temperature-resistant insulation (6) is held in a strain relief part (7) and provides the electrical connection for the heat meter.

With a pipe clamp (8) made of stainless material the mounting block (2) clamped onto the transport line (1).

The contact surfaces have previously been made rust-free and also color-free and provided with a copper-containing and temperature-resistant paste.

An insulation made of thermally conductive material (e.g. rock wool) (4) is placed around the temperature sensor and the transport line and then sealed.

Claims (4)

Claims 1 temperature sensor with large area adaptation the heat transfer surfaces of the transport line (1) and that of the mounting block (2) characterized in that the four surfaces of the material with good thermal conductivity existing mounting block (2) with the radii of freely selectable heating medium transport lines are provided. 2. Temperature sensor according to claim 1, characterized in that that the temperature measuring element (3) in the bore of the receiving block (2) with a copper-containing, temperature-resistant adhesive is glued. 3. Temperature sensor according to claim 1, characterized in that that the surfaces of the heat carrier transport line provided for mutual contact (1) and the mounting block (2) with a copper-containing, temperature-resistant Paste can be provided. 4. temperature sensor according to claim 1, characterized in that the temperature sensor is surrounded by a heat-insulating insulation (4).