DE202009012292U1 - Temperature sensor with test channel - Google Patents

Abstract

Built-in temperature sensor (1) for gaseous and liquid media with a process connection (5) for installation in pipes or containers, a connection head (3) for receiving electrical connection elements, at least one temperature sensor (8), a protective tube (2) and a test channel for temporary Receiving a control temperature sensor, wherein in the protective tube (2) at least one sewer pipe (6) is arranged, which forms the test channel, wherein the protective tube (2) of the process connection (5) is arranged and wherein at a lower end of the protective tube (2) Bottom (2.2) is arranged gas-tight, characterized in that the sewer pipe (6) arranged eccentrically in the protective tube (2) and is formed with a wall thickness of not more than 0.2 mm that a side wall (6.1) of the sewer pipe (6) with a Side wall (2.1) of the protective tube (2) and / or a bottom (6.2) of the sewer pipe (6) to the bottom (2.2) of the protective tube (2) are thermally coupled at least partially thermally, wob ei the bottom (2.2) of the protective tube (2) forms the bottom (6.2) of the sewer pipe (6) and that the ...

Description

The The invention relates to a built-in temperature sensor according to the Features of the preamble of claim 1. The invention relates Furthermore, a built - in temperature sensor according to the features of Preamble of claim 7.

To Measuring, testing and monitoring purposes are regular the reliable detection of temperatures of in line guided gaseous and liquid media required. For this purpose, temperature sensors are arranged at certain points of the line. To comply with existing procedural rules is the frequent inspection of these measuring points required.

It Various temperature sensors are known in which the Temperature sensor with the help of an additional second sensor are checked in the installed state can. In Irrgang / Michalowsky: "Temperaturmesspraxis with Resistance thermometers and thermocouples "are process-controllable thermometers described that contain a test channel. The well-known Versions have protective tubes with larger Diameter in which a free inner channel is arranged centrally. The test channel leads through the connection socket through into the protective tube and then from the top with a control thermometer be fitted. It is desirable that the test in the installed state of the thermometer, ie during the process and exactly at the operating point of the plant, can be done. Furthermore, the element to be tested should be as possible be disconnected from the measuring circuit, so that the test can be done during the process.

In This reference will also include the construction of thermometers so-called mini-fixed point cells described. By installing the Miniaturfixpunktzellen in the protective tube of the temperature sensor, in particular with thermocouples, there is a Selbstkalibrierungsmöglichkeit of the thermocouple. The miniature fixpoint cells, their dimensions in the range 4 mm to 5 mm outside diameter and approx. 20 mm long, can in the top of the thermocouple to be built in. Is the fixed point used as possible close to the actual operating temperature or at the operating point, are a simple way to highly accurate checks the sensor characteristic with the miniature fixed point cell possible.

at so-called high temperature thermocouples it is common that they have a center hole for testing purposes can be used. For this purpose, a multi-hole capillary is in the ceramic protective tube housed, with the capillary holes different are. Outside, they are a few tenths of a millimeter and pick up the thermocouple wires. Inside has the capillary a several millimeters large inner hole. Through this inner hole can then for testing purposes a measuring capillary be inserted at the operating point, similar the other method described, check the working thermometer can.

Furthermore, also from the DE 10 2006 040 135 A1 a temperature sensor with test channel known. This built-in temperature sensor for gaseous and liquid media has a process connection for installation in pipelines, an electrical temperature sensor, a thermowell and a test channel for temporary recording of a control temperature sensor. The protective tube consists of a shaft tube, in which at least two sewer pipes are arranged in parallel, one of which contains the temperature sensor and the supply lines to this and a second sewer pipe forms the test channel. On the shaft tube, a process connection is arranged and at its lower end a bottom is arranged gas-tight, protrude through the end pieces of the sewer pipes, which is located in an end piece of the measuring resistor.

Of the Invention is based on the object, an improved built-in temperature sensor specify.

The The object is achieved by a built-in temperature sensor solved with the features of claim 1. The task becomes furthermore solved according to the invention a built-in temperature sensor with the features of the claim 7th

advantageous Embodiments of the invention are the subject of the dependent claims.

In A first embodiment comprises a built-in temperature sensor for gaseous and liquid media one Process connection for installation in pipelines or containers, a connection head for receiving electrical connection elements, at least a temperature sensor, a protective tube and a test channel for temporarily receiving a control temperature sensor, wherein in the protective tube at least one sewer pipe is arranged, which forms the test channel, wherein on the protective tube of the process connection is arranged and wherein at a lower end of the protective tube a Ground is arranged gas-tight.

In this first embodiment, the sewer pipe according to the invention is arranged eccentrically in the protective tube and formed with a maximum wall thickness of 0.2 mm, a side wall of the sewer pipe is at least partially thermally coupled to a side wall of the protective tube and / or a bottom of the sewer pipe is connected to the bottom of Thermowell at least partially thermally coupled, the bottom of the protective tube forms the bottom of the sewer pipe and the sewer pipe is material, force and / or positively connected to the protective tube.

Around a favorable static thermal measuring behavior also in To obtain a test case, the sewer pipe is preferably in particular laterally thermally coupled to the protective tube.

at the installation temperature sensor is one of these named process-controllable temperature sensor, the preferably for the temperature determination of flowing in pipelines gaseous and liquid media with changing Press and temperatures applicable. Such installation temperature sensor are in relatively short time intervals and during to control a running process with high accuracy. The built-in temperature sensor is also an error correction of temperature sensors with short installation lengths suitable in which due to a low thermal resistance of Protective tube and an associated, a temperature at the temperature sensor fake heat dissipation especially large Possible errors exist.

in the Contrary to built - in temperature sensors according to the state of Technology is the sewer pipe not in the middle of the protective tube, but is arranged eccentrically in the protective tube, next to the same eccentrically arranged in the protective tube temperature sensor. The temperature sensor is preferably in a further sewer pipe in a front area arranged the protective tube, which with the medium, its temperature to measure, comes in contact. Through this eccentric Arrangement, the protective tube has a much smaller outer diameter than with built-in temperature sensors according to the state of Technology. For this smaller outer diameter result reduced response times of the built-in temperature sensor in Compared to built - in temperature sensors according to the state of Technology.

Of the Built-in temperature sensor is easy to manufacture and during of the running process, its temperature sensor is controllable and so correctable that a so-called installation error can be minimized is. For this purpose, the sewer pipe is designed as a conduit, which with the control temperature sensor can be equipped. The thermal Coupling of the sewer pipe with the protective tube is due to the very thin-walled Optimized execution of the sewer pipe, so that in the Sewer pipe can be arranged control temperature sensor very well above the sewer pipe with the temperature sensor and with the protective tube and over this thermally coupled to the medium whose temperature is to be measured is. This is the temperature sensor of the built-in temperature sensor very easy to control by means of the control temperature sensor and correctable.

By the material, force and / or positive connection of the Sewer pipe with the protective tube is the thermal coupling, in particular also the lateral thermal coupling of the sewer pipe with the protective tube ensured. For this purpose, the sewer pipe is preferably in an upper Area welded to the protective tube, preferably such, that the bottom of the sewer pipe is pressed against the bottom of the protective tube is.

There the bottom of the protective tube also forms the bottom of the sewer pipe, are the sewer pipe in which the control temperature sensor can be arranged is, and in the protective tube or in another sewer pipe at the common Floor-mounted temperature sensor coupled very well thermally and over the protective tube or the common floor very much Well thermally coupled with the medium to measure its temperature is.

Especially in particular, a lower region of the sewer pipe is preferred, in to which the control temperature sensor can be arranged in an end position, Thermally coupled to the protective tube. Spaces between the sewer pipe and the protective tube and the temperature sensor or the further sewer pipe, in which the temperature sensor is arranged is preferably filled with a heat conduction, to optimize the heat conduction. This heat transfer agent is for example good heat conductive powder, a thermal paste or a good heat conductive potting compound.

Prefers The bottom of the protective tube is made of silver, as silver is special good heat is conductive.

Advantageously surmounted an upper end of the sewer pipe an upper end of the protective tube and / or the upper end of the sewer pipe is funnel-shaped, so that the control temperature sensor in a particularly simple manner in the sewer pipe is insertable.

Conveniently, an electronics module is arranged above the upper end of the protective tube and below the upper end of the sewer pipe on the sewer pipe, which preferably completely surrounds a circumference of the sewer pipe and / or is fastened to the sewer pipe. By means of this electronic module are sensor signals of the temperature sensor and preferably also of the control temperature sensor, if this is installed, receivable and evaluated, the temperature sensor is controllable and correctable by evaluating the sensor signals of the control temperature sensor. By the arrangement and preferably also attachment of the electronic module on the sewer pipe and in the connection head the built-in temperature sensor, the built-in temperature sensor is very compact, so it can be installed easily, quickly and easily and with a small space requirement.

In an advantageous embodiment are in the protective tube two or more Sewer pipes arranged, all sewer pipes have a common bottom and over their side walls at least partially thermally coupled together. At least one of the sewer pipes is a conduit in which the control temperature sensor can be arranged is and which is thus designed as a test channel. In the other sewer pipes are preferably arranged temperature sensors or arrangeable, for example, several different temperature sensors for different temperature ranges.

In A second embodiment comprises a built-in temperature sensor for gaseous and liquid media as well a process connection for installation in pipelines or containers, a connection head for receiving electrical connection elements, at least one temperature sensor, a protective tube and a test channel for temporarily receiving a control temperature sensor, wherein is arranged on the protective tube of the process connection and wherein on a lower end of the protective tube, a bottom is arranged gas-tight.

In this second embodiment is according to the invention in the protective tube arranged an exchangeable measuring insert, the one Includes measuring insert tube, wherein in the measuring insert tube at least a sewer pipe is arranged eccentrically, which is the test channel forms, with the sewer pipe with a wall thickness of maximum 0.2 mm is formed, wherein a side wall of the sewer pipe with a side wall of the measuring insert tube and / or a bottom of the sewer pipe with a bottom of the measuring insert tube at least partially thermally are coupled / is, wherein the bottom of the measuring insert tube the ground of the sewer pipe forms and wherein the sewer pipe with the measuring insert tube material, force and / or positively connected. Of the Measuring insert is particularly advantageous also in a protective tube of a Built-in temperature sensor according to the prior art insertable, whereby such installation temperature sensor can be retrofitted and can be modernized.

Around a favorable static thermal measuring behavior also in To obtain a test case, the sewer pipe is preferably in particular laterally thermally coupled to the measuring insert tube.

Also in this second embodiment of the installation temperature sensor it is a so-called process-controllable Temperature sensor, preferably for temperature determination of flowing in pipelines gaseous and liquid media with changing pressures and temperatures applicable is and which at relatively short intervals and during to control a running process with high accuracy is. This built-in temperature sensor is also an error correction of Temperature sensors with short installation lengths suitable, where due to a low thermal resistance of Protective tube and an associated, a temperature at the temperature sensor falsifying Heat dissipation particularly large error possibilities consist. This second embodiment is characterized by the measuring insert, which interchangeably arranged in the installation temperature sensor is, besides the exam in the ongoing process of further also by removing the measuring insert and immersing in a test bath testable.

In this second embodiment of the installation temperature sensor the sewer pipe is arranged eccentrically in the measuring insert tube, next to the also arranged eccentrically in the measuring insert tube temperature sensor. The temperature sensor is preferably in a further sewer pipe arranged in a front region of the measuring insert tube, which over the protective tube with the medium whose temperature is to be measured, comes into contact. Through this eccentric arrangement The measuring insert tube has a small outer diameter on, making it easy in the protective tube of the built-in temperature sensor is insertable. Due to the small outer diameter is also a small outer diameter of the protective tube allows resulting in reduced response times of the built - in temperature sensor in the Compared to built - in temperature sensors according to the state of Technology result. Due to the small outer diameter of the measuring insert tube, the measuring insert is also problem-free in a protective tube of a built-in temperature sensor after the State of the art insertable to retrofit this and modernize.

This embodiment of the installation temperature sensor is easy to produce and during the ongoing process whose temperature sensor is controllable and correctable so that a so-called installation error can be minimized. For this purpose, the sewer pipe is designed as a conduit, which can be equipped with the control temperature sensor. The thermal coupling of the sewer pipe with the measuring insert tube and over this with the protective tube is optimized by the very thin-walled design of the sewer pipe, so that can be arranged in the sewer pipe control temperature sensor very well on the sewer pipe with the temperature sensor and the measuring tube with the thermowell and on this with the medium whose temperature is to be measured is thermally coupled. Thus, the temperature sensor of the built-in temperature sensor by means of the control temperature sensor is very easy to control and korri gierbar.

By the material, force and / or positive connection of the Sewer pipe with the measuring insert tube is the thermal coupling, in particular, the lateral thermal coupling of the sewer pipe with the measuring insert tube and above it with the protective tube ensured. For this purpose, the sewer pipe is preferably in an upper Area welded to the measuring insert tube, preferably such that the bottom of the sewer pipe to the bottom of the measuring insert tube is pressed.

There the bottom of the measuring insert tube also forms the bottom of the sewer pipe, are the sewer pipe in which the control temperature sensor can be arranged, and in the measuring insert tube or in another sewer pipe at the common Floor-mounted temperature sensor coupled very well thermally and over the measuring insert tube or the common floor very good with the thermowell and this with the medium thermally coupled, whose temperature is to be measured.

Especially in particular, a lower region of the sewer pipe is preferred, in to which the control temperature sensor can be arranged in an end position, thermally coupled to the measuring insert tube. interspaces between the sewer pipe and the measuring insert tube as well as the temperature sensor or the further sewer pipe, in which the temperature sensor is arranged is preferably filled with a heat conduction, to optimize the heat conduction. This heat transfer agent is for example good heat conductive powder, a thermal paste or a good heat conductive potting compound.

Prefers consists of the bottom of the protective tube and / or the bottom of the measuring insert tube made of silver, because silver is particularly good heat-conducting.

Advantageously surmounted an upper end of the sewer pipe an upper end of the protective tube and / or an upper end of the measuring insert tube and / or the upper end of the Sewer pipe is funnel-shaped, so that the Control temperature sensor in a particularly simple manner in the sewer pipe insertable is.

Conveniently, is above the top of the thermowell and / or over the upper end of the measuring insert tube and below the upper end of the Sewer pipe at the sewer pipe an electronic module arranged, which preferably completely encloses a circumference of the sewer pipe and / or attached to the sewer pipe. By means of this electronic module are sensor signals of the temperature sensor and preferably also of the Control temperature sensor, if installed, receivable and evaluable, wherein the temperature sensor by evaluating the Sensor signals of the control temperature sensor controllable and correctable is. By the arrangement and preferably also attachment of the electronic module on the sewer pipe and in the connection head of the built-in temperature sensor is the built-in temperature sensor very compact, making it easy, quick and easy and with a low Installation space is installable.

In an advantageous embodiment are in the measuring insert tube two or more sewer pipes arranged, with all sewer pipes sharing a common floor and over their side walls at least partially thermally coupled together. At least one the sewer pipes is a conduit in which the control temperature sensor can be arranged is and which is thus designed as a test channel. In the other sewer pipes are preferably arranged temperature sensors or arrangeable, for example, several different temperature sensors for different temperature ranges.

In Both alternative designs have a diameter of Sewer pipe preferably smaller than 2.5 mm. By this very small Diameter is also the protective tube and, when inserted, the measuring insert tube executable with a very small outside diameter. This smaller outer diameter results in reduced Response times of the built-in temperature sensor in comparison to built-in temperature sensors according to the prior art.

In both alternative versions have the connection head prefers a test opening for insertion of the control temperature sensor in the sewer pipe. The test opening For example, it consists of a sealing and herausschraubbaren Knurled screw with suspension line. For testing is the Test opening by unscrewing the screw to open. This is feasible during the process, so that the installation temperature sensor of a measuring process or a technological process can be tested. By the Test opening is the installation temperature sensor testable, without the connection head, which can be opened, to open. This is a removal of a seal of the connection head, which for technical reasons often arranged on the connection head, to avoid.

embodiments The invention will be described in more detail below with reference to drawings explained.

In this demonstrate:

1a a longitudinal section of a first embodiment of a built-in temperature sensor,

1b a longitudinal section of a protection tube of a first embodiment of a built-in temperature sensor,

2 a longitudinal section of a second alternative embodiment of a built-in temperature sensor,

3a a cross section of an embodiment of a built-in temperature sensor, and

3b a sectional view along the section line IIIb-IIIb in 3a ,

each other corresponding parts are in all figures with the same reference numerals Mistake.

1a shows a longitudinal section of a first embodiment of a built-in temperature sensor 1 for gaseous and liquid media and 1b a longitudinal section of a protective tube 2 the first version of the installation temperature sensor 1 , The installation temperature sensor 1 has one at an upper end of the protective tube 2 arranged connection head 3 for receiving electrical connection elements.

The connection head 3 , which is made of stainless steel or an aluminum alloy, for example, is made of two parts 3.1 . 3.2 formed, with a lower part 3.1 on the protective tube 2 is attached and an upper part 3.2 hinged on the lower part 3.1 is attached. To prevent unauthorized opening of the connection head 3 and a manipulation of the built-in temperature sensor 1 to prevent is the connection head 3 by means of a seal 4 locked. This is necessary, for example, to ensure proper calibration of the installation temperature sensor 1 ensure and prevent manipulation after calibration.

The protective tube 2 has a process connection 5 for installation of the installation temperature sensor 1 in pipelines or containers to measure a temperature of a medium in it.

In the protective tube 2 is a sewer pipe 6 arranged, which is designed as a conduit and forms a test channel for temporarily receiving a control temperature sensor. The sewer pipe 6 is eccentric in the protective tube 2 arranged, thin-walled, with a maximum wall thickness of 0.2 mm, preferably 0.1 mm and has a diameter of less than 2.5 mm.

Due to the eccentric arrangement, the protective tube 2 a much smaller outer diameter than with built-in temperature sensors according to the prior art. This smaller outer diameter results in reduced response times of the built-in temperature sensor 1 compared to built-in temperature sensors according to the prior art.

A side wall 6.1 of the sewer pipe 6 is with a side wall 2.1 of the protective tube 2 at least partially thermally coupled. Preferably, in particular, a lower region of the side wall 6.1 of the sewer pipe 6 in which the control temperature sensor can be arranged in an end position, with the protective tube 2 thermally coupled. An upper area of the sewer pipe 6 can, as shown here, also from the protective tube 2 be slightly spaced, for example, a heat introduction of an environment outside the medium whose temperature is to be measured, in the sewer pipe 6 and to avoid the control temperature sensor.

At a lower end of the protective tube 2 is a floor 2.2 arranged gas-tight, which consists of good heat conductive silver. This floor 2.2 of the protective tube 2 points to an inside of the protective tube 2 two recesses on. In a first recess is the sewer pipe 6 arranged, with the floor 2.2 of the protective tube 2 also a floor 6.2 of the sewer pipe 6 forms. Furthermore, the sewer pipe 6 in the region of an upper end of the protective tube 2 with the protective tube 2 welded and welded 7 with the protective tube 2 cohesively connected, so that it at least partially on the side wall 2.1 of the protective tube 2 is present and in its position relative to the side wall 2.1 and in particular with respect to the soil 2.2 of the protective tube 2 is held. This is the thermal coupling of the sewer pipe 6 with the protective tube 2 optimized.

In a second recess of the floor 2.2 of the protective tube 2 is a temperature sensor 8th of the installation temperature sensor 1 arranged and in 1b , preferably also in 1a , with thermal adhesive 9 on the ground 2.2 of the protective tube 2 attached and thermally coupled with this. In 1b is the sewer pipe 6 arranged in the first recess and, for example, with the Wärmeleitkleber 9 on the ground 2.2 of the protective tube 2 attached and thermally coupled with this.

The temperature sensor 8th is via sensor connection wires 10 with electrical connections 11 of the installation temperature sensor 1 connected via which the temperature sensor 8th in the 1a illustrated example with a connection head 3 arranged electronic module 12 is coupled. Furthermore, the temperature sensor 8th over these connections 11 For example, be coupled to an external evaluation unit, not shown, in which case leads not shown here to this external evaluation by a passage 13 with cable gland 14 at the on circuit-head 3 are feasible.

By means of the electronic module 12 or the external evaluation unit are sensor signals of the temperature sensor 8th and preferably also the control temperature sensor, when installed, receivable and evaluable, wherein the temperature sensor 8th is controllable and correctable by evaluating the sensor signals of the control temperature sensor. By the arrangement and preferably also attachment of the electronic module 12 at the sewer pipe 6 and in the connection head 3 of the installation temperature sensor 1 is the installation temperature sensor 1 very compact, so that it is easy, quick and easy to install and with a small space requirement.

Spaces between the sewer pipe 6 and the protective tube 2 and the temperature sensor 8th are with a heat transfer fluid 15 filled to optimize heat conduction. This heat transfer agent 15 In the example shown here is a good heat conductive powder, such as alumina. Furthermore, as heat transfer agents 15 For example, a thermal paste or a good heat conductive potting compound used.

By the heat conduction 15 is the sewer pipe 6 even in areas where it is not on the protective tube 2 rests with the protective tube 2 thermally coupled, if desired. Is a thermal coupling of the sewer pipe 6 with the protective tube 2 for example, in upper regions of the protective tube 2 not desired to heat input into the sewer pipe 6 to avoid an environment outside the medium, whose temperature is to be measured, so is in these areas between the sewer pipe 6 and the protective tube 2 preferably no heat transfer agent 15 arranged and the sewer pipe 6 is from the protective tube 2 , as shown here, slightly spaced.

An upper end 6.3 of the sewer pipe 6 is through the electronics module 12 passed through, protrudes into the connection head 3 in and is funnel-shaped, so that the control temperature sensor in a particularly simple manner in the sewer pipe 6 is insertable. The sewer pipe 6 is fixed to the electronics module 12 connected. The funnel-shaped upper end 6.3 of the sewer pipe 6 is below one in the upper part 3.2 of the connection head 3 trained test opening 16 arranged. The test opening 16 is formed from a hole in the upper part 3.2 of the connection head 3 , which for example by means of a sealing and herausschraubbaren knurled screw 17 Lockable with a line. By the leash is ensured that the thumbscrew 17 can not be lost.

The fixed arrangement of the sewer pipe 6 to the electronic module 12 allows you to enter fixed correction numbers or correction values in the electronic module 12 , which with an installation length of the installation temperature sensor 1 in a pipeline or in a container. Such basic settings are vorabbar vornehmbar due to a present solid internal structure in known measuring ranges. In some cases, however, an immersion length of the built-in temperature sensor deviates 1 into the medium from the installation length, which further corrections are required.

Since the immersion length also varies with a fluctuating level of the pipe or the container, such corrections are not carried out in advance. The trained in the test channel sewer pipe 6 insertable control temperature sensor, however, can be calibrated in advance with respect to levels or immersion depths, so that by using the control temperature sensor in the built-in temperature sensor 1 an application-related correction of the installation temperature sensor 1 is feasible. This application-related correction can be done via the electronic module 12 , about a correction of the temperature sensor 8th and / or via a correction of the installation temperature sensor 1 itself, for example, its installation position and / or orientation with respect to the medium, take place.

The installation temperature sensor 1 is easy to manufacture and during a running process is its temperature sensor 8th controllable and correctable so that a so-called installation error can be minimized. The thermal coupling of the sewer pipe 6 with the protective tube 2 is due to the very thin-walled design of the sewer pipe 6 optimized so that in the sewer pipe 6 Anordbare control temperature sensor very well over the sewer pipe 6 with the temperature sensor 8th and with the protective tube 2 and thermally coupled via this to the medium whose temperature is to be measured. This is the temperature sensor 8th of the installation temperature sensor 1 very easy to control and correct by means of the control temperature sensor.

2 shows a longitudinal section of a second alternative embodiment of the installation temperature sensor 1 , In this version is in the installation temperature sensor 1 a replaceable measuring insert 18 arranged. This measuring insert 18 includes a measuring insert tube 19 , which in the example shown here at an upper end of a measuring insert socket 20 with the electrical connections 11 for the temperature sensor 8th having. Alternative to this measuring insert base 20 is for example also the electronic module 12 on this measuring insert tube 19 locatable.

In this version is the measuring insert tube 19 in the protective tube 2 arranged and the channel pipe 6 , which is designed as a conduit and forms the test channel for temporarily receiving the control temperature sensor, is eccentric in the measuring insert tube 19 arranged. Again, this is the sewer pipe 6 thin-walled, with a maximum wall thickness of 0.2 mm, preferably 0.1 mm and has a diameter of less than 2.5 mm.

Due to this eccentric arrangement, the measuring insert tube 19 a small outer diameter, making it easy in the protective tube 2 of the installation temperature sensor 1 is insertable. Due to the small outer diameter is also a small outer diameter of the protective tube 2 allows, resulting in reduced response times of the built-in temperature sensor 1 Compared to built-in temperature sensors according to the prior art result. Due to the small outer diameter of the measuring insert tube 19 is the measuring insert 18 furthermore easily into a protective tube 2 a built-in temperature sensor according to the prior art insertable to retrofit and modernize.

This second version is through the measuring insert 18 , which can be exchanged in the installation temperature sensor 1 In addition to an examination in the ongoing process, it is also possible to remove the measuring insert 18 and immersion in a Prüfbad verifiable, however, the seal 4 to destroy and the connection head 3 to open the measuring insert 18 refer to.

Also this version of the installation temperature sensor 1 is easy to produce and during the running process is its temperature sensor 8th controllable and correctable so that the so-called installation error can be minimized. The thermal coupling of the sewer pipe 6 with the measuring insert tube 19 and about this with the thermowell 2 is due to the very thin-walled design of the sewer pipe 6 optimized so that in the sewer pipe 6 Anordbare control temperature sensor very well over the sewer pipe 6 with the temperature sensor 8th and over the measuring insert tube 19 with the protective tube 2 and thermally coupled via this to the medium whose temperature is to be measured. This is the temperature sensor 8th of the installation temperature sensor 1 very easy to control and correct by means of the control temperature sensor.

Also in this embodiment, the protective tube 2 the process connection 5 for installation of the installation temperature sensor 1 in pipelines or containers to measure a temperature of a medium in it.

In this version of the installation temperature sensor 1 is the sidewall 6.1 of the sewer pipe 6 at least partially with a side wall 19.1 of the measuring insert tube 19 thermally coupled. Preferably, in particular, a lower region of the side wall 6.1 of the sewer pipe 6 in which the control temperature sensor can be arranged in an end position, with the measuring insert tube 19 thermally coupled. An upper area of the sewer pipe 6 can, as shown here, also from the measuring insert tube 19 be slightly spaced, for example, a heat introduction of an environment outside the medium whose temperature is to be measured, in the sewer pipe 6 and to avoid the control temperature sensor.

A floor 19.2 of the measuring insert tube 19 is preferably made of silver and also forms the soil 6.2 of the sewer pipe 6 , Also the temperature sensor 8th of the installation temperature sensor 1 is in the measuring insert tube 19 at the bottom 19.2 arranged. The sewer pipe 6 and the temperature sensor 8th are preferably with thermal adhesive 9 on the ground 19.2 of the measuring insert tube 19 attached and thermally coupled with this.

In this version is the sewer pipe 6 in the region of an upper end of the measuring insert tube 19 welded with this and by the welding 7 with the measuring insert tube 19 cohesively connected, so that it at least partially on the side wall 19.1 of the measuring insert tube 19 is present and in its position relative to the side wall 19.1 and in particular with respect to the soil 19.2 of the measuring insert tube 19 is held. This is the thermal coupling of the sewer pipe 6 with the measuring insert tube 19 optimized.

Also in this embodiment is the temperature sensor 8th via the sensor connection wires 10 with electrical connections 11 of the installation temperature sensor 1 connected. In the example shown here are these connections 11 at the measuring insert base 20 arranged, for example, for connection to an external evaluation.

Spaces between the sewer pipe 6 and the measuring insert tube 19 and the temperature sensor 8th are also here preferably with a heat transfer medium 15 filled to optimize heat conduction. This heat transfer agent 15 is, for example, good heat conductive powder, for example alumina, a thermal grease or a good heat conductive potting compound.

By the heat conduction 15 is the sewer pipe 6 even in areas where it is not on the measuring insert tube 19 rests with the measuring insert tube 19 thermally coupled, if desired. Is a thermal coupling of the sewer pipe 6 with the measuring insert tube 19 For example, in the upper areas of the measuring insert tube 19 not desired to heat input into the sewer pipe 6 from one To avoid environment outside of the medium, whose temperature is to be measured, so is in these ranges between the sewer pipe 6 and the measuring insert tube 19 preferably no heat transfer agent 15 arranged and the sewer pipe 6 is from the measuring insert tube 19 a little bit apart.

The upper end 6.3 of the sewer pipe 6 is in the example shown here by the measuring insert socket 20 passed it so that it also in this example in the connection head 3 protrudes, which this design of the installation temperature sensor 1 analogous to that in the 1a and 1b having illustrated embodiment. Ie. Again, the connection head 3 at the upper end of the protective tube 2 arranged and made of two parts 3.1 . 3.2 formed, with the lower part 3.1 on the protective tube 2 is attached and the upper part 3.2 hinged on the lower part 3.1 is attached. Again, there is an unauthorized opening of the connection head 3 and a manipulation of the built-in temperature sensor 1 to prevent the connection head 3 by means of the seal 4 locked.

Again, this is the top end 6.3 of the sewer pipe 6 funnel-shaped, so that the control temperature sensor in a particularly simple manner in the sewer pipe 6 is insertable. Analogous to that in the 1a and 1b illustrated embodiment is also the funnel-shaped upper end in this embodiment 6.3 of the sewer pipe 6 below in the upper part 3.2 of the connection head 3 trained test opening 16 arranged, which from the bore in the upper part 3.2 of the connection head 3 is formed, for example, by means of the sealing and herausschraubbaren thumbscrew 17 Lockable with a line.

3a shows a cross section of an embodiment of the installation temperature sensor 1 and 3b a sectional view along the section line IIIb-IIIb in 3a , wherein for reasons of clarity, the connection head 3 not shown. In this embodiment, in the protective tube shown here 2 three sewer pipes 6 . 21 . 22 arranged, of which a sewer pipe 6 is designed as a conduit and forms the test channel. In the other sewer pipes 21 . 22 are preferably temperature sensors 8th arranged, for example, two different temperature sensors 8th for different temperature ranges. Analogous to the illustrated embodiment, this embodiment is also on the alternative embodiment of the installation temperature sensor 1 with measuring insert 18 applicable, in which the three sewer pipes 6 . 21 22 in the measuring insert tube 19 would be arranged.

All three sewer pipes 6 . 21 22 have a common ground 6.2 on, which in the example shown here also the ground 2.2 of the protective tube 2 forms, leaving the sewer pipes 6 . 21 . 22 thermally with each other and with the protective tube 2 are coupled. The sewer pipes 6 . 21 . 22 are thin-walled, preferably with a wall thickness of 0.2 mm, more preferably with a wall thickness of 0.1 mm and have a small diameter, preferably less than 2.5 mm. The sewer pipes 6 . 21 . 22 are arranged such that they are laterally contacted and thermally coupled together.

1

Mounting temperature sensor

2

thermowell

2.1

Side wall of the protective tube

2.2

ground of the protective tube

3

connection head

3.1

lower part

3.2

upper part

4

sealing

5

process connection

6

sewer pipe

6.1

Side wall of the sewer pipe

6.2

ground of the sewer pipe

6.3

upper End of the sewer pipe

7

welding

8th

temperature sensor

9

Thermal Adhesive

10

Sensor connection wires

11

electrical connections

12

electronic module

13

execution

14

Cable gland

15

Thermal interface

16

test opening

17

thumbscrew

18

Feeler

19

Measuring insert tube

19.1

Side wall of the measuring insert tube

19.2

ground of the measuring insert tube

20

Measuring insert base

21 22

Further sewer pipes

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• - DE 102006040135 A1 [0006]

Claims (14)

Built-in temperature sensor ( 1 ) for gaseous and liquid media with a process connection ( 5 ) for installation in pipelines or containers, a connection head ( 3 ) for receiving electrical connection elements, at least one temperature sensor ( 8th ), a protective tube ( 2 ) and a test channel for temporarily receiving a control temperature sensor, wherein in the protective tube ( 2 ) at least one sewer pipe ( 6 ), which forms the test channel, wherein the protective tube ( 2 ) the process connection ( 5 ) and wherein at a lower end of the protective tube ( 2 ) a floor ( 2.2 ) is arranged gas-tight, characterized in that the sewer pipe ( 6 ) eccentric in the protective tube ( 2 ) is arranged and formed with a wall thickness of not more than 0.2 mm that a side wall ( 6.1 ) of the sewer pipe ( 6 ) with a side wall ( 2.1 ) of the protective tube ( 2 ) and / or a floor ( 6.2 ) of the sewer pipe ( 6 ) with the ground ( 2.2 ) of the protective tube ( 2 ) are at least partially thermally coupled / is, wherein the soil ( 2.2 ) of the protective tube ( 2 ) the ground ( 6.2 ) of the sewer pipe ( 6 ) and that the sewer pipe ( 6 ) with the protective tube ( 2 ) is material, force and / or positively connected. Built-in temperature sensor ( 1 ) according to claim 1, characterized in that the floor ( 2.2 ) of the protective tube ( 2 ) consists of silver. Built-in temperature sensor ( 1 ) according to claim 1 or 2, characterized in that an upper end ( 6.3 ) of the sewer pipe ( 6 ) an upper end of the protective tube ( 2 ) and / or that the upper end ( 6.3 ) of the sewer pipe ( 6 ) is funnel-shaped. Built-in temperature sensor ( 1 ) according to claim 3, characterized in that above the upper end of the protective tube ( 2 ) and below the upper end ( 6.3 ) of the sewer pipe ( 6 ) on the sewer pipe ( 6 ) an electronic module ( 12 ) is arranged. Built-in temperature sensor ( 1 ) according to claim 4, characterized in that the electronic module ( 12 ) a circumference of the sewer pipe ( 6 ) completely encloses and / or on the sewer pipe ( 6 ) is attached. Built-in temperature sensor ( 1 ) according to one of claims 1 to 5, characterized in that in the protective tube ( 2 ) two or more sewer pipes ( 6 . 21 . 22 ) are arranged, with all sewer pipes ( 6 . 21 . 22 ) a common ground ( 6.2 ) and over their side walls ( 6.1 ) are at least partially thermally coupled together. Built-in temperature sensor ( 1 ) for gaseous and liquid media with a process connection ( 5 ) for installation in pipelines or containers, a connection head ( 3 ) for receiving electrical connection elements, at least one temperature sensor ( 8th ), a protective tube ( 2 ) and a test channel for temporarily receiving a control temperature sensor, wherein the protective tube ( 2 ) the process connection ( 5 ) and wherein at a lower end of the protective tube ( 2 ) a floor ( 2.2 ) is arranged gas-tight, characterized in that in the protective tube ( 2 ) a replaceable measuring insert ( 18 ), which is a measuring insert tube ( 19 ), wherein in the measuring insert tube ( 19 ) at least one sewer pipe ( 6 ) is arranged eccentrically, which forms the test channel, wherein the sewer pipe ( 6 ) is formed with a maximum wall thickness of 0.2 mm, wherein a side wall ( 6.1 ) of the sewer pipe ( 6 ) with a side wall ( 19.1 ) of the measuring insert tube ( 19 ) and / or a floor ( 6.2 ) of the sewer pipe ( 6 ) with a floor ( 19.2 ) of the measuring insert tube ( 19 ) are at least partially thermally coupled / is, wherein the soil ( 19.2 ) of the measuring insert tube ( 19 ) the ground ( 6.2 ) of the sewer pipe ( 6 ) and wherein the sewer pipe ( 6 ) with the measuring insert tube ( 19 ) is material, force and / or positively connected. Built-in temperature sensor ( 1 ) according to claim 7, characterized in that the floor ( 2.2 ) of the protective tube ( 2 ) and / or the soil ( 19.2 ) of the measuring insert tube ( 19 ) consists of silver. Built-in temperature sensor ( 1 ) according to claim 7 or 8, characterized in that an upper end ( 6.3 ) of the sewer pipe ( 6 ) an upper end of the protective tube ( 2 ) and / or an upper end of the measuring insert tube ( 19 ) and / or that the upper end ( 6.3 ) of the sewer pipe ( 6 ) is funnel-shaped. Built-in temperature sensor ( 1 ) according to claim 9, characterized in that above the upper end of the protective tube ( 2 ) and / or above the upper end of the measuring insert tube ( 19 ) and below the upper end ( 6.3 ) of the sewer pipe ( 6 ) on the sewer pipe ( 6 ) an electronic module ( 12 ) is arranged. Built-in temperature sensor ( 1 ) according to claim 10, characterized in that the electronic module ( 12 ) a circumference of the sewer pipe ( 6 ) completely encloses and / or on the sewer pipe ( 6 ) is attached. Built-in temperature sensor ( 1 ) according to one of claims 7 to 11, characterized in that in the measuring insert tube ( 19 ) two or more sewer pipes ( 6 . 21 . 22 ) are arranged, with all sewer pipes ( 6 . 21 . 22 ) a common ground ( 6.2 ) and over their side walls ( 6.1 ) are at least partially thermally coupled together. Built-in temperature sensor ( 1 ) according to one of the preceding claims, characterized gekennzeich net that a diameter of the sewer pipe ( 6 ) is less than 2.5 mm. Built-in temperature sensor ( 1 ) according to one of the preceding claims, characterized in that the connection head ( 3 ) a test opening ( 16 ) for introducing a control temperature sensor into the sewer pipe ( 6 ) having.