DE202006002376U1 - Measuring device e.g. temperature sensor, for e.g. fluid medium, has plug connector firmly integrated with head of housing, where housing has upper part connected with protective cover of housing by threaded connection - Google Patents

Abstract

The device has an M-12 plug connector (3) firmly integrated with a head of the housing, and a sensor unit screwed at the housing with or without evaluation electronics. The connection of the plug connecter with the housing head is a unit component part and is inserted into a hole in a lower part of the housing. The housing has an upper part (1) that is connected with a protective cover of the housing by a threaded connection.

Description

The Application relates to a temperature sensor for each liquid and gaseous medium for the area of mechanical and plant engineering, based on the electronic Measuring technology.

The available on the market today temperature sensor with exchangeable measuring insert, all are based on the same principle built up. It consists of the measuring resistor or thermocouple as a measuring insert, the protective tube, the connection head and the inside located connection socket and possibly still compression fittings, Flanges or sliding sleeves.

Of the Measuring insert is a prefabricated unit consisting of the insert tube, the measuring resistor (sensor) and the supply lines includes, the mounting plate and the connector socket. Measuring inserts are standardized in DIN 43762 and have a diameter of 8.6 up to 3 mm. At the connection side of the insert tube is the Mounting plate with a ceramic or mounted on a circuit board Clamp base and the spring-loaded mounting screws attached. The springs under the fixing screws ensure that the measuring insert always firmly pressed to the bottom of the protective tube.

in the Connection head of a protective fitting is the terminal block the resistance thermometer or Thermoelemet measuring insert optionally also a temperature transmitter. connection heads are standardized in DIN 43749. Regardless of that, too connection heads proven, which deviate from this standard. In all these constructions will be the measuring insert is screwed to the bottom of the connection head by means of the fastening screws.

• 1. Das notwendige Kabel wird seitlich am Gehäuse durch die Kabelverschraubung geführt und die einzelnen Litzen werden mittels Schraubklemmen am Messumformer oder am Klemmensockel angeschlossen.
• 2. In der zweiten Variante wird seitlich am Gehäuse der M-12 Stecker angebracht und mit Hilfe eines standardisierten Rundkabel mit M12-Steckverbinder die Daten weiter verarbeitet.
• 3. In der dritten Variante wird ein M-12 Steckerverbinder in dem Schraubdeckel des Kopfes des Messgehäuses montiert und mit Hilfe eines Gewindes und durch diese Bohrung mit der Elektronik in dem Gehäuse verbunden. Dies hat zur Folge, dass bei Entfernung des Deckels des Gehäuses durch die Schraubdrehung die sich im Gehäuse befindlichen Drähte und Kabel die Drehbewegung des Deckels mitmachen und dabei die Kabel und Drähte belastet werden, mit der Folge, dass Sollbruchstellen entstehen.

The forwarding of the temperature data from the temperature sensor with or without evaluation to a central computer takes place in three ways:

• 1. The required cable is routed through the cable gland on the side of the housing and the individual strands are connected to the transmitter or to the terminal base using screw terminals.
• 2. In the second variant, the M-12 connector is mounted on the side of the housing and the data is further processed with the help of a standardized round cable with M12 connector.
• 3. In the third variant, an M-12 plug connector is mounted in the screw cap of the head of the measuring housing and connected by means of a thread and through this hole with the electronics in the housing. This has the consequence that when removing the cover of the housing by the screw rotation located in the housing wires and cables join in the rotation of the lid and thereby the cables and wires are loaded, with the result that predetermined breaking points.

The Production plants are mostly after ISO 9000 or HACCP certified and provide additional to the cyclical measuring point checks Conditions.

The means for semi-annual or annual Measuring point checks. We want to briefly illustrate this with the example of a temperature sensor. The cleaning process is finished, the pipeline is empty, the sensor can be removed. It should be checked be, whether the feeler or the measuring circuit is still within the specified accuracy. Before the feeler must be tested in a block calibrator, appropriate precautions must be taken to be hit. In all three cases must be the feeler disconnected and measuring insert screwed out with or without transmitter if not the unit below the head (depending on the design different) can be dismantled again with the evaluation of the Blockkalibrators connect to.

The The invention in the claim protection is based on the problem a temperature sensor to build, which is characterized in that the housing including the on the housing head attached M-12 connector is firmly integrated and the probe unit (Measuring insert with or without electronic evaluation) in the housing springy is screwed in. The process connections are interchangeable with consistent upper housing part.

These Task is solved with the features listed in the protection claim 1.

The Construction of the temperature sensor is characterized in that the housing including the on the housing head attached M-12 connector is firmly integrated and the probe unit - depending on execution with or without evaluation electronics - screwed into the housing and in particular connects to the M-12 connector unit Part of the entire measuring device is and to the bore in the lower part of the housing is introduced.

The casing contains next to the hole for the Plug itself still Nutarretierungen

A advantageous embodiment of the invention is in the protection claim 2 shown.

With the invention is achieved that when you solve the upper housing part, for example, by a threaded Finally, the entire upper part with the corresponding inner life can be pulled out of the protective fitting without loosening the internal wiring. Measuring insert with / without evaluation electronics can now be reconnected for evaluation with the M12 connector located at the top for evaluation of the signals.

An embodiment of the invention will be with reference to the drawings 1 to 3 explained. Show it:

1 the completely assembled temperature sensor with housing upper part ( 1 ), Measuring insert incl. Screws and springs ( 2 ), M-12 connectors ( 3 )

2 the separate housing upper part with its inner life.

3 the separate housing upper part ( 1 ) with measuring insert incl. screws and springs ( 2 ), M-12 connectors ( 3 ) and a possible built-in transmitter ( 4 )

Claims (2)

Measuring device for the electrical detection of temperatures for all liquid and gaseous media also in hollow bodies of all kinds for the field of mechanical engineering with M-12 plug connection in the housing head, characterized in that the housing ( 1 ) including the M-12 connector ( 3 ) and the sensor unit ( 2 ) - depending on the version with or without transmitter ( 4 ) - is screwed into the housing and in particular a connection to the M-12 connector ( 3 ) Unit is part of the entire measuring device and is introduced to the bore in the lower part of the housing. Measuring device according to claim 1, characterized in that that when solve of the upper housing part e.g. by a threaded connection, the entire upper part with the associated Internal life can be pulled out of the protective fitting without losing the internal Solve wiring.