Universal applications required
First, the experts from Jäger look at the application in detail. The immersion fittings of the measuring instrument are equipped with different sensors depending on the application. Accordingly, these could in theory also be equipped with a single rubber hood, but it is not that simple. Depending on the sensor used, there are different cable diameters, which is why the feedthroughs inside the rubber hood would be too small for some sensor cables and too large for others. However, several rubber hoods for different cable diameters are not desired due to the resulting tooling and handling costs. Therefore Jäger und Knick are developing an alternative strategy: By adapting the geometry of the previous solution, a rubber hood should be usable for several cable diameters. For this purpose, the cable outlets are extended and graded according to different diameters. The whole thing is produced in compression molding (CM process) from an EPDM (ethylene-propylene-diene rubber) with 80 Shore, a material that is both longterm resistant and inexpensive, and which fits the requirement profile perfectly. To simplify things for the end user, the various cable versions are provided with a label indicating the different diameters. This saves additional time in case of application.
Thinking ahead for mutual success
After some considerations a first and promising design of the product can be realized. At this point the project could already be completed and handed over to the customer, but all parties involved are not yet 100 % satisfied with the execution. After several tests, it becomes clear that the introduction of the cables is not optimal, because they get stuck inside the rubber hood. So the design is once again examined more closely. However, after intensive consideration and a corresponding adjustment of the inner geometry, this challenge can be mastered. An extension of the interior cable ducts brings the breakthrough, so that each cable dome gets its own cable duct. This allows the cables of the various sensors of the immersion assembly to be replaced quickly and effectively without a complex process. One solution for all sensor variants!