Rub­ber Hood 

The JÄGER Group brings all cables under the hood! 





High­est pre­ci­sion and small­est tolerances!

This is what lab­o­ra­to­ry and mea­sure­ment tech­nol­o­gy is all about. There is no room for inac­cu­ra­cies in those areas where thou­sandths and ten thou­sandths are involved. Knick Elek­tro­n­is­che Mess­geräte GmbH Co. KG is well aware of this, as it has been pro­duc­ing and sup­ply­ing high-qual­i­ty elec­tron­ic mea­sur­ing instru­ments for inter­face and process analy­sis for over 75 years. This qual­i­ty stan­dard, which runs through the entire Knick prod­uct range, is also what keeps the company‘s design­ers rest­less and presents them with a chal­lenge.

Immer­sion fit­tings, which for exam­ple deter­mine the pH val­ue, the oxy­gen con­tent or also the con­duc­tiv­i­ty of liq­uids, are to be sealed against the sur­round­ing medi­um. Reli­able pro­tec­tion of the inter­nal sen­sor against the exist­ing envi­ron­men­tal influ­ences is the goal of the con­sid­er­a­tions. How­ev­er, this is more dif­fi­cult than ini­tial­ly expect­ed, because this is a com­plete­ly new devel­op­ment that can­not be han­dled by Knick alone due to exten­sive spec­i­fi­ca­tions. For this rea­son, Jäger Gum­mi und Kun­st­stoff GmbH has been entrust­ed with the con­struc­tive imple­men­ta­tion of the project. As a long-stand­ing sup­pli­er, Jäger has already proven to be a reli­able and inno­v­a­tive part­ner for var­i­ous oth­er prod­uct inquiries. First of all, the customer‘s wish­es and require­ments must be clar­i­fied. Clear cost spec­i­fi­ca­tions regard­ing prod­uct and tools pro­vide a clear project frame­work. But how can the spec­i­fi­ca­tions for the prod­uct ide­al­ly be real­ized for sev­er­al mea­sur­ing instru­ments at the same time?


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!

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One Prod­uct – Many Possibilites

Due to the devel­op­ment of Jäger, all require­ments of the Knick com­pa­ny can be mas­tered. A prod­uct, which is opti­mal­ly designed for the appli­ca­tion and can be adapt­ed to dif­fer­ent sen­sors, is the result of the coop­er­a­tion. Due to the cho­sen con­cept with only one tool the costs can be kept low, which results in a mutu­al com­pet­i­tive advan­tage. A fur­ther advan­tage is that the sup­ply of spare parts and the pro­cure­ment of prod­ucts at the customer‘s premis­es is also made con­sid­er­ably eas­i­er and more cost­ef­fec­tive by this con­cept. A result that is worth see­ing and which under­lines the suc­cess­ful coop­er­a­tion between the two partners.

Your con­tact for rub­ber hood:

Loca­tion Chemnitz

S. Schu­bert

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