Abstract: The invention pertains to the arrangement of a sensor housing (5) on a wall (2) on which the sensor housing (5) is held by means of a threaded nipple (4) in a tapped hole (3). In order to protect the sensor housing against disturbing environmental factors, especially dirt, moisture and wind without impairing the accessibility of torque transmitting features adjacent to the threaded nipple (4), an attachment (12) arranged on the wall (2) centrally around the sensor housing (5) is provided on whose cylindrical surface (13) facing toward the inner side the edge (15) of a soft elastic washer (14) engages. The washer also is sealably connected to the sensor housing (5). The washer (14) and the attachment (12) form a chamber (16) encapsulating the sensor housing (5). When a tool is positioned on the torque transmitting features the washer (14) yields elastically. Additional encapsulation is unnecessary to protect the sensor housing (5). The mounting activity is not impaired by the protection provided.

Abstract: A method for increasing the resistance to thermal shocks of the oxide layer of metallic heat conductive materials which contain 3% to 10% aluminum, 10% to 26% chromium, up to 3% zirconium and/or titanium and/or hafnium and/or niobium and/or silicon and/or 0.002% to 0.3% total of rare earths and/or yttrium in metallic form or as finely dispersed oxides, the remainder being iron and/or nickel and/or cobalt as well as the trace elements normally present in steels. The materials develop primarily aluminum oxide and/or chromium oxide on the surface when heated in a temperature range of 700.degree. C. to 1350.degree. C. in an oxygen-containing atmosphere. The materials are first heated in an oxygen-free atmosphere under conditions which cause recrystallization in their surface zone. They then are oxidized in an atmosphere which contains oxygen in chemically bound form.

Abstract: The invention relates to a semi-finished product for the production of catalysts, consisting of a metallic carrier and a coating of the carrier on its surface. The coating consists of particles of metallic powder anchored to the material of the carrier and to each other by sintering and contains pores. The invention also provides a method of producing a metallic carrier with a coating for the anchoring of the reactive oxide layer or of the catalytically acting material.