Magnetic temperature sensor - contains film of specified composition on expanding body varying in permeability and influencing flux in coil

摘要

The temp. sensor has a body (101) whose thermal expansion is evaluated for a temp. change as the expansion influences the magnetic flux in and hence inductance of a coil arrangement, which is related back to the temp. change. A film (102) atomically deposited on the body contains less than 8 weight-per cent phosphor, pref. up to 3 to 2 weight-per cent of an element of the IV or V main group, esp. antimony or lead, and up to 5 weight-per cent of a transition metal element, esp. cobalt or iron, with nickel making up the rest. The permeability of the film varies with the expansion and influences the magnetic flux. ADVANTAGE - Maximum sensitivity is achieved with independence from ambient influences. (Dwg.1/4) 50. Opt., when Monomer Ib has been used, prepn. also comprises (C) swelling particles obtd. by (A) and (B) through converting gps. introduced by means of Monomer Ib through selective chemical conversion into corresp. hydrophilic gps. at temp. above glass transition temp. of polymer of step (A). USE/ADVANTAGE - Aq. colour coating compsns., in industrial applications such as paper coating where they serve as part of binder, replacement of opacifying pigments such as TiO2 and clay in, e.g., phenoplast and aminoplast formulations, partic. contg. urea-HCHO or melamine-HCHO condensation prods., and water-dispersible alkyd resins. (I) are obtd. in more reproducible manner. Films have high opacity. Process avoids incompatibility through polymers of stage (A) and stage (B). (0/0)