Possible fields of application
Thermometer for use in applications exposed to strong vibrations, e.g. on large diesel engines. The glass insert is glued into a nickel-plated steel tube and this is spring-mounted in the housing. Highest separation resistance possible. Available in Type 271 BF and 291 BF, display ranges 0 ... 100 ° C and 0 ... 600 ° C.
Nominal dimensions 150 and 200 mm, aluminum, V-shaped, fully polished, anodized gold (or silver on request). Reading scale numbers printed on the right side. Print in black for easy readability. Straight types adjustable to any desired viewing position and locked with a brass nut, key size 22.
Glass inserts (capillaries)
Solid glass capillary tube, bar-shaped, prismatic (optical enlargement of the column, except for high temperature types), diameter approx. 8 mm, oval opening, with yellow background for mercury * and white background for blue fluid column. The scale is deeply burnt in black, which gives it absolute resistance. The main graduations, which correspond to the impression on the case, are particularly well defined.
For display range 0 ... 120 ° C blue thermometric fluid ("Fü"); for display ranges starting at 0 ... 300 ° C, only mercury filling is technically possible.
Standard steel version. The diameter of the type “B” dip tube is 12 mm; the wall thickness 1,5 mm.