Small make up teach you how to test the bimetallic thermometer

To introduce how to test below bimetallic thermometer: one, the accuracy of inspection: take a range of 0 ~ 25%, 26% ~ 75%, 76 ~ 100% of a bit, the margin of error is: under 250 ℃ & plusmn; 1%,250 ~ 300℃± 1. 5%, more than 300 ℃ & plusmn; 2%. If you have special requirements, according to the requirements shall prevail. Second, the visual inspection bimetallic thermometer visible parts to no obvious flaw, scratched or damaged. Three, table CARDS inspection: for printing quality: scale of table board, trademark printing content must be complete, clear and color. Four, structure inspection: the bimetallic thermometer pointer must not have paint tumor, burr; Joint thread must not have crack, collapse, ground bald and sliding tooth phenomenon; Table should maintain a transparent light, no oil, scratches. If you have waterproof requirement, should be placed in water, no leakage. If is oil filled, filling and filling in the table of the liquid to be transparent, without impurities or debris, clean a height should be located in the heart of the case above 0. 25 d ~ 0。 3 d ( D for meter diameter) And, in 60 ℃ heating and constant temperature box, no leakage phenomenon. Bimetallic thermometer is a round shape into threaded heat bimetallic strip as thermal devices, and put it in a protective sleeve tube, one end is fixed, known as the fixed end, the other end of the connection on a thin shaft, a free end. Spool at the free end is equipped with a pointer. When the temperature changes, the resulting thermal devices the free end of the rotation, drive the thin axis from the Angle of the pointer changes, corresponding temperature indicator on the dial.