Glass mercury thermometer some technical requirements

Mercury thermometer when making some technical requirements, give you a brief introduce. Say first thermal fluid and fluid column, to ensure that the mercury and mercury alloy must be pure, dry and no bubble, and liquid column section shall not be broken; Mercury in - base alloy Shall not be frozen when 60 ℃. To ensure thermal liquid level changes with the temperature rises, there will be no obvious stagnant or jumping phenomenon; After the liquid drop no mark on the pipe wall with fluid. Again dial with logo, first, the glass rod on the mercury thermometer calibration scale line, referred to as 'scribed line, should with the capillary vertical centerline. Observing temperature on the front and stick all the scribed line and temperature digital thermometer should be projected in the glaze with range. And to ensure that the internal standard capillary thermometer should tighten in the middle of the scale plate position, relative lateral displacement shall not exceed the shortest scribed line, capillary with scale plate spacing shall not be greater than 1 mm. Second, the ruling should be uniform, two adjacent scribed line spacing shall not be less than zero. 5 mm, the width of the scribed line shall be no more than two adjacent scribed line spacing of ten points. Third, digital, scribed line shall be clear and complete color should be solid don't fall off. The thermometer should be 2 ℃ every id number. On, lower limit, and zero outside the scribed line shall be ten exhibition scribed line. Fourth, mercury thermometer glass rod should have the following sign: according to the international practical temperature scale & other; C & throughout; The symbols & other; ℃” , the manufacturer or factory and manufacturing month, number, etc. The above introduction, believe everybody on the production of glass mercury thermometer have a deeper understanding.