Using bimetallic thermometer should pay attention to what issues?

Bimetallic thermometer is a measurement of low temperature field testing instrument. Bimetallic thermometer can be directly measured in the process of various production - 50 ℃ ~ + 500 ℃ within the scope of liquid, steam and gas medium temperature. The use of widely used in industrial equipment. Use the bimetallic thermometer should pay attention to what issues? Instrument according to the accumulated before, we summarized the following five using bimetallic thermometer note: A, bimetallic thermometer protecting tube immersed in the measured medium length must be greater than the length of the thermal components, immersed in length is more than 40 mm, 0 50 ℃ range is greater than 50 mm in length, so as to ensure the accuracy of measurement. B, all kinds of bimetallic thermometer should not be used to measure open containers within the medium temperature, electric contact thermometer should not be at work used in the control circuit of larger vibration occasions. C, bimetallic thermometer in custody, use the installation and transportation, should avoid collision protection tube, do not make the protection tube bending variant and the table when the spanner is used. D, thermometer in the case of normal use shall be regular inspection. Is every six months. Electric contact thermometer is not allowed to work under strong shock, so as not to affect the reliability of the contact. E, the temperature of the instrument often work better in the scale range of 1/3 to 2/3.