The choose and buy of oil-extended bimetallic thermometer little common sense

Oil filled bimetallic thermometer is mainly used in the environmental vibration, bimetallic thermometer is the main purpose of the oil filled in order to reduce external vibration environment disturbance to the pointer, achieve the goal of ensure the sensitivity of the thermometer. That the oil is not can choose, oil content are two glycerol and silicone oil. Two kinds of oil have different role, glycerin is mainly the seismic effect; Silicone oil can also have the effect of the seismic, silicone oil is more tolerance for low temperature than glycerol, however, if the outdoor temperature reached minus 20 ℃, glycerin is crystallized, but silicone oil can make the instrument work normally. So glycerol and silicone oil of these two kinds of oil can be used, but in the concrete choice at least when considering the two points: 1, the coefficient of thermal expansion, coefficient as small as possible, this mainly affected by temperature; 2, the use of occasions, the food industry both oil can't use, one thousand damage to diaphragm oil can contaminate food. Also do not recommend using measuring strong oxidizer, otherwise it will cause explosion. Oil filled bimetallic thermometer visible parts to no obvious flaws, scratches or damage. For printing quality, scale of table board, trademark printing content must be complete, clear and color. 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. Table inside the pump oil is transparent, no impurities or debris. Measuring range accuracy to conform to the requirements of the level of the equipment used. Oil filled bimetallic thermometer: the scene display temperature, intuitive and convenient, safe and reliable, long service life and can fast reading.