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常常发现血压计的玻璃管壁上出现灰色粉末影响读数,这是由于使用日久,即有水银氧化物附着于管壁造成的。可以关闭水银贮槽的开关,提起压板取出玻管,用丝绒通条或纱布、棉花清洁后装上再用。水银柱升降太慢,主要是由于玻璃管顶端的麂皮被水银氧化物或其他杂质堵死不透气造成的。这将会影响血压计的准确性,因麂皮堵死不透气造成玻璃管与大气隔绝,这时所测出的血压就不是高于大气压的
It is often found that the presence of a gray powder on the glass wall of the sphygmomanometer affects the readings due to the long duration of use, ie the attachment of mercury oxide to the tube wall. You can turn off the mercury storage tank switch, lift the platen to remove the glass tube, with velvet through the gauze or gauze, cotton, clean and then re-installed. The mercury column is too slow to lift and is mainly due to the suede at the top of the glass being clogged with gas or other impurities. This will affect the accuracy of the sphygmomanometer, because the suede blocked air impermeable glass tube and the atmosphere isolated, the measured blood pressure is not higher than atmospheric pressure