Mercury sphygmomanometer should maintain a calibration frequency of once a year, the calibration method is to open the mercury sphygmomanometer switch, if the mercury at 0 point, or open the switch gradually tilt the mercury uninterrupted to reach 180mmHg or more, it shows that the mercury sphygmomanometer is standard. Mercury is highly toxic and cannot be disassembled and repaired by itself. If the mercury sphygmomanometer 0 inaccuracy, the mercury column bubbles or intermittent failure should not be disassembled by themselves, should immediately stop using, send professional maintenance department repair, in the use of mercury sphygmomanometer to pay attention to the following points: 1, smooth the rubber skin tube to prevent the emergence of knots, tangles, etc., to keep the air path smooth. 2, open the mercury pot after the water level to reach the 0 level line, if less than must be sent to repair. This situation is due to the amount of mercury is not enough to cause inaccurate measurement results, the consequences of mercury stratification or even spattering out. 3, when the mercury level rises to a higher position, be sure to slow down the pumping speed to prevent for some reason caused by the liquid level shock and mercury spattering. 4, if you find that the pumping so that the liquid level stops rising, be sure to stop pumping, check whether the air path is smooth. 5, do not raise the mercury to the highest, to meet the Remember to tilt at least 45 degrees to the right after use and close the switch when the mercury is diverted back to the mercury pot. 7, once the mercury leaks out remember to immediately sprinkle a large amount of sulfur powder to oxidize the mercury to mercury sulfide.