Common faults:
I. Mercury leakage?
(A) the cause?
1. After use, forget to close the switch to the mercury storage tank, so that the switch is not in the "on" position, so close the sphygmomanometer, the mercury will naturally flow out of the top of the glass tube.
2. The operator exerts too much force during use, causing the mercury to overflow from the filter; or pressurizes the device before switching it on and off, causing the mercury to bubble out of the filter.
3. The mercury pot is used for a long time, and the screw at the switch is loose, leaking mercury.
4. The rubber pad between the mercury pot and the glass tube deteriorates or is not put in place when it is replaced, resulting in a gap and causing the mercury to leak.
(2) repair method?
1. If the sphygmomanometer mercury leakage phenomenon, can not be collected directly after the mercury poured into the garbage can or flushed into the sewer, because the toxicity of mercury has a long latent period of several decades. If the mercury once leaked, it should be promptly covered with sulfur powder on the surface of the mercury, mercury and sulfur chemical reaction, generating non-toxic and water-soluble salt mercury sulfide, at this time the mercury can be poured into the garbage can or flushed into the sewer.
2. Check the switch, if loose then tighten. Check the rubber pad for aging damage, such as aging damage in time to replace and adjust the position.?
3. After the mercury column returns to zero, tilt the sphygmomanometer slightly and turn off the switch after all the mercury liquid flows into the storage tank. If there is mercury overflow, add mercury in time, and adjust to the measurement of qualified.
Two, the mercury sensitivity is low?
(a) the cause?
1. Mercury in the oxidation of mercury oxide generated by the dirty wall of the tube, hindering the rise and fall of the mercury column, resulting in reduced sensitivity.
2. Glass tube on the upper end of the vent is dust, mercuric oxide and other dirt blocked, resulting in bad ventilation, the mercury column rise and fall stagnant affecting the accurate reading.
(2) repair method?
1. Remove the glass tube, with alcohol, degreasing cotton wool, brush and other chamois and filter clean, so that the ventilation is good, while achieving the sealing requirements.
2. Check the inner wall of the glass tube whether there is dirt, there is a replacement of the glass tube, you can repair the above problems.?
Three, leakage of mercury leakage, balloon pumping powerless or laborious?
Repair method?
1. First check whether the hose connection aging, intact, broken. If the aging damage in the far end of the gas bag on the hose, in the case of not affecting the use of the hose, you can cut off the broken aging leakage of the hose. If it is close to the proximal end of the gas bag, the gas bag should be replaced.?
2. Connect the hose connector, tighten the front valve switch pinch the balloon to see if there is any air leakage, such as air leakage , you should tighten the front valve switch first.
3. The whole sphygmomanometer from the storage tank and the airbag in the middle of the excessive separation, respectively, with the precision blood pressure table connection, pressurized to 32KPa near the observation of the precision blood pressure table pointer has a small amount of movement, due to the precision blood pressure table scale is fine, as long as there is a leakage of air can be seen in a small amount of movement of the pointer, so that you can check the section, and ultimately find out where the leak. If there is no precision blood pressure table in use, the simple method is: prepare a basin of water, the sphygmomanometer up to 32KPa near the whole sphygmomanometer immediately placed in the water, to observe whether there are bubbles, to find out where the leaks, and then immediately replaced can solve the problem of poor airtightness, air leakage.
4. If the rubber ball unit leakage, rubber valve leakage, the rubber ball can be separated from the exhaust valve; screw buckle screwing type, after unscrewing can see a small section of similar to the bicycle tire valve core of the rubber tube; remove the type, remove the ball, you can also take out a section of the valve core from the exhaust valve, rubbing the finger this rubber tube, can be found on each side of the gap, if the lint filled room. The fissure has lint filling chamber pressurization, when you release the leather ball, the fissure can not be closed, just hit the mercury column will come down again, clean up the fissure in the dirt, the resulting air leakage problem can be eliminated.
Four, bubbling, mercury column bubble over broken column?
(a) the cause?
1. When the mercury sphygmomanometer pumping will now bubble phenomenon, the reason is due to the storage of mercury bottle wall of mercury oxides and impurities, resulting in the storage of mercury bottle content area becomes smaller, storage of mercury in the bottle of mercury appeared in a long series of bubbles.
2. The broken column of mercury column shows that after pumping the sphygmomanometer, the column of mercury is separated by a section or a few sections of air, and when pumping or deflating, the column of mercury moves up and down parallel to the air section in the middle, and the air section occupies the space of the column of mercury, which results in inaccurate measurement of the value of the blood pressure, and even inability to carry out the measurement.
(2) Repair method?
1. Pour out all the mercury in the mercury storage bottle and replace it with a new one. To out of the mercury with multiple layers of gauze filtration, re-use a small syringe to join the mercury storage bottle, and then use standard measuring instruments for verification and comparison.
2. Found that the mercury column column broken phenomenon, first of all, the glass tube to clean the inner wall, such as still broken column phenomenon can be observed whether the value is accurate. Due to the broken column is accompanied by flow bubbles, so most of the display value will be inaccurate, the display value of the low case, even if the display value is qualified, you can be slightly higher, deflate the mercury column back to the zero position, and then in accordance with the action of the sphygmomanometer off, tilted 45 ° to the right, and at the same time tilted backward 45 °, so that the whole sphygmomanometer only the right corner of the back of the desktop in contact with the switch to turn off the sphygmomanometer. Keeping this angle, tap the tabletop 3-4 times to empty the air brought into the mercury pot due to the injection of mercury, so that the injected mercury can be fully integrated with the original mercury.
Fifth, the zero position is out of alignment?
(a) the cause?
1. The main cause of zero misalignment is the amount of mercury is too high or too low.
2. Poor air permeability of the cap on the bottle, mercury or mercury storage bottle is too dirty.
3. The inner hole channel of the mercury bottle is not smooth.
(2) repair method?
1. Adjust the amount of mercury so that the zero height of the mercury column to reach a qualified, and then check whether the zero position is within the accurate range.
2. Use a needle to wear a few small holes in the mercury storage bottle, filtering mercury, cleaning or replacing the mercury storage bottle.
China's people's livelihood measurement is gradually by the community's general concern, especially in medical institutions, the mandatory verification of measuring instruments more attention. Therefore, there is an urgent need to strengthen the safety of people's livelihood related to the strong inspection of measuring instruments to ensure that the measurement of people's livelihood with strong measurement. This requires us to measure the calibrator in the face of the difficulties encountered in the work of measurement and calibration of the difficulties and problems, can be timely and accurate treatment, we also have only in the actual calibration of the work of the flexible use of theory combined with practice, in order to accurately and quickly troubleshooting.