How to switch Omron mmhg and kpa on sphygmomanometer?

The switch between sphygmomanometer mmHg and kpa depends on the model.

The conversion process of sphygmomanometer mmHg and KPa, according to the formula pressure p = f/s = mg/s = rhosh * g/s = rhogh, h = p/rhog?

The density of mercury (Hg) ρ = 13.59g/cm 3 and g=9.8N/kg, so the pressure of 1mmHg is:

1mmhg= 13.59g/cm^3x9.8n/kgx 1mm= 13.59x 1000kg/m^3x9.8n/kgx0.00 1m

= 133. 182n/m^2= 133. 182pa=0. 133kpa。

Some models of sphygmomanometers cannot be switched. If it can be switched, you can switch to the KPa unit as long as you press the switch button after shutdown. Conversely, the same operation.

1mmHg= 133。 2Pa=0. 133kpa、 1kPa=7.5mmHg。 The default pressure unit of Omron sphygmomanometer factory design is: mmHg, which is not the national standard unit, but Pascal.

Extended data:

Matters needing attention in using sphygmomanometer:

1. Due to the direction of blood flow, the blood pressure measured by the left hand and the right hand is usually somewhat different; Usually, the blood pressure of the left hand is slightly higher than that of the right hand, but the difference of 10~20mmHg is normal. However, the high measured data shall prevail when recording. If the difference between hands is more than 40 ~ 50mmhg, it may be blood vessel blockage. It is best to consult a doctor to find out the reason.

2, don't just count your blood pressure once, measure your blood pressure several times a day and record it, so that you can understand the changes in your blood pressure in one day.

3. Most sphygmomanometers on the market are mainly electronic, and their measurement results are usually slightly higher than those of traditional mercury sphygmomanometers. Electronic sphygmomanometer is divided into wrist type and arm type. Although the wrist type is more convenient to use, it is usually far from the heart, and the measurement results are more different. It can be tested on the spot when purchasing. If there is little difference between the results measured by arm type and wrist type, both can be used. If there is a big difference, it is better to choose the arm type.

4, mercury sphygmomanometer before and after use, medical staff should always pay attention to check blood pressure, keep the scale clear, pipe string should be cleaned regularly with a stick, and there can be no bubbles when the pressure is about 200 mmgH. If bubbles appear during pressurization, stop pressurization for inspection and maintenance.

It's best to take blood pressure when relaxing in your own home, because some people feel nervous when taking blood pressure in medical institutions, which leads to an increase in blood pressure. Medically called "white hypertension", measuring blood pressure at home can overcome this situation.

6, the traditional mercury sphygmomanometer will be affected by thermal expansion and contraction, and the average zero position should be calibrated once every six months.

7. The electronic sphygmomanometer will be affected by the aging of components, and it needs to be calibrated once a year on average.