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[ Focus on Chemical Machinery and Equipment Network ] In daily life, measurement is ubiquitous.
Why does the water meter switch when it is not using water? Does the new meter "go faster" than the original meter? When the fuel tank is full, the displayed value always exceeds the rated capacity? Whether the home sphygmomanometer is allowed.
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Chemical machinery and equipment network hotspots pay attention to chemical machinery and equipmentWhy does the water meter switch when it is not using water? Does the new meter "go faster" than the original meter? When the fuel tank is full, the displayed value always exceeds the rated capacity? Whether the home sphygmomanometer is allowed.
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Come take a look, how much do you know about life tips related to measurement.
Q: Why does the water meter switch when not using water?
A: First, observe how the pointer of the water meter turns.
In the case of not using water, if it is continuously and evenly rotated in one direction, it can be judged as a water leak.
If the pointer of the water meter stops or turns back and forth, it can be preliminarily determined that there is air remaining in the pipe, and water flows when the water pressure fluctuates, causing the pointer to rotate slowly.
Therefore, if you do not use water for a long time, you should close the main tap water valve as much as possible to completely cut off the water source.
In the case of not using water, if it is continuously and evenly rotated in one direction, it can be judged as a water leak.
If the pointer of the water meter stops or turns back and forth, it can be preliminarily determined that there is air remaining in the pipe, and water flows when the water pressure fluctuates, causing the pointer to rotate slowly.
Therefore, if you do not use water for a long time, you should close the main tap water valve as much as possible to completely cut off the water source.
Q: After replacing the new meter, does the meter "go faster" than the original one? Is it using more electricity than before?
A: This is not because the newly installed meter is running fast or inaccurate, but because the old meter is limited by the technology and material, and after long-term use, the sensitivity decreases after wear and dirt blockage.
The newly installed electric meter has high sensitivity and accurate measurement, even the small amount of electricity such as standby power consumption can be accurately measured, so it gives people the illusion that the new meter "goes fast".
The newly installed electric meter has high sensitivity and accurate measurement, even the small amount of electricity such as standby power consumption can be accurately measured, so it gives people the illusion that the new meter "goes fast".
Q: Why does the displayed value always exceed the rated capacity when the fuel tank is full? Is the fuel dispenser "silly"?
A: Due to the volatility and expansion of gasoline, according to the national mandatory standards, the rated capacity of the fuel tank should be controlled at 95% of the maximum actual capacity of the fuel tank (some manufacturers 90% or 80%), and does not include the secondary fuel tank The capacity of the section of tubing to the fuel filler and the section of tubing from the engine to the bottom of the tank.
Therefore, a fuel tank with a nominal rated capacity of 50 liters can hold up to 60 liters of gasoline.
Therefore, consumers are advised not to fill the fuel tank too full for the sake of driving safety, just fill up to the rated capacity.
Therefore, a fuel tank with a nominal rated capacity of 50 liters can hold up to 60 liters of gasoline.
Therefore, consumers are advised not to fill the fuel tank too full for the sake of driving safety, just fill up to the rated capacity.
Q: What should I pay attention to when refueling?
A: Before refueling, please check the oil product information on the display of the dispenser.
Except for the unit price display, all other displays should be zero.
After refueling, please pay attention to verify the quantity and amount of refueling in time, and ask for an invoice.
Except for the unit price display, all other displays should be zero.
After refueling, please pay attention to verify the quantity and amount of refueling in time, and ask for an invoice.
Q: There are many instruments for measuring body temperature at home.
Which one of infrared thermometers, mercury thermometers or electronic thermometers is more accurate?
Which one of infrared thermometers, mercury thermometers or electronic thermometers is more accurate?
A: Each of these three instruments has its own advantages.
Infrared thermometers are simple and easy to operate, but are greatly affected by the external environment; electronic thermometers have clear readings, easy to carry, and short measurement time, but the accuracy of the indication is affected by factors such as electronic components and battery power supply status; mercury thermometers have high temperature measurement stability, But it takes a long time and the mercury leakage is more harmful.
In terms of measurement accuracy, mercury clinical thermometers have better measurement performance, but special attention should be paid to the safety of use.
Electronic componentInfrared thermometers are simple and easy to operate, but are greatly affected by the external environment; electronic thermometers have clear readings, easy to carry, and short measurement time, but the accuracy of the indication is affected by factors such as electronic components and battery power supply status; mercury thermometers have high temperature measurement stability, But it takes a long time and the mercury leakage is more harmful.
In terms of measurement accuracy, mercury clinical thermometers have better measurement performance, but special attention should be paid to the safety of use.
Q: Is the home sphygmomanometer accurate? What are the precautions when using?
A: Electronic sphygmomanometers are very common in households because of their simple use and convenient measurement.
But how accurate is the measurement result? The following points should be noted:
But how accurate is the measurement result? The following points should be noted:
1.
Go to a regular medical device store to buy, and choose products that meet the national medical device access standards.
Go to a regular medical device store to buy, and choose products that meet the national medical device access standards.
2.
Correct use: (1) Before measuring blood pressure, you should rest for 10-15 minutes.
You can take 3-4 deep breaths to eliminate fatigue and tension.
(2) When using an arm-type electronic blood pressure monitor, it should be noted that the cuff height is at the same height as the heart position.
The lower edge of the cuff is about 2cm away from the elbow socket, with moderate elasticity.
(3) The sitting posture is correct, the body is relaxed, do not speak, and the elbows cannot leave the desk.
Correct use: (1) Before measuring blood pressure, you should rest for 10-15 minutes.
You can take 3-4 deep breaths to eliminate fatigue and tension.
(2) When using an arm-type electronic blood pressure monitor, it should be noted that the cuff height is at the same height as the heart position.
The lower edge of the cuff is about 2cm away from the elbow socket, with moderate elasticity.
(3) The sitting posture is correct, the body is relaxed, do not speak, and the elbows cannot leave the desk.
3.
Household sphygmomanometers need to be calibrated regularly, and you can consult the local measurement agency.
Household sphygmomanometers need to be calibrated regularly, and you can consult the local measurement agency.
Q: Why are some blood glucose meters inaccurate? How to ensure the accuracy of the results when using?
A: Part of the reason for the inaccurate self-test blood glucose at home is the incorrect measurement method or improper storage of the test strips.
There is also the inaccurate measurement of the blood glucose meter itself.
There is also the inaccurate measurement of the blood glucose meter itself.
In order to ensure the accuracy of the measurement results, it should be noted that the test strips of the blood glucose meter cannot be used after the expiration date; the blood glucose test strips of various types of blood glucose meters cannot be used interchangeably.
Original title: 520 World Metrology Day
