Q:How to use the car fuel pressure gauge?

Usage method：(1) start the engine and switch to the normal operating temperature, turn off the engine, and then remove all the spark plugs when the engine is stopped;(2) the solar term valve is fully opened, the pressure gauge connecting head is pressed on the spark plug on;(3) use a motor to rotate the engine at 100 150r / min speed for 3 to 5 seconds. At this point, the pointer on the instrument will gradually rise, to a certain value that will stop, at this point the indicator value is the compression pressure of the cylinder;(4) press the button to make the pointer zero;(5) repeat the measurement 2~3 times according to the above procedures to improve the measurement accuracy.(6) general car cylinder pressure >0.9MPa and delta <8% (pressure of each cylinder, gasoline engine cylinder average pressure of not more than 8%).If the measured value is smaller than the specified value, and the intake system is normal, it can show that the cylinder and piston, cylinder head leakage, the original cylinder, piston, valve, piston ring wear, ablation and other undesirable situation. If the measured value is greater than the specified value, and the intake and exhaust system is normal, the possible cause is the serious carbon deposition in the combustion chamber.

Q:Where is the safety valve and pressure gauge for the gas tank?

The safety valves go to the local Quality Supervision Bureau at the municipal level, and they will designate a place for you to check.Pressure gauge local measuring instruments inspection qualification institutions, general provincial and municipal metering Inspection Institute on the line.

Q:How does the air conditioning pressure gauge add readings?

The scale on the meter is pressure. Through the pressure display, you can know the exhaust pressure of the compressor (high pressure) and the inlet pressure (low pressure), and judge whether the system is running properly, such as system congestion, refrigerant leakage and other faultsThere should be MPa (Zhao Pa) and bar (bar) on the table, which is the common pressure unit in china,0.1MPa = 1bar = 1 kg / cm2, kg / cm2 - this unit is not a statutory measure of the country and is not marked on the table, but we use it more orallyTake the common R22 refrigerant as an example, according to the different environment temperature, when the refrigeration system is working normally, the low voltage is generally at 3^6bar, and the high voltage is usually at 10^25bar.

Q:The pressure gauge joint diameter is 21, 14 teeth per inch. What does it mean?

The number of teeth 14 teeth, thread big diameter 21 of the thread, usually G1/2, ZG1/2 or 1/2NPTIf your thread doesn't taper, that's G1/2.If there is taper, it may be ZG1/2 or 1/2NPT.. These two threads are easy to be confused and have to be measured carefully to distinguish them

Q:What's on the pressure gauge or something on the barometer? Which one told me?

Bar means stainless steelPSE I don't know what that means

Q:What are the common measuring ranges of pressure gauges?

0.25mp, 0.6mp, 1.0mp, 1.6mp, 2.0MP, 2.5MP and so on. In order to ensure that the elastic element can work reliably in the safety range of the elastic deformation, the pressure gauge range is selected not only according to the measured pressure, but also should consider the measured pressure change rate, the range need to leave enough room for. When measuring the steady pressure, the maximum working pressure shall not exceed 2/3 of the measuring range; the pulsating pressure shall be measured; the maximum working pressure shall not exceed 1/2 of the measuring range; when measuring the high pressure, the maximum working pressure shall not exceed the 3/5 of the measuring range. In order to ensure the accuracy of measurement, the minimum operating pressure should not be less than 1/3 of the measuring range. According to this principle, according to the measured maximum pressure to calculate a value, from the pressure gauge product catalog select a little larger than the measurement range.The pressure gauge is divided into vacuum meter, pressure vacuum meter, micro pressure meter, low pressure meter, middle pressure meter and high voltage meter according to its measuring range. Used to measure the atmospheric pressure is less than the pressure value of the vacuum gauge; pressure vacuum gauge used to measure the atmospheric pressure is larger than the pressure value; micro pressure gauge for measuring the pressure value is less than 60000 Pa; low voltage meter for measuring 0~6MPa value of pressure; pressure meter for measuring 10~60MPa value of pressure; pressure gauge for measuring the pressure value of more than 100MPa.

Q:The water pump's pressure gauge has 3 hands. What are they respectively?

The pump pressure gauge has 3 hands, the pressure gauge should be electric contact pressure gauge. A needle is indicative of the pressure gauge pressure and electric contact point is a public, upper limit of electrical contacts, for the limit of the alarm or control, one is the lower limit of contact for alarm or control.

Q:What is the calibration cycle for the pressure gauge / thermometer / flowmeter? Is there a standard to check?

According to the standard, it is the national measurement technical standard JJF 1139-2005, "the principles and methods for determining the verification cycle of measuring instruments".In fact, as a measuring instrument, it is impossible for users to determine the inspection cycle according to their specifications.At the same time, the manufacturer has already made the product according to the specifications and determined the inspection cycle, and the cycle can meet a certain requirement.For industrial metering equipment, this cycle is generally not less than one year.So:It is usually tested once a year.If the product specification requires that the cycle be less than one year, proceed as required.If the quality of the product is reliable, it can be done once or twice a year for two times, but the exception of the pressure gauge and the strong inspection equipment is three.Equipment cycles for fire, gas, gas, alarm, etc. shall be specially determined.

Q:What is the thread diameter of the pressure gauge 10cm?

Look, are you a pipe or a straight thread?.

Q:What are the precision grades of precision pressure gauges in our country?

Search Beijing Wantong to ring high precision pressure gauge absolute contact said Baidu know I saw Zhang