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The point temperature and the total uncertainty are 40.80±0.03 of the positive ten alcohol pool 37.27±0.04 phenol pool. The difference between the two measurements is less than the difference between the two measurements. The difference between the maximum temperature of each well tube is less than 7; The temperature of each well tube is uniform. The actual test and verification results of the thermometer are completely used, so that the new calibration device as a thermometer can be directly applied to fields such as medical bioengineering.
4 seasons can wait. A new mode of temperature measurement. Metrology technology. 29 gas seal inspection device Zhou Baowei Guiyang Yongjiang Instrument Factory, Guiyang City, 550005 gas holding state, all immersed in water to observe whether there are bubbles appear or observe whether the parallel pressure gauge is depressurized, etc., low efficiency and small leakage Gas is not easy to find. The presence or absence of air bubbles in the glass bubble leak detector in the gas path is used to determine the sealing property of the gas by using a leak or a pressure drop, and the input is small and easy to operate, and is intuitive and reliable.
Principle Gas sealability is a key item in product inspection, which directly affects the safety of the user and the property. Many materials have published a variety of effective inspection methods, but they are primitive or imperfect. If it is immersed in water, the work is difficult and strong, and the hidden leakage is not easy to find, and the product is inevitably immersed in water. In addition, it is difficult to see the fine leakage on the pressure gauge. The bubble leak detector can be used to visually and accurately determine the gas tightness. This paper mainly introduces the principle and device design of using gas leak detector to check gas tightness.
Start, the two split cocks are closed. During the inspection, the main cock is closed, and the two sub-plugs, the start-up, and the regulated gas source will replenish the leaked gas to maintain the balance, thereby generating a gas flow. When the gas flows through the liquid surface, obvious bubbles appear, so that it can be judged. Gas tightness.
According to the technical requirements of the gas, adjust the pressure of the gas source used for the test. Check the tightness of the system after the pressure is constant.
The method is to use the plug or the gas that is only sure to not leak for the first test, and observe that there is no bubble or liquid sucking in the glass bubble leak detector.
After passing the inspection, the instrument referred to as the glass bubble leak detector is connected to the gas path, and the air outlet is closed, and the main cock of 1 is pressed to pressurize the instrument. After about 5 seconds, the two split cocks are opened and the main cock is closed to hold the pressure. Observe for about 3 minutes, if the right spigot of the main cock is pressure drop due to leakage of the instrument, then the steady-state gas source at the left end of the main cock will inevitably flow through the glass bubble leak detector through the turret 1 and then be supplemented by the scammer 2 Go to the instrument to maintain balance. The electrical control inspection process of the gas flowing through the glass leak detector is illustrated by the above principle. The electrical control mechanism can be simply set up to complete the cyclic working process. The two main cocks and the inlet and outlet 1 joints are used as JJ controlled components, and the electric control system and the air control mechanism can be completed. According to this control process, the control process 2 can be set up by using an Electromagnetic relay or the like, which is omitted here.
Mechanical Control Design According to Principle 1, the device contains a gas valve or two passes. Pressurized state of non-working status and work. + The cock is always welcoming and the two cocks must be broken. The state of holding pressure is the opposite of the end. The main cock is closed and the two cocks are closed. Delay, time 5 seconds is not high.
The holding time can also be controlled manually. According to the principle working process and the above analysis. Design a combined valve with one valve and two called pass-through requirements. Competition 3. The position is in a pressure holding state.
The work is done by manually operating the spool for 90 rotations.
The computer signal amplifies the negative pressure, and the U.S. test can be seen that the computer sampling and processing can finally accurately and intuitively reflect the instrumentalism, and the partial situation can also reflect the break.
Computer sampling is judged in the above device. Replace the glass bubble leak detector with a differential pressure sensor. The signal to be read according to the variation. Enter the computer to zoom in. Then convert it into Luzhu or spectrum to reveal the leak. Using the unregulated air source pressure minus the difference between the pressures that have been applied to the instrument, as the sampling signal of the computer, the control process is 4.
The erroneous judgment caused by the negative pressure caused by the smashing of the sputum itself can be based on the electromagnetic relay.
Agrochemical Intermediates,CAS 7446-70-0,Vitamin H,Hight Purity Dimethyldichlorosilane
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