The ECG machine can be divided into single channel and multi-channels (e.g., three, six, and twelve) according to a recorded signal derivative.For 1 Channel ECG, there is only one way to channel the ECG signal, and the waveform of each guide should be recorded one by one. That is, it does not reflect the changes in the conductors at the same time. There are many channels for the large channel of the multi-channel electrocardiogram machine, such as the six-way electrocardiogram machine, which has a six-way amplifier, which can reflect the simultaneous changes of the electrocardiogram of the six conductors at a certain time.
Whether you need a mobile, 3-channel ECG machine, 6-channel ECG machine, 12-channel PC ECG, you will find the proper ECG monitor for your needs in this category.
The compatible ECG electrodes, ECG paper and Ultrasound gel also can be found in this category.
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The purpose of using a steam boiler is to generate steam for heating, but when the steam boiler produces steam, it should not be left out of the equipment, or pay more attention, because the steam boiler will start to pressurize at the same time. The saturation temperature of the water has also begun to increase.
As the temperature of the water in the steam boiler rises continuously, the temperature of the metal wall of the bubble and the evaporation heating surface also starts to rise at any time. It is necessary to pay attention to the temperature of thermal expansion and thermal stress. Since the wall thickness of the bubble is relatively thick, the zui in the heating process of the boiler The main problem is thermal stress.
At the same time, it is also necessary to consider the overall thermal expansion problem, especially for the steam heating surface of the steam boiler. Because of the thin wall thickness and long length, the problem in the heating process is the overall thermal expansion, and also pay attention to its thermal stress to prevent the cause. Neglect and cause a malfunction.
In the steam boiler steam generation and temperature rise and pressure process, the bubble has a temperature difference along the wall thickness and the temperature difference between the upper and lower walls, the inner wall temperature is higher than the outer wall temperature, and the upper wall temperature is higher than the lower case, in order to prevent excessive Thermal stress must be slowly boosted by the boiler.
In the process of ignition and boosting of the steam boiler, the steam parameters of the boiler, the water level and the working conditions of the various components are also constantly changing. Therefore, in order to effectively prevent abnormal situations and other dangerous accidents, we must arrange professional staff to closely monitor changes in various instrument indications.
By adjusting the control pressure, temperature, water level and other process parameters within the normal allowable range, it is also necessary to assess the reliability and safety of various instruments, valves and other components, so as to fully ensure the safe and stable operation of the steam boiler. .
The higher the pressure of the steam boiler, the higher the energy consumption, and the corresponding pressures of the steam equipment and the piping and valves will also increase, which will also increase the protection and maintenance requirements of the steam boiler. The proportion of generated steam that is dissipated and lost during production and transportation will also increase. The salt content of high-pressure steam will increase with the increase of air pressure. These salts will cause structural phenomena in the heated area such as water wall tubes, smoke pipes and drums, resulting in overheating, foaming, blockage, etc., which can lead to pipeline explosion in severe cases. Wait for dangerous accidents.