Mass flow controllers should pay attention to these small details when using

The mass flow controller uses the temperature difference between the upstream and downstream of the capillary generated by the gas flow through the capillary to detect and control the gas mass flow. Unlike positive displacement flow meters or flow controllers, its flow accuracy is not affected by gas pressure and ambient temperature. Since the temperature difference between upstream and downstream always reflects the instantaneous flow of gas flow in real time, it is especially suitable for accurate measurement and control of gas flow in process control. This product has two functions of flow measurement and flow control. Generally, when the MFC or MFM is connected to the power line, it can ensure the stability of the ambient temperature, and preheating for more than 15 minutes can effectively ensure the accuracy and stability of the product. During installation, the airflow direction is indicated under a large label on the back of the MFC or MFM. When using mass flow controllers, you should pay attention to these small details: 1. The success of the application of the flow controller is directly related to the installation of the flow controller. In addition to the normal installation requirements, special attention should be paid to reducing the impact of vibration, because the flow controller is based on the principle of vibration, and external vibration will introduce interference. However, minimizing external interference is undoubtedly conducive to accurate measurement, so vibrations in pipelines and the site environment should be avoided as much as possible. 2. During the use of the instrument, it is necessary to carry out accurate zero point calibration under the conditions of use. The flow controller is a high-accuracy measuring instrument used online. The drift of the zero point will affect the measurement results. It must be calibrated regularly during long-term use. 3. Be sure to avoid situations beyond the use range of the flow controller, which will lead to a decrease in the measurement accuracy of the instrument and even cause damage to the instrument. For example, due to steam purging operations outside the temperature range of the instrument, the sense coil can be damaged and the instrument cannot be used again. 4. The flow controller has high accuracy, but we also need to carefully maintain it, such as equipping it with a high-quality regulated power supply, and regularly checking the vibration and operating conditions on the spot, etc., to ensure the accuracy and the stability of the instrument. Safety. 5. When using the mass flow controller at ordinary times, it is necessary to prevent artificial power failure and disconnection.

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