Application of Externally Sticking Liquid Level Switch in Ammonia Tank Field

High and low liquid level alarm In the process of renovation of old tank farms, there are common problems such as difficulty in opening the tank body, and long labor hours for tank cleaning. The externally measured liquid level switch is installed on the outer wall of the tested tank. Compared with the traditional liquid level switch, it is not in contact with the liquid medium to be tested, and has strong anti-interference ability. It can be installed and used; it is convenient and safe to install and maintain, and it is an ideal measurement method in liquid level measurement. This article describes a successful case of using an externally-measured liquid level switch to monitor liquid level alarms in a technology company in Huizhou. The storage tank shall be equipped with a liquid level monitor, and shall have the function of high and low liquid level alarm; the pressure storage tank of dangerous chemicals shall be equipped with a high and high liquid level monitoring alarm and interlocking control system. In accordance with the requirements of the regulations, combined with the actual situation of a technology company in Huizhou, the factory has upgraded the a ammonia water storage tank area. In order to further improve the monitoring and monitoring facilities of the chemical tank farm, the high and low liquid level alarms of the storage tank are set up according to the specification requirements, and the automatic interlocking alarm function of the ultra-high liquid level is adopted. First of all, the magnetic flap level gauge used in the ammonia water tank in the tank area has a single measurement method and cannot meet the requirements of the alarm and interlocking control system. During the transformation of the tank area, it is necessary to install a liquid level switch alarm device to transmit relay signals. Form an interlock to the core control system. Secondly, when adding liquid level switches in the old tank area, the traditional intrusive, buoyancy, pressure, capacitive, and tuning fork liquid level switches need to be opened in contact with the medium, and it is difficult to open holes in the old tanks in the oil tank area. Tank cleaning is labor-intensive and has the potential for leaks, which is neither economical nor safe. 1. The principle and advantages and disadvantages of the external measurement type liquid level switch: 1.1. The working principle of the external measurement type liquid level switch: the measuring probe of the external measurement type liquid level switch is installed on the outer wall of the container, which belongs to a kind of liquid level detection from the outside of the tank. The complete non-contact detection instrument. The measuring probe of the instrument emits ultrasonic waves and detects its after-vibration signal in the container wall. When the liquid flows over the probe, the amplitude of the after-vibration signal will become smaller, and a switch signal will be output after this change is detected by the instrument. 1.2. Advantages of the external measurement type level switch: Compared with the traditional liquid level switch, the measurement method of the external measurement type liquid level switch does not contact the medium, so that it is not affected by the pressure, temperature and corrosiveness of the medium. While the measurement accuracy is high, there is no need to open holes on the tank body, no hot work, low installation cost, convenient maintenance, and it can be installed, maintained and used without stopping production, realizing non-contact measurement control in the true sense. It has a wide range of applications and can be used for various complex working conditions such as highly toxic, highly corrosive, high pressure, and various liquid media measurements in explosive gas environments. The external measurement type liquid level switch uses sound waves to monitor the height of the liquid level in the container, and realizes high and low alarm functions, with high precision and sensitive response; it can be automatically corrected without adjustment, and at the same time, the output relay signal can be connected to the system, By changing the running state of the pump start/stop, the chain alarm and automatic control functions are realized. In addition, the external measurement type level switch has no moving parts. Therefore, almost no wear can be achieved, and the service life is relatively long. 1.3. Disadvantages of the externally measured liquid level switch: At present, the externally measured liquid level switch is suitable for storage tanks with dense materials such as metal, plastic, glass, etc., and is not applicable when the tank body is made of non-hard materials. 2. Application of external measurement type liquid level switch: 2.1. Installation: The container wall where the measuring probe is installed should be made of hard materials that can transmit vibration well. If the container wall is made of multi-layer materials, the layers should be in close contact. , No bubbles or gas interlayer, and the inner and outer wall surfaces are flat. Do not use other ultrasonic equipment or electromagnetic equipment nearby, so as to avoid mutual interference between equipment and cause malfunction. The storage tanks to be renovated in the tank area of ​​our factory are non-ferromagnetic storage tanks. Super glue and iron adapters are used to allow strong magnets to attract and fix them. The existing brackets are used to lay cables. There is no need to stop production during installation, and there is no need to clear the tank. Don't use fire. The probe position of the liquid level switch should be as far away from the weld as possible. The externally measured liquid level switch is in good condition in the renovated tank area of ​​our factory, and there is no problem at present. Due to the many advantages of the externally measured liquid level switch, the device has become more and more mature in the application of tank farm renovation projects, the function of storage tank liquid level alarm detection has become increasingly perfect, and the measurement accuracy has become higher and higher. Successful tank farm reconstruction project cases Also more and more. The on-site practical application after the renovation of the old tank area of ​​our factory shows that the external measurement type liquid level switch is simple to install, easy to operate, strong in anti-interference, small in maintenance workload and high in safety performance. As an ideal non-contact new liquid level alarm instrument, the external measurement liquid level switch can better realize the low and low liquid level alarm, which not only ensures the safety of the liquid level of the storage tank, but also reduces the maintenance workload and eliminates the need for The safety hazard of open fire in the transformation of the tank farm,It can be widely used in the measurement of liquid level alarm occasions in harsh environments in the petrochemical industry. Liquid level switch | Externally mounted liquid level switch
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