Measuring principle and advantages and disadvantages of glass tube liquid level gauge

What is the measurement principle of the glass tube level gauge? What are the advantages and disadvantages of glass tube liquid level gauges? The glass tube liquid level gauge is suitable for on-site detection of the liquid position in the liquid storage equipment in the production process. It has a simple structure and accurate measurement. It is a traditional on-site liquid level measurement tool and a direct-reading liquid level measurement instrument. The glass tube liquid level gauge uses the principle of the connector to measure the liquid level in the container. It is composed of glass tube, needle valve and lock nut. + 1. Structural principle of glass tube liquid level gauge The instrument is equipped with M27×1.5 or ZG3/4' threaded joints on the upper and lower valves, which are connected to the container through the flange to form a connector, and the container can be directly read through the glass plate The height of the inner liquid level. The instrument is equipped with steel balls in the upper and lower valves. When the glass plate is damaged due to an accident, the steel ball blocks the passage under the action of the pressure in the container, so that the container is automatically sealed, which can prevent the liquid in the container from continuing to flow out. There is a blocking hole screw at the valve end of the instrument, which can be used for sampling, or for discharging the remaining liquid in the instrument during maintenance. 2. Structural characteristics of glass tube liquid level gauge The upper and lower valves of the glass tube liquid level gauge are equipped with flange joints, which are connected with the container to form a communication device, and the liquid level in the container is directly indicated by the glass tube. Steel balls are installed in the upper and lower valves. When the glass is accidentally broken, the steel balls automatically seal and block the passage under the action of the pressure in the container to prevent the medium in the container from continuing to flow out. The needle valve at the upper end of the instrument is equipped with a stopper screw for venting, and the needle valve at the lower end is also equipped with a stopper screw for venting, sampling, sewage and cleaning. The lower end is equipped with a drain valve for sampling, maintenance, flushing or draining. At present, some small tube liquid level gauges also belong to glass tube liquid level, and the external material is made of stainless steel 304 (minimum standard), which can use water, hydraulic oil, engine oil, etc. 316 stainless steel is used for more corrosive media. 3. Advantages and disadvantages of glass tube liquid level gauge Advantages: 1. The reading is clear, intuitive and reliable. 2. Simple structure and convenient maintenance. 3. Durable. Disadvantages: 1. The scope of application is narrow and fragile. 2, not strong, unsafe, not pressure. 3. The display is unclear and the operating temperature range is low. 4. Precautions for the installation and use of the glass tube liquid level gauge 1. When the glass tube liquid level gauge is transported, handled and installed, it should not be hit or knocked to prevent the glass tube and glass sheet from being broken. 2. After installation, when the medium temperature is very high, do not open the valve immediately, it should be preheated for 20-30 minutes, and then slowly open the valve after the glass tube has a certain temperature. Valve opening procedure: first slowly open the upper valve, and then slowly open the lower valve, so that the measured medium slowly enters the glass tube. 3. During use, the dirt on the inner and outer walls of the glass tube should be cleaned regularly to keep the liquid level displayed clearly. Cleaning procedure: first close the upper and lower valves connected to the container, open the drain valve, drain the residual liquid in the glass tube, use an appropriate cleaning agent or use a long rod brush to wipe away the dirt on the inner wall of the tube. 4. If the quartz tube is broken or the scale is serious and needs to be replaced, the specific steps: remove the lower body, unscrew the nuts and nuts at both ends, tap the quartz glass tube from one end to the other with a wooden stick, take out the graphite ring, Put the new quartz tube in, then put the graphite ring on the quartz tube, and insert it into the watch body at equal distances. Tighten the nuts and nuts at both ends. After confirming that there is no leakage, it can be put into operation.
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