How to use gas flowmeter to measure the dryness of medium?

Gas flowmeter is an instrument to measure the mass flow of gas using the principle of heat conduction, which can realize the high precision measurement of the mass flow of gas. The plug-in gas flowmeter may be of either one-piece or split-piece construction, with sensors and metal rods inserted into the measuring pipe. For the flow measurement of large section duct, the plug-in gas flowmeter is generally used. How to use gas flowmeter to measure the dryness of medium?

To sum up, software compensation based on theoretical analysis can not solve all the problems of probe rod vibration. The purpose of the invention is to solve the problem that the probe rod of the existing gas flowmeter will produce swaying vibration along the direction of the wind flow so as to measure the accuracy. The invention is designed to provide a vibration-resistant plug-in gas flowmeter which can effectively resist the vibration of the plug-in metal probe rod along the direction of the air flow, eliminate the influence of the air flow on the cantilever structure, and improve the measurement accuracy.

You only need to provide as complete as possible operating data and some technical requirements. For example, the flow range (recommended flow unit using standard), the measurement of the medium, the caliber of the pipeline, the material of the pipeline, the working pressure, the working temperature, whether the requirements of explosion-proof, flowmeter working environment temperature, signal power requirements, the accuracy level, the application in what process (process control or trade measurement), the measurement of media dryness and cleanliness.

The flange is connected with the end of the fixed section of the steel pipe and is fixed with the outer wall of the air duct wall. The probe rod passes through the flange and the steel pipe successively and the end of the suspended section of the measuring head extends out of the steel pipe; Locking structure for locking and fixing the probe rod, flange and steel pipe. Also includes: shockproof structure, shockproof structure is arranged in the inner wall of the steel pipe, shockproof structure includes a pair of V-shaped shrapnel, V-shaped shrapnel is symmetrically arranged in the inner wall of the steel pipe, the convex part of the V-shaped shrapnel and elastic contact with the probe rod through the steel pipe.

Due to the large size of the air duct, the metal probe rod of the gas flowmeter has a long insertion depth and can only be fixed on the sleeve outside the air duct arm to form a cantilever structure. Therefore, under the action of wind, the metal probe will produce swaying vibration along the flow direction of the wind, and the sensor probe moves along the vibration arc at the measuring point in the pipeline, which will make the relative speed of the sensor and the air flow change, thus affecting the measurement accuracy of the sensor probe. Meanwhile, the vibration of the metal probe is easy to relax the mechanical seal structure of the installation position of the instrument and the air duct wall. Loss of sealing effect; In addition, due to the complex applications of gas flowmeters, the diameter, size and structure of pipelines do not fully meet the requirements of the theoretical model, and the airflow model is unstable. Even if the diameter, size and structure of pipelines meet the modeling requirements, the vibration of the probe rod is still different under different gas flow rates.

In the flow measurement failure probability, the improper selection of flowmeter accounts for about 70%, the quality of flowmeter products or other reasons account for 30%, so the selection of flow measurement is very important. Thermal flowmeter users should be particularly careful not to select a certain type of flowmeter, unless you choose to replace the original flowmeter and leave the job to the seller, because they are professional.

If you must choose a separate body, it is recommended that the separation distance selection should be as short as possible. If the measuring gas is not air other gas medium, it is recommended to choose the hot flowmeter products with real flow calibration abroad, this must be kept in mind. Of course, unless you have low requirements for measured data, don't care how much deviation, just to look at the flow trend, or you can choose those low-end thermal flowmeter products. Be on the lookout for cheap dumping products.

The invention relates to an anti-vibration plug-in vortex flowmeter probe, which comprises an instrument transmitter, a probe rod and a measuring head. The measuring head is connected with an instrument transmitter through a probe rod; The steel pipe comprises a suspended section and a fixed section. The fixed section is used to pass through the air duct wall to be fixed, and the suspended section is used to hang on the inside of the air duct wall.

In order to solve the above problems, the known anti-vibration solution of the sensor probe is instrument software compensation. According to the diameter and structure of the pipe, the theoretical model of the corresponding gas velocity and the vibration model of the probe rod are established, the vibration position of the probe rod is measured, and the instrument vibration is compensated by software. However, this method of software data processing is at the cost of increasing the meter response time, which is long and costly.

The shock-proof structure is arranged in the inner wall area near the end of the suspension section of the steel pipe. V-shaped shrapnel is made of metal material. The measuring head is used to convert the flow of non-electrical information number into electrical signal which is transmitted to the instrument transmitter through the probe rod; Instrument transmitter is used to process electrical signals to obtain flow data and display flow data. Flange plate and steel pipe are connected by welding, or flange plate and steel pipe is an integral structure. The locking structure and the probe rod are connected by screw thread. Steel pipe is made of stainless steel metal material. Flange is made of stainless steel metal material.

To measure the flow rate of mixed gas, it is necessary to provide the percentage value of each medium. A final reminder: if the site conditions, flowmeter selection integration. If it is separate, because the transmission signal cable is as a part of the measurement bridge, itself is resistance value, no matter how excellent, because the resistance value of the measurement probe is very small, the resistance value of the cable is bound to affect the calculation and processing of the electronic circuit, coupled with the impact of the field environment, the resistance value will produce drift.

Calculate the basic cost to see whether it can guarantee the quality of the product flow meter products, there is a basic cost is inseparable, the right choice of gas flow meter is the most critical, to learn more, master the measurement principle and product performance, and product manufacturers do more in-depth communication with business personnel, identify the characteristics of the brand.