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technical article
How to adjust the gas vortex flowmeter
2012-1-12 10:25:28

主要用于工业管道介质流体的流量测量,如气体、液体、蒸气等多种介质。 Gas vortex flowmeters are mainly used to measure the flow of medium fluids in industrial pipelines, such as gases, liquids, vapors and other media. Its characteristics are small pressure loss, large measuring range and high accuracy.

Hardly affected by parameters such as fluid density, pressure, temperature, viscosity, etc. No moving mechanical parts, so high reliability and low maintenance. Instrument parameters can be stable for a long time. This instrument uses a piezoelectric stress sensor with high reliability.

It can work in the working temperature range of -20 ℃ ~ + 250 ℃. It has analog standard signal and digital pulse signal output. It is easy to be used with digital systems such as computers. It is a relatively advanced and ideal flow meter. Then

This article mainly introduces how to adjust the gas vortex flowmeter.

如何调校——主要存在的问题: How to adjust the gas vortex flowmeter -the main problems:

Mainly: ① Indications are not accurate for a long time; ② There is no indication at all times; ③ The indications are fluctuating over a wide range and cannot be read; ④ The indications do not return to zero; ⑤ There are no indications at small flows; ⑦ flow change

The change of the time indicator cannot keep up; ⑧The k-factor of the meter cannot be determined, and many data are inconsistent.

如何调校——主要问题的分析及解决: How to adjust the gas vortex flowmeter -analysis and solution of the main problems:

1. Selection issues. Some vortex sensors have been selected on the caliber or after the design selection due to the change of process conditions, which makes the selection larger—a specification. The actual selection should choose the smallest caliber as possible to improve

The measurement accuracy is mainly related to problems ①, ③, and ⑥. For example, a vortex street pipeline is designed to be used by several equipments. Because some process equipment is sometimes not used, the actual actual flow is reduced.

The actual use caused the original design to be too large in size, which is equivalent to increasing the lower limit of the measurable flow rate. The indication of the process pipeline when the flow rate is small cannot be guaranteed. It can also be used when the flow rate is large, because it is sometimes too difficult to rebuild

Changes in process conditions are only temporary. Can be combined with parameter re-tuning to improve the indication accuracy.

2. Installation problems. The main reason is that the length of the straight pipe section in front of the sensor is not enough, which affects the measurement accuracy. The reason for this is mainly related to problem ①. For example: the straight pipe section in front of the sensor is obviously insufficient, due to fic203

It is not used for measurement, only for control, so the current accuracy can be used equivalent to degraded use.

3. Reason for parameter setting direction. Due to the parameter error, the meter indication is wrong. The parameter error causes the secondary meter full-scale frequency to be calculated incorrectly. The main reason for this is related to problems ① and ③. Full-scale frequency difference

Many make the indication inaccurate for a long time, the actual full-scale frequency is too large, and the calculated full-scale frequency makes the indication fluctuate widely and cannot be read. The inconsistency of the parameters on the data affects the final determination of the parameters.

The parameters are determined by comparison with each other, which solves this problem.

4. Secondary instrument failure. This part has many faults, including: once the instrument circuit board is disconnected, the range setting has a single bit display that is bad, the k coefficient setting has a single bit display that is bad, making it impossible to determine the range setting and

The k factor is set. This part of the reason is mainly related to problems ① and ②. The problem was resolved by fixing the corresponding fault.

5, four-way line connection problems. Some circuits have good circuit connections on the surface. Check carefully. Some connectors have actually loosened and caused the circuit to be interrupted. Although some connectors are tightly connected, the screws are tightened due to the problem of the auxiliary line.

On the line, the circuit is also interrupted. This part of the cause is mainly related to problem ②.