After-sales case sharing of turbine flowmeter in a pure water plant

Introduction: Coordinated with a pure water plant in Weinan, Shaanxi, the company mainly supplies pure water to seaside enterprises. Customer demand: pre-purchased our company's LD electromagnetic flowmeter, and the turbine flowmeter cannot be used after replacement.

On-site problems and solutions

1. On-site questions

Hiltech after-sales personnel learned from the site that a turbine flowmeter used at the site, because the actual flow of the water pipeline is lower than the lower measurement limit of the original turbine flowmeter, the flowmeter cannot be recognized, so the flowmeter needs to be replaced.

The LD electromagnetic flowmeter installed on site, the measurement medium is pure water with low conductivity, and the flow range is 0-500m/h. The temperature is normal temperature. After the installation is complete, the flow rate is displayed accurately, but there will be slight fluctuations, which is a normal phenomenon.

2. Solution

(1) Adjust the zero point correction in the parameters so that the upward value is 0;

(2) Adjust the upper limit of flow to 500.

Main flow chart of on-site process

Common Problems of Turbine Flowmeter for Measuring Pure Water

Turbine flowmeter is an instrument that can measure pure water. It has the advantages of high accuracy, good repeatability, simple structure, small pressure loss and convenient maintenance, and is widely used in the water treatment industry.

Turbine flow measurement FAQs for measuring pure water

1. Why is the negative value displayed sometimes?

A: If it is installed backwards, two-way measurement can be used.

2. There is no such suitable straight pipe section at the scene, what should I do?

Answer: Doing a bypass not only ensures the straight pipe section, but also facilitates later maintenance.

3. Is your accuracy for the entire flow range?

Answer: This accuracy refers to the more suitable range in the middle, and the accuracy will be slightly worse at the upper and lower limits of the range.

4. Why does the value jump after the scene is connected?

Answer: The electromagnetic interference in the vicinity is too strong, and no grounding treatment has been done.

5. What is the difference between one body and one body?

Answer: It is judged by the installation conditions on site.

6. Why is there no data or inaccurate measurement of the flow meter for measuring sewage for a long time?

Answer: It may be that the electrode is covered with sludge or damaged. Regular maintenance is recommended.

7. Why is there no reading in the flow meter measurement on my site?

Answer: Reasons for the medium: insufficient water content, insufficient electrical conductivity, too small flow rate or dissatisfied pipe, etc.

8. The measured value is inconsistent with the output value, what is the situation?

A: The tube is not full, the flow rate is too low, the converter is damaged, and the range is exceeded.

9. Why is there a traffic display after connecting?

Answer: The pipeline is not filled with liquid or the liquid contains air bubbles, subjectively think that the liquid in the tube pump has no flow, but actually there is a small flow, liquid aspects (such as poor uniformity of liquid conductivity, electrode pollution, etc.)

How to avoid fluid shock damage to turbine flow sensor in field application?

Turbine flowmeter has a long history of development, abundant experimental data, mature technology, high accuracy, good repeatability, and small pressure loss.

The turbine flowmeter measures the volume flow of the medium by using the principle that the rotation of the impeller continuously cuts the magnetic steel and the magnetic field lines of the coil in the signal detector. Limited by the principle, in order to avoid the occurrence of failure, the turbine flowmeter needs to strengthen the protection especially for the impeller.

Although the instrument manufacturer has strengthened the protection of the impeller by improving the deflector, changing the material and structure of the core in the production process, and reducing the failure rate caused by damage to the impeller, the turbine flowmeter impeller is damaged due to misuse on site. Failures also occur from time to time.

When opening and closing the valve, it should be as gentle as possible. If automatic control is used, it is best to use the method of "two-stage opening and two-stage closing" to prevent the fluid from suddenly impacting the impeller or water hammer from damaging the impeller.