Product Details

1. Installation site for LWGY type medical water turbine flowmeter

The sensor should be installed in a location that is easy to maintain, with no vibration, strong electromagnetic interference, or thermal radiation in the pipeline. Sensors are sensitive to the distortion of flow velocity distribution and rotational flow in pipelines. When entering the sensor, it is necessary to fully develop the pipe flow. Therefore, necessary straight pipe sections or flow adjusters should be equipped according to the type of upstream flow resistance components of the sensor. If the upstream flow resistance component is unclear, it is generally recommended that the length of the upstream straight pipe section be no less than 20D and the downstream straight pipe section be no less than 5D. If the installation space cannot meet the above requirements, a flow adjuster can be installed between the flow resistance component and the sensor. When installing the sensor outdoors, measures should be taken to avoid direct sunlight and rain.

2. Installation requirements for LWGY type connecting pipeline of medical water turbine flowmeter

Sensors installed horizontally require that the pipeline should not have any visible tilt (generally within 5 °), and sensors installed vertically should also have a verticality deviation of less than 5 °.

In places where continuous operation is required without stopping the flow, bypass pipes and reliable shut-off valves should be installed, and the bypass pipes should be ensured to be leak free during measurement.

At the location where sensors are installed in newly laid pipelines, a short pipe is first inserted to replace the sensors. After the "line scanning" work is completed and the pipeline is confirmed to be clean, the sensors are officially connected. Due to neglecting this work, it is not uncommon for the sensors to be damaged during line scanning.

If the fluid contains impurities, a filter should be installed on the upstream side of the sensor. For those that cannot be stopped, two sets of filters should be installed in parallel to alternately remove impurities, or an automatic cleaning type filter should be selected. If the measured liquid contains gas, a gas eliminator should be installed on the upstream side of the sensor. The discharge and exhaust ports of filters and air purifiers should be connected to a safe location.

If the sensor is installed at the low point of the pipeline, to prevent impurities from settling and accumulating in the fluid, a discharge valve should be installed in the subsequent pipeline to regularly discharge the settled impurities.

The flow regulating valve should be installed downstream of the sensor, and the upstream shut-off valve should be fully opened during measurement, and these valves should not produce vibration or leakage to the outside. For processes that may generate reverse flow, check valves should be added to prevent fluid from flowing in the opposite direction.

The sensor should be concentric with the pipeline, and the sealing gasket should not protrude into the pipeline. The liquid sensor should not be installed at the highest point of the horizontal pipeline to prevent gas accumulation in the pipeline (such as air mixed in during flow stoppage) from staying at the sensor, which is difficult to discharge and cause image measurement.

The front and rear pipelines of the sensor should be firmly supported without vibration, and insulation measures should be taken for the sensor and its front and rear pipelines for fluids that are prone to condensation.

3. Opening and closing sequence of LWGY type medical water turbine flowmeter put into operation

For flow sensors without bypass pipes, first open the upstream valve of the flow sensor at a medium opening, then slowly open the downstream valve and run at a lower flow rate for a period of time (such as 10 minutes), then fully open the upstream valve, and then increase the downstream valve opening to adjust to the required normal flow rate.

For the flow sensor equipped with bypass pipe, first fully open the bypass pipe valve, open the upstream valve at a medium opening, slowly open the downstream valve, and turn down the opening of the bypass valve to make the instrument run at a small flow for a period of time, then fully open the upstream valve, fully close the bypass valve (to ensure no leakage), and finally adjust the opening of the downstream valve to the required flow.

4. Implementation of LWGY type medical water turbine flowmeter for low-temperature and high-temperature fluids

Before passing through the low-temperature fluid pipeline, the water in the pipeline should be drained. When passing through, the pipeline should run at a very low flow rate for 15 minutes, and then gradually increase to normal flow rate. When stopping the flow, it should also be done slowly to gradually approach the pipeline temperature and ambient temperature. The operation of high-temperature fluid is similar to this.

5. Other precautions for medical water turbine flowmeter LWGY type

The opening and closing valve should be as smooth as possible. If automatic control is used for opening and closing, it is best to use the "two-stage opening, two-stage closing" method to prevent sudden fluid impact on the impeller or even water hammer damage to the sensor impeller.

Check the downstream pressure of the flow sensor. When the pipeline pressure is not high, observe whether the downstream pressure of the sensor at the maximum flow rate is greater than the pmin calculated by formula 5 during the initial operation. Otherwise, measures should be taken to prevent cavitation.

• Customized processing: Yes

• Type: Speed type

• Measurement range: 0-99999

• Accuracy level: 0.5 level

• Nominal diameter: DN2-DN300

• Applicable medium: Pure liquid

• Work pressure: 0.25-6.3MPa

• Working temperature: -10-110 degrees Celsius