The key points for the selection and use of smart flowmeters

1. Ensure that the liquid in the smart flowmeter sensor is full. The sensor can be installed horizontally, inclinedly or vertically. However, the measuring tube must be filled with the fluid to be measured, and there must be no non-full tube or air bubbles gathered in the measuring tube.

If it is inclined to install, it should be installed in the rising section of the fluid; if it is installed vertically, it should be installed in the pipe section where the flow direction of the fluid is from bottom to top; if it is installed in the open pipeline, it should be ensured that the fluid in the pipe does not empty. If there is a gap in the two horizontal sections, a high-level pipe with a height of 5m or more is installed to prevent the liquid in the upper-level pipe from emptying. At the end of the upper-level pipe, there is a “gate type” pipe bulge, and the “gate type” pipe is the highest. Set up automatic exhaust.

2. The flow field of the smart flowmeter sensor is stable and there is no whirlpool, and the multi-medium mixing instrument should have enough straight sections upstream and downstream. Generally, the upstream length is not less than 10 times the pipe diameter, and the downstream length is 3 times the pipe diameter.

If the upstream side has two elbows or choke fittings in the form of non-full-opening valves (such as regulating valves), the upstream straight section needs to be longer. If the on-site conditions are not met, a rectifier is installed on the upstream side to improve the fluid flow field without vortexing. In order to have a stable flow field, the flow meter should not be installed on the inlet side of the pump, it should be installed on the outlet side of the pump and should be as far away from the pump as possible.

3, the intelligent flow meter protection lining is not damaged: when installing the smart flow meter, can not use pipe stick or rope through the measuring tube for handling, lifting, so as not to damage the lining. Install the F4 lining flowmeter. When tightening the flange, pay attention to the force evenly, otherwise it will be easy to crush the lining. It is best to use a torque wrench.

Use a smart flowmeter in the negative pressure piping. The lining should be firmly bonded. The poorly adhesive lining must not be used for negative pressure piping. Including the suction side piping of the pump. Measure the piping with vibration. Pipes should be fixed on both sides of the flowmeter. , if necessary, cut off the source with a soft connection.

4, to avoid deposits around the electrode debris: Smart flow meter to measure the liquid with particles, it is best to install the vertical, so that when the liquid stops flowing, solid particles will not be deposited in the measuring tube.

Seawater and raw water are measured. Sludge or growth organisms are deposited in the electrode area. Therefore, the measuring tube should be periodically cleaned. The cycle is usually once a year. Therefore, a manhole is provided on the pipe near the large-caliber intelligent flowmeter, and a hand hole is provided on the small-caliber pipe to facilitate manual cleaning of the measuring pipe.

5, set a good grounding device: general sensor has been designed when the ground electrode is supplied, but when the external electromagnetic field interference is large, the smart flowmeter should be set up another grounding device, grounding wire with cross-sectional area greater than 4mm 2 stranded copper wire, The grounding wire is buried in the wet ground for 1m. The grounding resistance is less than 10Ω and it cannot share the ground wire with the motor or other equipment.