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Let you thoroughly understand the installation instructions of the flowmeter

The flowmeter is an indispensable instrument for measuring the flow of liquid and gas. Everyone must have seen many different types of flowmeters.

The correct installation method is very important for the flowmeter. Today, the automation channel brings you several common flowmeter installation requirements.

First introduced is the electromagnetic flowmeter, readers who are instrumentalists must have seen electromagnetic flowmeters on many occasions.

The measurement principle of the electromagnetic flowmeter does not depend on the characteristics of the flow. If there is a certain turbulence and vortex generated in the pipeline in the non-measurement zone, it is independent of the measurement.

A. There should be no large vibration source at the installation site, and reinforcement measures should be taken to stabilize the pipeline near the instrument;

B. It cannot be installed near large transformers, motors, pumps, etc., which generate large magnetic fields to avoid interference from electromagnetic fields.

C. When connecting the sensor to the pipeline, ensure full pipe operation, preferably vertical installation;

D. The transmitter casing, shielded cable, measuring body and the pipes at both ends should be grounded. The grounding pole should be set separately. The grounding resistance should be less than 10 ohms and cannot be connected to the electrical or public grounding network.

E. It is required to have a straight pipe section with 3 times the diameter of the pipe after 5 times.

Detailed explanation is as follows:

If there is a steady-state eddy current in the measurement zone, it will affect the stability of the measurement and the accuracy of the measurement. In this case, the length of the straight pipe section can be increased, a flow stabilizer can be used or the cross section of the measurement point can be reduced to stabilize the flow velocity distribution.

The flow meter can be installed horizontally and vertically, but it should be ensured that the influence of deposits and bubbles on the measuring electrode is avoided and the axial direction of the electrode is kept good. When installed vertically, the fluid should flow from bottom to top.

The sensor cannot be installed in the highest position of the pipe, which is easy to accumulate air bubbles.

Make sure that the flow sensor is full of the fluid under test when measuring, and that the non-full tube state cannot occur.

If the pipe is not full or the outlet is vented, the sensor should be mounted on a siphon.

The conventional straight pipe section of the electromagnetic flowmeter is required to be 5D after the first 10D, and there are different requirements in the case of the bent pipe and the valve.

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