Electromagnetic Current Meter Installation

Electromagnetic current meter are primarily used to measure the flow rate of conductive media with good flowability. They are categorized into insertion-type and in-line types. Both in-line and insertion flowmeter electromagnetic share similar installation requirements, though some differences exist. Generally, specific demands are placed on the external environment and installation methods.

Electromagnetic Current Meter Installation Environment Requirements

To ensure stable and reliable operation of the electromagnetic flowmeter, the following requirements should be considered when selecting an installation location:

1. Avoid ferromagnetic objects and equipment with strong electromagnetic fields (e.g., large motors, transformers) to prevent interference with the sensor's working magnetic field and flow signals.

2. Install in a dry, well-ventilated location. Protect from direct sunlight and rain. Ambient temperature should range from -20°C to +60°C, with relative humidity below 85%.

3. Ensure sufficient clearance around the flowmeter for easy installation and maintenance.

Selection of Installation Location for Electromagnetic Current Meter

Electromagnetic current meter can be installed on horizontal or vertical pipelines.

1. Select a straight pipe section filled with liquid, such as a vertical pipeline section (preferably with flow direction from bottom to top) or a horizontal pipe filled with liquid (preferably at the lowest point of the entire pipeline). This location must ensure the pipeline remains continuously filled with the measured fluid. Partial filling of the pipe must not occur during installation and measurement.

2. Select locations with minimal fluid flow pulsation. Avoid areas near pumps, valves, elbows, or other local obstructions.

3. When measuring two-phase fluids (solid-liquid or gas-liquid), choose locations unlikely to cause phase separation.

4. Prevent negative pressure at the measurement point.

5. The diameter or circumference of the side tube should be easy to measure, with low ovality.

6. Straight pipe length: The upstream straight pipe length before the sensor installation should be greater than or equal to 10D, while the downstream length should be no less than 5D.

7. Insertion-type electromagnetic flow sensors have two insertion methods: one is along the centerline of the measured pipe, and the other is 0.25D from the inner wall of the pipe.

8. Vertical installation: When inserting the sensor into the pipe, the angle between the vertical diameter of the pipe section and the pipe section should be less than 5°. This is suitable for measuring clean media with minimal pipe vibration.

9. Angled Installation: The sensor axis forms a 45° angle with the measured pipeline axis. Suitable for measuring liquid flow in larger pipe diameters and media containing other impurities. This installation method offers low water resistance and is not suitable for wrapping.

Installation Flanges for Electromagnetic Current Meter

A. Select the installation location and determine the appropriate length of upstream and downstream straight pipe sections. Cut the pipe section where the flowmeter will be installed.

B. Weld one flange to each end of the straight pipe sections. Place gaskets on both ends of the sensor, then connect the sensor to the flanges using double-headed bolts (ensure the arrow direction on the meter body aligns with the fluid flow direction).

C. Weld the straight pipe sections before and after the sensor to the original pipe.

Important Notes:

1. During welding, ensure the flange face is perpendicular to the pipe centerline.

2. The location with the largest mounting hole spacing is where the meter rod is installed. The mounting hole directions on both flanges must align.

3. After flange welding, thoroughly clean the pipe to remove all slag and debris.

Converter Installation and Cable Connection

The converter for split-type electromagnetic flowmeters should be installed near the sensor for easy reading and maintenance. It may also be installed in the instrument room, where environmental conditions are significantly better than those around the sensor.

The distance between the converter and sensor is constrained by the conductivity of the measured medium and signal cable limitations. Specifically, these include the cable's distributed capacitance, conductor cross-section, and number of shielding layers. Use the information cable provided by the manufacturer with the instrument.

For liquids with low conductivity and longer transmission distances, triple-shielded cables are specified.

Single-shielded cables are used for industrial water or acidic/alkaline liquids, typically with a transmission distance of 100m.

To prevent signal interference, signal cables must be routed separately through steel conduit with proper grounding. Never place signal cables and power cables within the same steel conduit.

Special electromagnetic current meter Installation Scenarios

For pipelines where flow interruption is unacceptable during operation, a bypass pipeline must be installed alongside the flowmeter and flushed during installation. As shown in the diagram, this configuration ensures continuous system operation when the flowmeter is taken out of service.

The inner diameter measured by the flowmeter should match the pipe's inner diameter. If the inner diameters cannot be identical, the pipe's inner diameter should be larger than the flowmeter's inner diameter. Install a tapered pipe or expansion pipe with a taper angle not exceeding 15 degrees between them, as shown in the figure.

When installing the flow meter at an angle or vertically, the flow direction should be from top to bottom, as shown in the figure.

All electromagnetic current meter installations. Detailed descriptions cannot be provided here. If you encounter issues during flowmeter electromagnetic installation, please contact our engineers promptly. We will guide you through the electromagnetic current meter installation process.