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1. Six commonly used classification methods for electromagnetic flow meters:
The six commonly used classification methods for electromagnetic flow meters are as follows:
1. Classification according to the output signal connection and excitation (or power) connection system. Four wire electromagnetic flow meters: The output signal line and the power blocking line (or the excitation wire between the flow sensor and the sensor) are composed of two sets of four wire systems with two wires each, which is the current mainstream system. Two line electromagnetic flowmeter: The output signal and power supply share the same wire, without the need for mains power supply, suitable for remote places without mains power supply. Its power supply design is divided into zero signal output current (4mA) supply, greater than zero signal output supply, and battery (or solar cell) supply. The battery powered sun wheel type is suitable for places where it is difficult to introduce mains electricity, and the battery life ranges from 1-2 years to 8-10 years.
2. Classified Electromagnetic Flowmeters by Sensor and Converter Assembly Method: The sensor is connected to the pipeline, and the converter is installed in the instrument room or nearby, with a distance of tens to hundreds of meters.
. The signal cable adopts double-layer shielding. When measuring low conductivity liquids and the distance exceeds 30 meters, the drive needs to be shielded. Separable converters can be kept away from harsh environments and are easy to maintain, but the installation cost is relatively high. Integrated electromagnetic flowmeter: The sensor and converter are assembled as one, directly outputting standard signals, shortening the length
3. Classification of flange connections according to the connection method between flow sensors and pipelines: It is customary to have flanges at both ends of the sensor, which are fixed to the pipeline flange with bolts and suitable for large-diameter sensors.
. The International Organization for Standardization (ISO 13359; 1998) has standardized the length between flange faces. Flange clamp connection: The sensor has no flange and is clamped between the two flanges of the pipeline with long bolts. It has a small volume, light weight, and strong adaptability, but is only suitable for small pipe diameters (below 200mm) and lower pressures. Clamp connection: enables quick disassembly and installation, facilitating daily cleaning. Threaded connection: commonly used in industries such as medicine, food, and high-pressure water injection or cement slurry flow measurement, with a trapezoidal thread shape.Fourth, classify contact electrodes according to whether the flow sensor electrode is in contact with the measured liquid: habitual structure, direct contact between the electrode and the liquid, usually a pair of electrodes, and large-diameter instruments may use two pairs of electrodes.
. Non contact electrode: The electrode is tightly attached to the outer surface of the lining and detects signals through capacitive coupling, which is called a capacitive Jiankaiyou electromagnetic flowmeter. Non electrode surface effect noise is not affected by non
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