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1. What is the coil voltage included in the electromagnetic flow? The excitation coil voltage of an electromagnetic flowmeter is usually in the range of 5-50V, and the specific value depends on the instrument model, caliber size, and manufacturer design. 1. The working voltage of the excitation coil of electromagnetic flow meters with different diameters and models varies in common voltage ranges: - Small caliber instruments (DN10-DN50): commonly used 5-15V low-voltage excitation - Medium and large caliber instruments (DN65-DN1200) are lacking: mostly use 15-30V standard voltage - Extra large caliber or special applications (DN1400 or above): may require a higher voltage of 30-50V. 2. Influencing factors The specific value of excitation voltage is mainly affected by three factors: • Measuring tube diameter: the larger the diameter, the higher the required magnetic field strength, and the corresponding voltage increase. • Excitation methods: DC excitation, power frequency excitation, low-frequency rectangular wave excitation, etc. Different voltage requirements vary. • Manufacturer design: There are differences in technical solutions and component specifications adopted by different brands. 3 Practical application tips for installation and maintenance: - It is strictly prohibited to directly measure the excitation coil voltage on site, as it may damage the instrument electrical cleaning subunit. - It is necessary to consult the product manual of the corresponding model to obtain accurate parameters (such as the rated excitation voltage of the Yokogawa AXF series is 24V ± 10%, and the Cologne IFC300 series is 22.5V). - The coil resistance value is usually 20-200 Ω (at 25 ℃), and the coil state can be indirectly judged 
2. Wiring diagram and connection method of Yokogawa flowmeter
The wiring core of Yokogawa vortex flowmeter lies in the correct connection of power supply, signal line, and output signal. The use of DC power supply and strict distinction between frequency and analog signal terminals are the key to success.
. The wiring diagram of the Yokogawa vortex flowmeter clearly divides three functional areas: power wiring, signal wiring, and output signal wiring. Understanding this structure is the first step to proper connection. 2. Specific connection method 2.1 Power supply wiring Flow meters usually use DC power supply with a voltage range between 12V and 36V. When connecting, the positive pole of the power supply needs to be connected to terminal V+, and the negative pole needs to be connected to terminal V -2.2 Signal line wiring. This part includes two types of signal lines. One end of the frequency output signal line (usually green or blue) should be connected to the F+or Fout terminal of the flowmeter, and the other end should be connected to the frequency input terminal of the control device. One end of the analog current output signal line (usually white or yellow) is connected to the I+or Iout terminal, and the other end is connected to the analog current input terminal of the control device. 2.3 Output signal wiring: Select the output signal type according to the actual measurement requirements. If a frequency signal is required, lead the frequency output line to the fr