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1. Wiring method of electromagnetic flowmeter
The wiring method of electromagnetic flowmeter mainly includes the connection of power line, signal head nuclear number output line, and grounding wire. The specific wiring needs to be determined according to the model and site requirements.
1. Power Wiring AC power supply • Standard AC 220V power supply: L to live wire, N to neutral wire, PE to ground wire (neutral wire needs to be distinguished) • AC power supply needs to be equipped with an independent circuit breaker with a wire diameter of not less than 1.5mm ² 2. DC power supply • DC 24V power supply: positive pole connected to+V terminal, negative pole connected to COM terminal • DC power supply needs to ensure a voltage fluctuation range of ≤± 10%, and it is recommended to use a regulated power supply
2. Signal output wiring 1 4-20mA analog output • Two wire system: positive pole connected to IOUT+, negative pole connected to IOUT - (requires external 250 Ω precision resistor) • Four wire system: separate power supply terminal isolated from signal output terminal 2 Pulse/frequency output • Open collector output: OUT+connected to the positive pole, OUT - connected to the load and then connected to the negative pole of the power supply • A pull-up resistor (usually 1-10 k Ω) needs to be configured, and the output voltage matches the PLC. 3. Digital communication interface • RS-485 interface: DATA+connected to line A, DATA - Connect B-line using shielded twisted pair cable • HART protocol: stacked on a 4-20mA circuit, a 250 Ω resistor needs to be connected in series
III. Wiring precautions • Strictly distinguish between power cables and signal cables (spacing>15cm or isolated through metal pi
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IV. Safety warning • Before wiring, it is necessary to confirm that the power is cut off to prevent electric shock or equipment damage • It is strictly prohibited to plug connectors with live wires to avoid burning communication interfaces • In intrinsically safe and explosion-proof situations, safety should be coordinated with safety Before using the grid, it is recommended to consult the corresponding model manual for specific wiring. Different brands (such as E+H, Cologne, Yokogawa) may have different definitions of terminals.
2. How is the ultrasonic flowmeter wired?
The wiring of ultrasonic flow meters is usually very simple, and the core is "matching the right place". Basic wiring process: Preparation: Power off operation! Ensure that the flow meter and system power are completely turned off. Finding interfaces: Find the wiring terminals or interfaces on the flowmeter converter (host), which are usually clearly labeled. Connect power supply: Connect the positive (L/+) and neutral (N/-) wires of the mains (such as 220V AC) or DC power supply (such as 24V DC) to the terminals labeled "POWER" or "Power Supply". Attention: Be sure to verify the voltage level required by the equipment! Output (if any): 4-20mA output: Connect to the terminal labeled "AO" or "4-20mA", used to connect DCS, PLC or recorder. Relay output: connected to terminals labeled "DO" or "Alarm", used for alarm or control. Communication interface: RS-485 and other communication line