『Wiring of flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
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 to wire ultrasonic flowmeter
The core of ultrasonic flowmeter wiring is to distinguish between the sensor and the converter, follow the corresponding interface identification, and operate strictly according to the instructions.
. 1. Sensor wiring operation: ① Confirm the type of sensor or pure sensor: According to the installation method, it can be divided into three types: external clamp type, plug-in type, and pipe section type. Among them, external clamp type does not require damaging the pipe wall and wiring is the simplest. ② Connect the dual channel cable: the transmission line (Tx) is connected to the sensor transmission end, and the reception line (Rx) is connected to the reception end. Pay attention to the anti rust treatment of the interface, and most connectors are designed with aviation plugs. 2. Key points of converter wiring: ① Power configuration: Identify equipment requirements and choose AC220V or DC
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