Flow meter output signal| Zhanjiang ultrasonic flowmeter manufacturer

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1. What does the output pulse signal of an electromagnetic flowmeter mean?

Electromagnetic flowmeters generally output a current signal of 4-20mA, and the pulse signal of the "La Sui Bu Que Shan Chong" is the frequency signal.

2. How can the output signal of the flowmeter be used for on-site flow display and shared control of the water pump?

The output signal of the flowmeter can be used for on-site flow display and shared control of the water pump through a signal distributor or PLC. Signal type and processing method: Flow meters commonly use 4-20mA analog signals or pulse/frequency signal outputs. To achieve display and control sharing, the core is to use a signal distributor to convert one input signal into two identical output signals: one is sent to the on-site display instrument, and the other is sent to the water pump controller

2. Specific implementation plan: Plan 1: Signal distributor method • Install signal distributor (such as P+F, Weidmuller and other brand isolated signal distributors) • Connect the flowmeter output to the distributor input terminal • Distributor output A is connected to the flow display instrument (such as Yokogawa AX400 series) • Distributor output B is connected to the water pump controller (such as Siemens S7-1200 PLC analog input module) • Cost is about 800-2000 yuan (distributor+installation accessories) Plan 2: PLC acquisition and distribution method • Connect the flowmeter signal to the PLC analog input module (such as Yokogawa AX400 series) Such as 4AI × 16BIT module) • Through PLC Implement signal processing through programming • One signal is transmitted to the touch screen display through a communication protocol (such as Modbus RTU) • The ot

her signal is controlled by the PLC output module to start and stop the water pump • The cost is about 2000-5000 yuan (including PLC and programming fees). 3 Key parameter configuration slag • Signal matching: Ensure that the range settings of the display instrument and controller are consistent (such as 4mA corresponds to 0m ³/h, 20mA corresponds to 100m ³/h) • Sampling rate: The response time of the control loop should be ≤ 100ms, and the display update can be set to 1s • Isolation protection: The signal distributor needs to provide isolation protection of 1500V or above to prevent interference 4 Safety precautions • An independent emergency stop circuit must be configured to bypass the PLC and directly cut off the power supply of the water pump • Signal fault protection: set signal loss detection (＜ 3.6mA or ＞ 21mA) to automatically stop the pump • Must comply with GB/T 50770-2013 "Design Specification for Safety Instrumented Systems in Petrochemical Industry" 5 Key points for on-site implementation: The installation position of the display instrument should be easy to observe, 1.5-1.7 meters above the ground. Shielded twisted pair cables (such as AWG18 × 2P+1C) should be used for control cables. The grounding resistance should be ≤ 4 Ω to avoid signal interference. Regular calibration: The signal accuracy should be verified every 6 months, and the error should be ≤± 0.5%. FS. The latest industrial site mostly adopts Plan 2. According to the 2024 Ministry of Industry and Information Technologys "Outline for the Development of Intelligent Detection Equipment Industry" promotion data, 73% of new projects adopt PLC integrated solutions, which can improve signal utilization by more than 40% compared to traditional distrib

Flow meter output signal

1. What does the output pulse signal of an electromagnetic flowmeter mean?

2. How can the output signal of the flowmeter be used for on-site flow display and shared control of the water pump?

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