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1. Wiring diagram of ultrasonic flowmeter
Ultrasonic flowmeter wiring is mainly divided into two parts: host wiring and probe wiring. There are differences between different brands and models, and it is necessary to follow the product manual for accuracy. 1. Power input for host wiring: Supports AC 220V or DC 24V power supply. Choose one of them according to the wiring diagram. Sensor interface: - Downstream probe connected
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2. Terminal 3 (GND, DN -, DN+), usually only need to be connected to DN - and DN+(terminals 2 and 3) - Upstream probe connected
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5. Terminal 6 (GND, UP -, UP+), usually only need to be connected to UP - and UP+(terminals 5 and 6) 4-20mA output: AO terminal connected to signal positive pole, 24V - terminal connected to signal negative pole 485 communication: connect 485 OUT A and 485 OUT B terminals Heat meter function: - Water supply terminal connected to TX
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1. GND - Return terminal TX
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2. GND (supply and return GND are connected together) Relay output: Connect RELAY+and RELAY - terminals 2. Probe wiring Probe cables usually include shielded wires, signal positive (+) and signal negative (-) terminals. Conventional connections only require connecting the+and - terminals, and shielded wires can be omitted. Due to possible differences in terminal definitions and wiring methods among different manufacturers, please make sure to check the wiring diagram provided in the instruction manual before actual wiring.
2. Ultrasonic flowmeter
3. What are the reasons for the large fluctuations of Elster ultrasonic flowmeter
The main reasons for the large fluctuations of Elster ultrasonic flowmeter are as follows
1. Installation problem • Insufficient straight pipe section: The installation position does not meet the requirements of the first 15D and last 5D (D is the diameter of the pipeline), resulting in unstable fluid.
. Uneven flange surface: The connecting flange has burrs or unevenness, which can cause measurement fluctuations at high flow rates. • Installation is not standardized: the position or pipeline size is not selected according to the manufacturers requirements, and the length of the inlet and outlet sections does not match2. External interference • Pipeline vibration: mechanical vibration interference signal, which can be checked by observing whether the output fluctuates when there is no flow. Strong interference source: nearby high-power devices (such as frequency converters) affect signal acquisition. • Environmental changes: Temperature fluctuations or electromagnetic interference may cause abnormal data
3. Fluid characteristics • Gas bubbles or air: Gas carried in liquids can cause severe fluctuations when flowing at high speeds. • Changes in fluid properties: Sudden changes in temperature, pressure, or particle concentration affect measurement stability. • Actual flow fluctuation: Unstable process conditions (such as frequency changes in variable frequency pumps, frequent valve opening and closing)
4. Equipment itself • Probe failure: Abnormal sound wave transmission caused by wear, scaling, or condensation, manifested as irregular data jumps. Converter issue: The circuit board may be damp, the power supply may be unstable, or the parameter settings may be incorrect, which may display an "ERR" error message. Improper selection: Low end models have insufficient accuracy at low flow rates,