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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. What is the general installation spacing of sensors for ultrasonic flow meters?
The installation spacing of sensors for ultrasonic flow meters needs to be determined according to the pipeline diameter, fluid type, ultrasonic model, and industry standards. The general range is generally between 0.5m and 10m, and specific requirements need to be strictly matched with the official instructions of the corresponding product.
.1. General selection reference range 1 Small caliber pipelines (DN10~DN50): The installation spacing is usually 0.5m~2m, and it is necessary to ensure that the upstream and downstream straight pipe sections meet the requirements of at least 10 times the diameter of the pipeline (upstream) and 5 times the diameter of the pipeline (downstream), to avoid fluid disturbance affecting measurement accuracy.
2. Medium caliber pipelines (DN50~DN300): The installation spacing is generally 1m~5m, and most mainstream ultrasonic flow meters can ensure that the signal-to-noise ratio meets the standard in this range.
3. Large caliber pipelines (DN300 and above): The installation spacing can be relaxed to 3m~10m, and some special models for large diameters support larger spacing, but it is necessary to first refer to the official parameters provided by the manufacturer.
.2. Key Limitations 1 Fluid characteristics: For slurries or highly turbid fluids containing a large number of bubbles and solid particles, the installation spacing should be shortened to the lower limit of the general range to prevent measurement failure caused by excessive attenuation of ultrasonic signals
2. Pipeline material: The acoustic impedance of non-metallic pipelines (such as PVC, fiberglass) is significantly different from that of metal pipelines, and the allowable installation spacing of some models of sensors may be reduced by 10%~20% compared to metal pipelines
3. Measurement accuracy requirements: F