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The main reason why an ultrasonic flowmeter displays 0000 despite having a flow rate is due to abnormal signal reception or incorrect parameter settings, which result in the system determining that there is no effective flow rate. 1. Installation and sensor issues: Improper installation position: too far away from the pipe wall, close to turbulent areas such as bends/valves, can cause distortion of ultrasonic signals. Sensor failure: dirty transducer surface, dry coupling agent, short circuit of the circuit or corrosion of the joint, requiring cleaning, testing or replacement of coupling agent. Failure: special coupling agent needs to be reapplied to ensure sound wave transmission. 2 Abnormal working conditions and medium flow rate: When the flow rate is below the minimum detection threshold of the flowmeter (usually 0.1m/s), it cannot trigger a change in the measured medium state. High temperature gasification, excessive bubbles or impurities will affect the ultrasonic penetration rate. Temperature/pressure exceeding the limit: beyond the calibration range of the sensor (commonly -30 ℃~160 ℃), a heat dissipation or pressure reduction device needs to be installed System configuration error, parameter settings do not match: parameters such as pipe diameter, medium type (water/oil/gas), range, etc. need to be matched with the physical object. Signal processing exception: Converter water ingress or circuit board failure can cause signal decoding failure Quick troubleshooting steps: ① Check if the installation spacing of the sensor meets the formula requirements (pipe diameter x coefficient) ② Clean the surface of the transducer and reapply the coupling agent ③ Confirm that the pipeline is full and the flow rate is greater than 0.3m/s ④ Check if the parameter settings match the actual medium ⑤ Use an analog signal generator to detect if the converter is working properly. If the above operation is ineffective, a portable ultrasonic flowmeter should be used for on-site calibration and comparison, or contact the manufacturer to test the sensor transmission power.
Ultrasonic flowmeter wiring is mainly divided into two parts: host wiring and probe wiring. There are differences between different brands and models, so 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 connected1.
2. Terminal 3 (GND, DN -, DN+), usually only need to be connected to DN - and DN+(terminals 2 and 3) - Upstream probe connected
4.
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
1. T
1. GND - Return terminal TX
2. T
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
