Current position > Product detail
『The flow meter displays negative numbers』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. What is the reason for the negative pressure of the flowmeter?
When the flowmeter pressure displays negative, it is usually caused by three types of problems: measurement system, process system, or instrument failure. one Measurement system issue ① Zero drift: After long-term use of the flowmeter, the sensor may experience zero drift, causing a change in the starting measurement point and displaying negative pressure. ② Improper installation: If the installation position vibrates violently or the pressure port is blocked, it may interfere with sensor data and cause negative values. two Problem with the Gongyu Zhaoyi system: ① Abnormal fluid flow: When the pipeline suddenly changes diameter or the valve quickly closes, the fluid forms vortices or local negative pressure, manifested as negative pressure. ② System suction phenomenon: If there is a vacuum pump or other equipment running in the system, the pressure in the suction area may be lower than atmospheric pressure, resulting in negative display. three Instrument malfunction ① Sensor damage: When the sensor is damaged due to aging, corrosion, or external forces, the measurement may be inaccurate and negative pressure values may occur. ② Signal transmission issues: Short circuits, open circuits, or poor contacts in the circuit can cause signal distortion, resulting in incorrect negative values being displayed. During processing, step-by-step troubleshooting can be carried out: first check the installation and pressure port status, then observe whether there are suction or flow abnormalities in the system, and finally verify whether the instrument itself is faulty by calibrating or replacing the sensor.
2. What are the reasons for negative numbers 
The main reasons for negative numbers in electromagnetic flow meters are as follows: when the measuring pipeline is empty or not filled with the measured medium, the flow meter may display a negative number or the flow value may fluctuate greatly when there is gas in the measuring pipeline.
. Solution: Ensure that the pipeline is filled with the measured medium, so that the flowmeter has the correct measurement conditions. Reverse connection of sensor signal line: The electric wax bundle celery magnetic flowmeter has forward and reverse flow measurement functions. If the sensor signal line is reversed after the wheel is turned, it will cause the display of reverse flow, that is, negative numbers. Solution: Check and replace the connection of the signal line to ensure that it is correctly connected. Incorrect installation direction of sensor: If the sensor is not installed correctly according to the flow direction identification, it will cause the measurement direction to be opposite to the actual flow direction, resulting in negative numbers. Solution: Reinstall the sensor and ensure that it is installed correctly according to the flow direction indicated by Zheng Ji.3. What are the reasons for negative values in electromagnetic flow meters?
If the flow rate of an electromagnetic flow meter displays negative values during installation or operation, there may be the following reasons:
1. The measurement pipeline is empty or not filled, and there is gas present.
. At this point, the flow meter will display negative numbers or fluctuating flow values. Solution: Fill the pipeline with the measured medium to enable the flowmeter to measure the circle.2