Target flowmeter troubleshooting

1. When the flow velocity of the measured medium in the pipeline is zero, the instantaneous value of flowmeter indication is not zero. The main causes of this phenomenon are:

a. Before and after the installation of the flowmeter, the horizontality is inconsistent. As a result, the target plate and the target rod generate an axial horizontal component due to the tilt, resulting in the presence of instantaneous flow;

b. The long-term operation of the flowmeter causes a slight change in the internal stress release of the sensor.

c. In the process of installation or operation, serious overload causes zero drift;

The above three ways can refer to the procedures and methods of flow meter zeroing.

d, bad flowmeter housing ground;

Processing method: The user re-grounds.

e, stuck between the target, target, and gauge with debris;

Treatment method: Close the valve before and after the flowmeter, use a tool to loosen the connecting bolt between the excessive part and the measuring tube, and gently shake the transition part or take it out. After cleaning the debris, reset it as it is.

2. The abnormal increase of the value displayed in the flowmeter working process is caused by:

a. Filaments and ribbons are hung on the target and the target;

Treatment method: Refer to the method of handling debris.

b. Under high knot conditions, the target and target rods are heavily knotted, so that the projected area of ​​the force element target plate along the axis of the measuring tube increases, that is, the annular overcurrent area between the target and the measuring tube decreases, and thus the same. At the flow rate, the force of the sensor increases, eventually resulting in an abnormal increase in the flow indication;

Treatment method: Remove the transition part, and use the tool to remove the target piece and the target rod and the dirt on the inner wall of the measurement tube.

3, the measurement error is large, there are many reasons for this phenomenon, the most important reasons are the following:

a. The relative concentricity of the flow meter and the connecting pipe during installation has a large misalignment, and the sealing gasket is not concentric, thus forming a throttling resistance component, which greatly affects the measured device.

Mass flow

Treatment method: Adjust the installation status.

b. The straight section of the flowmeter before and after the flowmeter is too short, and the elbow is installed directly before the flowmeter. Valves greatly interfere with the flow-state components of the measured medium.

Treatment method: Install according to the specification or conduct real flow calibration of the flowmeter.

c. bypass pipe leakage;

Treatment method: Check and replace the bypass line.

d. Wrapped band-shaped debris around the target plate increased the force on the target plate;

Treatment method: Refer to the previous method of handling debris.

4, the flow meter without indication or no signal, the main reasons are the following four:

Target flowmeter

a, poor power contact or loss;

Treatment method: For the flowmeter with its own battery, check whether the battery is stable, whether the contacts are good, and whether the battery has electricity. For external power supply,

Check that the connections between the connection wires are intact, the wires are conducting, and the external power supply is normal.

b, flowmeter circuit damage;

Treatment method: Return to factory for repair.

c, display damage;

Treatment method: Replace the factory.

d, user signal receiving system failure;

Treatment method: Check and troubleshoot.

5, the value of the flow meter has been shown to be zero, this phenomenon is mainly due to:

a. The force element (target piece) falls off, resulting in sensor inability to sense;

Treatment method: Assemble the same size target.

b, flowmeter sensor no voltage output signal;

Processing method: first determine whether the sensor is damaged, the specific method is to see whether the sensor data changes.

c, the measured medium flow is too small, less than the flowmeter's minimum scale flow;

Treatment method: Return to factory to replace the force element.

Target flow meter - Jiangsu Huawei Yuanhang Automation Instrument Co., Ltd.

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