List the five major faults of target-type intelligent flowmeter and their troubleshooting methods

Target-type intelligent flowmeter faults and troubleshooting methods:

1. The flowmeter has no indication or no signal. The main reasons are the following four

: a. The power supply has poor contact or falls off;

treatment method: For flowmeters with built-in batteries, check whether the battery is installed firmly, whether the contacts are good, and whether the battery has power. For external power supplies, check whether the connection between the connecting wires is intact, whether the wires are conductive, and whether the external power supply is normal.

b. The flowmeter circuit is damaged;

treatment method: return to the factory for repair.

c. The display screen is damaged;

treatment method: return to the factory for replacement.

d. The user signal receiving system is faulty;

treatment method: check and troubleshoot.

2. The target-type intelligent flowmeter has a large measurement error. There are many reasons for this phenomenon. The main reasons are the following:

a. During installation, the relative concentricity of the flowmeter and the connecting pipe is greatly misaligned, and the sealing gasket is not concentric, thus forming a throttling resistance, which greatly affects the flow state of the measured medium;
treatment method: adjust the installation status.

b. The straight pipe sections before and after the flowmeter are too short, and elbows, valves and other components that greatly interfere with the flow state of the measured medium are installed directly in front of the flowmeter;

treatment method: install according to the requirements of the instructions or calibrate the flowmeter on the spot.

c. The bypass pipeline is leaking;

treatment method: check and replace the bypass pipeline.

d. There are ribbon-like debris wrapped around the target plate, which increases the force on the target plate;

treatment method: refer to the previous method for dealing with debris.

3. The indication of the flowmeter has been zero during operation. The main reasons for this phenomenon are:

a. The force-bearing element (target plate) falls off, resulting in the sensor being unable to sense;

treatment method: assemble a target plate of the same specification.

b. The flowmeter sensor has no voltage output signal;

treatment method: first determine whether the sensor is damaged. The specific method is to see if the sensor data has changed.

c. The flow rate of the measured medium is too small, lower than the minimum scale flow rate of the flowmeter;

treatment method: return to the factory and replace the force-bearing element.

4. When the flow velocity of the measured medium in the pipeline is zero, the instantaneous flow value indicated by the target intelligent flowmeter is not zero. The main reasons for this phenomenon are:

a. The horizontality of the flowmeter before and after installation is inconsistent, so that the target plate and the target rod produce axial horizontal force due to inclination, resulting in the existence of instantaneous flow;

b. The flowmeter has been running for a long time, and the internal stress of its sensor is released and slightly changed;

c. During the installation or operation, serious overload causes zero drift;

the above three methods can refer to the steps and methods of zeroing the flowmeter.

d. The grounding of the flowmeter shell is poor;

treatment method: the user re-grounds.

e. The target plate, target rod and measuring tool are stuck by debris;

treatment method: close the valves before and after the flowmeter, use tools to loosen the connecting bolts between the transition part of the flowmeter and the measuring tube, and gently shake the transition part or remove it, clean up the debris and reset it as it is.

5. The indication of the flowmeter increases abnormally during operation. The main reasons for this phenomenon are:

a. There are filamentous and ribbon-like debris hanging on the target plate and the target rod;

treatment method: refer to the method for handling debris.

b. Under high contamination conditions, the target plate and target rod will be seriously contaminated, which will increase the projected area of ​​the target plate of the force-bearing element along the axis of the measuring tube, that is, the annular flow area between the target plate and the measuring tube will be reduced. Then, at the same flow rate, the force on the sensor will increase, which will eventually lead to an abnormal increase in the flow indication.

Treatment method: remove the transition component and use tools to remove the contamination on the target plate, target rod and the inner wall of the measuring tube.