Analysis of common faults and causes of vortex flowmeter

Serial number

Fault phenomenon

cause of issue

Approach

1

Output signal when there is no flow after power-on

Input shielding or poor grounding, introducing electromagnetic interference

Improve shielding and grounding, and eliminate electromagnetic interference

The instrument is close to strong electrical equipment or high frequency pulse interference source

Keep away from interference sources and take isolation measures to enhance power supply filtering

The pipeline has strong vibration

Take vibration reduction measures to enhance signal filtering and reduce amplifier sensitivity

Converter sensitivity is too high

Reduce sensitivity and increase trigger level

2

No output signal after power-on

Power failure

Check power and ground

Input signal line disconnection

Check signal lines and terminals

A certain level of amplifier is faulty

Check the working point, check the components

Detecting original damage

Check sensor components and leads

No flow or too small flow

Check valve to increase flow or reduce pipe diameter

The pipe is blocked or the sensor is stuck

Check the cleaning pipe and clean the sensor

Vortex body scaling

Cleaning vortex generator

3

Output signal is not stable

Strong electrical interference signal

Strengthen shielding and grounding

Sensor is contaminated or damp, sensitivity is reduced

Clean or replace the sensor to increase the gain of the booster

Sensor sensitivity is too high

Reduce the gain and increase the trigger level

Damaged sensor or poor lead contact

Check sensor and lead

Two-phase flow or pulsating flow

Strengthen process management to eliminate two-phase flow or pulsating flow

Pipeline vibration

Take vibration reduction measures

Process instability

Adjust the installation location

The sensor is installed with different hearts or gaskets protruding into the tube

Check the installation and correct the inner diameter of the seal

Upstream and downstream valve disturbance

Lengthen straight pipe or add flow regulator

Fluid is not filled with tubing

Change the location and method of loading the flow sensor

Body wrap

Elimination of wraps

Cavitation

Reduce flow rate and increase pressure inside the tube

4

Large measurement error

Insufficient length of straight pipe

Lengthen straight pipe or add flow regulator

Analog conversion circuit zero drift or full scale adjustment is wrong

Calibrate the zero and span scales

Supply voltage changes too much

Check the power supply

The meter exceeds the verification period

Timely inspection

The difference between the inner diameter of the sensor and the pipe is large

Check the inner diameter of the pipe and correct the meter factor

Install different hearts or seals into the tube

Adjust the installation, trim the gasket

Sensor contamination or damage

Cleaning replacement sensor

Two-phase flow or pulsating flow

Eliminate two-phase flow or pulsating flow

Pipe leak

Exclude leaks

5

Measuring tube leak

In-tube pressure is too high

Adjust tube pressure and change installation position

Nominal pressure selection is wrong

Use high-grade nominal pressure sensor

Seal damage

Replacement seal

Sensor is corroded

Take anti-corrosion and protection measures

6

Abnormal whistling of the sensor

The flow rate is too high, causing strong vibration

Adjust flow or replace large gauges

Cavitation

Adjust flow and increase flow pressure

Body loosening

Fastening body

7

Traffic accumulation counter does not work

Counter wheel mechanism is not flexible or stuck

Cleaning the counter gear or replacing the counter

Counter coil off

Rewind the coil or replace the same spare part

Coefficient setting and programmer component circuit failure

Repair the corresponding component circuit or replace the corresponding component

Display board front panel component circuit failure

Repair the corresponding component circuit or replace the corresponding component

Vortex transmitter has no output

Repair or replace the transmission unit

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