1、 No traffic, signal
Is there any vibration?
In today's world, stress type vortex flowmeters have two-dimensional anti vibration performance As stated in the principle, it can resist external vibration in the direction of fluid resistance and vortex lift, but not in the direction of vortex lateral thrust.
Testing: Feeling
(1) Slight vibration:
Solution: ① External mechanical vibration reduction measures, such as using rubber soft joints, pads, etc. for vibration reduction Fix the pipeline with a bracket.
② Adjust parameters to eliminate vibration.
DY type adjusts the corresponding parameters
The premise is that K25 must be in manual mode, i.e. MANU (01) state
K10:(TLA) 0.1 TO 20.0 ↑
K20:(db) 0.1 TO 20.0 ↓
K26:(N.B) 0.0 TO 2.0
Attention: The adjustment of the above parameters will affect the lower limit of the flow rate, especially the adjustment of the gain, which needs to be gradually adjusted because it has a significant impact on the lower limit of the flow rate.
(2) Severe vibration
Construction: Adopt strong anti vibration measures such as installing rubber cushions.
2. Is it 50Hz power frequency impedance?
Frequency meter measurement
Is the output method of the conversion amplifier incorrect?
Can simultaneously output current and pulse signals
4. Is the wiring correct?
For combination type, there is generally no error, and errors are mainly caused by split typeIf the cable is connected incorrectly and the result is usually 50HZ, and the impedance cannot be eliminated during the inspection of 50HZ impedance, whether it is grounding, floating, or adjusting parameters, then it is important to pay attention to whether it is a wiring error.
5. Is the amplifier damaged?
This requires special attention to the current output form Damage to the amplifier may result in a misleading current greater than 4mA.
Detection: Remove the amplifier and connect it in series with an ammeter to the circuit for power supply inspection.
Is there any high-power electrical equipment nearby?
Especially for welding machines, the high-frequency harmonics generated will cause the flowmeter to have no flow and signal
Inspection: On site survey
7. Has water entered the wiring chamber?
Especially in the current output mode, a bypass current is formed between the positive and negative terminals due to the conductivity of water, resulting in the phenomenon of no flow and signal.

2、 There is traffic but no signal
Is the wiring correct?
(1) Does the voltage of the power supply meet the requirements?
*DY--------------10.5~42V
The power of the power supply only needs to be greater than 1VA
(2) Is the power polarity connected correctly?
Current output type, the positive and negative connections of the power supply are reversed, resulting in no signal and not even 4mA
(3) Separated typeIs the cable connected correctly?
2. Is the conversion amplifier damaged
For current output type
3. Is the body damaged?
Testing: Using capacitance measurement method
4. Is the actual process flow too small?
Inspection: tapping method
Regularly and continuously tapping any type of flow meter near the pipeline near the flow meter will result in a flow rate reading. If the measured medium is liquid, a good empty tube test will be conducted Because the liquid itself is a vibration absorber.
Solution: Replace the flow meter with a smaller diameter or increase the flow rate if process conditions permit.
5. Is the gap between the body and the shell stuck by fine particles?
Inspection: Comprehensive judgment method
This phenomenon usually occurs when the machine is shut down and restarted after normal operation. If it is confirmed that the conversion amplifier and the piezoelectric chip of the generator are intact and undamaged, especially when the measured material is liquid, it can generally be considered as this type of fault.
Solution: If the production process conditions permit, increase the flow rate as much as possible and use a wooden hammer to strike vertically on the welding table below the flowmeter, so that the negative pressure generated by the high-speed fluid can carry away fine solid particles.
6. Are the parameter settings incorrect?
DY: In addition to the above situations, incorrect parameter settings can also cause traffic but no signal
*DY:B20,B45,C20

3、 Unstable traffic signal
Is the sealing gasket concentric during installation?
Inspection: On site observation
Solution: If not correct, reinstall
2. Does the process pipeline meet the requirements?
3. Is the selection incorrect?
Inspection: If the process conditions permit, increase the flow rate. If the flow rate stabilizes, proceed with replacing the flow meter with a diameter of one level.
4. Is there a two-phase flow of liquid and gas, liquid and solid, or gas and solid in the fluid?
The vortex flowmeter can only measure single-phase flow and cannot measure two-phase flow. This is determined by the working principle of the vortex flowmeter, which can only be judged based on experience or fluid properties, working conditions, pressure, temperature, etc., to determine the presence of liquid gas, liquid-solid gas-solid two-phase flow. If the medium is liquid ammonia, light hydrocarbons, or other easily occurring liquids.
Solution: (1) For liquid two-phase flow, a filter can generally be installed at the upstream end of the flowmeter.
(2) If it is a two-phase flow of liquid and gas, a deaerator can be installed at the upstream end of the flowmeter.
5. Does the flow meter and flow regulation control system produce system oscillations?
Inspection: Manual testing method
Set the door opening controller of the control system to manual mode. When the valve is opened to a certain value, if the flow display is stable or slightly moving, it indicates that there is system oscillation.
Solution: Re evaluate the PID algorithm or take other effective measures.
6. Are there fine solid particles that form residual liquid and scale in the gap between the body and the vessel?
7. Is there any fibrous material wrapped around the body?
If fiber material is wrapped around the body, it will greatly weaken the vortex force of the vortex. Due to the effect of the vortex, the fiber material swings with the fluid, causing fluctuations in the flow rate display of the vortex.
Inspection: Disassembly inspection
Solution: Clear and reinstall.
8. Are the parameter settings incorrect?
For DY type, parameters such as D10, (K10, K20, K26, etc.) will have an impact on the stability of flow display.

4 Large flow measurement error
All the fault phenomena in the third major question are factors that cause large errors.
2. Does gas measurement without temperature and pressure compensation not discuss accuracy?
3. Are the empirical data values before using the flowmeter true and reliable?
4. Are the parameter settings incorrect?
DY type, pressure temperature, medium, density and other parameters must be adjusted according to the actual working conditions.
Processing: Correction
5. Are the parameters of the supporting secondary instruments set correctly?
Current input method:
Because it is a current input method, it is required that the pressure, temperature, and range parameters of the flowmeter conversion amplifier must match the pressure, temperature, and range parameters of the secondary analog meter.