Vortex flowmeter error maintenance method

Large vortex street meter measurement error maintenance method

Vortex flow transmitter is one of the more common types of flowmeters. It has high performance and beautiful appearance. Let us take a look at the failure and maintenance methods of the vortex flow transmitter.

First, the larger flow measurement error

1. The fault phenomena of all the third topics are the factors that cause large errors.

2, gas measurement without temperature and pressure compensation, do not discuss the accuracy.

3. Is the value of the empirical data before the flowmeter used true and reliable? 4. Is the parameter setting incorrect? Check: Open the data item for review.

1 For the cumulative meter head of CD type, the operation circuit is a logic circuit, and the factory calibration operation circuit value is 8888 (BCD code). The user must reset the operation coefficient according to the actual working condition to accumulate the meter head for accurate calculation.

2 For E, DY type, pressure temperature, medium, density and other parameters must be adjusted according to actual conditions. Processing: Corrections.

Second, the flow signal is unstable

1. Is the sealing gasket concentric when installed? Inspection: On-site observation.

Processing: Reinstall.

2. Does the process pipeline meet the requirements? The vortex flowmeter is a typical fluid oscillating flowmeter, and the front and rear straight pipes must be guaranteed. Especially when measuring the gas, if it does not meet the requirements, the flow signal will be unstable. General: Gas ------before 10 in 10, liquid ------ in 10 before 5 5. However, in the following cases, the length of the pipe should be lengthened before and after.

Check: If process conditions permit, increase the flow rate. If the flow rate is stable, handle: Replace the flowmeter with a smaller diameter.

3, whether the selection is wrong? If the type is wrong, the common flow is in the non-linear area, even near the critical dead zone, then the flow fluctuation may occur.

4. Is there liquid gas, liquid solid or gas-solid flow 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 meter.

Inspection: The existence of liquid gas, liquid-solid, gas-solid two-phase flow can only be judged by experience, or according to the nature of the fluid and the pressure and temperature of the working conditions. If the medium is liquid ammonia, light volatile and other volatile liquids. Treatment: (1) For liquid, if it is a liquid-solid two-phase flow, a filter can generally be installed at the upstream end of the flowmeter.

Through the above explanation, we understand the vortex flow transmitter common faults and maintenance methods, but also know that the vortex flow transmitter is suitable for high-pressure measurement, the meter body does not have to open the hole, easy to make high-pressure instrument.