Vortex flowmeters have become one of the most popular instruments in industrial flow measurement — loved for their simple structure, high reliability, and wide applicability.

However, many users report issues like inaccurate readings, signal instability, or even instrument failure soon after installation. In most cases, the problem isn’t the meter itself — it’s the installation.

In fact, over 90% of vortex flowmeter failures can be traced back to improper installation. Below are six often-overlooked installation details that can make or break your flow measurement accuracy.

1. Ignoring Straight Pipe Length Requirements

This is one of the most frequent and damaging mistakes.
Vortex flowmeters are highly sensitive to flow profile distortion, so the correct straight pipe length is critical.

  • Ensure at least 10D upstream and 5D downstream of straight pipe (where D is the pipe diameter).
  • If there’s a valve, bend, or reducer upstream, you may need even longer sections to stabilize the flow.

Failing to meet these conditions causes unstable vortices and fluctuating readings — even the best meter can’t compensate for bad installation.

👉 Learn more about how vortex flowmeters work and why straight pipe length matters.

2. Misaligned or Intruding Gaskets

During flange installation, the gasket must align perfectly with the pipe bore.
If the gasket protrudes into the flow path — even slightly — it creates turbulence and distorted vortex shedding, leading to continuous signal interference.

This often results in positive bias errors or unstable measurements that are hard to troubleshoot later.
Always inspect the gasket position before tightening the bolts.

3. Flow Direction Reversed

It may sound basic, but it happens more often than you think.
Always check the arrow marking on the flowmeter body and ensure it matches the actual flow direction.

Installing the meter backward will not only prevent accurate measurement but can also damage the internal bluff body or sensor module.

👉 Need guidance? See our vortex flowmeter installation guide for step-by-step instructions.

4. Mounting Too Close to Vibration Sources

Vortex flowmeters detect flow by sensing vortex frequency, which can easily be disrupted by mechanical vibrations.

Avoid installing the meter near pumps, compressors, or control valves. If relocation is impossible, use vibration-damping supports or flexible connections to isolate vibration from the instrument.

Ignoring this rule often leads to unstable output signals and erratic readings that mimic flow noise.

5. Air Bubbles in Liquid Measurement

When measuring liquids, trapped gas or bubbles inside the pipe are a major source of error.
Vortex flowmeters require a completely filled pipe to operate correctly.

  • Avoid installing the meter at the highest point of a pipeline.
  • If bubbles are unavoidable, install a gas separator or air vent upstream to remove them.

Even small air pockets can cause false vortices and inconsistent flow data.

6. Incorrect Temperature and Pressure Sensor Placement

For applications requiring temperature and pressure compensation, the positioning of measurement points is crucial.

  • The pressure tap should be located downstream of the flowmeter.
  • The temperature sensor should also be installed downstream.

Reversing these positions causes calculation errors and significant deviations in mass or energy flow results — especially in steam applications.

Conclusion: Precision Starts with Proper Installation

A vortex flowmeter is an installation-sensitive instrument. No matter how advanced your device is, improper installation will lead to inaccurate data and potential equipment failure.

By following these six key installation rules — ensuring straight runs, correct alignment, vibration isolation, and proper sensor placement — you can unlock the full accuracy and reliability of your vortex flowmeter.

Remember: A small installation mistake can cause big losses, but attention to detail guarantees long-term performance and confidence in every measurement.