WHAT IS A FTI TURBINE FLOW METER AND WHY CALIBRATE IT?

WHAT IS A FTI TURBINE FLOW METER AND WHY CALIBRATE IT?

A Flow Technology (FTI) turbine flow meter measure the flow of liquids and gases, usually through pipes. FTI turbine flow meters measure flow on a volumetric basis and are known to be extremely accurate. In order to ensure a turbine flow meter lives up to its accurate reputation, frequent calibration of the device is necessary.

HOW A TURBINE FLOW METER WORKS

A turbine flow meter consists of a multi-bladed rotor and bearing assembly, which is mounted to a support device. This assembly is then mounted inside a housing unit that has a known internal diameter. As fluid runs through the housing unit, the rotor spins at a proportional rate. This rate is consistent with the volume of liquid passing through the housing unit. To detect the passage of each rotor blade, a magnetic carrier pick-off sensor is used. This sensor also helps to generate the frequency output. Once the frequency output is generated, it can be read directly with the end users electronics or it can be further processed to convert it to an analog output.

WHY CALIBRATE A TURBINE FLOW METER?

Comparable to many other measuring devices, turbine flow meter calibration can and will drift. Here are some common reasons flow meters drift and when they should be calibrated:

  • Deposits on internal surfaces of the meter such as salt or other minerals. This can occur on meters with and without moving parts. Even if everything seems to be working properly, this can severely impact your meter’s ability to perform as it should.
  • Chemical wearing on any level can affect your turbine flow meter calibration, especially flow meters with moving parts as the small wearing can greatly affect the movements and overall geometry of your meter.
  • Abuse of the a turbine flow meter. This can be either an accidental drop of the meter, over speeding, etc. The meter may seem ok on the outside, but its performance could have been compromised.
  • The age of your meter. Older meters will have changed from their original performance due to use, wearing, electrical changes and other factors over time.
  • Changes in fluid property. If your turbine flow meter was calibrated in one type of fluid and used in another type of fluid you may see a difference in performance. A change in fluid property can and will affect all types of flow to some extent but it is possible to make corrections to compensate for these changes.
  • A turbine flow meter may not have been installed properly and this can lead to major inconsistencies in operation.
  • External influences will always effect your turbine flow meter calibration and performance regardless of what kind of meter you have. Factors such as vibration, temperature, pressure, electromagnetic interference, etc.

5 QUESTIONS TO ASK BEFORE CHANGING CALIBRATION INTERVALS

At what point do you need to change your calibration intervals?
Read our guide to find out.

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