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Home > Ultrasonic Flowmeter and other flowmeters selection Guide

 

The basis of good flow meter selection is a clear understanding of the requirements of the particular application. Therefore, time should be invested in fully evaluating the nature of the process fluid and of the overall installation.
When choosing flowmeters, one should consider such intangible factors as familiarity of plant personnel, their experience with calibration and maintenance, spare parts availability, and mean time between failure history, etc., at the particular plant site. It is also recommended that the cost of the installation be computed only after taking these steps. One of the most common flow measurement mistakes is the reversal of this sequence: instead of selecting a sensor which will perform properly, an attempt is made to justify the use of a device because it is less expensive. Those "inexpensive" purchases can be the most costly installations.
The first step in flow sensor selection is to determine if the flowrate information should be continuous or totalized, and whether this information is needed locally or remotely. If remotely, should the transmission be analog, digital, or shared? And, if shared, what is the required (minimum) data-update frequency? Once these questions are answered, an evaluation of the properties and flow characteristics of the process fluid, and of the piping that will accommodate the flowmeter, should take place. 
Here are some key questions which need to answered before selecting a flowmeter: 
•Is the fluid clean? 
•If the liquid is not water, what viscosity is the liquid? 
•Do you require rate measurement and/or totalization from the flow meter?
•If this is a process application, what is the size of the pipe? 
•Do you require a local display on the flow meter or do you need an electronic signal output?
•What is the minimum and maximum process pressure? 
•What is the minimum and maximum process temperature? 
•Is the fluid chemically compatible with the flowmeter wetted parts?
•What is the minimum and maximum flowrate for the flow meter? 
•What power supply available, AC power, DC power,battery powered or solar power?

 

The basis of good flow meter selection is a clear understanding of the requirements of the particular application. Therefore, time should be invested in fully evaluating the nature of the process fluid and of the overall installation.

 

When choosing flowmeters, one should consider such intangible factors as familiarity of plant personnel, their experience with calibration and maintenance, spare parts availability, and mean time between failure history, etc., at the particular plant site. It is also recommended that the cost of the installation be computed only after taking these steps. One of the most common flow measurement mistakes is the reversal of this sequence: instead of selecting a sensor which will perform properly, an attempt is made to justify the use of a device because it is less expensive. Those "inexpensive" purchases can be the most costly installations.

 

The first step in flow sensor selection is to determine if the flowrate information should be continuous or totalized, and whether this information is needed locally or remotely. If remotely, should the transmission be analog, digital, or shared? And, if shared, what is the required (minimum) data-update frequency? Once these questions are answered, an evaluation of the properties and flow characteristics of the process fluid, and of the piping that will accommodate the flowmeter, should take place.

 

Here are some key questions which need to answered before selecting a flowmeter:

•Is the fluid clean?

•If the liquid is not water, what viscosity is the liquid?

•Do you require rate measurement and/or totalization from the flow meter?

•If this is a process application, what is the size of the pipe?

•Do you require a local display on the flow meter or do you need an electronic signal output?

•What is the minimum and maximum process pressure?

•What is the minimum and maximum process temperature?

•Is the fluid chemically compatible with the flowmeter wetted parts?

•What is the minimum and maximum flowrate for the flow meter?

•What power supply available, AC power, DC power,battery powered or solar power?