Models and Types of Flow Meter

Models and types of flow meter that populated the market is quite varied where types can be adjusted to flow meter’s functions and flow meter’s applications in the field. These matters are worth noticing to be used as our referrence whenchoosing types of flow meter that suits our needs.
Engineers need to know the model and type of flow meter that is going to be used, with first choosing what model compatible with the production process and the purpose of installation of the flow meter. The model and type of flow meter usually also chose based on the purpose and benefits of the flow meter itself. The selection of the type and type of flow meter is usually adjusted by the type of fluids measured, the environmental conditions, the amount of flow, and the most important is the accuracy of the flow meter readings.
Depends on the flow meter methods, can be divided into some type of flow meter:

1. Ultrasonic Flow Meter

Ultrasonic flow meter is a measurement tool with method of indirect measurement (inferensial), because sensor does not measure the speed of the fluid in the pipe directly, instead it measures different in time of transit (differential transit time), by measuring time of transit of the sound pulse with high-frequency (high-frequency sound pulses) which travels in the pipe with fluid flow. Time of transit or transit time is time needed by sound pulse to travels along the pipe in two direction, in the same direction as the flow and the opposite direction. Difference in time between the two equals with average speed of the fluid flow. Because it measurement based on transit time, this method also called ultrasonic transit time flow meter.

Ultrasonic can be defined as many things. Since  Portable Ultrasonic flow meter became popular, technicians think that flowmeter is a Portable Ultrasonic flowmeter. However, ultrasonic flowmeter is a tool that is needed to measure flow velocity, volume, mass flow from liquids or gases with characteristics which can be moved around.

There are numerous company that tried to develop this technology to be applied on steam, but so far the application of this tool is still uncommon and very limited. Ultrasonic flow meter so far has been made in various types and applications ranging from transmit time or Doppler as base flow or liquid flow, low anemometer to describe the high cost of natural gas as a housing transfer application. The price for an  ultrasonic flow meter can range from USD 25 to USD 150,000 depending on the application, and there are also hand held ultrasonic flow meters.

Principle of Operation

Basically people will distinguish one technology from two types of measurement techniques but this is not entirely true. An Ultrasonic flowmeter will be categorized into Doppler type (which is used to shift the Doppler principle). Or time transfer equipment in the form of measuring time difference. This difference may have brought a fairly simple reason to easily classify ultrasonic in the industry. If someone learns ultrasonic flowmeter measurement techniques, they will find several technologies that might be wrongly classified.

In this case, Doppler flow meter has Doppler shift which measures using continous wave in constant frequency or variations such as changes happening inside the Doppler shift is measured using vibrations.

In Ultrasonic flowmeter, transmission from wave that passes the sensor indirectly connected with fluids, is called non-contact type. There can also be missconception or simplification on transit time flowmeter.

Some information classified the new type as “phase shift” and compared to the older type which in starting meter uses “transit time“ and other uses “Correlation transit time“.

Now a combination of the two transits is now made with ultrasound technology, this makes it possible to know exactly how many functions and calculations of the actual technique.

Ultrasonic Flow meter type is this is quite popular especially for those who want the type of flow meter that can be moved around or in other words it is portable and it is also referred to as a Hand-held flow meter.

Its operations method is quite simple, just clamp it on to the pipe which flow is going to be measured. For the output of the flow meter, while it can only be read on the display, there are also those equipped with printers so that the measurement results can be directly stored as hard copy, and there are also measurement results that can be stored on the memory card in the form of soft copies that can be read directly by the computer using a card reader.

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