- Ultrasonic flow meters - technologies and how to select

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Title: Ultrasonic flow meters - technologies and how to select
Keywords: ultrasonic,flowmeter, flow meter,liquid, water, ultrasonic flowmeter, ultrasonic flowmeters, oil,handheld,portable, wall-mount, flow, measurement,transit time,transit-time,clamp-on,clamp on, wetted, ...
Description:The low-cost ultrasonic flowmeters for liquids and advanced solutions for flow measurement applications. is ranked 25408406 in the world (amongst the 40 million domains). A low-numbered rank means that this website gets lots of visitors. This site is relatively popular among users in the united states. It gets 50% of its traffic from the united states .This site is estimated to be worth $2,503. This site has a low Pagerank(0/10). It has 1 backlinks. has 43% seo score. Information

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Purchase/Sale Value:$737
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Keyword Count Percentage
ultrasonic 19 2.79%
flowmeter 35 4.71%
flow meter 3 0.43%
liquid 9 0.78%
water 4 0.29%
ultrasonic flowmeter 11 3.24%
ultrasonic flowmeters 4 1.21%
oil 2 0.09%
handheld 7 0.81%
portable 1 0.11%
wall-mount 5 0.72%
flow 62 3.67%
measurement 8 1.27%
transit time 1 0.17%
transit-time 8 1.39%
clamp-on 5 0.57%
clamp on 1 0.11%
wetted 5 0.43%
... 1 0.04% Similar Website

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Ultrasonic flow meters - technologies and how to select Home | Technology | Products | Contact us Articles How to Select the Right Ultrasonic Flowmeter for Your Application Principles of a Transit-Time Based Ultrasonic Flowmeter Ultrasonic Flow Measurement Technologies: Transit-time, Doppler, Cross Correlation, and Pulse Doppler Profiling Information Request All About Ultrasonic Flowmeters Ultrasonic flowmeters are very promising instruments for pipe flow measurement in process control, flow survey, custody transfer etc. They have many advantages over conventional flowmeters as will be explained later. In the following we are going to focus on how to select the right ultrasonic flowmeter for liquid applications. For information on how those flowmeters work, please visit the ultrasonic measurement technology page. Liquid ultrasonic flowmeters can be classified in many ways: (1) Based-on principle: Transit-time vs. Doppler A transit-time flowmeter is based on the time difference between upstream and downstream sound propagation intervals. It usually provides very good accuracy (about 1~2 percent). The former works well for clean flow or flow with minor particles. Applications include pure water, sea water, wash water, sewage, process liquids, oils, chemicals, and any homogeneous liquids which are capable of ultrasonic wave propagation. A Doppler flow meter is based on the Doppler effect. It works well with suspension flow where particle concentration is above 100ppm and particle size is larger than 100um, but less than 10% in concentration. Doppler is easier to make and less accurate (about 5 percent), thus, it is cheaper than transit-time flowmeter. Another not so popular flowmeter is cross-correlation based ultrasonic flowmeter. It works better for suspension flow or turbulent gas flow. (2) Based-on portability: Handheld vs. Wall-mount Handheld (or portable) flowmeer is very good for flow survey, HVAC and many applications where mobility is a concern. Another trend of using handheld flowmeter instead of wall-mount flowmeter is to save cost, since some handheld flowmeters (such as Regal Series RH20) can also be deployed as long-term measurement device if the environment is accommodating. Wall-mount (or fixed installation) flowmeter is more suitable for applications such as process control and long-term continuous flow monitoring. The instrument enclosure is normally weather-resistant or explosive-proof. Wall-mount is normally cheaper than handheld because it is usually ordered in large quantity. (3) Based-on transducer installation: Clamp-on vs. Wetted (Insertion and Flow Cell) Clamp on flowmeter is non-intrusive, easy to install and easy to maintain. The transducers are Featured Product The latest innovation of low-cost handheld ultrasonic flowmeter, RH20, is one of the most powerful flowmeters available for liquid flow measurement. It employees state-of-the-art digital signal processing and clamp-on ultrasonic transit-time measurement technologies for accurate and reliable flow measurement non-intrusively from out side of a pipe. In this compact and light package, many built-in features make the flowmeter an ideal tool for flow surveys (water, oil, chemicals, beverage, etc), HVAC and other closed-pipe applications. Click here to see NIST-traceable calibration results. Click here for a quick quote now! mounted out side of a pipe, thus, no need to cut the pipe or to drill holes on the pipe, and there is no direct contact thus no pollution to the liquid, no pressure drop, etc. Wetted flowmeter comes with two varieties, insertion and flow cell. Insertion flowmeter requires to dill holes on the pipe wall to install the transducers. Flow cell, also called spool piece, needs to be installed in line with the pipe, thus needs pipe fitting, etc. The transducers are pre-installed on the flow cell, thus, installation error has been reduced to minimum. In general, wetted transducer has better accuracy and better long-term stability than clamp-on type, but it might be more expensive. Comparing with conventional flowmeters, wetted type does not have moving parts, no interference to flow profile, no pressure drop and needs very little maintenance. (4) Based-on transducer scheme: Single-path vs. Multi-Path Single-path flowmeter utilizes one pair of transducers to form one ultrasonic path to intercept the flow in a pipe. It is suitable for small and medium size pipes. For large pipe size and very high accuracy needs, multi-path transducer installation may be considered. However, a multi-path flowmeter is much more expensive than a single-path flowmeter. It is usually used in custody transfer where accuracy is extremely important. Ultrasonic Flowmeter Selection Guide The most commonly used ultrasonic flowmer is transit-time based single-path flowmeter due to its high accuracy and reasonable cost. Depending on the applications, the selection of the right type of flowmeter may vary. You may need to answer the following questions before making the final decision: Is the pipe full? All ultrasonic flowmeters require that the pipe is full of liquids. There are some work around with partially-full pipe, but by no means you will get good results. Does the liquid have particles more than 200ppm and particle size larger than 75um (the number may be different for different manufacturers)? If yes, use Doppler. Otherwise, consider transit-time. Does the liquid temperature fall into the transducer temperature range? Press range in the pipe (if you select wetted transducer)? High accurate the measurement should be? In general, multi-path is higher than single path, flow cell is better than insertion, and insertion is better than clamp-on. However, if you have on-site calibration facility, the story will change. Do you want to easily move the flowmeter around? What output signals you need? What functionalities you want? Analog? Digital? RS232? Data logger? What are the safety requirements? Pipe size range? Pipe material? Lining? Flow rate range? Enough straight pipe length? In order to guarantee the result accuracy, it is normally recommended to have 15 times of pipe diameter straight pipe run at the measuring site. If there is a pump or valve on the upstream, the straight length should be increased. The financial budget. The above questionary seem overwhelming if this is the first time you are looking for a ultrasonic flowmter. Please do not be scared. Most likely, a simple clamp-on transit time handheld flowmeter or wall-mount flowmeter will suit your application. If not, please feel free to contact us for detailed suggestions. In the past few years, ultrasonic flowmeter price has been going down significantly. However, it is still expensive comparing with conventional flow meters. In order to win the market over conventional flowmeters, a revolutionary price reduction must be achieved. The good news is that this kind of low cost, high quality products have already been taken off to the market. The ... Whois

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