PTFM 6.1 achieves accurate readings in farming and irrigation applications

June 27, 2022 | Case Studies

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Overview

An agricultural management company known as DSG contacted Pulsar Measurement’s representatives in Chile, SFS Chile, and needed to find a flow measurement solution for measuring water consumption used for farming and irrigation.

Finding a portable solution for clean and dirty water.

DSG had an existing inline flow measurement solution, but they needed a solution that could be moved to various points on a 200 mm (8 in) water intake pipe to ensure each system was running smoothly. The issue was that this water comes from a local dam does not always stay clean due to various weather conditions (heavy wind or rain) that move sediments and debris into the water and cause the clean water to have more suspended solids. 

Since the water from the dam is usually clean, SFS Chile suggested testing the PTFM 6.1 Portable Transit-Time Flow Meter with SE16B transducers. The SE16B transducers would be the ideal solution with the PTFM 6.1 as they are recommended for 50 mm to 250 mm (2 in to 10 in) pipe sizes and are compatible with a wide range of pipe materials.

Although the application was within the specifications for the meter and transducer, their first attempt at measurement with the PTFM 6.1 resulted in no signal. Since the water occasionally runs turbid, they then decided to test the PDFM 5.1 Portable Doppler Flow Meter. Even though the PDFM 5.1 did prove to work well, SFS Chile wanted to give the PTFM 6.1 one more try, but this time, with the SE16C transducers.

Why transit-time instead of doppler in this case?

The PDFM 5.1 is a great solution when needing to evaluate a system’s performance, monitor or balance flow, or troubleshoot flow problems in full pipes where there is suspended air or solids, or more simply referred to as dirt. It is also ideal for measuring the flow of closed pipes from 15 mm to 4.6 m (0.5 in to 15 ft) and can be installed in minutes with just a single clamp-on transducer design.

Like the PDFM 5.1, the PTFM 6.1 is also a portable, clamp-on flow measurement solution that can be moved as needed to verify flow at different points. The SE16A, SE16B, and SE16C transducers that come with the meter allow you to measure flow on all common pipe materials with sizes ranging from 15 mm (0.5 in) to 1,200 mm (48 in). You can also view the convenient on-screen Flow Report where the daily total, minimum, maximum, and average flow rates are stored in a 24-hour summary for the last 365 days.

DSG’s application was different in that they needed to verify the flow of water that could sometimes be clean and sometimes dirty. Having a meter that could easily be adjusted to the application’s needs and still receive a strong signal was important as they wouldn't have to guess if the readings they were getting were correct or if the signal strength was sufficient. The three transducers that come with the PTFM 6.1 allow you to do just that!

The PTFM 6.1 Transit-Time Flow Meter comes out on top!

The PDFM proved there was a large concentration of suspended air or solids, but the ability of the PTFM 6.1 to power through and maintain a good signal with accurate readings picked up on what the DSG team needed. SFS Chile said, “Concerning this application, the PTFM 6.1 with the B and C transducers could measure in conditions that the PTFM 1.0 formerly could not.”

After such a great trial of the PTFM 6.1, DSG decided to move forward and purchase one to continue to test the flow at various points on their dam.

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