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Overview
Controlotron is one of the world's largest suppliers of instruments, which
measure and control the processing of liquids. Controlotron’s products can be found in
petroleum pipelines from Alaska to Saudi Arabia ... from Anheuser Busch's beer
vats to Proctor & Gamble's peanut butter processing plants ... from wastewater
treatment plants in the United States to potable water lines in China…and from
chilled water pipes to ballast control systems in the US
Navy's fleet of Trident submarines.
Controlotron’s standard line of flow control devices serve
13 different industries and a wide range of applications, including petroleum
pipelines, water and wastewater treatment facilities, heating and cooling systems,
fossil fuel and nuclear power facilities, chemical processing, aircraft hydraulics, food
processing, semiconductor and automotive.
Theory of Operation
WideBeam Technology
To understand WideBeam™ technology we must first explore the Transit-Time method of transmission.
Transit-Time and the Shear Mode approach...
A Transit-Time Flowmeter measures the effect of a liquid’s flow velocity on bi-directional acoustical signals. An upstream transducer (T1) sends a signal to a downstream transducer (T2) that, in turn, sends a signal back. When there is no flow the time to go from, T1 to T2 is the same as the time going from T2 to T1. However, when there is flow, the effect of the liquid’s flow velocity on the acoustical signal is to speed up the signal in the up to downstream direction and slow up the signal in the down to upstream direction. This creates the time difference by which the flow velocity, and ultimately the volumetric flow rate, is determined. The following equation is used as a basis for determining the liquid's flow velocity.
Vf=Kdt/TL |
The WideBeam™ approach...
With the arrival of the microprocessor, and its incorporation into the Transit-Time Flowmeter, this technology has taken a major step forward. The microprocessor allows a flowmeter to improve its signal discrimination and computation capabilities to a point where problems due to varying liquid characteristics, like entrained gasses, suspended solids, temperature and viscosity, can easily be overcome.
What sets the Wide-Beam™ technology apart from Shear-Mode is the way the sonic wave is injected into the pipe and then the liquid. With Shear-Mode Technology the signal is injected into the pipe wall at one frequency regardless of pipe wall thickness. The transducers remain the transmitting device and use the pipe wall as a medium between the transducer and the liquid. Example of Sheer mode can be seen in Illustration 1.
With WideBeam™ technology the sonic wave is injected into the pipe wall at the resonant frequency of the pipe wall and at a given angle. The transducer excites the pipe wall causing it to become the transmitting device.
This is ideal when measuring liquids of varying properties because the receiving transducer can be placed virtually anywhere in the path of the ongoing sonic wave and it will receive a signal regardless of the refraction angle of the liquid signal. This technology is not at the mercy of temperature or liquid changes and is less susceptible to entrained gasses and solids, due to a higher return signal.
WideBeam™ technology is superior because the signal is able to traverse along the pipes axis. This makes for a stronger signal over a longer period of time and is useful in overcoming conditions such as high levels of entrained gas or solids and dense liquids. Illustration 2 and Illustration 3 show the advantage of WideBeam™ technologies.
As the wave propagates through the transducer to the end of its footprint, you will note that the signal appears to inject itself into the pipe wall as if it were entering at a 90 degree angle. In this case the wave is actually undergoing a mode conversion from longitudinal to shear mode as it leaves the transducer and enters the pipe, then back to longitudinal mode as it enters the liquid. Additionally, when the wave first enters the pipe, at the beginning of the transducers footprint, it begins to resonate within the pipe wall. As the wave propagates through the transducer its energy is added re-inforcing the signal as it propagates down the axis of the pipe. Think of it like a basket ball bouncing on its own. With each bounce the energy dissipates and the bounces become shorter, but when a player dribbles the ball it can maintain its motion indefinitely. That is because the player is adding his energy to the motion of the ball. Consider the wave within the transducer to be the player and the signal with in the pipe wall to be the ball.
Products
1010 Portable Flowmeters
Portable Multifunction Transit time Flowmeters
System 1010's Portable Meters are packaged for the rugged industrial environments common to flowmetering applications. Both 1010P and submersible 1010WP are equipped with alphanumeric display characters 1-1/8” (28.6mm) high. This allows the user to work hands-free and see meter readings from up to 40 feet (12 meters).
Model 1010WP, with protective door, is designed for heavy industrial use. This includes operation in inclement weather and in locations subject to flooding, such as pits and vaults. All accessories needed for fast installation in the field are carried in one small soft carry case.
Model 1010P is the smallest and lightest of the Portable 1010 family. Its EasyTilt ™ carry handle can be used to set the display at any convenient viewing angle. 1010P is designed primarily for use in light industrial environments. This model can temporarily replace any type of dedicated flowmeter that may be out of service for repair or recalibration.
Both models support all standard and optional 1010 functions and provide 4 hours of normal operation using the internal SmartCharge ™ battery.
1010 Dedicated Flowmeters
The 1010N permanent flowmeter provides accurate, non-intrusive mass and volumetric flowmetering. Simple to install, it provides the highest reliability without expensive pipeline cutting or interrupting operations during installation.
Multifunction capability is provided by 1010’s advanced field programmable Gate Array technology. Each channel supports Clamp-On Transit-Time, or optional Reflexor (Fast Fourier Transform Doppler) operation. 1010N flowmeters use Wide-Beam™ transducer technology to sense flow rate to assure consistent calibration. All industry standard analog and digital data output formats are provided; compliance with CE EMI/RFI specs is assured. The digital display is easily
visible from 40 feet away.The System 1010N flow meter is available in Single, Dual and Four Channel and/or Four Path versions. Choose either stainless steel chain or strap mount.