Endress and Hauser

When a bluff body is interspersed in a fluid stream, the flow is split into two parts. The boundary layer (see Chapter 11) which forms over the surface of the obstruction develops instabilities and vortices are formed and then shed successively from alternate sides of the body, giving rise to what is known as a von Karman vortex street. This process sets up regular pressure variations downstream from the obstruction whose frequency is proportional to the fluid velocity, as shown by Strouai. 9. Vortex flowmeters are very versatile and can be used with almost any fluid — gases, liquids and multi-phase fluids. The operation of the vortex meter, illustrated in Figure 6.27, is described in more detail in Volume 3, by Gjnesi(8) and in a publication by a commercial manufacturer, Endress and Hauser.10 ... 

Endress and Hauser pic Technical Product Group Report PG001D/05/e (1993), 20. Flow measurement. 

Endress and Hauser pic Technical Information TI 03lD/06/e 1997). Vortex flow measuring sy.stem, prowirl 70. 

Conductivity sensor Endress and Hauser High-temperature sensor, completely encapsulated for optimum hygiene... 

A more reliable technique, and one that can be used where there are larger surface fluctuations, is to use an ultrasonic radar probe (Machon et al., 1991). Such probes are commercially available, from, for example, Endress and Hauser. The probe is mounted above a representative part of the fluctuating surface and measures the distance to the surface. Care must be taken in the calibration (especially if any foam is present) to ensure that the true surface is detected and that an adequate range of fill levels is covered. Some foams will not be penetrated by the ultrasonic beam. Calibration with a moving liquid surface is recommended. 

The products offered by this firm are similar to the Auburn devices for conductance measurements but have shown some difficulty in handling fine powders with electrode coatings. In the level device arena Endress and Hauser is quite advanced using a variety of principles to develop a signal. Some individuals, however, believe that no level device is foolproof in making a process decision. 

Turbidity All On-site, on-line, in-situ No Nephelometry, photometry (UV, IR, multi-wavelength) Electrodes (specific, glass, polymer, LIS and reference) Few seconds 1-10% 0-4000 NTU ISO 7027 DIN 38404 USEPA 180.1 ABB Instrumentation, Anael, Aquacontrol, Aqualyse, Aquams, AWA Instruments, Bamo mesures, Datalink, EFS Lac Instruments et systemes, Endress Hauser, Equipements scientifiques SA, Hydrolab, Martec, Mettler Toledo, OTT, Hach, Seres, Cole Parmer, WTW, YSI Hydrodata... 

Vibratrol, Level switch, Endress + Hauser Vibrox, Packers, Gump Div., Buffalo Technologies Vicast, Polyester resins for cultured marble and solid surface, AOC... 

In September 2011, FDI Cooperation, LLC, was formed with representations from the Fieldhus foundation, FDT Group, HART Communications Foundation, OPC Foundation, and PROFIBUS PROFINET International. Also, major process automation suppliers like ABB, Emerson Process Management, Endress + Hauser, Honeywell, Invensys, Siemens, and Yokogawa lent their support. 

---