Electricity + Control June 2015

PRESSURE + LEVEL MEASUREMENT

Conclusion The experience from numerous applications offers the user a wide range of method and process-specific solutions − in the field of sani- tary applications, too − all built around a range of standard products. Last but not least, also as a result of the unique design and the large variety of materials, in spite of the strong competition by other meth- ods, float measurement technology still asserts itself in the market.

Despite more modern measuring techniques such as radar or ultrasonics, floats can still claim their place within the wide subject of liquid level detection.

exhibit good cleanability, to enable CIP (cleaning in place)/SIP (sterilisation in place) processes. It is crucial that the design of the measuring instru- ment meets the standards for food and pharma- ceutical industries. Design requirements such as adherence to certain materials, fully-welding, elimination of dead space, specific radii and sur- face finish quality are consequently prerequisites for applications in sterile process engineering. Finally, it should be noted that the hygienic de- sign sensors are certified in accordance with the 74 – 06 3 A sanitary standards (available as float switches, reed sensors and magnetostrictive sen- sors) (see Figure 3 ).

• Floats can provide information on current liquid levels in most sectors of industry. • The use of floats is particularly dependent on the physical and chemical process conditions (pressure, temperature, density and viscosity of the medium). • An advantage of float-based level measurement is that it is not influenced by moving surfaces, electrical conductivity, dielectric constants, foaming and boiling surfaces.

take note

Mathias Jung is in product management and Johanna Zieser is in marketing and product management – both at KSR Kuebler Niveau- Messtechnik AG – a division of the WIKA Group. Enquiries: Tel. 011 621 0000 or email sales@wika.co.za

Figure 3: Hygienic design sensors are certified in accordance with the 74 – 06 3 A sanitary stand- ards.

ROUND UP

Compact indicator with salt water resistance

and due to this dangerous electrostatic charging can be avoided. Thus, the device can be offered with international Ex approvals. Furthermore the metal fibres increase the robustness of the hous- ing compared to other standard plastic materials. Right approvals The RIA15 in the plastic housing does not only possess Ex approv- als like ATEX, CSA, FM and IECEx. The device can also offer the German Lloyd marine approval and shows an IP66 protection class. That’s why the indicator is very flexible in application.Furthermore the indicator is SIL interference free and so it also can be used in safety relevant uses. Complete indicator portfolio With the new plastic housing for the loop powered indicator RIA15 Endress+Hauser completes the redesign of its indicator portfolio. Endress+Hauser is able to offer a complete portfolio of state-of-the art indicators with various housing versions, international approvals and all important communication protocols. Enquiries: Benjamin Mlangeni. Tel. 011 262 8000 or email info@za.endress.com

Resistance to salt water and high humidity conditions is not only critical in the marine industry but in all industries with high tem- peratures and high humidity environments. With the new plastic housing used in the RIA15, Endress+Hauser rounds off its indicator portfolio ensuring further successes. Plastic housing material The RIA15 loop powered indicator already offered almost all the features that are required in themarine and related industries. These include the German Lloyd and Ex approvals, a very low voltage drop of ≤ 1V, small dimensions of the field housing, good readability of the display as well as an optional backlight. However, there are very high requirements on the resistance to salt water in the marine industry. With the new plastic housing of the RIA15 Endress+Hauser is now able to fulfill this requirement at a cost-effective price. Integrated metal fibres for conductivity Often plastic device housings do not offer Ex approvals, due to conductivity reasons. The RIA15 with the brand-new plastic mate- rial with integrated metal fibres shows an excellent conductivity

Electricity+Control June ‘15

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