July 2012
We take so much for granted in our lives and we need to remind ourselves that nothing just happens. Behind the scenes people are devising and operating amazing systems that make the wheels turn and the world go around. This occurs to me... and never fails to astound me during the compilation of every magazine. I do believe that we notice how technologically privileged we are only when there's a breakdown: No water for a day, the lights go out or the system is down. There is so much more to it than that!
Every article we publish covers a form of technology, that facilitates some vital part of our daily lives, the intricacies of which many people out there are blissfully unaware.
Wendy Izgorsek
Editor
Tel. 011 622 4770
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Compatibility in device integration By J Garcia, VEGA To guarantee the investment security of 'Field Device Tool' technology demanded by users, the associated device drivers must be compatible - both upward and downward. About VFDs By H du Preez, H du Preez and Associates There are three common types of Variable Frequence Drive (VFD) - current source, voltage source and pulse-width modulation. Pulse width VFDs are the most commonly used in industry. Light that comforts and calms By N Megnath and W Setlhodi, Philips South Africa Using, as an example, the MRI scanning unit at the ‘Life Little Company of Mary Hospital' in Groenkloof, Pretoria, South Africa, the authors explain the significance of lighting in patient experience and recovery. ‘Accuracy means money': Flow meters and calibration By F van den Berg, Endress+Hauser When determining accuracy, calibration is just a link in a chain of quality control measures governed by internationally recognised standards. Equally important is measurement uncertainty, traceability, accreditation and verification. Fundamentals of gas flow calibration By W Thomson, Fluke This article discusses the relationship between volumetric flow and mass flow. It also offers guidelines for making effective measurements around choice of standards, leak detection, and maintaining steady-steady state flow. (See ‘Ideal Gas Laws' on E+C Spot On (www.eandcspoton.co.za). Selection of control valves on water optimisation projects By W Booysen, JF van Rensburg, EH Mathews, North-West University (CRCED Pretoria) and consultants to HVAC International and TEMM International Valve selection and specification requires several constraints to be satisfied in order to ensure an effective solution. This article addresses the process of analysing system parameters to determine characteristics and evaluates possible solutions to select a suitable valve solution based on the constraints. It is based on a water system optimisation project on a mine close to Westonaria (Johannesburg, South Africa). Sugar industry diversifying into fuel and power By R Orendo Smith, Frost & Sullivan There are many underlying reasons why the sugar industry in Sub-Saharan Africa is diversifying into fuel and power... this article highlights some related projects which are currently in progress in Africa.
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