Electricity + Control June 2015

PRESSURE + LEVEL MEASUREMENT

ROUND UP

First of new generation of high-resolution digital manometer

pressure is ± 0,5 % FS. When temperature conditions are stable, the LEO 5 is capable of achieving a TEB accuracy of ± 0,01 % FS.

Keller, manufacturer of measuring technol- ogy such as isolated pressure transducers and transmitters – represented in southern Africa by Instrotech – has introduced the first of a new generation of high-resolution digital manometers.The LEO 5 features pre- cise sensor technology, fast, high-resolu- tion signal processing, peak recording and data storage with a time stamp. Designed for deployment in hostile environments, the LEO 5 features a robust stainless steel housing, safety glass front, a 16 mm backlit display and capacitive touch controls. Undetected pressure ‘spikes’ are one of the common causes of premature wear and untimely failures in pneumatic and hydraulic systems. In freshwater systems, this phenomenon is sometimes called ‘water hammer’. The LEO 5, with its pres-

sure peak analysis mode, will sample and record system pressure at a rate of 5 kHz and with 16 bit resolution, enabling the troubleshooter to positively characterize system behavior.With storage capacity for over 50 000 peak values, including tempera- ture and time stamp, data from the LEO 5 is exportable for detailed analysis via the included USB interface. Highly accurate pressure measure- ment In the standard measurement mode, the LEO 5 operates at a sampling rate of 2 kHz and with an A-to-D resolution of 20 bits. The LEO 5 line-up includes seven stand- ard full-scale pressure ranges between 3 and 1 000 bar. In the temperature range of 0…50 °C, the TEB (Total Error Band) for

Enquiries:Tel. 010 595 1831 or email sales@instrotech.co.za

Binary and analogue volumetric flow sensors for liquids

ifm electronic ’s robust SBY332 mechatronic flow sensor operates to the principle of spring supported piston. The piston, located in

For binary signal output the piston position is detected by an in- ductive sensor. Analogue sensors however detect the position by means of a magnetic-field sensor.

the valve seat in the housing, is lifted by the flowing medium against the spring resistance. With volumetric flow quantities ranging from 15 l/min, 25 l/min, 50 l/min, 100 l/min to 200 l/min, the sensor has a fast response time ≤ 10 ms. The switch points can be preset continuously for easy handling. The sensor is available with a variable R or G process connection and is suitable for pressure ranges up to 25 bar in medium temperatures up to180 °C.

The spring resistance forces the piston to return to its original position with decreasing flow.This ensures position-independent instal- lation of the flow sensor preventing backflow. The switch points can be easily set and fixed via a setting screw. The units are maintenance-free and the ro- bust mechanical design ensures use in harsh environments. Enquiries:Tel. 012 450 0370 or email email info. za@ifm.com

New thermowell design prevents vibration

For applications in processes with high flow rates, WIKA is now offering thermowells in the new ScrutonWell design. This variant is damping the excitation that leads to vibrations, which in turn can cause failures. The ScrutonWell design is applicable to all solid-machined, barstock thermowells fromWIKA. The helical form of the stem is available in two versions: manufactured in a single piece or with helices welded onto it. Installation and removal are just as easy as with a standard ther- mowell. ScrutonWell thermowells are recommended when a ther- mowell fails the strength calculation, according to ASME PTC 19.3 TW-2010, and where other optimisations (shorter or stronger stem or support collar) are not desirable. In comparison with the conven- tional stem form, the new design reduces the excitations causing vibration by more than 90 %. Enquiries:WIKA Instruments. Tel. 011 621 0000 or email sales@wika.co.za

Electricity+Control June ‘15

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