Electricitiy + Control February 2015

SENSORS, SWITCHES + TRANSDUCERS

ROUND UP

Sensors for fluid engineering

UniTemp temperature sensors The measure the temperature of liquid and gaseous media and make it possible to monitor temperature within processes. They can be used under greatly varying ambient conditions as the switching points can be individually adjusted within a measuring range of 0 to 200 ºC. Wenglor is exclusively represented by Randburg-based company, ASSTech . Enquiries: Anastas Schnippenkotter.Tel. 011 708 9200 or email info@asstech.co.za

Wenglor, has introduced a new state-of-the-art sensor measuring product range dedicated to fluid engineering. Based on a patented process which is unique in the field of flow sensor technology allows theWenglorFluid devices to be mounted regardless of position and flow direction and still provide precision measurements. UniFlow sensors These ascertain the flow velocities of oily and aqueous media in closed piping systems. They do not have to be aligned to the direction of flow during installation as heating and the temperature sensor are located in the tip of the device. UniBar pressure sensors The sensor measures the relative pressure of any desired media in closed systems within a range of -1 to +600 bar. Wenglor pressure sensors with metallic membrane are highly suited for areas with strict hygiene requirements such as in food and pharmaceuticals. They are flush- mounted and therefore compatible with pipe cleaning devices.

Safety light curtains – linked versions

Leuze MLC 500 safety light curtains are now also available as linked versions, says Gerry Bryant, managing director, Countapulse Controls . “In those instances where multiple-sided access guarding is required or point-of-operation guard- ing is to be combined with area protection as stepping-behind protection, the use of cascaded MLC devices reduces the cost of installation and cabling considerably.” Rigid L and U-shaped connections as well as variants with flexible cable connections can be used. The host-guest variants are Type 4 devices that provide reliable protection without dead space and with maxi- mum system availability. A particular feature is that they are unusually slim (29 mm x 35 mm) and extremely sturdy due to the slightly set back front screens, reinforced side walls and metal end caps. Installation of the MLC safety light curtains is very easy due to the large variety of possible mounting brackets. The Leuze MLC 500 series includes the newest generation of extremely

sturdyType 4 safety light curtains.Three function classes – Basic, Standard and Extended – enable the most efficient use of devices from simple standard applications to complex controlled special safeguarding processes.The devices can be used universally, due to metal end caps, a flexible fastening concept and the option of form- locking installation.There are also variants which have an AIDA-compliant pin assignment. AIDA is an acronym for Automatisierungs-Initiative deutscher Automobilisten, or the Automation Initiative of German Automobile Manufacturers. The basic version of the Type 4 safety light cur- tains provides the most important functions such as range reduction on the transmitter, reversible transmission channels, a LED display and auto- matic start/restart interlock. Features include the prevention of mutual interference of the sensors by selectable transmission channels and range reduction, if applicable. Enquiries: Gerry Bryant.Tel. 011 615 7556 or email bryant@countapulse.co.za

Ac current transducer with large window NKTechnologies of San Jose, California, has released a new series of large split-core ac current transducers. The large window measures 86 x 58 mm and is available in four current ranges from 800A to 1 600A with the industry standard 4 – 20 mA looped powered output. Available from Denver Technical Products , the ATR series incorporates a TRMS processor and will accurately read distorted wave forms.TheAT series is a lower cost average responding unit. Enquiries:Tel. 011 626 2023 or email denvertech@pixie.co.za

Electricity+Control February ‘15

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