WCA September 2008

news

Latest tester can be spring loaded

Guide to temperature measurement Cropico has published an illustrated guide on temperature measurement, explaining some of the common causes of error and how to avoid them. The A5, full-colour ‘Guide to Temperature Measurement’ explains what temperature is and the definition of heat. There’s a practical and easy-to-follow explanation of the three common temperature scales: Fahrenheit, Celsius and Kelvin. Section titles include ‘The International Practical Temperature Scale,’ ‘Temperature Measurement,’ ‘Thermocouples’ (including explanations of the various types of thermocouples and choosing a thermocouple) and ‘Thermistors’. The guide features a series of resistance and thermocouple tables for user ease of reference, while a convenient glossary of terms provides an explanation of terms relating to temperature measurement; these include ANSI (American National Standards Institute), IPRT (Industrial Platinum Resistance Thermometer) and SPRT (Standard Platinum Resistance Thermometer). Copies of the guide are available from Cropico customer services or via the Cropico website.

Precision springs are used in electro-mechanical assemblies for the automotive, defence and aerospace industries, as well as in sports and leisure activities. Depending on the application, random samples are tested after manufacture or in some cases 100% testing is necessary. At wire 2008 Zwick exhibited a compression-spring tester for highly accurate measurement of precision springs from 1 to 2,500 N. It has extremely good overall measurement technology characteristics, surpassing even the requirements of Standard EN 7500. The compression-spring tester is used with the zwicki single-column materials-testing machine in conjunction with testControl electronics. The device possesses extreme vertical and lateral stiffness and comes already equipped with a precision load-cell. Overload protection prevents damage to the load cell in the event of block force being reached.

Cropico – UK

Fax : +44 191 586 0227 Website : www.cropico.com

Email : sales@cropico.com

Zwick spring-testing machine m m

Precision guides allow only vertical movement of the compression platens. The extremely stiff and patented load cell is insensitive to transverse forces and ensures that measuring errors due to elasticity under load or eccentric forces are reduced to a minimum. The instrument is designed for indirect spring length measurement, and this offers a very high level of accuracy as the already minimal axial deformation can be electronically compensated in real time. Direct measurement is an option and is recommended for high-precision testing of very small springs. Zwick GmbH & Co KG – Germany Fax : +49 07305 10200 Email : info@zwickroell.eu Website : www.zwick.de

46

Wire & Cable ASIA – September/October 2008