ALFF ENGINEERING - products - conductivity meter

<body> <b>LIQUID CONDUCTIVITY METER LCM-8716<br> </b>Quality Assessment of Dielectric Liquids<b><br> <br> </b>The <b>Liquid Conductivity Meter LCM-8716</b> is an instrument for measuring of the relative permittivity, the volume conductivity and the dissipation factor of liquid insulation. The instrument is developed according to the new <b> IEC 61620</b> standard by using the alternate square wave method. <p class="class2">This method permits an accurate determination ob above quantities at ambient temperature. The <b>Liquid Conductivity Meter LCM-8716</b> is an easy to use instrument composed of a portable measuring device and a compact low loss test cell.<p class="class2"><b>Quality Assessment of Dielectric Liquids<br> </b>According to Ohm's law, the volume conductivity <img border="0" src="images/zeichen.gif" width="10" height="8"> is a scalar quantity, which relates an applied electric field strength to a material with the generated conduction current density through it. For an homogeneous material and particularly for a liquid subjected to a low electric field, the volume conductivity is constant throughout its volume and it depends on the properties of the liquid material itself and on those of the contained ionisable substances (ionic impurities). Therefore a liquid can well be characterised by its volume conductivity.<p class="class2">The alternate square wave method (low voltage low frequency) according to IEC 61620 standard is an adequate method to determine the volume conductivity <img border="0" src="images/zeichen.gif" width="10" height="8"> and the relative permittivity <img border="0" src="images/zeichen_e.gif" width="10" height="10"> of insulating liquids at low temperature without disturbing their thermodynamic equilibrium.</p> <p class="class2">For insulating liquids used in electrical power apparatus, the conduction is the sole cause of loss at power frequencies (50/60 HZ), which are low frequencies indeed. Therefore, the dissipation factor tan<img border="0" src="images/zeichen_s.gif" width="6" height="11"> calculated from the measured <img border="0" src="images/zeichen.gif" width="10" height="8"> and <img border="0" src="images/zeichen_e.gif" width="10" height="10"> with the alternate square wave method is equal to the value of tan<img border="0" src="images/zeichen_s.gif" width="6" height="11"> measured with the classic bridge method.</p> <p class="class2">The <b>Liquid Conductivity Meter LCM-8716</b> works with the low voltage alternate square wave method and satisfies all the recommendations of IEC 61620 standard:<br> "Insulating liquids<br> - Determination of the dielectric dissipation factor by measurement of the conductance<br>   and capacitance<br> - Test method"<br> first edition, dated 1998-11.<p class="class2"> <b>FEATURES:</b> <ul> <li> <p class="class2">Accurate and fast measurements of the volume conductivity from 10<img border="0" src="images/14.gif" width="15" height="12">  to<br> 10<img border="0" src="images/8.gif" width="15" height="12">s/M and  the relative permittivity <img border="0" src="images/zeichen_e.gif" width="10" height="10">, up to 5</li> <li> <p class="class2">Determination of the dissipation factor tan<img border="0" src="images/zeichen_s.gif" width="6" height="11"> at power frequencies down to values<br> of 10<img border="0" src="images/6.gif" width="15" height="12"></li> <li> <p class="class2">Determination of the discharge time constant of electric volume charges as produced by triboelectric effects</li> <li> <p class="class2">Optional analogue outputs for continuous recording of the measured values</li> <li> <p class="class2">Portable instrument, light and self-contained</li> <li> <p class="class2">Compact test cell, easy to use, easy to clean</li> </ul> <p> <b><br> APPLICATIONS:</b> </p> <ul> <li> <p class="class2">Test and documentation of the conductivity (or resistivity) of highly insulating liquids used in electrical equipment as transformers, bushings, cables, capacitors and other high voltage apparatus</li> <li> <p class="class2">Control of the dielectric quality of liquid insulation during the manufacturing of electrical equipment</li> <li> <p class="class2">Control of the liquid insulation quality for maintenance decisions</li> <li> <p class="class2">Monitoring of the liquid insulation quality for failure alert purposes</li> <li> <p class="class2">Detection of the ionic purity of high resistance liquids: tests during the synthesis of liquids, purity checking on chemicals and mineral or organic oils, ageing and degradation studies<br>   </li> </ul> <p> <a href="http://www.alff-engineering.ch/seiten/s_downloads.htm"> <br> </a><b>ADDRESS:</b><br> <table border="0" width="100%" cellspacing="0" cellpadding="0"> <tr> <td width="50%">ALFF ENGINEERING<br ALFF> Dr. sc. techn. Jean-Jacques Alff<br> Gomweg 7<br> CH- 8915 Hausen am Albis<br> Switzerland<br>   <br> <table border="0" width="100%" cellspacing="0" cellpadding="0"> <tr> <td width="20%">phone:</td> <td width="80%">+41 1 77 66 77 6</td> </tr> <tr> <td width="20%">fax:</td> <td width="80%">+41 1 77 66 77 7</td> </tr> <tr> <td width="20%">e-mail:</td> <td width="80%">info@alff-engineering.ch</td> </tr> <tr> <td width="20%">website:<br>   </td> <td width="80%"><a href="http://www.alff-engineering.ch">www.alff-engineering.ch</a><br>   </td> </tr> </table> </td> <td width="50%" valign="top">For technical and sales information:<br> <br> Dr. V. Der Honhanession<br> phone:    +41 1 751 04 70<br> e-mail:    <a href="mailto:vahedh@swissonline.ch">vahedh@swissonline.ch</a> <p><br> </td> </tr> </table>   <p>  <p>design by <a href="http://www.cvb.ch">cvb.ch</a></p> </body>