Vega VEGACAL 65 Operating Instructions Manual

Also see for VEGACAL 65: Safety manual Operating instructions Operating instructions Operating instructions

Contents

93 Product descriptionVEGACAL 65 • Foundation Fieldbus30035-EN-130917123Fig. 3: Functional principle - Plate capacitor1 Distance between the electrode surfaces2 Size of the electrode surfaces3 Type of dielectric between the electrodesThe probe and the vessel wall are the capacitor plates. The measuredproduct is the dielectric. Due to the higher dielectric constant of theproduct compared to air, the capacitance increases as the probe isgradually covered.The capacitance as well as the resistance change are converted bythe electronics module into a level-proportional signal.Power is supplied via the H1 Fieldbus. A two-wire cable according toFieldbus specification serves as carrier of both power and digital datafor multiple sensors. This cable can be operated in two versions:• via an H1 interface card in the control system and additional powersupply• via a Linking device with HSE (High speed Ethernet) and addi-tional power supply according to IEC 61158-2The DD (Device Descriptions) and CFF (capability files) necessaryfor planning and configuration of your FF (Foundation Fieldbus) com-munication network are available in the download area of the VEGAhomepage www.vega.com under "Services - Downloads - Software- Foundation Fieldbus". The appropriate certificates are also availablethere. A CD with the appropriate files and certificates can be orderedvia e-mail under info@de.vega.com or by phone from one of theVEGA agencies under the order number "DRIVER.S".The backlight of the display and adjustment module is powered by thesensor. Prerequisite is a certain level of operating voltage.The data for power supply are specified in chapter "Technical data".The optional heating requires its own operating voltage. You can finddetails in the supplementary instructions manual "Heating for displayand adjustment module".This function is generally not available for approved instruments.3.3 OperationThe instrument can be adjusted with the following adjustment media:Power supply and buscommunicationDD/CFF