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		Control and Instrumentation Glossary Search for another term in our Glossary        Validation To confirm the initial calibration has not changed and is still valid. Validation is usually performed at regular intervals Further Reading   Velocity Collar A collar fitted to a thermowell to reduce the suspended length of the well in the pipe. Its use reduces vibrations induced by wake shedding. Further Reading   VESDA Very Early Smoke Detection and Alarm Trade name which has become synonymous for all types of aspirating smoke detection systems. Further Reading   VFD - Variable Frequency Drive An electrical system that allows a motor to be controlled to run at different speeds. Further Reading   Viscosity A measure of a fluid's resistance to flow. Further Reading Viscosity Toolbox Page   VPN - Virtual Private Network The use of encryption to provide a secure connection through an otherwise insecure network e.g. typically the Internet. The encryption may be performed by firewall software or possibly by routers. Further Reading   VSD - Variable Speed Drive An system - either electrical or mechanical - that allows a motor to be controlled to run at different speeds. Further Reading   VTT Notified Body based in Finland Further Reading		Sponsored Links
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