Control and Instrumentation Glossary
We have 8 entries in our Glossary for this letter.
To confirm the initial calibration has not changed and is still valid.
Validation is usually performed at regular intervals
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.
Very Early Smoke Detection and Alarm
Trade name which has become synonymous for all types of aspirating smoke detection systems.
VFD - Variable Frequency Drive
An electrical system that allows a motor to be controlled to run at different speeds.
A measure of a fluid's resistance to flow.
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.
VSD - Variable Speed Drive
An system - either electrical or mechanical - that allows a motor to be controlled to run at different speeds.
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