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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

 

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