Control and Instrumentation Glossary
We have 11 entries in our Glossary for this letter.
Highway Addresable Remote Transducer
Open protocol that supports two way digital communications for process measurement and control devices.
A widely used nickel-molybdenum-chromium alloy.
Offers excellent resistance to wet chlorine, hypochlorite bleach, ferric chloride and nitric acid.
High Integrity Protective System - or sometimes High Integrity Protection System
An automatic safety system with a SIL level of 3 or more
SIL Ratings Guide
Human Machine Interface
A dated term superseded by SCADA
This includes welding or the use of any flame or electric arc or the use of any equipment likely to cause heat or flame or spark.
Soldering is often regarded as hot work.
Often used with reference to a utility or vent line e.g. HP air supply
Hydraulic Power Unit
Hydraulic Cleanliness Guide
HSE - Health and Safety Executive
Authority responsible for the regulation of almost all the risks to health and safety arising from work activity in Britain.
An undesirable oscillation which continues for some time after an external stimulus has disappeared.
A pressure test of piping; pressure vessels or pressure-containing parts; usually performed by pressurising the internal volume with water.
The reading of the same value differs as a function of whether the measurement is rising or falling.
Also known as deadband.
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