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Control and Instrumentation GlossaryWe have 11 entries in our Glossary for this letter. HART Highway Addresable Remote Transducer Open protocol that supports two way digital communications for process measurement and control devices. Further Reading Hastelloy A widely used nickel-molybdenum-chromium alloy. Offers excellent resistance to wet chlorine, hypochlorite bleach, ferric chloride and nitric acid. Further Reading HIPS High Integrity Protective System - or sometimes High Integrity Protection System An automatic safety system with a SIL level of 3 or more Further Reading SIL Ratings Guide HMI Human Machine Interface A dated term superseded by SCADA Further Reading Hot Work This includes welding or the use of any flame or electric arc or the use of any equipment likely to cause heat or flame or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. Further Reading HP High Pressure Often used with reference to a utility or vent line e.g. HP air supply Further Reading HPU Hydraulic Power Unit Further Reading 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. Further Reading Hunting An undesirable oscillation which continues for some time after an external stimulus has disappeared. Further Reading Hydrotest A pressure test of piping; pressure vessels or pressure-containing parts; usually performed by pressurising the internal volume with water. Further Reading Hysteresis The reading of the same value differs as a function of whether the measurement is rising or falling. Also known as deadband. Further Reading |
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