Industrial AI & efficiency glossary
Plain-English definitions of the 175 terms behind industrial AI, predictive maintenance, energy management and decarbonization.
5S5S is a workplace-organisation method — Sort, Set in order, Shine, Standardise, Sustain — that creates a clean, ordered,…A3 Problem SolvingA3 problem solving is a structured method that documents a problem, its analysis, and the proposed countermeasures on a …Absorption ChillerAn absorption chiller produces cooling using heat as its main energy input instead of an electrically driven compressor.…Acoustic Emission MonitoringAcoustic emission monitoring detects the high-frequency stress waves released when materials crack, leak or deform under…ActuatorAn actuator is a device that converts a control signal into physical motion or force to manipulate a process. Common exa…Adiabatic Flame TemperatureAdiabatic flame temperature is the theoretical maximum temperature a flame would reach if all the heat of combustion sta…Advanced Process Control (APC)Advanced process control uses model-based techniques — most commonly model predictive control (MPC) — to run a process c…AI Vision Inspection (Machine Vision QC)AI vision inspection uses cameras and deep-learning models to automatically detect defects, verify assembly and read cod…AndonAndon is a visual (and often audible) signal system that lets any worker flag a problem instantly — a light, board or al…Anomaly DetectionAnomaly detection uses statistics or machine learning to flag when equipment or process behaviour deviates from its norm…Approach TemperatureApproach temperature is the smallest temperature difference between the two fluid streams in a heat exchanger, typically…Asset CriticalityAsset criticality ranks equipment by the consequence and likelihood of its failure — how badly a failure hits safety, pr…Asset Performance Management (APM)Asset performance management is software and practices that maximise the reliability, availability and efficiency of phy…Backlog ManagementBacklog management is the disciplined control of the queue of identified-but-not-yet-completed maintenance work, usually…Bathtub CurveThe bathtub curve describes how an asset's failure rate changes over its life: high early failures from manufacturing or…Boiler BlowdownBlowdown is the controlled removal of water from a boiler to limit the build-up of dissolved solids. Each litre leaves a…Boiler EfficiencyBoiler efficiency is the ratio of useful heat delivered to the energy in the fuel burned. Losses come mainly from flue g…BottleneckA bottleneck is the resource in a process whose limited capacity constrains the throughput of the whole system. Output c…Carbon FootprintA carbon footprint is the total greenhouse-gas emissions associated with an organisation, product or activity, expressed…Carbon IntensityCarbon intensity is the amount of CO₂ emitted per unit of output — for example tonnes of CO₂ per tonne of product or per…CavitationCavitation is the formation and violent collapse of vapour bubbles in a liquid when local pressure drops below its vapou…CBAM (Carbon Border Adjustment Mechanism)CBAM is an EU measure that puts a carbon cost on certain imported goods — such as steel, cement, aluminium and fertilise…CHP / CogenerationCombined heat and power (CHP), or cogeneration, generates electricity and useful heat from a single fuel input, capturin…CMMSA CMMS (Computerised Maintenance Management System) is software that manages maintenance work — work orders, preventive …Compressed Air SystemCompressed air is a widely used but energy-expensive industrial utility — often called the fourth utility. Most of the e…Condition MonitoringCondition monitoring is the continuous or periodic measurement of an asset's health indicators — vibration, temperature,…Condition-Based Maintenance (CBM)Condition-based maintenance triggers maintenance from the measured condition of an asset rather than a fixed calendar. W…Connected WorkerA connected worker is a frontline industrial employee equipped with digital tools — mobile devices, wearables, sensors a…Control LoopA control loop is the complete chain of components that measures a process variable, compares it to a setpoint, and adju…Cycles of ConcentrationCycles of concentration is the ratio of dissolved solids in a cooling tower's recirculating water to that in the makeup …DCS (Distributed Control System)A DCS is a control system that distributes controllers across a large continuous process — refineries, power and chemica…DeaeratorA deaerator removes dissolved oxygen and carbon dioxide from boiler feedwater by heating it close to saturation and stri…Demand ResponseDemand response is adjusting electricity consumption in response to grid signals or prices — shifting or curtailing load…Dew PointDew point is the temperature at which air or flue gas becomes saturated and moisture begins to condense. Operating surfa…Digital ThreadThe digital thread is the connected flow of data about a product or asset across its whole lifecycle — design, manufactu…Digital TwinA digital twin is a living digital model of a physical asset or process, kept in sync with the real thing through live d…Distributed I/ODistributed I/O refers to input and output modules placed close to field devices rather than centralised in a main contr…EAM (Enterprise Asset Management)EAM (Enterprise Asset Management) is the broader discipline and software for managing an asset's entire lifecycle — from…EconomiserAn economiser is a heat exchanger that recovers heat from boiler flue gas to preheat the feedwater. It is one of the mos…Edge AIEdge AI runs machine-learning models directly on or near the equipment — on a sensor, gateway or controller — instead of…Edge Computing (Industrial)Industrial edge computing processes data locally at or near the machine, rather than sending everything to the cloud. It…Emissivity (ε)Emissivity is how effectively a surface radiates heat, from 0 to 1 relative to a perfect black body. Polished bare metal…Energy AuditAn energy audit is a structured review of how a site uses energy, identifying where it is consumed and wasted and quanti…Energy Management System (EnMS / EMS)An energy management system is the combination of metering, software and processes used to monitor, control and continuo…EtherNet/IPEtherNet/IP is an industrial Ethernet protocol that applies the Common Industrial Protocol (CIP) over standard Ethernet …EU ETSThe EU Emissions Trading System is a cap-and-trade scheme that puts a price on carbon for large emitters. The cap on tot…Excess AirExcess air is the combustion air supplied beyond the exact amount needed to burn the fuel completely. A little excess en…Explainable AI (XAI)Explainable AI refers to methods that make the predictions of machine-learning models understandable to humans, showing …Failure Mode and Effects Analysis (FMEA)Failure mode and effects analysis is a structured method for identifying how a component or process can fail, the effect…Feature EngineeringFeature engineering is the process of transforming raw sensor and process data into informative inputs — features — that…Feedforward ControlFeedforward control is a strategy that measures a disturbance before it affects the process and proactively adjusts the …FieldbusFieldbus is a family of industrial digital communication protocols that connect field devices such as sensors, actuators…Flue Gas LossFlue gas loss is the energy carried out of the stack by hot combustion gases. It is usually the single largest loss in a…FMEA (Failure Mode and Effects Analysis)FMEA is a structured method for identifying how a component or process can fail, the effects of each failure, and how se…Fouling FactorA fouling factor is an added thermal resistance applied in heat-exchanger design to account for deposits — scale, sludge…Foundation ModelA foundation model is a large machine-learning model trained on broad data that can be adapted to many downstream tasks …GembaGemba means 'the real place' — where work actually happens, such as the shop floor. The lean practice of the gemba walk …Generative AIGenerative AI is artificial intelligence that creates new content — text, images, code or designs — rather than only cla…Green HydrogenGreen hydrogen is hydrogen produced by splitting water through electrolysis using renewable electricity, so its producti…Heat ExchangerA heat exchanger transfers heat between two fluids without mixing them — for example recovering heat from hot flue gas o…Heat LossHeat loss is the unwanted transfer of thermal energy from hot equipment — pipes, valves, vessels, boilers — to the surro…Heat RateHeat rate is the amount of fuel energy a power plant or engine consumes to generate one unit of useful output, usually e…Heat Recovery Steam Generator (HRSG)A Heat Recovery Steam Generator is a heat exchanger that captures hot exhaust gas — typically from a gas turbine — and u…HeijunkaHeijunka is the lean practice of levelling production by volume and product mix over a period, rather than building in l…HMI (Human-Machine Interface)An HMI is the graphical interface through which operators monitor and interact with industrial machinery and processes. …Hoshin KanriHoshin kanri is a lean strategic planning method that aligns a few breakthrough objectives from the top of an organisati…Industrial DecarbonizationIndustrial decarbonization is the process of cutting carbon emissions from manufacturing and heavy industry — through en…Industrial Heat PumpAn industrial heat pump uses electricity to move heat from a lower temperature to a higher, useful one — upgrading waste…Industrial IoT (IIoT)The Industrial Internet of Things (IIoT) is the network of connected sensors, machines and systems in industrial setting…Industry 4.0Industry 4.0 is the fourth industrial revolution: connecting machines, sensors, data and analytics across the factory so…Inference (Machine Learning)Inference is the stage at which a trained machine-learning model is used to make predictions on new, live data, as oppos…ISO 50001ISO 50001 is the international standard for energy management systems. It gives organisations a framework to establish, …JidokaJidoka — 'autonomation', or automation with a human touch — gives machines and operators the ability to detect an abnorm…KaizenKaizen means continuous improvement through small, incremental changes made by the people who do the work. Rather than r…KanbanKanban is a visual signalling system that triggers production or replenishment only when downstream demand pulls it, lim…Large Language Model (LLM)A large language model is an AI system trained on vast amounts of text to understand and generate human language. It pow…Latent HeatLatent heat is the energy absorbed or released when a substance changes phase — such as water boiling to steam — at cons…Lean ManufacturingLean manufacturing is a methodology focused on maximising customer value while eliminating waste — overproduction, waiti…Life Cycle Assessment (LCA)Life Cycle Assessment is a standardised method for quantifying the environmental impacts of a product, process or servic…Load CellA load cell is a force transducer that converts an applied mechanical load into a measurable electrical signal, typicall…Lockout/Tagout (LOTO)Lockout/tagout is a safety procedure that isolates and locks energy sources — electrical, steam, hydraulic, pneumatic — …Log Mean Temperature Difference (LMTD)The log mean temperature difference is the effective average temperature gap driving heat transfer between two fluids al…Machine Learning (Industrial)In industry, machine learning trains algorithms on historical sensor and process data to predict failures, detect anomal…Machine VisionMachine vision is the use of cameras, lighting, and image-processing software to let machines inspect, measure, guide, a…Mean Time Between Failures (MTBF)Mean time between failures is the average operating time between consecutive failures of a repairable asset, calculated …Mean Time To Repair (MTTR)Mean time to repair is the average time taken to restore a failed asset to working order, from the moment of failure to …MES (Manufacturing Execution System)A Manufacturing Execution System (MES) manages and tracks production on the shop floor in real time — work orders, mater…MLOpsMLOps is the practice of reliably deploying, monitoring and maintaining machine-learning models in production — the disc…ModbusModbus is a simple, open industrial communication protocol that lets controllers and field devices exchange data using a…Model DriftModel drift is the gradual decline in a deployed machine-learning model's accuracy as the real-world data it sees diverg…Motor Current Signature Analysis (MCSA)Motor Current Signature Analysis detects faults in electric motors by analysing the frequency content of the supply curr…MQTTMQTT is a lightweight publish-subscribe messaging protocol designed for constrained devices and unreliable networks. Dev…MTBF (Mean Time Between Failures)MTBF is the average operating time between failures of a repairable asset. A higher MTBF means a more reliable machine. …MTTR (Mean Time To Repair)MTTR is the average time taken to repair a failed asset and return it to service, including diagnosis, repair and testin…MudaMuda is the Japanese lean term for waste — any activity that consumes resources without adding value for the customer. C…MuraMura is the lean term for unevenness or variability in workload, flow or demand. Fluctuating volumes force systems to si…MuriMuri is the lean term for overburden — pushing people, equipment or processes beyond their reasonable capacity. It cause…NDT (Non-Destructive Testing)Non-destructive testing inspects materials and equipment for defects without damaging them — using ultrasound, radiograp…Net Positive Suction Head (NPSH)Net positive suction head is the margin of pressure available at a pump's suction above the liquid's vapour pressure, en…Net ZeroNet zero means cutting greenhouse-gas emissions as close to zero as possible and balancing any hard-to-eliminate residua…Neural NetworkA neural network is a machine-learning model loosely inspired by the brain, made of layered interconnected nodes that le…OEE (Overall Equipment Effectiveness)OEE is a standard metric for how effectively equipment is used, combining Availability × Performance × Quality into a si…OPC (Classic)OPC Classic is a set of legacy Windows-based standards for exchanging industrial process data between control systems an…OPC UAOPC UA (Open Platform Communications Unified Architecture) is an open, secure, platform-independent standard for industr…Organic Rankine Cycle (ORC)The Organic Rankine Cycle is a thermodynamic power cycle that uses an organic working fluid with a low boiling point ins…P-F CurveThe P-F curve describes how a failure develops from the point a potential failure becomes detectable (P) to the point of…Peak ShavingPeak shaving is the practice of reducing a facility's electricity demand during periods of highest consumption to lower …PID ControlPID control is a feedback control technique that continuously adjusts a process output based on the proportional, integr…Pinch AnalysisPinch analysis is a systematic method for minimising energy use in a process by matching hot and cold streams for heat r…Planned Maintenance Percentage (PMP)Planned maintenance percentage is the share of maintenance labour hours spent on planned, scheduled work versus reactive…PLC (Programmable Logic Controller)A PLC is a ruggedised industrial computer that controls machinery and processes in real time, executing logic on inputs …Poka-Yoke (Mistake-Proofing)Poka-yoke is designing a process or device so that errors are impossible or immediately obvious — a connector that only …Power FactorPower factor is the ratio of real power (doing useful work) to apparent power drawn from the grid. A low power factor me…Predictive Maintenance (PdM)Predictive maintenance uses sensor data and analytics to predict when equipment will fail, so maintenance happens just b…Predictive QualityPredictive quality uses process and sensor data to forecast the quality of output before or as it is produced, so operat…Prescriptive Maintenance (RxM)Prescriptive maintenance goes a step beyond predictive: as well as forecasting a failure, it recommends what to do about…Pressure TransmitterA pressure transmitter is a field instrument that senses process pressure and converts it into a standardised output sig…Preventive MaintenancePreventive maintenance services equipment on a fixed schedule — by time or usage — regardless of its actual condition, t…Process HistorianA process historian is a database optimised for storing large volumes of time-series data from industrial sensors and co…PROFINETPROFINET is an industrial Ethernet standard for real-time communication between controllers and field devices. Built on …Prognostics and Health Management (PHM)Prognostics and Health Management is an engineering discipline that combines condition monitoring, diagnostics and failu…Programmable Automation Controller (PAC)A programmable automation controller is an industrial controller that combines the rugged, deterministic control of a PL…Prompt EngineeringPrompt engineering is the practice of writing inputs that get reliable, useful results from AI assistants and large lang…Proximity SensorA proximity sensor detects the presence or absence of a nearby object without physical contact. Common types include ind…PsychrometricsPsychrometrics is the study of the thermodynamic properties of moist air — temperature, humidity, enthalpy and dew point…RCM (Reliability-Centred Maintenance)Reliability-centred maintenance is a structured method for deciding the most effective maintenance strategy for each ass…RecuperatorA recuperator is a heat exchanger that continuously transfers heat from a furnace's hot exhaust gas to the incoming comb…Regenerative BurnerA regenerative burner captures heat from a furnace's exhaust gases in a ceramic media bed, then uses that stored heat to…Reinforcement LearningReinforcement learning is a class of machine learning in which an agent learns to make sequences of decisions by trial a…Remaining Useful Life (RUL)Remaining useful life is the estimated time an asset can keep operating before it fails or needs intervention. Predictiv…Remote Terminal Unit (RTU)A remote terminal unit is a microprocessor-based device that monitors field instruments and equipment at remote sites an…Retrieval-Augmented Generation (RAG)RAG is a technique that lets a large language model answer from your own documents: it retrieves the relevant passages f…Root Cause Analysis (RCA)Root cause analysis is a structured method for finding the underlying cause of a failure or problem, rather than treatin…RTD (Resistance Temperature Detector)An RTD is a temperature sensor that measures temperature from the change in electrical resistance of a metal element, us…Safety PLCA safety PLC is a programmable controller designed to perform safety-related functions with built-in redundancy, self-di…SCADASCADA (Supervisory Control and Data Acquisition) is the system that monitors and controls industrial processes in real t…Sensible HeatSensible heat is the energy that changes a substance's temperature without changing its phase, and which can be 'sensed'…Servo DriveA servo drive is an electronic amplifier that controls a servo motor by precisely regulating its position, velocity, and…SetpointA setpoint is the desired target value for a controlled process variable, such as a target temperature, pressure, flow r…Six SigmaSix Sigma is a data-driven methodology for reducing process variation and defects, using statistical tools and the DMAIC…SMED (Single-Minute Exchange of Die)SMED is a lean method for slashing changeover time — ideally to single-digit minutes — by separating setup tasks that ca…Soft SensorA soft sensor (virtual sensor) estimates a quantity that is hard or expensive to measure directly — like product quality…Spare Parts OptimisationSpare parts optimisation is the practice of setting stock levels for maintenance spares to balance the cost of holding i…SPC (Statistical Process Control)Statistical process control uses control charts and statistics to monitor a process and detect when it drifts out of its…Specific Energy Consumption (SEC)Specific energy consumption is the energy used per unit of output — kWh per tonne, per litre, per part. It normalises en…Stack EffectThe stack effect is the natural draught created when warm, less dense air or gas rises through a vertical flue or buildi…Standard WorkStandard work is the documented, agreed best-known method for performing a task, specifying the sequence, timing and req…Steam TrapA steam trap is an automatic valve that drains condensate and non-condensable gases from a steam system while holding ba…Stoichiometric CombustionStoichiometric combustion is the burning of fuel with the exact amount of oxygen needed for complete reaction, leaving n…SuperheatSuperheat is heat added to steam above its saturation (boiling) temperature at a given pressure, producing dry steam tha…Supervised LearningSupervised learning is a class of machine learning that learns to map inputs to outputs from labelled training examples.…Surface TemperatureSurface temperature is the temperature of the outer face of equipment or insulation. It drives both heat loss to the env…Takt TimeTakt time is the rate at which a product must be completed to meet customer demand — total available production time div…Theory of Constraints (TOC)The theory of constraints holds that any system's output is limited by a single bottleneck, so the fastest way to improv…Thermal Conductivity (λ)Thermal conductivity (lambda, λ) measures how readily a material conducts heat, in W/m·K. Lower λ means a better insulat…Thermal InsulationThermal insulation is material applied to hot or cold equipment to slow heat transfer. On industrial hot surfaces it red…ThermocoupleA thermocouple is a temperature sensor made of two dissimilar metal wires joined at one end, which generates a small vol…Thermography (Infrared Inspection)Thermography uses infrared cameras to map surface temperatures, revealing electrical hot spots, failing bearings, steam-…Time-Series DatabaseA time-series database is a database optimised for storing and querying data points indexed by time, such as streams of …Time-Series ForecastingTime-series forecasting uses historical sequential data — sensor readings, energy use, demand — to predict future values…Total Cost of Ownership (TCO)Total cost of ownership is the full lifetime cost of an asset — purchase plus energy, maintenance, downtime, spares and …TPM (Total Productive Maintenance)Total Productive Maintenance is a methodology that involves operators in caring for their own equipment — cleaning, insp…Training DataTraining data is the historical, often labelled, dataset used to teach a machine-learning model the patterns it will lat…TransducerA transducer is a device that converts one form of energy or physical quantity into another, most commonly converting a …Turndown RatioTurndown ratio is the ratio of a burner's, boiler's or valve's maximum rated output to its minimum stable output. A high…U-value (Thermal Transmittance)The U-value is the rate of heat transfer through a structure per unit area and temperature difference, in W/m²·K. A lowe…Unplanned DowntimeUnplanned downtime is time a process or line is stopped unexpectedly due to equipment failure or faults. It is one of th…Unsupervised LearningUnsupervised learning is a class of machine learning that finds structure in unlabelled data — clusters, patterns or out…Value Stream Mapping (VSM)Value stream mapping is a lean technique that draws the full flow of material and information needed to deliver a produc…VFD (Variable Frequency Drive)A VFD controls the speed of an electric motor by varying the frequency of its power supply. By matching motor speed to a…Vibration AnalysisVibration analysis measures the vibration signature of rotating equipment to detect faults such as imbalance, misalignme…Waste Heat RecoveryWaste heat recovery captures heat that would otherwise be rejected — from flue gas, exhaust, hot products or cooling str…Water HammerWater hammer is a pressure surge caused when a moving column of liquid is suddenly stopped or redirected, such as by a r…Weibull AnalysisWeibull analysis fits failure-time data to a Weibull distribution to reveal whether failures are dominated by early defe…Wrench TimeWrench time is the portion of a maintenance technician's shift spent actually working on equipment, as opposed to travel…