Use case: f(x) calculations # Engineering calculations on plant tags, without code f(x) in Aditum Data builds engineering calculations on any tag or chart. Click blocks together or type a formula: both views always show the same formula, and every step is checked with unit algebra. Facts checked 24 October 2026 ## Which calculations are ready to use? Nine templates fill themselves from the selected equipment's instruments and datasheets. Temperature difference, approach, LMTD, heat-transfer coefficient U, duty, efficiency, specific energy per tonne, OEE and mass balance. ## What else is in the library? Water and steam properties, statistics, rolling functions, rates, integrals, FFT, balances, fouling, control-loop health, SPC rules, soft sensors and time-to-limit forecasts. - Water and steam properties follow IAPWS-IF97. - SPC charts use the Western Electric and Nelson rules, with Cp and Cpk. - Calculations can carry an accuracy, for example "63.6 ± 1.0 °C (95 %)", and name the input that contributes most. ## How are units handled? Every step is checked with unit algebra; mixing units that don't fit is refused with a suggested fix. Absolute temperatures and temperature differences are told apart, so a °C difference is never added to a °C reading by mistake. ## Can a calculation become a tag? Yes. A calculation can be saved as a tag that is written to the Aditum database every 5 to 1,440 minutes and appears as a dataset. Limits on values are judged by the server and shown with the same badge everywhere. A datasheet or AI-suggested limit shows as "not confirmed" until an editor approves it. ## Questions **Does AI calculate the numbers?** No. The engine calculates every number. The AI may propose a formula; the same engine checks it, and a person approves it. **Are averages correct for deadbanded tags?** Yes. Averages are time-weighted, so deadbanded or report-by-exception tags give correct numbers. ## Read next - [Energy and emissionsCalculate specific energy per tonne, energy per batch and steam properties from historian tags without code, the same way at every site.](https://aditumdata.com/use-cases/energy-emissions) - [Multi-site KPIsDefine a KPI once, map each site's own tags to it, and get the same number calculated the same way at every site, with every figure traced to its source tags.](https://aditumdata.com/use-cases/multi-site-kpis) - [Aditum Data vs AVEVA PI SystemAVEVA PI System is the established plant historian; Aditum Data reads PI and turns it into comparable multi-site KPIs, data health alerts and dashboards. Sourced comparison.](https://aditumdata.com/compare/aveva-pi) ## Discuss architecture with an industrial data specialist. Source compatibility, security boundaries, deployment and multi-site operation. Or request a 45-minute technical session to select one KPI and three sites and draft the acceptance criteria. [Book a technical demo](https://aditumdata.com/#contact)[sales@aditumdata.com](mailto:sales@aditumdata.com)