1. Connect gauge to a calibrated pressure source. 2. Check zero at atmospheric pressure. 3. Apply pressure in steps (0%, 25%, 50%, 75%, 100%). Record readings. 4. Reduce pressure in steps back to zero. Record again. 5. Compare gauge vs. standard; note errors. 6. Adjust zero/span if out of tolerance. 7. Repeat test until within limits. 8. Document results and label the gauge. #pressuregauge #instrumentation #InstrumentationEngineering | Instrumentation World

44K views · 219 reactions | Is your boiler pressure gauge reading low? Roger explains how to read it and what the numbers mean. Learn about the green zone, pressure relief valves, and how to safely add water to your system using the filling loop. Always check this first if your boiler stops! #BoilerPressure #HomeMaintenance #DIYRepairs #HeatingSystem #PlumbingTips #CombiBoiler | Skill Builder | Facebook