Instrumentation

(Based on IEC 61508 & IEC 61511) Overview Safety Integrity Level (SIL) certification is a critical process for ensuring functional safety in industrial automation systems, particularly Safety Instrumented Systems (SIS). To achieve compliance and minimize risk, the certification process must adhere to international standards (IEC 61508 for E/E/PE systems and IEC 61511 for process industry […]

1. General Requirements The installation and use of pressure gauges, safety valves, level gauges, and thermometers shall comply with the Regulations on Safety Technical Supervision of Pressure Vessels. The calibration and maintenance of pressure gauges shall comply with relevant national metrology regulations. Pressure gauges must be calibrated prior to installation, with the maximum working pressure

1. Define Control Objectives Before touching parameters, agree on measurable targets for the loop: setpoint tracking speed, allowable overshoot, steady‑state error, disturbance rejection, and noise sensitivity. Capture hard constraints (actuator limits, safety margins) and the plant’s operating range. 2. Choose Initial Parameters Pick safe starting values based on prior experience or vendor guidelines. If unknown,

1) What goes wrong outdoors (quick symptoms → likely causes) Dim/black screen, flicker → backlight PSU/LEDs aged or damp; supply fluctuation; thermal shock damage. Condensation/fog under cover → low enclosure rating; cracked/aged sealant; water ingress. Mottled image / color shift → LCD chemistry aged by heat/UV; driver IC faults. Touch failure → oil/film on surface;

Scope: open-channel/current meters, insertion velocity probes, electromagnetic/ultrasonic velocity sensors used in water resources, environmental monitoring, and industrial processes. 1) Why calibration is essential Eliminates drift: Sensors age; electronics drift; mechanical parts wear; ambient conditions change. Calibration removes systematic error so readings remain traceable to national/industry standards. Protects decisions: Discharge calculations, compliance reports, and control loops

1) Purpose & Scope This guide helps maintenance, QA, and operations teams decide when an instrument has reached its practical service life and should be overhauled, replaced, or retired. It aligns with regulatory, safety, and economic considerations across process industries. 2) Clear EoL Criteria (Trigger Any One → EoL Decision) Regulatory non-complianceFails compulsory verification or

1. Purpose & Scope This guide defines what to check during routine field rounds and system checks for instrumentation in chemical plants. The goal is to detect abnormalities early, prevent trips/incidents, and ensure on‑spec product quality. 2. Core Tasks of Inspection Identify abnormal instrument conditions promptly and address them before they cause unit shutdowns, safety

1) Define the Duty (Process Requirements) Maintain temperature (Tₘ): e.g., anti-freeze (>0 °C) or process hold (50–100 °C). Max exposure temperature (Tₑₓₚ): abnormal heat, upset, or external sources. Select jacket & cable class with T rating ≥ Tₑₓₚ. Recommended cable type by duty Self-regulating (SR): maintain ≤ ~130 °C; auto-throttles output, safer on overlaps. Constant-watt

Introduction When selecting, using, or maintaining an industrial instrument, it is essential to understand the quality indicators that define its performance. The six most common indicators are: Accuracy Hysteresis (Backlash/Variation) Sensitivity Dead Zone Stability Response Time These parameters are the foundation for evaluating whether an instrument meets the requirements of industrial processes. 1. Accuracy Accuracy

Purpose. This note summarizes why interlock functions may mis-actuate or fail to act, and what to do about it—covering instruments, logic design, installation/maintenance, and people/process. 1) Instrument-Related Factors Quality & accuracy. Low-cost, mixed-quality instruments degrade stability/accuracy and raise the risk of spurious trips and nuisance alarms when used as interlock initiators. Aging & wear. Sensing