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; […]
Outdoor LCD Maintenance for Industrial Instruments Read More »
1. Introduction In process industries such as chemical, petrochemical, and power generation, flow measurement is a critical parameter for process optimization, cost control, and safety assurance.Among various flow meters, differential pressure (DP) flow transmitters hold more than 60% of the market share due to their simple structure, strong adaptability, and wide applicability. However, the accuracy
Why Differential Pressure Flow Transmitters Require Regular Purging Read More »
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
Why Calibrating a Velocity Meter Matters Read More »
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
Determining Instrument End-of-Life (EoL): A Practical Guide Read More »
Pressure sensors play a critical role in industrial applications. In real operating environments, their performance can be affected by multiple interference factors, and in severe cases, the sensor may even be damaged. Therefore, quality testing is essential. The evaluation can be divided into two major aspects: interference immunity and measurement accuracy. 1. Interference Immunity Tests
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1. Introduction In industries such as energy, chemical processing, and food production, accurate fluid measurement is critical for process control, fiscal metering, and safety compliance. The Roots flow meter, also known as the lobed gear meter, is highly regarded for its precision in measuring high-viscosity fluids. However, its mechanical accuracy must be maintained through regular
Calibration and Verification of Roots (Lobed Gear) Flow Meters Read More »
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
Chemical Instrumentation Inspection Guide Read More »
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
Heat-Trace Cable Selection Guide Read More »
1) Concept & Scope Interface level means the height of the boundary between two immiscible liquids of different densities (e.g., oil–water). A dual-flange remote-seal differential pressure transmitter infers the interface height from the pressure difference created by the two liquids across the measurement span. Typical uses: separators, coalescers, desalters, and oil–water interface tanks. 2) Media
Interface Level Measurement with Dual-Flange DP Transmitters — Practical Notes Read More »
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
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