Programmable Logic Controllers (PLCs) are widely used in industrial automation for precise control and monitoring of machinery. One common application involves integrating PLCs with encoders to measure rotational or linear motion. This article delves into how a PLC can receive and process encoder pulses effectively. 1. Understanding Encoder Types Before integrating an encoder with a […]
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1. Definition and Function A pressure transmitter is an instrument that converts physical pressure parameters (from gases or liquids) into electrical signals such as current, voltage, or digital outputs. These signals are transmitted to secondary instruments, including indicators, alarms, recorders, or controllers, for monitoring and process regulation. Accurate range selection is one of the most
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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
Management System for Calibration of Measuring Instruments and Industrial Meters Read More »
Introduction Pneumatic control valves play a crucial role in regulating process flow in industrial automation systems. However, due to complex operating environments and mechanical-electrical-pneumatic interactions, various faults may occur. This guide summarizes four common categories of failure, their causes, and practical troubleshooting methods. 1. Valve Fails to Actuate Typical Symptoms: Valve does not respond to
Common Failures and Troubleshooting of Pneumatic Control Valves Read More »
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,
PID Tuning — General Steps & Rules Read More »
1) Executive summary Probe wear on RTDs/thermocouples mainly comes from mechanical friction, particle erosion, installation errors, material/geometry mismatch, and vibration/corrosion at temperature. The cure is a mix of correct mounting, flow-aware placement, harder/armored materials, and disciplined inspection/replacement cycles. 2) Primary wear mechanisms (what goes wrong) Poor placement & fixing Tip touching vessel bottom/pipe wall; too
Preventing Probe Wear on RTDs & Thermocouples Read More »
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
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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 »
