Author name: Sivaranjith

Instrumentation Engineer

What is a smart transmitter?

What is a smart transmitter? A microprocessor-based smart transmitter has a memory that can perform calculations, produce diagnostics and out-perform older, more conventional transmitters when it comes to accuracy and stability. A Smart Transmitter will also have a wireless communication protocol which can be used to interpret the measurement values of the transmitter and to …

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51 PLC interview questions

1. What is PLC? Programmable logic controllers, also called programmable controllers or PLCs, are solid-state members of the computer family, using integrated circuits instead of electromechanical devices to implement control functions. They are capable of storing instructions, such as sequencing, timing, counting, arithmetic, data manipulation, and communication, to control industrial machines and processes. PLCs can …

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What is sensor trim in a smart transmitter?

In a conventional analog electronic process transmitter typically have only two calibration adjustments: one for zero and another for span, modern transmitter offers more components in need of adjustment. Smart transmitter: The aim of the analog-to-digital converter (ADC) is to transform the electrical output signal of the pressure sensor into a digital number understandable by …

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Pneumatic vs Electrical actuators

The main difference between pneumatic and mechanical actuators is their working speed. The two systems are so distinct, that one can not replace the other with a drop-in. Each one has its own intrinsic benefits and disadvantages: Advantages of Pneumatic actuators: The pneumatic actuators ‘ greatest advantage is their failsafe operation. Through engineering the compressed …

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PLC learning series 16: PLC Documentation

Documentation is the process of orderly collection and record of data about machines or process and about both hardware and software components of its control system. Such documents are a helpful guide in the design, implementation, deployment, testing, and maintenance of applications. Benefits of using PLC documentations: PLC documentation is used by system designers during …

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Electrical Actuator

How to select an actuator for valve?

The actuator is an essential part of the control valve, which drives the control valve stem. In order to select an appropriate control valve, an engineer should know about the varieties in valve actuators and its specifications. The actuator for a valve is selected based on one or all of the following factors: Safety Reliable …

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How to do Megger test/insulation resistance for transformer?

How to do Megger Test/Insulation Resistance for Transformer?

Transformers are one of the costliest equipment used in distribution and transmission process of power. The transformer has to go through different testing procedures periodically to prove that the transformer works properly. Deterioration of the transformer insulation resistance is one of the most common causes of failure of the transformer: a failed transformer is a costly replacement …

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What is HIPPS?

HIPPS: HIPPS is part of the Safety Instrumented System (SIS) to avoid overpressure by shutting off the source and collecting the pressure on the system’s upstream side. Instruments provide the security function in HIPPS. The Safety Loop is made up of one or more initiators, final elements, and a logic solution. HIPPS provides protection against overpressure …

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