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What is a PLC?

What is a PLC?

Controls, PLC 13 Tháng Sáu, 2014 at 12:34 chiều

Programmable logic controllers (shown in Figure 1) are now the most widely used industrial process control technology. A programmable logic controller (PLC) is an industrial grade computer that is capable of being programmed to perform control functions. The programmable logic controller is designed for multiple input and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibrationRead More

Difference between PLC,DCS & SCADA

Difference between PLC,DCS & SCADA

Controls, DCS, PLC, SCADA 13 Tháng Sáu, 2014 at 12:19 chiều

In the past the strength and weakness of both the automation technologies were well understood. So it was easy for engineers to select the one that suits their application, but now due to the advent of microprocessors both the technologies are merging.The requirements which are thought to be exclusive to one technology can be found in the other one too.ButRead More

Bourdon Tube-Type Pressure Detectors

Bourdon Tube-Type Pressure Detectors

Basic, Instrumentations 12 Tháng Sáu, 2014 at 1:01 chiều

The bourdon tube pressure instrument is one of the oldest pressure sensing instruments in use today. The bourdon tube (refer to Figure 2) consists of a thin-walled tube that is flattened diametrically on opposite sides to produce a cross-sectional area elliptical in shape, having two long flat sides and two short round sides. The tube is bent lengthwise into anRead More

Bellows-Type Pressure Detectors

Bellows-Type Pressure Detectors

Basic, Instrumentations 10 Tháng Sáu, 2014 at 8:35 chiều

The need for a pressure sensing element that was extremely sensitive to low pressures and provided power for activating recording and indicating mechanisms resulted in the development of the metallic bellows pressure sensing element. The metallic bellows is most accurate when measuring pressures from 0.5 to 75 psig. However, when used in conjunction with a heavy range spring, some bellowsRead More

Ingression protection

Ingression protection

Technology 10 Tháng Sáu, 2014 at 6:37 chiều

While reading the instrument specification or electrical equipment specification you might have seen IP classes. IP is interpreted as Ingress protection.Ip calsses stands for specifying the environmental protection of electrical equipments. With ingression protection class we can understand, an instrument can withstand in which environmental condition. While selecting the instrument it is important to consider the ip class. Price ofRead More

How to read P&ID (Piping and instrument diagram) & PFD (Process flow diagram).

How to read P&ID (Piping and instrument diagram) & PFD (Process flow diagram).

Instrumentations 10 Tháng Sáu, 2014 at 4:45 chiều

P&ID: – Schematic illustration of instruments and their interconnection is called P&ID. – Sơ đồ minh họa thể hiện các thiết bị đo và những đường ống, kết nối liên kết với nó gọi là bản vẽ P&ID PFD: Process flow diagram. PFD gives an overview of the plant process. PFD is a simplified version of P&ID. – Mô tảRead More

What is Instrument location layout and Junction box location layout?

What is Instrument location layout and Junction box location layout?

Instrumentations 10 Tháng Sáu, 2014 at 3:54 chiều

What is an instrument location layout? Instrument location layout is a layout which indicates the exact location of instrument/junction box, trench/trays etc. Trench and duct is the path for primary cable and tray is the path for secondary cables. Tray is either made of metals or FRP (Fiber reinforced plastic). What is Junction box and Junction box location drawing. JunctionRead More

Essential documents required for an instrument engineer.

Essential documents required for an instrument engineer.

Instrumentations 10 Tháng Sáu, 2014 at 3:23 chiều

As i said in my previous post here i am going to explain about the documents which is essential for instrument engineers.Four types of documents are mainly used by instrumentation engineers. Instrument index. An instrument index is a consolidated list of all instruments which is used in the plant.Instrument index is made according to the P&ID.In this all instruments tagsRead More

Documents and drawings, which is essential for instrumentation engineer.

Documents and drawings, which is essential for instrumentation engineer.

Instrumentations 10 Tháng Sáu, 2014 at 12:11 chiều

As an instrumentation engineer, one must be familiar with the following documents and drawings. Nếu là một người kỹ sư đo lường, bạn cần phải thông thuộc và nắm bắt các tài liệu và bản vẽ sau: Document/Tài liệu: Instrument index, Instrument list – Danh mục các thiết bị đo Instrument data sheet – Bảng số liệu kỹ thuật thiếtRead More