Answer / nirmal

cold loop means you still have no any power source
connected on the loop

hot loop means power supply is present on the loop

Answer / raja

SIS instrument LOOP is hot LOOP.
Other normal instrument all is Cold loop

SIS Mean Safety Intergartive System

why we are using pnp npn for sensors is there any other type?

1 Answers   CGL,

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What is the use instrument barriers? Can you give me review materials about this?

1 Answers  

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What do you need to consider when installing a flowmeter

2 Answers  

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whats the reason for control valve not installed -90degree (down position)

1 Answers  

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what is the meaning of Domain server?

2 Answers  

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hi... i'm about to learn siemens plc i came across following question in my mind ... plr ans 1. hw motor operated by plc 2. hw drive operated by plc explain dis by both ladder logic diagram and hardware config , connection

2 Answers   KCP Cements,

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We are using Rosemount 5400 series Radar Level Transmitters in all types of Sump Applications having oily water hdrocarbon petrochemical nature. What we are facing the problem frequently is that always getting reading frezzed at some value. If we do power recycling , sometimes it is working . then making same freezing problem. If anybody faced before such type of problem and also having solution , Please give the answer.

0 Answers   Sabic,

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How to isolate a DPT from line in the condition that process must not be disturbed,and process is also critical and no bypass is available.?

4 Answers   Descon,

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What are the charcterstics of a P&ID controller block for Governor speed raise or lower for a load sharing functionality between 4 Gas turbines in droop mode.

0 Answers   TNPL,

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Describe the concept of Gain Scheduling, as currently found as an option in some controllers.

1 Answers  

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any body tell me ,contol valve has how many cheractristic? explain it.

6 Answers   L&T,

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what is the procedure of O2 sensor(ABB) calibration?

0 Answers   Aramco, Samsung,

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