Answer / palaniappan balagurusamy

Flame scanners detect the UV or IR waves generated from the
hydrocarbon combustion. Visible type flame scanners are
also available.

Each type of hydrocarbon give out different frequencies of
UV / IR / visible spectrum.

Intensity component of the flame in a flame scanner is
detected to show the operator how intense the flame is.

The frequency of the flame is detected to discriminate
between different hydrocarbon flames. For example in an
boiler combustion flame scanner using oil and coal in
different elevtions, this facility will be useful. The
flame scanner in one elevation buring oil will not sense
the flame of the other elevation burning coal.

why in vortex flow transmitter dcs range is configuring less than sensor range. eg (sensor range 500-25000 kg/hr and dcs range 0-24000 kg/hr).

1 Answers   Daelim,

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kindly tell where orifice,nozzle,air foil,ventury used in flow measurement?

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please tell me five types of fault of control valve and positioners?please

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what is Green field /brown field exposure in chemicals /oil /petrochemicals /refineries /paints /speciality chemicals /gas /FMCG /glass industry

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what is temperature compensation?

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Controller not working in auto mode?...what are the problem can occur...Pls explain

1 Answers   Aramco,

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what is buoyancy law?

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Hi friends, from Aug 4th onwards iam getting spikes for analog inputs in our DCS for a period of 800ms. I throughly checked every thing, finally i found that the DI, DO's from MCC panels shields are terminated in the Signal Earth where Analog Input signals shields are terminated. Is there any problem with this type of termination?. i checked the induction voltage from MCC and getting around 25VAC, please suggest me in this concern. Our plant is 8months old only. DCS is Siemens Make Simatic PCS7, and the transmitters are Yokogawa make.

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how to install the Ph and Conductivity analyser? is there are any procedures which has to be maintained.

2 Answers  

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what is thermo coupler and how it works

2 Answers   Tisco,

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in my plant 100% feedwater control v/v is air to close but due to instrument air fail,the valve opens but instead of drum level high its get tripped in low low drum level.the urv of level tx is 0 and lrv is -800.pls tell me the reason. for such behaviour.

1 Answers   Sirpur Paper Mill,

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

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