Answer / ajith294

Fire and gas system usually as part of a saftey system. the
percentage of Lower Explotion limit shall be dectected by
GAS detector and gives the alarm ,normally 20% is High and
40% is High High alarm.

catalytic bead sensor, semiconductor sensor, infrared point
sensor and ultrasonic sensor are using to detect the gases.

there was no establised standared to difine zero air for
calibration. some procedure says pure nitrogen and some
uses sytetic air. But much more realisitc and practical
using ambient air for zero calibration , when area is
considered to be clean.

for span calibration using 2.5 %Methene (CH4) and balance
nitrogen mixer. 2.5 %Methene (CH4)is equal to the 50 % of
LEL.

Answer / mohamed yousuf

fire and gas system is nothing but to detect the toxic,
flamable and combustible gases in the plant and also for
giving the awarness of the hazardous through beacons and
loudspeakers.

Anybody know how to create a ladder programme for power switch in TV remote without using counter... ie TV can be turn on and turn off using single push button switch... on pressing the switch first time TV turn on and hold the on state till i press the switch again, and after TV turn off.

2 Answers  

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how many type of control valve?

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What are difference between automatic and manual control system?

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We are used CENTUM CS3000 of YOKOGAWA. please tell me how to simulate wihtout FCS and vnet.

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What is the procedure of calibration of Load cell?

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what is commisioning procedure,2)what is is the main work in commisioning in the field tx to dcs, plz send me detail

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how many types of elements are there?

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What is passive connection of instrument in different type of I/O module

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What is rated capacity in Control valve

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What inherent design and operating principles are included in a modern control system to use predictive maintenance practices to increase overall system reliability?

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Whether the DP transmitter can be utilised in the medium of Vaccum for the measurement of Level?

10 Answers  

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