Can we use PLC in Hazardous Area?

2 Answers   MNHG,

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why any measurement made interms of pressure is more accurate ? to be more precise most of the flow velocity is made interms of pressure and it is accurate. what is the reason behind pressure measurement being accurate ?

0 Answers   NATPET,

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why use squareroot in flow measurment by dp transmitter?

4 Answers  

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flow transmitter range is 0 -500 mmwcc but the transmitter shows 12 ma for o mmwc instead of 4 ma ...how to solve this problem when we apply 375 mmwc it shows 16 ma

3 Answers  

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How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

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What means zero and span in transmitter callibration.

8 Answers   Bajaj, Wartsila,

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Can I put my meter across an RTD to check it safely witout tripping the equipment when it is connected to an monitoring device eg.RTD module or IQ 1000

1 Answers  

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How addressable fire systems work? Pl. send details with architect.(Loop), also send details regarding Gas system. Pl. help me.Thanks

0 Answers   Siemens,

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any body please send me the old question papers of ongc test.

0 Answers   NTPC,

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rtd principle?thermocouple principle?

5 Answers  

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what is linerity and non-linearity?

2 Answers  

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1.In which princeple DP transmeter works? 2.Why UPS system is use for DCS? 3.How drum lvel controller works? 4.What is the difference between glob valve and gate valve? 5.How axial shift probe work & in which princeple it works?

1 Answers   Luberef, Qatar Gas, Reliance,

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