What is meant by Fail Safe Condition in PLC?

4 Answers  

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why we used for range in pnumatic 3-15 psi and current 4-20 ma?

11 Answers   Jindal,

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

1 Answers  

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what is input and output cards of plc needs to be hot swappable mean

1 Answers  

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What is possitive and negative feedback?

3 Answers   KNPC,

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(1) In turbine, what does term CDP, NI, NH, HSSOC, means. (2) What is the purpose of LO overhead tank in turbines.(3) An equipment is certified for EEX, IA, IIC,T6, what do you under stand by this.(4) what is SURGE, and how it is prevented, what is the purpose of bypass valve across AS valve.(5) Give 2 application of quartz crystal used for process parameter measurement.(6) what is meant by cold float of compressor shaft. (7) state four different types of flow measurement. For gas flow measurement mmscfd is the common unit. Expand the unit and specify significance of word S in the unit.(8) what is meant by Gap voltage, in vibration measurement. Normally how much Gap voltage is set and state the reason.(9) what will the new flow factor if D/P transmitter is Re-Ranged from 25” wc to 50” wc.(10) what is the usage of QDV & Volume booster.

0 Answers   ADMA OPCO,

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A temperature sensor (RTD) connected via a temperature transmitter is adjusted to give an output of 4ma at 60 deg and 20 ma at 600 deg. This output (4-20ma) from the transmitter is connected to an IGBT-inverter to control a high speed (-12,000 to +12,000 RPM) DC motor. And in the inverter it is programmed as, for 4ma the motor speed will be -3,000 RPM and for 20ma the motor speed will be +10,000 RPM. The question is : If the motor speed is +5,500 (RPM), what will be the temperature? (-sign indicates that the motion is in reverse direction).

9 Answers  

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why 4ma show higher zero ? i have transmiter flow renge 0-1000 m3/h but 4 ma show in monitoring 200 m3/h and 20 ma show 1000 m3/h i want when 4ma show 0 m3/h and 20ma 1000m3/h

3 Answers  

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how to calibrate the interface leveltrol

1 Answers   Lanco,

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how to check electrical health of vibration probe?

1 Answers  

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what will be the output of the temparature transmitter if temp is 120 degre celcius.

1 Answers   Base Automation, NTPC, PDO,

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Can we use twisted pair cable instead of ethernet for communication?

1 Answers   Yokogawa,

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