why 4 to 20 ma ,why not 0 to 20 or 3 to 15 or anything
Answer Posted / rabindra ojha
main purpose is for live zero.in system voltage is 1 to 5
volt. used resistance is 250 ohm. at 1 volt and 250 ohm
resistance current is 4ma.like that when 5volt and 250ohm
resistance current is 20ma.so 4 to 20ma.
Is This Answer Correct ? | 47 Yes | 6 No |
Post New Answer View All Answers
How do you identify an orifice in the pipeline?
for oil & gas industries which zone is normally preferred? why? give its example?
What is Positive Calibration and Negative Calibration?
IS there any effect of vortex in low pressure side of the transmiter after the orific in feed water line? if yes then what is the calculation?
How to fix back the valve actuator stem
Gas equation
what is the PC interface and software for connection to ABB logic module “ LM011-CE18RAC “ ( for Programming ) ??
How to calibration coriolis flow meter?
please send data bank of quetions answers on analytical instrumentation.
1- Explain about HPM 2- What is the FSC and explain the configuration of FSC 3- explain the complete loop of vibration, how it works (field to control room) 4- What is the use of proxymitter? 5- During job your partner effected with H2S then what you have to do. 6- what type of gland packing uses when valve glind is leaking.
how to check earthing,what is minum ohms for proper earthing
How a conductivity sensor & analyzer work at boiler, whats the principle & science is beyond this,How conductivity sensor sence & convert signal & move toward analyzer & analyzer show reading in percent? also what is temperature compensate option in conductivity analyzer
What is the use of double seated valve?
how to calibrate steam control valve in steam turbine
What are the uses of orifice plates?