Answer / satyajit

4-20 mA is used to discriminate between process 0 and
instrument 0.

Answer / parmar.ic@gmail,com

all types and levels are 4-20ma and 0-10mv v pule etc
because in industries somthing we assume in 0mA so the
control room is not understand outbut on the panel is not
display so any signal are come in panel and out put is
uderstand so 4ma any signal and it understand this procees
is any problem .so analo and digital I/O used in process
controle application are levels 4-20mA and 0-10v,mV

what is differnace between radar level tranmitter & hart type tranmitter?

3 Answers  

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We have a Yokogawa Micro-XL DCS, which is having around 300 I/O, but whenever there is any wire gets grounded in field, the 24v supply to all loops gets dipped & all the indications at DCS goes to IOP(shows input open), at present we have fixed 500mA fuses in all the lines but which does not working. Does it required to replace with lower amps fuse, then how much or is there any other solution for this.

2 Answers  

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if i change range of flow transmitter in th field then does it need to change range in dcs?

3 Answers  

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what is upstream and downstream in liquid flow?

6 Answers   Thermax,

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What FLOW METER generally used in Gas plant?

5 Answers   Gasco,

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We do have a problem in the company that is one PT connected to PlC which is mean 1 out of 1 in PLC system we do have the PAHH is 55 mbar and PALL 8 mbar with a timer of 15 sec for the PAHH the problem started when PAHH goes more than the set point which is 55 it reached up to 71 but due to timer doesn't trip . We force it and we checked everything nothing there . We replaced the transmitter problem still there the reading goes more than the 55 bar the range for transmitte is 0- 60 mbar . So we did loop check , aculaizing valve , wiring all are okay . What the possible causes for this ???

2 Answers   National Petrochemical Company,

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any one can send me instrumentation previous interview papers? I prepare for MNC Company Interviews? my mail id- Rakesh.Golla@dodsaldxb.ae , and another mail rakesh.gvk@gmail.com

0 Answers  

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what is the input of digital RPM indicator during the calibration time?

1 Answers  

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I want to take temp. data from recorder to computer. Which communication system is best from this option(Rs 232- 485/ethernet/USB)?

3 Answers  

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how will you check torque value during Factory acceptance Test for control valve/ESD ON/OFF VALE how will you confirm this torque value is being correct, Which document will you be refer.

0 Answers  

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Before erect the instrument what should you do?

3 Answers   L&T,

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0 Answers  

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