1. How many output signals do wew have in process control?
2. Could you write down the names of the pre-commissioning
and commissioning stage test instruments and explain them
(more than 5 items)?
3. What is the first step to commission a transmitter on
service?
4. What is RTD?
5. Find the output value in MA of a temperature transmitter
(RTD Type) at 120degree celius?
6. What is the O/P signal of a pneumatic transmitter?
7. What is the O/P signal of an elctronic transmitter?
8. What is the close loop and open loon?
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Answer Posted / kalla anil kumar,jeypore
1- it may analog and digital, or
2- lot of test instruments like pressure calibrator dead weght testor,(DRUCK),temperator calibrator DECODE BOX,temp bath,For control valve mA source,for vabration (vabolator) etc.
3- we have know the tag,location and application of transmitter,
4-RTD- Resistance temperature detector, it is used up -200 to 600 deg C,
5- first we should know transmitter Range, then we calculate mA, if the range is 120 then 0deg 4mA,30deg 8mA,60deg 12mA,90deg 16mA and 120Deg 20mA,
6- .2 to 1 kg/cm2 or 3 to 15psi
7- 0 to 20mA, 4 to 20mA
8- in a close loop PID control,transmitter, and final control element like control valve,on/off valve, and MOV etc, it will work on auto there will be set valve then controlling out put will come from PID-C, in open loop there will be no set point we have control by manual,
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