Answer / parth desai

if PLC power failure then whole process will stop.As one
power module for Whole I/O Card.and CPU also working on 24v
DC so as power failure your PLC will in STOP Mode.

Answer / raja

yes but redundancy is provided for PLC . the PLC nearest to
the failure region will take control over the failed one .
in some cases central room is also used to take control

What is ultrasonic flowmeter?

0 Answers  

---

why two probes are used in turbine flowmeters?

2 Answers  

---

Why we used cage in control valve?

8 Answers  

---

why we are not using the turbine flow meter in the steam service?

0 Answers   Jaypee,

---

what is coriolis principle for mass flowmeter?

5 Answers   ABB,

---

how to calculate density?

2 Answers  

---

why we use 3 wire rtd direct wiring for temperature measurement instead of temperature transmitter like bearing temperature

0 Answers   ABG Energy,

---

A DP transmitter is used to measure the level of an open tank. The drain line of the tank is connected to a control valve, and is configured as, if the level of the tank is 90% the valve should get open 10%. And if the tank level is 10%, the valve should get open 90%. Draw wiring diagram and explain how to configure DP transmitter and control valve using HART communicator. If the span error at output is 1%, what will be the %opening of the control valve at 60% level of the tank?

0 Answers  

---

I have installed a RTD whose length is 2250mm(RTD stem length), but it's upper 200 -250mm is out of the reactor, and this upper 200mm stem is surrounded by atmospheric temp. And the lower portion i.e. 2000mm is in contact with the measuring fluid, then does the final measuring temp. Gonna change as the upper 200mm RTD stem is out of reactor?

1 Answers   Process Control Technologies,

---

If mVolts can drop by resistance of wire as compare to mA, then how thermocouple mV reaches in CCR as accurate value?

7 Answers  

---

draw shematic diagram of c/v positioner(smart type)?

0 Answers   Coromandel,

---

whats diffeence between dcs & scada operation.

3 Answers   Orchid, Reliance,

---