why relays are used with plc?

4 Answers  

---

In control valves (like feed water control valve) we will give 3 kg pressure and how it controls 110 kg of water pressure?

4 Answers   SSL,

---

Introduce yourself which is not present in your biodata?

0 Answers   GAIL,

---

Explain the working principle of variable frequency drive?

0 Answers   ABB,

---

What the basic of communication?

4 Answers   Schneider,

---

How to convert gpm into inches of eater.I nerd formula with example so pls help me.

1 Answers  

---

HOW DPT WORKS?

6 Answers   Essar,

---

1 > HOW TO MEASURE INTERFACE LEVEL 2 > DIFFERENCE BETWEEN RADAR & ULTRASONIC LEVEL TRANSMITTER

3 Answers   Atul Auto,

---

what is skin type thermocouple? how it is installed? what is the difference b/w thermocouple & skin type thermocouple? what is gounded & non-grounded thermocoplle? what is the diff b/w these two?

2 Answers   KazStroy Engineering, PSU,

---

can we replace a slot sensor (inductive type) with limit switch (potenial free contact / no-nc type).

0 Answers   Max India,

---

how to online calibration of remote seal tx.

0 Answers  

---

What is DeltaV?

2 Answers  

---