what is cascade controller ?

6 Answers  

---

how the actually positioner of control valve working? where we gave 3-15psi pressure to I/P converter where it is firstly applied ?- on I/P to positioner then what happen? is control valve operate on 3-15 psi or its bench pressure?

2 Answers  

---

Identification of ss fittings, pilot valves, relief valve.

0 Answers   CCIE,

---

1.In which princeple DP transmeter works? 2.Why UPS system is use for DCS? 3.How drum lvel controller works? 4.What is the difference between glob valve and gate valve? 5.How axial shift probe work & in which princeple it works?

1 Answers   Luberef, Qatar Gas, Reliance,

---

Why 4-20mA SIGNAL IS PREFERRED OVEA A 0-10v signal?

5 Answers  

---

What is the function of positioner in control valves? does the control valve operate without positioner?

3 Answers   Hofincons,

---

What is difference between magnetic flow transmitter & Electromagnetic flow transmitter?

1 Answers  

---

whats the diff b/w zero pressure and obsolute pressure

4 Answers  

---

why we use by pas on a positioner? When can a by pass be not used on a positioner ?

1 Answers  

---

How can a d.p. Transmitter be calibrated?

0 Answers  

---

Tr. Wiring for calibration.

0 Answers   CCIE,

---

If an Instrument has 550 ohm internal resistance and the cable used for that instrument is 0.5 ohm per meter resistance. If the voltage is 12volt.How much length cable can be used?

2 Answers  

---