Answer / guest

LVDT has an ac excitation. the outputs of secondaries are
added in opposition, and indictaes the deviation in
position of the core from the null position. For detrmining
direction of movement, the excitation voltage of primary is
used as reference, and the phase of the (summed) secondary
is identifed using a phase sensitive detector. This is a
synchronous switch operated with primary excitation, and
rectfies the secondary output is such a way as to produce
positive voltages in one direction (of movement of core)
and negative voltage in the other direction.

Answer / sandiv

By measuring the primary and secondary voltages and compare
this with the null position.the movement can be identified
easily

what is PID n give me brief info. about P&I&D.

2 Answers  

---

How to convert 4 wire level transmitter connection to 2 wire.

2 Answers  

---

what is difference between DO and DI

6 Answers  

---

What is Burnout feature in a recorder?

1 Answers   CCIE,

---

Can we use mov instead of esdv Explain the reason

1 Answers   KOC,

---

what is difference btween rotameter and orifice plate?

3 Answers  

---

what are the steps I have to deal with?

0 Answers   ONGC,

---

What is possitive and negative feedback?

3 Answers   KNPC,

---

Is there devices to convert mechanical energy/rotational energy into electrical energy.......? PLease suggest me....

6 Answers  

---

How to Calibrate Ultrasonic Level Transmitter in field

0 Answers  

---

what is the difference between plant earth and instrument earth? and what type of cable( cable size ) used for both? and why ?

0 Answers  

---

What is SCADA ? WHAT is it role in DCS ?

3 Answers   Honeywell,

---