Answer / mahesh bajaj

The transducers are calibrated against reference standards
which are atleast 10 times more accurate then the transducer
to be calibrated.

Let me elaborate by giving an example.

Orifice plate infers flow rate by measuring differential
pressure.so to calibrate orifice plate, reference standard
say magnetic flowmeter is used which measures flow rate.say
flow range is 0-100 lpm and at every 10 lpm, differential
pressure across orifice is measured and constant is evolved
between flow rate and differential pressure. This constant
is also known as discharge coefficient or calibration
constant and one dimensional bernolli's equation is used to
compute this constant.
Now once you know the constant the orifice flow element is
ready to be used in any line size without using any
reference standard.

Hope this helps.

protection relay watchdog contact operation?

0 Answers   L&T,

---

how checking is done in fiber optic cable? explain the working of RTU?

5 Answers   PSU,

---

Valve positioner and actuators in detail.

0 Answers   MIEPL,

---

WHAT IS MEANT BY PROJECT MANAGEMENT STRATEGIES IN INSTRUMENTATION?

0 Answers  

---

How can i copy program (parameter) from mm440 (V.F.D.) by using BOP?

0 Answers  

---

---

What is open loop checking and close loop checking

1 Answers   BARC, NTPC,

---

my temperature transmitter in field showing 700 degree , whereas in dcs showing 459 degree, how to resolve this?

4 Answers   ONGC,

---

What is meant by cold float of compressor shaft.

1 Answers   Sabic,

---

What is PDS and PDMS ?

0 Answers  

---

plz... clarify my answer, how to calibrate vaccum (DP)leveltransmitter,it is hart. (digital).DETAILS:(coloumn)closedtank height 2650mm,and tx range is 0-1500mmH20.

1 Answers   KNPC,

---

in a electronic controller why we are using 250 ohm resistance in input signal?is i/p is necessary in control valve when we are using electronic controller give details?

3 Answers   IOCL,

---

whats the problem will arrise if we rotate the hosing screw of the differential pressure transmitter?

1 Answers  

---