Answer / mohammed emaaduddin

I donno the exact number of methods of temperature
measurement. But the different measuring devices for
temperature measurement are,
Thermometers, Pyrometers, Resistance Temperature
Detectors(RTD), Thermistors, Thermocouples and Thermowells

Answer / sudhansu

temperature can be measured my basically two ways...
a)by direct contact method in which we
have-rtds,tc,thermometers etc. where we have to make direct
contact of transducer with the mesurend.
& b)non contact type like pyrometer

Answer / sandip patel

same with the addition bimettalic strip is also one of the measuring device for the temperature

Answer / imam

rtd.tc .termistor

Answer / abbas

1.mechanical methods(expansion of materials,pyrometers)
2.electrical methods( rtd,tc,thermistors)

Answer / abhay raj

exactly the same answer as stated in ans. no- 4.

non contact method used to measure temperature is- RADIATION
PYROMETER

How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

How to calculate P,I&D value in PID controller ?

0 Answers   Jindal Steel and Power, SAL Steel Power,

Explain working principle of lvdt?

0 Answers  

Questions on flow meters,few questions on HART protocol,

0 Answers   Monnet,

what is difference between pressure,flow and level control valve.

3 Answers  

Explain the difference between mmwc and mmwg?

0 Answers  

Which type of diagphram use in costic line,DM water line,natural gas line,oil line?

0 Answers   Hindustan Zinc,

Difference between guide wave radar & non guide wave radar ?

1 Answers   UPL,

How can corrosion alter the accuracy and precision of a C- Bourdon tube pressure gauge?

1 Answers  

WHAT IS THE DIFFERENCE B/W PLC and DCS

10 Answers   Bhel,

What is the use of each wire in three wire RTD

0 Answers   GSPC,

What is controller? What is transmitter?

1 Answers