Answer / king

Rtd is used for low range temperatures based on resustance (ohm law) where as thermocouple used to measure high range temperatures.

Answer / manikandn

tc and rtd using temperature measurement. but rtd is high accuracy characteristics ,but low temperature measurement.thermocouple is high temperature measurement.

Answer / b v s rayudu

RTD works on PTC and exhibits linear characteristics in some region. Platinum material is mostly used, response is slower, high accurate and signal conditioning techniques are bit easier. For RTDs separate excitation required.

Thermo couples (TC) works on Seebeck effect, exhibits exponential characteristics, faster response, cold junction compensation is the disadvantage, separate excitation not required, output signal level is very low.

Answer / dhaval

we also use tc in low range. but main prps high tamreture tc value constant cmpare to rtd and rtd we use in high temprreture that time ohms drop so ..

Answer / mohammad ehtesham khan

TC is a High temperature Sensing element, which is used to measure high temperature and
TC works on the principle of Seebeck effect, the out of TC is MV. TC made by different metal.
RTD is low temperature sensing element, which is used to measure low temperature, RTD works on Ohms law principle, the out put of RTD is ohms

Answer / kshitij parashar

Rtd is conductor type sensor & Thermocouple is semiconductor type sensor.All conductor sensor is used for high temperature measurement and all semiconductor sensor is used for low temperature measurement as per principal for temperature sensing.

What are the maximum packet size of: a) HART b) Profibus DP c)Profibus PA d) DeviceNet e) Foundation Fieldbus

0 Answers   EIT,

line up procedure for dp type flow transmitter?

0 Answers  

how does we calibrate a square root flow transmitter ,give an example and explain it step by step like range calculation , calibration hook up series connection , zero check , and how to apply pressure , and if not geting proportional output then what should we do ?

0 Answers  

what does a positioner in control valve ?

11 Answers  

why we are not using the turbine flow meter in the steam service?

0 Answers   Jaypee,

On drum level, why we are using air to close Control valve?

4 Answers   L&T,

if change the pid in D value so what action.

2 Answers   Siemens,

Someone Please tell me what are the Pre-Commissioning activities in a Thermal Power Plant for an instrumentaion Engg.

0 Answers  

why we use 4-20 mA for calibration of the instruments.why we cant use 0-20 mA?

5 Answers  

what is the difference between scaler and vector drive

0 Answers   Jindal,

Where do we consider the pressure in mbar & where do we consider the pressure in bar & why is it so ?

2 Answers   BOC, Jindal Steel and Power,

why any measurement made interms of pressure is more accurate ? to be more precise most of the flow velocity is made interms of pressure and it is accurate. what is the reason behind pressure measurement being accurate ?

0 Answers   NATPET,