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how to measure temperature from resistance of rtd?and how to
measure temp from voltage of thermocouple?is there any formulas?
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Answer Posted / amit
Temperature measurement.
With RTD:
The Material used Is Platinum Which is very Sensitive to
the temperature as the temperature Changes the Resistance
changes.Which is next connected to form a Weatstone bridge
in the transmitter then According to the formula
R1/R2=R3/R4 since R2,R3,R4 are Constant So Change in RTD
Resistance R1 The Corresponding mA Signal is Obtained
through the transmitter to the system in control room.
With T/C:
Were As T/C is the Formation of two diffrent Material
Combined to form a T/C(SEEBACK EFFECT)As they r two
different materials Change in temperature Causes the change
in EMF generation between the two materials,This mV Signal
is then Transmitted to Marshelling cabinet to Convert it
into V because all Digital Signal read minimum 5V,it is
Converted by OP-Amp with 250ohm Resistance Across it whict
is convinient to DCS to read it.
| Is This Answer Correct ? | 7 Yes | 5 No |
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