Types of RTD In API Pharma & Temperature Calculation From Resistance

What Is RTD
Temperature sensors
RTD Classification based on wire & complexity
Temperature Calculation

1. Types of RTD In API Pharma & Temperature Calculation From Resistance By API Pharmaprenuer Tech Subscribe Watch Full Video

2. RTD Types: RTD Classification based on Connections: Simplex RTD: Single goes to one location only. Has one sensor in the RTD so efficiency is less.

3. RTD Types: RTD Classification based on Connections: Dup lex RTD: Single goes to 2 different locations like PLC/DCS/SCADA & Indicator. Has 2 sensor in the RTD so efficiency is high.

4. RTD Types: RTD Classification based on Wires: 2 Wired RTD. 3 Wired RTD . 4 Wired RTD .

5. RTD Types: RTD Classification based on Wires: 2 Wired RTD: Used For Short Distance approx. 2-3 meter after that singles might be inaccurate.

6. RTD Types: RTD Classification based on Wires: 3 Wired RTD: Used For long Distance. 3 rd wired given for resistance compensation. High Accuracy compared to 2 wire RTD. Commonly used in industries.

7. RTD Types: RTD Classification based on Wires: 4 Wired RTD: High Accuracy compared to 2 or 3 wire RTD . Used where high accuracy is required.

8. Temperature From Resistance : Metal has a definite value of resistance at a particular temperature. The value of resistance changes with the change in its temperature and is very predictable. So We can calculate the temperature of metals by knowing its resistance. The resistance of an RTD at any temperature (R T ) can be calculated from the following formula : Where , R o  = resistance of RTD at 0 o C. α = temperature coefficient of resistance T = ( R T /R o - 1 )/ α

9. Temperature From Resistance : For Example: for RTD PT100 , R o  = 100 ohms, α = 0.00385 ohms/ o C & R T Showing in multi-meter is 150 Ω Then What will be T: T = ( R T /R o - 1 )/ α T = ( 150/100 - 1 )/ 0 .00385 T = 129.8 o C

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