principle of rtd
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Answer / alexpandian
Working principle:RTDs r having the property of changing
its resistance on change in temperature in the predictable
way.So, to measure this resistance (to indirectly measure
the temp.)small amount of current(mostly 1ma) will be
passed through the circuit.I n this way the temp. will be
measured by RTD.
| Is This Answer Correct ? | 20 Yes | 1 No |
Answer / amar
rtd based on the positive temperature coefficient(resistance
increase as increase in temperature), metal used in rtd are
platinum, copper nickel etc
| Is This Answer Correct ? | 4 Yes | 1 No |
Answer / g. venkat narayanan
HI FRIENDS
RTD PRINCIPLE IS
TEMPERATURE INCREASE
RESISTANCE INCREASE
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / jayesh
RTD:- resistance temperature detectors
rtd is used to measure temp basicly metal used in rtd
platinum.
| Is This Answer Correct ? | 3 Yes | 8 No |
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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