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HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE
BETWEEN THERMOCOUPLE AND RTD
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Answer Posted / hafiz muhammad traiq nizami
the output of thermocouple is mV so check the mV in diff
temperatures and the output of RTD is resistance so measure
the resistance at normal temp it should be greater or equal
to that ohm specific of RTD type .For Example if it is PT100
so it will shows minimum 100 ohm if RTD is in working condition.
Diff bet T/C and RTD
both are used to measure temperature but RTD is more
accurate than T/C
RTD can be used upto 800 deg but T/C can be used upto 1750 deg
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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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