Answer / carl_ellis

An E/P converter is a voltage to pressure transducer; it
converts 0-10Vdc to 3-15 psi

An I/P converter is a current to pressure transducer; it
converts 4-20ma to 3-15 psi

Either is used to convert an electrical control signal to a
pressure control signal, typically for a valve positioner or
sometimes a valve actuator.

Current signals are the vast majority of signals in the
process world.

Voltage signals tend to be used in machinery or in a
laboratory, because of the voltage loss over long distances
and tendency to pick up noise more than current signals.

The appropriate I/P or E/P transducer is determined by which
electrical signal is in use.

Carl Ellis
Measure First

when we are using HART COMMUNICATOR why we are using 250 ohm resistance while using HART COMMUNICATOR.

7 Answers  

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Operational amplifiers

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There is a problem with our HART475 it is not communicating with smart devices error becomes "NO DEVICE FOUND"we have insert 250ohm resistance as per requirement but invain plz tell me the solution?

1 Answers  

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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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Why Bently Nevada use negative voltage for vibration probes?

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how to convert bar to mA?

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3 Answers  

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0 Answers   ABB, Jindal,

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