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what is the difference between(Flame proof/Explosion proof)&
Fire proof instruments.Both are same or different & if
different in which way because the transmitter which have
approved ATEX flame proof enclouser but it use PTPE O ring
& PTFE Head Gasket,so its (fire safe/fire proof)????????
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Answer Posted / m mouse
Flame Proof or Explosion proof equipment is used in a
Hazardous area where an explosion may occur due to
electrical short circuit or arching of contacts. The idea is
to contain any ignition that may occur inside the
fitting/enclosure such that it does not ignite any gas/dust
or other explosive media outside of the fitting/enclosure in
the general working environment.
Fire proof is just what it says and has nothing to do with
Atex OR Ex equipment, other than the fact that Atex OR Ex
equipment will usually be inherently fire proof because of
their design.
| Is This Answer Correct ? | 3 Yes | 2 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 =
