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What is NAMUR standard and why its allways reletad with
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NAMUR was founded at Leverkusen on November 3, 1949, as the
body to represent the interests of the users of measurement
and control technology in the chemical industry by such
renowned experts in the field as Dr. Sturm (Bayer), Dr.
Hengstenberg (BASF) and Dr. Winkler (Hüls).
At the second meeting in December 1949, the founding
members of the working group settled the name:
Standardization association for measurement and control in
chemical industries - abbreviated to NAMUR.
In accordance with the state of the art, NAMUR’s subtitle
was changed in 1996 to "Interessengemeinschaft
Prozessleittechnik der chemischen und pharmazeutischen
Industrie" (Process Control Systems Interest Group of the
Chemical and Pharmaceutical Industries); and on 9 November
2005, the subtitle was changed again
to "Interessengemeinschaft Automatisierungstechnik der
Prozessindustrie" (Automation Systems Interest Group of the
Process Industry). The NAMUR logo remained unchanged.
In the post-war years, the main activities in process
measurement were the improvement of measurement, control
loop analysis, standardization, especially of interfaces (4-
20 mA signal, NAMUR Initiator [proximity switch]), i.e. the
emphasis was on the standardization and exchange of
experience relating to measurement and control devices.
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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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