Krohne has introduced the H250 M40 variable area flowmeter featuring Foundation fieldbus functionality. This guarantees complete integration into and interoperability with Foundation based control systems. This also applies to previously installed devices: the modular design of the H250 M40 launched in 2009 also allows for retrofitting to Foundation fieldbus devices. It is fed completely from the fieldbus and offers much more than previous stopgaps with converters which only converted the 4-20 mA signal to a digital value on the bus.
One of the first buyers of the new variant is a major German manufacturer of turbo compressors: the manufacturer ordered 240 devices in nominal sizes DN 15 and DN 25 to monitor the multi-stage gas seals on compressors used to liquefy natural gas. With the FF functionality, the status of the seal on the shaft end is transferred directly into the control system. This also makes it possible to set the limit values of the flowmeters, realise PID control using the control system and read the integrated totaliser. This type of monitoring is a typical application for the variable area flowmeters, which can still reliably display the measurement even in the event of a power outage.
Case History 198: Cascade control overcomes valve problems.
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There are many processes where it is undesirable for the load to suddenly change quickly, for example in the paper industry. Examples of level control have involved reasonably fast tuning. An example of a level loop tuned this way and responding to a step change in setpoint is given.
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