Safety controller drives asset management system
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Hima Paul Hildebrandt product story
Edited by the Engineeringtalk editorial team
May 25, 2006
Hima Paul Hildebrandt has combined its H51q safety controller, with the H 6200 intrinsically safe analogue isolator and the H 6210 Hart multiplexer to form an asset management system.
Hima Paul Hildebrandt has combined its H51q safety controller, with the H 6200 intrinsically safe (ATEX) analogue isolator and the H 6210 Hart multiplexer to form an asset management system.
The benefits of asset management systems lie predominantly in reduced maintenance costs.
Whereas previously maintenance had to be carried out indiscriminately, digital field devices can now be gathered in a higher-level system and comprehensive diagnostic data can be displayed.
This offers in particular the opportunity for preventative maintenance and results in lower personnel requirements, reduced plant standstill and material costs and subsequently overall savings in reduced maintenance costs of up to 50%.
The diagnostic data from the field devices is extracted as Hart signals by the SIL 3 and ATEX certified H 6200 intrinsically safe analogue isolator.
The H 6210 Hart multiplexer - also the first in the world to be SIL 3 and ATEX certified - collects the data from up to eight analogue isolators and passes them via the integrated RS485 interface to a Hart/OPC server which transmits the diagnostic data to the asset management system.
At the same time the Hart multiplexer can protect the field devices against unauthorised modifications of their parameters in accordance with SIL 3 requirements.
The 4-20mA signals are directly coupled to the H51q safety controller and can be used for safety functions.
In practice the benefits of the asset management also materialise in the option to carry out partial stroke tests on valves.
Safety-related valves are subject to a rigid proof test interval for which the plant has to be decommissioned.
Otherwise the usually single channel valves cannot be tested at full stroke.
Short proof test intervals inevitably lead to high costs due to the frequent and - in relation to the overall lifetime of the plant - lengthy downtimes.
Using a partial stroke test these proof test intervals can be extended and the plant safety optimised.
For example, combining a Hima safety system with Samson valves with intelligent positioners, this can be parameterised via an asset management system using the Hart protocol, and can be used to trigger and execute the partial stroke tests at defined intervals.
Via a safety-related initiator transmitting a feedback signal to the Hima safety system the successful completion of the test can be reliably detected.
In addition, comprehensive diagnostic data from the Samson valve can be read via Hart from the asset management system.
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