Extend SIL proof test intervals with new Liquiphant FTL51
Saving time and resources on proof testing with innovative technology
CABB AG in Switzerland attaches great importance to plant safety. That is why it has decided on a new model of the proven tuning fork level switch from Endress+Hauser. Operated in homogeneous redundancy, the new Liquiphant ensures reliable point level detection in a SIL3 safety loop. The device supports CABB AG`s new testing strategy for proof tests, which re-quires a comprehensive SIL proof test to be carried out with almost 100% proof test coverage (PTC) every three years.
Customer benefits
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Shorter intervals in which the measuring devices are inactive reduce the plant's downtime.
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The probability of systematic errors is reduced because the measuring device has to be removed and installed less frequently.
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Thanks to the development in accordance with IEC 61508, the device can also be used directly in SIL safety circuits without the need for additional operational testing by the user
Challenges
According to Michael Lemke, functional safety expert at CABB AG, more and more SIF circuits (safety circuits with a defined SIL level) are being installed in the plant. Accordingly, the maintenance and testing effort increases. This is aggravated by the fact that the time windows for carrying out proof tests are becoming shorter and shorter, while the number of maintenance staff remains the same.
Endress+Hauser solution
The Liquiphant is used in a SIL3 application. It consists of four tanks, which are connected by pipes that communicate with each other. The medium used is thionyl chloride which is acutely toxic to humans. For this reason, the technicians remove the devices for a comprehensive test according to SIL guidelines under full protection. The tank must be emptied and cleaned for this purpose. In the past, the level switch had to be removed for testing every year.
By using Endress+Hauser measurement technology, this effort has been reduced significantly. The new Liquiphant FTL51 is used in 1oo4 architecture and homogeneous redundancy on the tanks. Each individual tank is therefore equipped with a new Liquiphant FTL51. Each of the measuring devices has a Bluetooth interface in conjunction with Heartbeat Technology. This technology makes it possible to verify the level switch within the SmartBlue app while the process is running.
FLEX 선택 | 기술적 우수성 | 단순성 |
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Fundamental 선택 기본적인 측정 요구사항 충족 |
기술적 우수성
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단순성
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Lean 선택 핵심 프로세스를 손쉽게 처리 |
기술적 우수성
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단순성
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Extended 선택 혁신적인 기술로 프로세스 최적화 |
기술적 우수성
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단순성
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Xpert 선택 가장 까다로운 어플리케이션 요구사항 충족 |
기술적 우수성
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단순성
구성에 따라 다름 |