As automatic tank gauge has evolved, the series servo level gauge has become an industrial standard all over the world. Very reliable, versatile and accurate automatic tank gauge with a minimum of moving parts, meeting all international standards, regulations and recommendations.
The multi-functional instrument is modularly constructed. The servo gauge is equipped with a Servo Auto Test feature which further increases the safety integrity of the servo and increases the diagnostic coverage. That means that the Servo can be used in overfi ll protection loops to prevent spillage. What is unique about this SIL-2 solution is the fact that all installed servo gauge worldwide can be simply loaded with a software add-on that allows it to be used in SIL-2 safety rated loops. The increased diagnostics in the gauge will detect failures inside the gauge or in the application and report this to higher level systems for further action. With the added diagnostics, the safety prooftest interval can be extended to 5 years.
This will signifi cantly bring down the operational cost compared to other solutions that require a proof test to be carried out every year. The Servo level gauge has a SFF (Safe Failure Fraction) > 90% which allows it to be used in SIL-2 safety loops. If used in redundant confi guration, the servo automatic tank gauge can be used in SIL-3 rated loops.
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