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Automated overfill prevention system (AOPS)

Detecting, indicating & preventing overfill easy with IEC 61511 certified system fulfilling API 2350

As a result of recent incidents, there have been systematic overhauls to overfill prevention systems. Industry best practice for managing storage tanks now combines the existing API 2350 prescriptive standards with the IEC 61511 functional safety standards. Our automated overfill prevention system (AOPS) is a facility to detect, indicate and prevent hazardous overflow in your chemical or petrochemical storage tank. Complementing our tank gauging and inventory management solutions.

Addressing the entire safety loop

The API 2350 standard prescribes methods by which owners and operating personnel can prevent tank overfills. It requires the use of a risk assessment system. Functional safety itself can only be applied to complete functional loops. Our complete automated overfill prevention system has been certified by independent, globally operating safety inspectors covering the levels SIL2 and SIL3.

Proof testing of 16 tanks done in less than 5 minutes

According to IEC 61511 and API 2350, the safety function of a device must be tested at appropriate intervals by proof tests. They demonstrate the functionality of the safety instrumented system in relation to the safety requirements. The integrated proof-test of the automated overfill prevention system automatically tests all safety relevant devices such as level switch, safety relays, signal horn and flashing beacon with a single push button.

Done in less than 5 minutes it generates a report which can be printed via USB connection. This significantly reduces your commissioning and maintenance time as well as costs.

Safety with independent Safety Instrumented System (SIS)

In order to ensure safe functionality and meet the highest safety standards, every SIS must be independent of all other control systems controlling the equipment. All control elements including level devices, controls and alarming devices must be dedicated exclusively to the SIS. The automated overfill prevention system is completely independent. Additionally it is equipped with an uninterruptible power supply (UPS) with an on-battery runtime of minimum 30 minutes.

Automated overfill prevention system (AOPS)

Automated overfill prevention system

Improve safety and efficiency at the same

  • High level of confidence and reliability provided by a complete independent SIL2/SIL3-certified solution

  • Reduced commissioning and maintenance time with remote automated proof test procedure

  • Enhanced safety with a independent SIS

  • Support in taking immediate decisions and remedial measures by detailed warning and alarm messages

  • Seamless integration in supervisory systems for remote monitoring enabled by standard interfaces such as EtherNet/IP

  • Automated overfill prevention system AOPS combination API2350 & IEC61511 functional safety standard ©Endress+Hauser

    Automated overfill prevention system (AOPS) combination of API 2350 and IEC 61511 functional safety standard



Endress+Hauser A/S
Poppelgårdvej 10-12 2860 Søborg , Danmark
Tlf.: +45 70 131 132
Fax: +45 70 132 133
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