Overfill Prevention System SOP600
4
Hauser
System design
The Overfill Prevention System consists of:
• Cabinet for Overfill Prevention System
– Power unit (optional: redundant power unit, UPS and battery)
– SIL2 or SIL3 Nivotester (transmitter for Liquiphant)
– SIL3 PLC including input/output modules
– SIL3 safety relay
– Cabinet signaling (stack lights)
– 10" touch panel
– 2" text display unit (optional)
• Field signaling (siren and strobe) optionally for AOPS
• Point level switch (Liquiphant not included in system scope of delivery)
• SIL2 or SIL3 type certificate
– The SIL2/SIL3 type certificate considers the point level switches (Liquiphant), including the
Nivotester, remote I/Os, safety PLC, safety relay (AOPS) or field signaling (MOPS)
– The AOPS does not take the customer's actuator (valve/pump) into consideration
– A project-specific calculation for the corresponding SIL circuit (including actuators) can be
ordered as an option, or can be performed independently by the customer
Manual Overfill Prevention System (MOPS)
If overfilling is imminent, the system automatically activates signaling in the control room and
safety-oriented signaling in the field. The operating staff must then manually close or switch off the
actuator (valve/pump).
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Manual Overfill Prevention System (MOPS) - overview
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Cabinet for Overfill Prevention System
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Safety relay output
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Field signaling
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Sensor, High-High alarm
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Sensor, High warning
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Actuator to be disabled manually
Automated Overfill Prevention System (AOPS)
If overfilling is imminent, the system automatically disables the corresponding safety relay. Any
actuators connected (valve/pump) are closed/switched off automatically.
