AUMA AC 01.2-SIL Functional Safety Actuator Controls
Overview
The AUMA AC 01.2-SIL is the functional-safety version of the AUMATIC actuator controls, offered as AC 01.2-SIL for non-hazardous areas and as ACExC 01.2-SIL for explosion-proof duty. It adds a dedicated SIL module to the standard AC 01.2 platform so that SA .2 multi-turn and SQ .2 part-turn actuators can be used in safety-related systems. When a safety function is requested, the standard logic is bypassed and the safe SIL module executes the demand, which means the safety function always overrules normal operation.
In Oman and the GCC, Seven Star LLC proudly supplies the AUMA AC 01.2-SIL to customers across the Sultanate of Oman and the wider GCC. We work with process safety engineers in Oman and the GCC to align SIL actuator selection with the plant safety requirement specification.
Operating Principle of the AUMA AC 01.2-SIL
In a conventional emergency shutdown loop, a valve actuator must reach its safe position even when the normal control path has failed. The AUMA AC 01.2-SIL achieves this with redundant, low-active 24 V DC inputs that are monitored for wire breaks. Safe ESD can be configured to run to end position CLOSED or end position OPEN. An optional Safe STOP function adds two inputs for STOP in the OPEN and/or CLOSE direction, and Safe ESD and Safe STOP can be combined, in which case ESD has priority. Safety functions are executed independently of the position of the LOCAL – OFF – REMOTE selector switch.
The AUMA AC 01.2-SIL is TUV Nord certified according to IEC 61508 Ed. 2 and is suitable for safe OPENING/CLOSING (ESD) up to SIL 2 in single-channel systems and up to SIL 3 in redundant systems, safe STOP up to SIL 2, and safe end position feedback up to SIL 2 or PL c according to ISO 13849. Continuous self-diagnosis supervises actuator operation, the redundant wiring and the internal SIL components, and any fault generates a SIL collective failure signal through a potential-free change-over contact.
Engineering Design of the AUMA AC 01.2-SIL
The AUMA AC 01.2-SIL retains the full AUMATIC feature set: illuminated graphic display, lockable local controls, Bluetooth commissioning, optional positioner and PID process controller, and fieldbus interfaces including Profibus DP/DP-V2, Profinet, Modbus RTU/TCP, Foundation Fieldbus, HART and WirelessHART. The SIL module is an additional hardware layer; the optional external 24 V supply of the electronics refers only to the standard components, not to the SIL components. Enclosure protection is IP68 with KS corrosion protection, and the ambient temperature range of the standard version is −25 °C to +70 °C, with an extreme low-temperature option down to −60 °C.
Because functional safety restricts the configuration, the actuator must carry a blinker transmitter, is supplied with the motor locked in the disengaged position until the lock is released, and only clockwise-closing versions are permitted. Selectable seating types for safety operation include forced limit seating, forced limit seating with overload protection, forced torque seating, or no seating, so the safety behaviour can be matched to the valve design. Torque monitoring and thermal protection can be bypassed during safe ESD when the process requires the valve to reach its position at any cost.
Key Features
The AUMA AC 01.2-SIL brings certified safety performance to electric valve actuation:
- TUV-certified according to IEC 61508 Ed. 2 for safety instrumented functions on SA .2 and SQ .2 actuators.
- Safe ESD OPEN or CLOSE with redundant low-active inputs, applicable up to SIL 2 single-channel and SIL 3 in a 1oo2 redundant arrangement.
- Optional Safe STOP OPEN and Safe STOP CLOSE, combinable with either ESD function.
- Wire-break-proof 24 V DC safety inputs and continuous monitoring of wiring, actuator operation and internal SIL components.
- Optional safe end position feedback up to SIL 2, or PL c per ISO 13849 under a separate declaration of incorporation.
- Safety functions execute regardless of the LOCAL – OFF – REMOTE selector switch position.
- Explosion-proof ACExC 01.2-SIL variant for hazardous areas with the same safety functions.
- Full AUMATIC diagnostics, data logging and fieldbus options remain available alongside the safety module.
Industrial Applications
Safety instrumented systems protect people, plants and the environment in oil and gas, petrochemical, power and chemical facilities. In Oman, the AUMA AC 01.2-SIL is relevant to emergency shutdown valves on wellhead and pipeline manifolds, boiler and turbine fuel isolation, burner management and high-integrity pressure protection valves, as well as isolation valves on hazardous chemical storage near the industrial zones of Sohar, Duqm and Salalah. Its fieldbus capability allows the same actuator to take part in normal process control and in the safety loop with the standard logic bypassed during an emergency.
In Oman and the GCC, Seven Star LLC supplies the AUMA AC 01.2-SIL and the explosion-proof ACExC 01.2-SIL together with matching SA .2 and SQ .2 actuators, and can support engineering teams who need safety manuals, declarations and configuration advice for SIL verification. Selection of the right SIL architecture always depends on the plant safety requirement specification, which our team will coordinate with AUMA. Related AUMA products worth comparing with the AUMA AC 01.2-SIL include the AUMA MATIC AM/AC integral actuator controls, the AUMA ACExC 01.2 and the AUMA FQM/FQMEx fail-safe unit, which cover neighbouring duty types and sizes.
Technical Specifications
The table summarises key data of the AUMA AC 01.2-SIL and ACExC 01.2-SIL from the AUMA technical data sheets, both of which can be downloaded from this page.
| Parameter | Specification |
|---|---|
| Model | AUMA AC 01.2-SIL; explosion-proof version ACExC 01.2-SIL |
| Suitable actuators | SA .2 and SQ .2 ranges (ACExC 01.2-SIL: SAEx/SAREx .2 and SQEx/SQREx .2) |
| Safety certification | TUV Nord, IEC 61508 Ed. 2 |
| Safety integrity level | Safe ESD and Safe STOP up to SIL 2 (single channel); Safe ESD up to SIL 3 (redundant 1oo2) |
| Safety functions | Safe ESD OPEN/CLOSE; Safe STOP OPEN/CLOSE (option); combination with ESD priority; safe end position feedback (option) |
| Safety inputs | Redundant low-active 24 V DC inputs, approx. 10 mA per input |
| SIL status signal | 1 potential-free change-over contact (max. 24 V DC/1 A) |
| Explosion protection (ACExC) | II2G Ex de IIC T4 or T3; II2D Ex tb IIIC T130 °C or T190 °C Db IP6x |
| Mains voltage | 3-phase 220–690 V AC, ±10 % |
| Ambient temperature | AC 01.2-SIL: −25 °C to +70 °C; extreme low temperature option to −60 °C |
| Enclosure / corrosion protection | IP68 / KS |
Request a Quote for AUMA AC 01.2-SIL
Submit an RFQ for the AUMA AC 01.2-SIL with the actuator size, supply voltage, required SIL level and hazardous-area classification, and Seven Star LLC will coordinate configuration, pricing and lead time. Both technical datasheets are available for download on this page, and our instrumentation division in Muscat can support your engineering and procurement teams. In Oman and the GCC, Seven Star LLC supplies AUMA products on request with local technical support.
AUMA actuator and gearbox types
SA multi-turn actuators handle open-close duty on gate and globe valves, and SAR is the modulating version; the listing includes the SA 07.2, SA 10.2 and SA 25.1. SAEx and SAREx are the explosion-proof equivalents. Part-turn duty on ball and butterfly valves is covered by SQ and the modulating SQR, or by an SA actuator combined with a GS part-turn gearbox. LE linear thrust units convert multi-turn output to thrust, and GHT multi-turn gearboxes extend the torque range up to 120,000 Nm. PROFOX is the compact actuator line. Special items include the seawater-resistant SGM and SGMR part-turn actuators with bronze housings, the SVC and SVCR globe valve actuators and the FQM fail-safe unit. Integral controls come as AM or AC versions.Where AUMA electric actuators are used
AUMA actuators are found in water, power, oil and gas, marine and general industry. In practice that means isolation and control valves in water treatment and pumping stations, power plant steam and cooling systems, tank farms and pipelines, and sluice gates and dampers.Ordering AUMA actuators and parts: what we need
For a replacement send photos of the actuator, motor and controls nameplates: type, order number, serial number and wiring diagram number. For a new actuator we need:- valve type, required torque or thrust, and turns or stroke
- valve mounting flange and stem or shaft details
- output speed, duty (open-close or modulating)
- supply voltage and frequency, control signals or fieldbus
- enclosure protection, ambient temperature, Ex requirement
Browse AUMA products by category: Valve Actuator, Industrial Communications.
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