AUMA SAREx Explosion-Proof Modulating Multi-Turn Actuator

Overview: Continuous Modulating Control in Hazardous Areas

The AUMA SAREx Explosion-Proof Modulating Multi-Turn Actuator is the modulating-duty counterpart to AUMA’s SAEx range, engineered for valve applications that require frequent, continuous positioning between fully open and fully closed rather than simple open-close operation, all within a certified explosion-proof housing suitable for classified hazardous areas. Where the SAEx is optimized for open-close (Class A) or positioning (Class B) duty, the SAREx is rated for modulating duty – ISO 22153 Class C – at S4-25% intermittent duty, with special versions available for S4-50% where higher duty cycles are required.

As an authorized supplier of AUMA valve actuators, Seven Star LLC sources and supplies the SAREx explosion-proof modulating actuator to refineries, gas processing plants, and petrochemical facilities across Oman and the wider GCC. Because continuous process control valves in hazardous areas depend on both certified safety and modulating durability, Seven Star LLC helps engineering teams specify the correct SAREx configuration for their control loop and classified zone requirements.

Working Principle: Continuous Positioning with Explosion Protection

The SAREx drives a multi-turn valve stem through an integral gear train, with limit and torque sensing providing continuous feedback that allows the actuator to be positioned anywhere between fully open and fully closed rather than only at the two end stops. This modulating capability is what distinguishes Class C duty from simple open-close operation: the actuator must be able to accept frequent positioning commands from a process control loop and settle accurately at intermediate valve positions without excessive wear or thermal stress, hence the S4-25% intermittent duty rating that reflects a defined ratio of running time to rest time appropriate for modulating service.

As with the SAEx range, the SAREx’s explosion-protected construction ensures that motor windings, switch compartments, and terminal areas cannot act as an ignition source, with certification performed in close collaboration with national and international certification bodies. For plants requiring integral local control, the AUMA MATIC AMExC 01.1 actuator controls pairing provides push-to-run or self-retaining control logic, torque or limit seating selection, and automatic phase correction, all within the same explosion-protected envelope.

Engineering Design of the SAREx Actuator

The SAREx is built to IP68 protection standard with single-phase and three-phase motor options depending on model, and covers a torque range from approximately 15 Nm up to 1,400 Nm with output speeds from 4 to 180 rpm, suiting a wide range of modulating valve sizes from small control lines to medium process valves. Ambient temperature rating spans -30°C to +70°C as standard, supporting reliable modulating operation across the temperature extremes common to Gulf-region outdoor plant installations.

The actuator is designed for compatibility with AUMA MATIC AMExC 01.1 controls for multi-turn actuators in the SAEx/SAREx 07.2 to 16.2 size range, giving specifiers a proven, explosion-protected control package rather than needing to integrate separate remote control electronics in the hazardous area.

Key Features

The AUMA SAREx Explosion-Proof Modulating Multi-Turn Actuator delivers certified continuous positioning for hazardous-area process control. Key characteristics include:

• Modulating duty rating (ISO 22153 Class C) at S4-25%, with S4-50% versions available.
• Explosion-proof construction certified for installation in classified hazardous areas.
• IP68 protection class for reliable sealing against dust and water ingress.
• Torque range from approximately 15 Nm to 1,400 Nm; output speeds 4 to 180 rpm.
• Compatible with AUMA MATIC AMExC 01.1 explosion-protected actuator controls for integral local control.
• Ambient temperature range of -30°C to +70°C for outdoor and harsh-climate installations.

Industrial Applications

The SAREx actuator is deployed wherever a multi-turn control valve requires frequent, continuous modulating operation within a classified hazardous area, including refinery process control loops, gas processing plants, and chemical facilities where flow, pressure, or level control valves must respond dynamically to changing process conditions. Its ATEX-class certification makes it the compliant specification choice for these duty profiles rather than a simple open-close SAEx unit.

Seven Star LLC supports refinery engineering teams, EPC contractors, and plant maintenance departments across Oman, Muscat, Sohar, and the broader GCC region with sourcing of AUMA explosion-proof modulating actuators, helping projects meet both process control and hazardous-area compliance requirements.

Technical Specifications

The table below summarizes the core specifications of the AUMA SAREx Explosion-Proof Modulating Multi-Turn Actuator as supplied by Seven Star LLC.

Call To Action

Seven Star LLC supplies the AUMA SAREx explosion-proof modulating multi-turn actuator with full manufacturer documentation and regional technical support. Contact our instrumentation and valve automation division for a formal RFQ, to confirm the correct actuator size and duty class for your process control application, or to obtain the complete technical datasheet. Seven Star LLC ensures every unit shipped across Oman and the GCC is genuine, correctly configured, and backed by local engineering support.