Technical Specifications

Product Introduction

The Schischek REDMAX-15-SF1 is a compact, explosion-proof quarter-turn actuator offering reliable, safety-oriented control for valves, dampers, and other rotary elements in demanding industrial environments. As part of the Schischek RedMax family, the REDMAX-15-SF1 blends robust mechanical design with certified explosion protection, making it ideal for hazardous zones (Zone 2 / Zone 22). With built-in spring return, auxiliary switch feedback, and modular runtime options, the REDMAX-15-SF1 is engineered to deliver precise and dependable performance in critical systems.

Within Schischek’s portfolio, REDMAX-15-SF1 is positioned as the 15 Nm, S-size variant with fail-safe capability, suited for medium-duty control duties. It is specifically tailored for applications where both control action and safe default return are required—such as in damper control, HVAC systems in hazardous areas, or quarter-turn valves in process plants. By incorporating the REDMAX-15-SF1 into an automation scheme, users gain a rugged actuator that offers field-adjustable speeds, diagnostic feedback, and certified safety—serving as a dependable bridge between process control and mechanical actuation.

This actuator plays a critical role in industrial systems: it ensures that valves or dampers move precisely under normal conditions, and that a safe fallback (via spring return) is executed in case of power or control loss. The REDMAX-15-SF1 is fully compliant with explosion-proof standards and is built to operate reliably under harsh environmental stresses, while maintaining compatibility and ease of integration with control systems such as DCS, PLCs, or building automation systems.

Core Advantages and Technical Highlights

Precise control and flexibility: The REDMAX-15-SF1 supports multiple selectable runtime settings (3, 15, 30, 60, 120 seconds for full 95° rotation). This flexibility allows users to fine-tune movement speed to match specific process requirements without changing hardware. The actuator includes two auxiliary potential-free switches (calibrated at 5° and 85°), providing reliable position feedback for control systems or interlock logic.

Spring-return fail-safe capability: A key distinguishing feature of REDMAX-15-SF1 is its built-in spring mechanism, enabling a safe return to default position (fail-safe mode) in case of power loss or control failure. This functionality is essential in safety-critical installations, offering a deterministic fallback and reducing the risk of unsafe operating conditions.

Explosion-proof design: The REDMAX-15-SF1 is engineered for hazardous environments, conforming to gas and dust explosion protection standards for Zone 2 / Zone 22. Its robust aluminum housing, tight sealing (IP66 / IP67), and rugged construction ensure long service life even in corrosive, dusty, or humid settings. The actuator also offers options for stainless steel enclosures or specialized coatings for offshore or marine use.

Wide input voltage range and efficiency: With support for 24 V AC/DC up to 240 V AC/DC, the REDMAX-15-SF1 simplifies integration across diverse system architectures and power infrastructure. Typical power consumption ranges from 10 to 90 W, ensuring efficient energy use. Under overload conditions, the actuator provides 100% overload protection to guard internal components and connected devices.

Ease of installation and maintenance: The compact and lightweight design eases mounting, even in tight installations. It supports standard ISO flanges and includes mechanical position indication for visual confirmation. On-site calibration, auto-setup, and selectable speeds reduce commissioning time. Emergency manual override allows safe manual control during maintenance, and field access to internal mechanisms is simplified by a modular construction.

Reliability and diagnostics: The REDMAX-15-SF1 continuously monitors internal health (temperature, current, position) and supports fault logging. That enables predictive maintenance and early detection of potential issues. The durable internal mechanism and quality components deliver high mean time between failures, minimizing downtime and lowering life-cycle cost.

Typical Application Scenarios

The REDMAX-15-SF1 is ideally suited for environments demanding safe and reliable quarter-turn actuation under hazardous conditions. In HVAC systems within petrochemical plants, refineries, or offshore platforms, it actuates air dampers, fire and smoke dampers, and volume control dampers—offering precise airflow regulation and fail-safe closure in power-loss scenarios. Its explosion-proof design ensures compliance in Zone 2 and Zone 22 areas.

In process industries, REDMAX-15-SF1 may drive quarter-turn valves—such as ball valves, butterfly valves, or throttling valves—in gas, dust, or corrosive atmospheres. The spring return ensures valves revert to a safe position during control failures, helping protect downstream equipment and process integrity. Integration with instrumentation and control systems allows remote monitoring and automated control.

In power generation or utility plants, this actuator handles ventilation dampers, isolation valves, or flue gas control systems where both operational control and safety fallback are essential. Because it supports a broad AC/DC voltage range, it fits easily into power systems across different voltage domains. The diagnostic features and modular construction simplify maintenance in industrial settings where downtime is costly.

In marine or offshore installations, the REDMAX-15-SF1 performs reliably even under corrosive and humid conditions, especially when specified with stainless steel or corrosion-resistant coatings. Its high ingress protection rating and explosion certification make it suitable for bulkheads, ventilation systems, or safety-critical dampers in ships or platforms.

Overall, whenever quarter-turn actuation is needed in hazardous or safety-critical plants—while requiring fail-safe behavior, precise control, and robust construction—the Schischek REDMAX-15-SF1 provides a compelling, high-integrity solution.

Related Model Recommendations

• REDMAX-15-F1: Similar to REDMAX-15-SF1 but without spring-return (non-fail-safe) version for applications where fail-safe is not required.

• REDMAX-8-SF1: 8 Nm version with spring return; suitable where lower torque is sufficient and weight or footprint must be minimized.

• REDMAX-15-BF1: Explosion-proof variant with “Ex-Pro” connector style suited for specific field wiring preferences in hazardous locations.

• REDMAX-15-YF1: A version supporting proportional (analog) control (0–10 V / 4–20 mA) in addition to on/off logic, with fail-safe mode.

• REDMAX-50-SF3: Higher torque variant (50 Nm) in the same family, for use in larger valves or dampers; shares many design features for ease of parts commonality.

• EXMAX-15-SF: A more severe-duty actuator in the Schischek explosion-proof series; suited for more extreme ambient or environmental conditions while interoperable with control logic.

Installation, Commissioning and Maintenance Instructions

Installation preparation: Before installing the REDMAX-15-SF1, confirm that the installation site meets temperature, humidity, and vibration specifications. Ensure all electrical power is locked out, and grounding is in place. Use appropriate tools and ESD precautions. Inspect mounting flanges, actuator housing, and installation surfaces to ensure alignment and cleanliness. Verify that cables, conduit entries, and sealing glands match the explosion-proof zone requirements.

Commissioning: Mount REDMAX-15-SF1 onto standard ISO flange or specified valve/damper interface, ensuring correct alignment to prevent shaft misalignment or mechanical stress. Tighten fasteners to specified torque values. Connect power supply (24–240 V AC/DC) and wiring for control inputs and auxiliary switches, observing polarity and shielding. Upon energizing, the actuator performs an internal calibration or auto-setup: confirm direction, limit positions, and running time settings. Adjust the runtime selection as needed. Operate through the full 95° travel to verify smooth motion, correct direction, and fail-safe spring return behavior. Verify auxiliary switch actuation at ~5° and ~85° positions. Monitor for any unusual noise, current draw, or temperature rise during initial cycles.

Maintenance suggestions: Periodically inspect the REDMAX-15-SF1 housing and fasteners for corrosion or mechanical damage. Clean external surfaces and ensure sealing covers remain intact. Review actuator event logs or fault indicators to detect trends in current, temperature or travel anomalies. Test spring-return function periodically (e.g. during planned shutdown) to confirm reliability. If internal lubrication is required per manufacturer schedule, use specified lubricants and follow safe disassembly practices. Replace auxiliary switches or internal seals after extended service intervals or if feedback becomes unreliable. Keep a calibrated spare actuator (or spare parts) on hand for rapid replacement to minimize downtime.

Service and Guarantee Commitment

The REDMAX-15-SF1 is manufactured to rigorous quality standards, with factory certification and full traceability to ensure performance and compliance under hazardous area regulations. We provide a warranty covering defects in materials and workmanship under normal operation.

Our after-sales support includes technical consultation, commissioning assistance, parameter setting guidance, diagnostic support, and spare parts supply throughout the product lifecycle. Should a REDMAX-15-SF1 actuator require repair or replacement, we commit to rapid turnaround and assistance to restore operations swiftly.

We emphasize reliability and customer confidence—our goal is to partner in your system’s uptime. We stand behind the integrity of Schischek REDMAX-15-SF1, offering sustained support, lifecycle care, and a service commitment that ensures your actuator continues to perform optimally in the most demanding industrial environments.

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