ST DD421N2-D1T Pizzato ST D series safety sensor

Why Choose the Pizzato ST DD421N2-D1T Safety Sensor?

The Pizzato ST DD421N2-D1T is a compact and robust RFID non-contact safety sensor with coded actuator designed for monitoring guards, doors, covers and other movable protective devices on industrial machinery. As part of the Pizzato ST D series safety sensors, it uses RFID technology and semiconductor safety outputs to provide dependable guard-position monitoring without mechanical contact between the sensor and actuator.

The ST D series is engineered for high-performance machine safety applications and can support safety architectures up to PL e and Category 4 according to EN ISO 13849-1 and SIL 3. Two safety inputs and two safety outputs allow the sensor to be integrated with compatible Pizzato safety devices, including series-connected installations where multiple guards need to be monitored.

The ST DD421N2-D1T operates from an industrial DC supply and features an integrated 2 m cable. Its D-format RFID actuator provides a 12 mm switch-on distance, while the robust sensor construction offers IP67 and IP69K protection for reliable use in demanding industrial environments.

Key Advantages

• Non-contact RFID safety sensing technology eliminates mechanical actuator wear.
• Digitally coded actuator helps provide protection against manipulation of machine safety guards.
• Two safety inputs and two semiconductor safety outputs support flexible machine safety architectures.
• Supports safety systems up to PL e, Category 4 and SIL 3.
• 12 mm switch-on distance provides practical tolerance for guard alignment.
• Multiple compatible ST D sensors can be connected in series while maintaining a high safety level.
• IP67 and IP69K protection supports installation in demanding industrial environments.
• Integrated 2 m cable simplifies machine wiring and installation.

Key Features

• Pizzato ST D series RFID safety sensor.
• Non-contact RFID-coded guard detection.
• Two safety inputs for safety circuit integration.
• Two semiconductor safety outputs.
• 12 mm switch-on distance.
• 14 mm switch-off distance.
• Integrated 2 m cable connection.
• Four LEDs for sensor status indication.
• Redundant electronic architecture for high-level functional safety applications.
• Series connection capability with compatible Pizzato safety devices.
• IP67 and IP69K environmental protection.
• Designed for applications with frequent operating cycles and demanding environmental conditions.

Reliable Non-Contact Guard Monitoring for Industrial Automation

RFID safety sensors such as the Pizzato ST DD421N2-D1T monitor the position of movable machine guards without requiring physical contact between the sensor and actuator. The coded actuator is detected electronically when it enters the sensor's operating zone, allowing the safety outputs to communicate the guard status to the associated safety controller or machine safety circuit.

The ST D series is particularly suited to automated machinery where guards are opened frequently or where vibration, contamination and normal mechanical tolerances can make traditional contact-operated switches less desirable. Redundant electronics, coded RFID detection and series-connection capability allow the ST DD421N2-D1T to form part of high-integrity machine safety systems while reducing mechanical wear and simplifying the monitoring of multiple guards.

Typical Applications

• Machine guard and access door monitoring.
• Industrial automation and robotic cells.
• Packaging and processing machinery.
• Conveyor and material handling systems.
• Machine tools and automated manufacturing equipment.
• Production lines with frequently operated safety guards.
• Multi-guard safety circuits using series-connected sensors.
• OEM machinery and integrated functional safety systems.