ST HE421N3-H1TF Pizzato ST H series safety sensor

Why Choose the Pizzato ST HE421N3-H1TF ST H Series Safety Sensor?

The Pizzato ST HE421N3-H1TF is a robust RFID electronic safety interlock sensor with magnetic holding designed for reliable non-contact monitoring of guards, doors and access points on industrial machinery. As part of the advanced Pizzato ST H RFID Safety Sensor Series, it combines high-level RFID actuator coding with redundant electronic safety technology for dependable integration into modern machine safety systems.

Operating from a 24 V DC supply, the ST HE421N3-H1TF provides two safety outputs OS1–OS2 and one signalling output O3. Its electronic architecture is designed for connection to compatible safety modules and safety PLCs, providing reliable guard position monitoring while avoiding the mechanical wear associated with conventional contact-based safety switches.

The ST HE421N3-H1TF uses a high-level coded RFID actuator and incorporates the permanent magnet characteristic of the ST H series, helping keep guards closed against vibration, recoil and air turbulence. The N3 configuration provides an integrated 3 m cable, while the robust technopolymer housing, 78 mm mounting hole spacing and high ingress protection make the sensor suitable for demanding industrial installations.

Key Advantages

• Reliable RFID non-contact safety interlocking for industrial machine guards.
• High-level coded RFID actuator provides enhanced protection against inappropriate substitute actuation.
• Integrated permanent magnet helps keep guards closed against vibration, recoil and air turbulence.
• Non-contact sensing minimises mechanical wear and maintenance requirements.
• Redundant electronic design supports high-performance machine safety applications.
• Integrated 3 m cable simplifies installation and machine wiring.
• Symmetrical housing allows convenient installation on left- or right-hand guards.
• 78 mm mounting hole spacing facilitates upgrades from traditional SR B series magnetic sensors.
• Robust construction supports operation in demanding industrial environments.

Key Features

• Pizzato ST H RFID Safety Sensor Series.
• 24 V DC supply voltage.
• 2 safety outputs OS1–OS2.
• 1 signalling output O3.
• RFID coded non-contact actuator detection.
• High actuator coding level.
• Permanent magnet incorporated into the ST H housing.
• Integrated 3 m cable.
• Symmetrical technopolymer housing.
• 78 mm mounting hole spacing.
• Designed for high-performance industrial machine safety systems.
• Suitable for connection to compatible safety modules and safety PLCs.
• ST H series protection suitable for demanding industrial environments.

Reliable Safety Monitoring for Industrial Automation

RFID safety sensors such as the Pizzato ST HE421N3-H1TF monitor the position of machine guards by electronically recognising a coded actuator without requiring mechanical contact between the sensor and actuator. This non-contact operating principle reduces mechanical wear while providing dependable guard monitoring across the repeated opening and closing cycles found in automated machinery.

The ST H series combines RFID safety monitoring with an integrated permanent magnet that helps maintain guard closure where vibration, recoil or air turbulence could otherwise cause unwanted movement. High-level actuator coding and redundant electronics make the series particularly suitable for machine builders requiring reliable safety performance and resistance to deliberate or accidental bypassing.

Typical Applications

• Industrial machine guard monitoring.
• Safety doors and movable access panels.
• Robotic cells and automated manufacturing systems.
• Packaging and processing machinery.
• Conveyor and material handling equipment.
• Guards exposed to vibration, recoil or air turbulence.
• OEM machine building and industrial safety systems.