ST HE420N5 Pizzato ST H series safety sensor

Why Choose the Pizzato ST HE420N5 ST H Series Safety Sensor?

The Pizzato ST HE420N5 is a robust RFID electronic safety sensor designed for reliable non-contact monitoring of guards, doors and access points on industrial machinery. Part of the advanced Pizzato ST H RFID Safety Sensor Series, it combines RFID detection technology with electronic safety inputs and outputs for dependable integration into modern machine safety and industrial automation systems.

Operating from a 24 V DC supply, the ST HE420N5 provides two safety inputs IS1–IS2, two safety outputs OS1–OS2, one signalling output O3 and one programming input I3. This flexible I/O configuration enables straightforward connection to compatible safety modules and safety PLCs and supports series-connected safety architectures where multiple guarded access points need to be monitored.

The ST HE420N5 is supplied with an integrated 5 m cable and uses the symmetrical ST H housing with 78 mm mounting hole spacing. With multicolour signalling LEDs, multitag programming and IP67 / IP69K protection, the sensor platform is well suited to demanding industrial environments where reliable machine guarding and straightforward diagnostics are required.

Key Advantages

• Advanced RFID non-contact safety monitoring for industrial machine guards.
• Non-contact operation reduces mechanical wear compared with conventional electromechanical safety switches.
• 24 V DC operation suits modern industrial safety and automation systems.
• Two safety inputs and two safety outputs support flexible series-connected safety architectures.
• Dedicated signalling output provides useful guard status information to machine control systems.
• Multicolour signalling LEDs provide clear visual indication of sensor operating status.
• Symmetrical housing allows convenient installation on both left- and right-hand guards.
• 78 mm mounting hole spacing facilitates replacement of traditional Pizzato SR B series magnetic sensors.
• IP67 / IP69K protection supports use in demanding industrial environments.

Key Features

• Pizzato ST H RFID Safety Sensor Series.
• 24 V DC supply voltage.
• 2 safety inputs IS1–IS2.
• 2 safety outputs OS1–OS2.
• 1 signalling output O3.
• 1 programming input I3.
• RFID-based non-contact actuator recognition.
• Integrated 5 m cable.
• Symmetrical ST H series housing.
• 78 mm mounting hole spacing.
• Multicolour signalling LEDs visible from both sides of the housing.
• Multitag programming functionality.
• Compatible with ST series RFID actuators.
• IP67 according to EN 60529 and IP69K according to ISO 20653.
• Standard operating temperature range from -25 °C to +70 °C.

Reliable Safety Monitoring for Industrial Automation

RFID safety sensors such as the Pizzato ST HE420N5 monitor the position of machine guards using electronic actuator recognition rather than mechanically operated contacts. This non-contact principle reduces mechanical wear and provides dependable guard monitoring across the repeated opening and closing cycles encountered in automated production machinery.

Pizzato ST series sensors can be integrated with compatible safety modules or safety PLCs with OSSD inputs, while multiple sensors can be connected in series to simplify machine safety wiring. The dedicated signalling output can provide guard status information to the machine control system, while multicolour LEDs make operating conditions easier to identify directly at the sensor.

Typical Applications

• Industrial machine guard monitoring.
• Safety doors and movable access panels.
• Robotic cells and automated production systems.
• Packaging and processing machinery.
• Conveyor and material handling equipment.
• Assembly plants and machining centres.
• OEM machine building and industrial safety systems.