Reliable switching technology for hazardous areas and industrial plants
The switching amplifiers with relay output from pi safety are designed for use in demanding industrial environments and potentially explosive areas. They offer reliable signal processing and transmission, are ATEX and IECEx certified, and can be easily integrated into existing systems. With their robust design and high compatibility, they are the ideal solution for a wide range of applications.
Switching amplifiers with relay output
for applications in hazardous areas (Ex zones)
SW.Ex Switching relais, explosion protected
Product specifications
Specification:
- II2(1)G Ex eb mb ib [ia Ga] IIC T4 Gb
II2(1)D Ex tb ib [ia Da] IIIC T130°C Db - Universal Transducer for mounting in zone 1 / 2 / 21 / 22
- Two adjustable, potential free relay outputs
- Ambient temperature -40…+70°C
- IP66
- Temperature class T4 for all gases and dusts
- Adjustable hysterisis
- Adjustable on site; display
- Stainless steel / polymer compound material for maximum corrosion resistance
- No further barrier required in the control cabinet
- LED status indication
- Smart installation
- 24 VAC / DC
- For use with IY.Ex-Sensors

IR.Ex Sensors
Specification:
- II 1/2G Ex ia IIC T6/T5/T4 Ga/Gb
II 2D Ex ia IIIC T75°C-T145°C Db - Intelligent sensor concept for connection (M12 connector) to SW.Ex universal Ex-transducer
- Stainless steel / polymer compound material for maximum corrosion resistance
- Room sensor for direct connection
- For measuring in zone 0, 1, 2, 21, 22
- Other sensors with M12 sensor cable (1 meter included, other lengths available)
- For use with SW.Ex Transducer
6 advantages of pi safety switching amplifiers with relay output for Ex zones
Fully ATEX & IECEx certified for zones 1, 2, 21, 22 and measurement acquisition up to zone 0
No special approvals or restrictions required for dust zones
Direct on-site parameterization via button or display
No configuration tool or software required
Compact design with IP66 housing
Easy to install, robust, and suitable for harsh environments
Wide temperature range (–40°C to +70°C)
For flexible use indoors and outdoors
Installation without additional barrier (Zener barrier, Ex barrier)
Saves space and reduces installation effort
Fast support directly from pi safety
Technical queries and advice without ticket system or sales channels
Areas of application for Ex areas (ATEX zones):
Chemical and petrochemical plants
Pressure and temperature monitoring in safety-relevant processes
Pharmaceutical industry
Clean room sensor technology for monitoring process parameters under Ex conditions
Oil & gas production (onshore/offshore)
Monitoring of pipeline pressure, temperature or humidity
Paint, varnish, and solvent processing
Explosion-proof measurement transmission in sensitive mixing areas
Energy & power plant technology
Volume flow and temperature measurement for combustible media
Food industry with Ex areas
Volume flow and temperature measurement for combustible media
SW.Nc Switching Relais
IR.Nc Sensoren
- Intelligent sensor concept for connection (M12 connector) to SW.Nc universal switching relay
- Highest corrosion resistance
- Room sensor for direct connection
- Other sensors for M12 sensor cable (1 meter included, other lengths available)
- For use with SW.Nc universal switching relay
Advantages of pi safety switching amplifiers with relay output for industrial applications
Reliable signal processing:
clean separation and transmission of control signals
Robust & durable:
resistant to dust, moisture, and vibration (IP66)
Compact design:
space-saving for control cabinets, machines, and systems
Flexible application options:
ideal for mechanical engineering, HVAC, building technology, and much more
Easy integration:
compatible with common control systems and PLCs
Easy to maintain:
solid relay technology for long-term, trouble-free operation
Made in Germany:
durable components and reliable function
Direct support from pi safety:
support, advice, and customization without detours
Short delivery times:
our products are quickly available worldwide
Areas of application for industrial use
Mechanical and plant engineering
Real-time monitoring of pressure, temperature, humidity, or volume flow
Water & wastewater technology
Sensors for fill levels, media monitoring, and flow control
Building technology & HVAC systems
Integration for controlling heating, cooling, and ventilation systems
Automation technology & robotics
Continuous feedback of position and movement data
Food and packaging industry
Process control for temperature, pressure, or humidity
Renewable energies & environmental technology
Measurement data acquisition in solar, wind power, or biogas plants
FAQ about switching amplifiers with relay output
A switching amplifier with relay output receives an electrical control signal (e.g. from a sensor or a control system) and uses it to switch a relay – e.g. to control machines, alarms or valves.
Yes – the SW.Ex series switching amplifiers are ATEX and IECEx certified and approved for use in zones 1, 2, 21, and 22. Channel sensors can also be operated in zone 0.
The devices are ready to connect with plug-and-play terminal connections and M12 connectors and can be integrated directly into control cabinets.
Yes – the pi safety models are designed for continuous switching cycles, are low-maintenance, and are designed for 24/7 industrial operation.
All pi safety sensor switching amplifiers with relay output are IP66-protected – i.e., dustproof and sealed against strong water jets.
The Ex switching amplifier meets additional safety requirements (e.g., housing pressure resistance, temperature resistance, type of ignition protection) and is certified for use in potentially explosive areas. Industrial devices are optimized for non-explosive zones.
pi safety uses high-quality industrial components and relays with a long mechanical service life. The stainless steel/polymer compound housing is corrosion-resistant, halogen-free, and silicone-free. The devices are “Made in Germany,” maintenance-free, and designed for continuous industrial operation.
Installation is simple and can be done directly on site. Intuitive operation and plug-and-play functionality make commissioning easy.
All relevant certificates (ATEX, IECEx) and technical documentation can be downloaded from the website.