Volume flow controllers for hazardous areas (ATEX & IECEx) and industrial applications from pi safety
- ATEX certified and versatile
- Maximum safety in hazardous and industrial environments
- Time-saving plug-and-play solution
- Maintenance-free and durable – Made in Germany
Reliable control technology from pi safety for potentially explosive areas and industrial plants
The volume flow controllers from pi safety are designed for precise and safe use in industrial and potentially explosive areas. They enable continuous, electronically controlled regulation of air, gas, or liquid volume flows in critical applications. Thanks to state-of-the-art technology, robust construction, and flexible interfaces, the controllers can be easily integrated into existing systems. Benefit from maximum safety, maintenance-free operation, and a durable design – developed for the highest requirements in hazardous areas and industrial environments.
Volume flow controllers for applications in hazardous areas (ATEX & IECEx)
The volume flow controllers from pi safety offer real practical advantages: They are compact, flexible, reliable, and ready for immediate use – perfect for safe use in Ex zones where maximum safety and easy integration are essential.
AC.Ex, Volume Flow Controller, 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 - in zone 1 / 2 / 21 / 22
- Ambient temperature -40…+58°C
- IP66
- Temperature class T4 for all gases and dusts
- Adjustable on site
- Integrated, lighted display for measured value indication
- Stainless steel / polymer compound material for maximum corrosion resistance
QT.Ex and IY.Ex
Specification:
- Feedback: 0...10 V oder 4...20 mA
- No further barrier required in the control cabinet
- LED status indication
- 24 VAC / DC
- For use with IY.Ex-Sensors
- Setpoint specification: 0...10 V oder 4...20mA
- Low power consumption < 3 W
- Measured value recording in zone 0
- Cable length from transmitter to sensor up to 100 m
- Integrated Ex e terminal box
- Alarm contact potential-loaded
8 advantages of pi safety volume flow controllers for hazardous areas
Full Ex zone coverage (1, 2, 21, 22)
Approved for gas and dust atmospheres – including measurement capability up to Zone 0 thanks to suitable sensor technology and encapsulated design
Simple on-site configuration via display without PC or software
All settings directly on the device – intuitive operation via push-buttons and menu navigation, ideal for commissioning in hard-to-reach installations
Two analog output signals as standard (4–20 mA or 0–10 V)
Simultaneous signal availability for PLC, BMS or control systems – reduces the need for signal converters and saves space in the control cabinet
Corrosion-resistant thanks to robust IP66 stainless steel-polymer housing
Resistant to moisture, aggressive media and cleaning processes – ideal for use in the food, pharmaceutical or chemical industries
Operating temperature range from –40 °C to +70 °C for almost all outdoor areas
Reliable operation in frost-prone zones, technical air handling units or tropical climates – without the need for additional heating elements
Compact design & M12 plug-in connection "plug-and-play"
Quick and error-free installation without complex wiring – reduces installation time and simplifies replacement during maintenance
Direct support, consulting, and development from Germany
Competent contact persons assist with product selection, system integration and project-specific adjustments – no detours via distributor chains or ticket system
Short delivery times – fast worldwide availability
In-house production and standardized product lines ensure short lead times – ideal for projects with tight schedules or urgent replacement needs
Areas of application for potentially explosive atmospheres (Ex zones):
Chemical industry
Controlled gas, steam, or air flows in potentially explosive production areas
Pharmaceutical manufacturing
Supply air and exhaust air control in clean rooms with potentially explosive vapors
Oil and gas industry (onshore/offshore)
Control of process air and gas supply systems in Zone 1/2
Painting and coating systems
Air volume control for emission control in ATEX-classified areas
Recycling & waste technology
Extraction and conveyor systems with a risk of flammable gases or dusts
Tank farms & hazardous goods handling
Air or inert gas control during filling, degassing, or emptying
Volume flow controllers
from pi safety for industrial applications
AC.Nc, Volume Flow Controller
- Ambient temperature -40…+58°C
- IP66
- Adjustable on site
- Integrated, lighted display for measured value indication
- Highest corrosion resistance
- Feedback: 0...10 V oder 4...20 mA
QT.Nc and IY.Nc
- LED status indication
- 24 VAC / DC
- For use with IY.Ex-Sensors
- Setpoint specification: 0...10 V oder 4...20 mA
- Low power consumption < 3 W
- Cable length from transmitter to sensor up to 100 m
- Integrated Ex e terminal box
Advantages of volume flow controllers for industrial applications
Universally applicable for air, gas, and process air
Flexible in application – not limited to HVAC or special systems
Two analog signals as standard (4–20 mA & 0–10 V)
Full compatibility with PLC, DDC, and control systems – no special configuration required
Compact design with IP66 housing
Ideal for harsh industrial environments, mechanical engineering, and technical rooms
Easy commissioning via integrated display
No software tool, no training – quick parameterization directly on the device
Wide temperature range: –40°C to +70°C
Also works reliably in outdoor areas, containers, or production halls
Robust, low-maintenance design
Long-term use with minimal effort – ideal for 24/7 operation
Direct contact person at pi safety
Technical clarification without detours – fast implementation of customer requirements
Areas of application for industrial use
HVAC and building technology:
Volume flow control in ventilation, heating, and air conditioning systems in large industrial plants
Mechanical and plant engineering
Control and monitoring of air and gas flows in manufacturing and automation systems
Energy and power plant technology
Control of cooling air, exhaust gas, or fresh air flows in power generation plants
Process industry
Flow control of media in industrial mixing, reaction, or drying processes
Water and wastewater technology
Air control for ventilation, filtration, or odor neutralization
Food and packaging industry
Volume flow monitoring in packaging systems, refrigeration systems, or production lines
Cleanroom technology/production
Air volume control to ensure constant cleanroom conditions
FAQ about volume flow controllers
For zones 1, 2 (gas) and 21, 22 (dust) – certified to ATEX, IECEx as standard.
Directly via an integrated display – without a laptop, software, or opening the housing.
4–20 mA and 0–10 V are available as standard – no special version required.
IP66 – dustproof, jet-proof, ideal for harsh Ex environments.
SSPC (stainless steel polymer compound) – corrosion-resistant, chemical-resistant, durable.
From –40°C to +70°C.
Yes, via PLC/control systems – compatible via analog signal.
4–20 mA and 0–10 V are both integrated ex works – ready for connection to common control systems.
Plug-and-play capable via M12 connector or terminal connection – mount, connect, and you're done! Ready for immediate use.
Designed for long-term 24/7 continuous operation, low maintenance, mechanically robust.