Accurate air velocity measurement is a critical requirement across modern industrial environments. From HVAC systems and clean room ventilation to industrial ventilation and advanced manufacturing processes, reliable airflow data ensures safety, efficiency, and regulatory compliance. As processes become more complex and tolerances tighter, traditional air velocity probes and gas velocity transmitters often struggle to deliver consistent results under harsh operating conditions.
AVS 701 Air and Gas Velocity Sensor
The AVS 701 air and gas velocity sensor from E+E Elektronik has been developed specifically to address these challenges. Designed for demanding industrial applications, the AVS 701 sets a new standard for air velocity transmitters and gas velocity measurement, combining high accuracy, long-term reliability, and intelligent design features that significantly reduce commissioning time and lifecycle costs.
A New Standard in Air and Gas Velocity Measurement
The AVS 701 is a highly accurate air velocity probe and gas velocity probe designed for continuous operation in environments where airflow precision directly impacts process quality and safety. With a measurement range of 0 to 40 m/s and a temperature range from -40 to +140 °C, the sensor is suitable for a wide variety of applications, from climate-controlled cleanrooms to high-temperature industrial exhaust systems.
Unlike conventional airflow sensors that are sensitive to contamination, misalignment, or pressure fluctuations, the AVS 701 combines advanced sensing technology with intelligent compensation mechanisms. This ensures stable, repeatable airflow and gas velocity data even in dynamic process conditions.
High-End Ceramic Sensing Element for Extreme Conditions
At the core of the AVS 701 is a thin-film ceramic sensing element, specifically engineered for industrial use. Ceramic technology offers excellent thermal stability, fast response times, and outstanding resistance to chemical exposure. The sensing element is protected by a stainless steel probe head and a specialised coating that shields it from moisture, corrosive gases, and aggressive cleaning agents. This robust design enables reliable gas velocity
measurement in environments where conventional sensors fail prematurely. Long term ammonia exposure tests highlight the difference: while standard sensors showed corrosion and electrical failure after approximately 440 hours, the AVS 701 remained fully functional beyond 1,000 hours. With a calculated mean-time-to-failure (MTTF) of 9,400 hours, the AVS 701 lasts up to 20 times longer than conventional solutions.
For end users, this translates into fewer sensor replacements, reduced downtime, and significantly lower maintenance costs. For OEMs, it offers a dependable airflow measurement component that enhances overall system reliability.
Faster Commissioning with Accurate Sensor Positioning
One of the most common sources of error in air velocity measurement is incorrect probe alignment. Even small deviations from the airflow direction can lead to inaccurate readings and extended commissioning times.
The AVS 701 addresses this challenge with an innovative alignment crimp and positioning tool integrated into the remote probe design. This allows installers to align the air velocity transmitter precisely with the flow direction during installation. As a result, setup times are reduced by up to 60%, and measurement accuracy is ensured from the first start-up.
This feature is particularly valuable in large HVAC installations, industrial ventilation ducts, and cleanroom supply air systems, where multiple sensors must be installed consistently and efficiently.
Automated Compensation for Reliable Airflow Data
In real operating environments, airflow is rarely stable. Temperature shifts and pressure changes can distort air and gas velocity readings, leading to inefficient ventilation control, increased energy consumption, or even safety risks if they are not properly compensated.
The AVS 701 eliminates this uncertainty by measuring both standardised flow and actual operating flow. Standardised flow provides a reliable, comparable reference for reporting and process optimisation, while operating flow delivers an accurate picture of the real airflow inside the system to ensure optimal ventilation control, safety, and compliance.
Built-in temperature measurement continuously corrects the velocity signal in real time, ensuring accuracy as conditions change. For applications where ambient pressure fluctuates, such as high-altitude sites or enclosed industrial processes, an optional external pressure sensor can be connected to the AVS 701 sensor control port (SCP). This enables automatic pressure compensation without manual adjustments.
By handling all corrections internally, the AVS 701 removes the need for time-consuming calculations, reduces commissioning effort, and ensures consistently accurate airflow and gas velocity measurement.
Intelligent Gas Adjustment for Process Flexibility
Many industrial processes involve more than just air. Applications such as combustion
control, additive manufacturing, and specialised ventilation systems often require accurate gas velocity measurement for gases like CO₂, Argon, or nitrogen.
The AVS 701 includes an integrated process gas library that automatically applies gas-specific corrections. Selecting the required gas via the control interface enables the sensor to adapt instantly to different process conditions.
This intelligent gas adjustment minimises configuration errors, reduces setup time, and ensures consistently high accuracy, making the AVS 701 an ideal gas velocity transmitter for flexible and evolving production environments.
Exceptional Accuracy for Sensitive Applications
With a measurement accuracy of ±1% of the measured value and as low as ±0.03 m/s in the range of 0–2 m/s, the AVS 701 delivers accuracy where it matters most – in applications such as:
- Clean room ventilation, where laminar airflow must be maintained for filter monitoring and to prevent contamination.
- Pharmaceutical production, where precise ventilation control supports product quality and regulatory compliance
- HVAC systems, where accurate airflow data improves energy efficiency and occupant comfort
Early detection of process deviations enables proactive maintenance and process optimisation, reducing scrap rates and preventing costly failures.
Optimised for HVAC, Cleanrooms, and Industrial Ventilation
The versatility of the AVS 701 makes it suitable for a wide range of ventilation control applications:
- Monitoring incoming and outgoing air in HVAC systems to optimise energy use
- Filter monitoring and laminar flow control in cleanrooms and laboratories
- Exhaust systems, fume hoods, and glove boxes in pharmaceutical, food, and semiconductor industries
- Industrial ventilation and air conveying systems
- Volumetric flow measurement for combustion control
- Wind tunnels and climate simulators
By providing reliable airflow and gas velocity data, the AVS 701 helps ensure safe operating conditions, consistent product quality, and compliance with industry standards.
Flexible Integration for OEMs and System Designers
The AVS 701 offers two analogue outputs, RS485, and USB-C for maximum integration flexibility. OEMs can easily integrate the compact, high-performance air velocity probe into custom designs, while end users benefit from efficient configuration and robust communication with existing control systems.
Calibration is performed in E+E Elektronik’s in-house laboratory to ensure traceable accuracy and long-term measurement reliability.
A Future-Proof Solution for Air and Gas Velocity Measurement
The AVS 701 air and gas velocity sensor combines precision engineering, intelligent features, and exceptional durability to meet the demands of modern industrial and HVAC applications. With faster commissioning, outstanding accuracy, and proven resistance to harsh environments, it delivers measurable improvements in efficiency, reliability, and total cost of ownership.
Whether used as an air velocity transmitter in HVAC systems, a gas velocity probe in industrial processes, or a critical component in clean room ventilation, the AVS 701 provides the dependable airflow measurement performance required for today’s most demanding applications, and tomorrow’s innovations.
