The HW‑group AirFlow Sensor 5101 is a high‑precision calorimetric airflow sensor designed to reliably detect airflows above or below an adjustable threshold within the range of 1 to 10 m/s (100–1000 cm/s). With its durable construction (IP65 protection) and titanium sensor surface, it is ideal for use in server rooms, HVAC systems, and industrial ventilation setups.

Precise and Adjustable Airflow Detection

The calorimetric measurement principle ensures accurate detection of air movement, unaffected by dust particles or air humidity. The threshold can be individually adjusted using a potentiometer, with optimal sensitivity in the range of 100 to 400 cm/s. This allows the AirFlow Sensor to be precisely adapted for a variety of applications – from ventilation monitoring to wind detection.

Relay Output for Easy System Integration

The integrated normally open (NO) relay contact (3 A at 30 V DC or 250 V AC) closes when the set threshold value is reached or exceeded. This allows the sensor to be directly connected to HW‑group devices such as Poseidon2, Ares, STE2, or Damocles via digital inputs (dry contact). In this configuration, airflow changes can be monitored and transmitted in real‑time through LAN, GSM, or SNMP.

Robust and Long‑Lasting Design

The PBT (Pocan) housing and titanium sensor surface provide high resistance to environmental influences, ensuring long‑term performance. With its IP65 protection rating, the sensor is dust‑tight and resistant to water jets, making it well suited for demanding industrial conditions or humid cooling zones.

Typical Application Areas

• Server rooms & data centers: Monitoring airflow to prevent overheating.
• HVAC monitoring: Controlling ventilation performance for energy‑efficient climate systems.
• Industrial environments: Ensuring optimal conditions in production lines or laboratory setups.
• Remote monitoring: Integration into networked systems that trigger automatic alerts when airflow changes occur.
• Wind detection: Application in building management or automation systems.

Technical Specifications

• Measurement method: Calorimetric
• Measurement range: 1 – 10 m/s (100–1000 cm/s)
• Threshold: Adjustable via potentiometer
• Output: NO relay contact (3 A at 30 V DC / 250 V AC)
• Sensitivity range: Optimal at 100–400 cm/s
• Startup delay: 60 seconds
• Response time: 3 – 60 seconds
• Power supply: 24 V DC ± 25 %, 1 VA
• Operating temperature: –10 °C to +50 °C
• Relative humidity: Max. 90 % (non‑condensing)
• Protection rating: IP65
• Material: PBT housing (Pocan), titanium sensing surface
• Dimensions: 140 mm length, 23 mm diameter
• Cable: 2 m PUR cable
• Connection: Digital inputs (dry contact) for Poseidon2, Ares, or STE2

Easy Installation

The AirFlow Sensor comes with a mounting bracket that allows quick and secure installation on ducts, racks, or walls. The threshold can be precisely adjusted via the potentiometer to meet specific requirements. Two LED indicators provide visual feedback for operating (green) and alarm (red) states.

Integration and Data Evaluation

When connected to HW‑group monitoring devices, airflow signals from the sensor can be integrated into central supervision platforms. Integration with Poseidon2 or Ares systems provides real‑time status reports, e‑mail or SMS alerts, and compatibility with SNMP‑based management tools. The SensDesk cloud portal enables centralized visualization and management, including mobile access via iOS and Android apps.

The HW‑group AirFlow Sensor 5101 stands out for its precision, durability, and versatility. It is the ideal solution for operators who need reliable airflow monitoring and immediate response to deviations—whether in data centers, building management, or industrial environments.