Hot wire anemometer with interchangeable head and top accuracy
The technological excellence of the hot wire anemometer
LSI LASTEM stands out in the environmental monitoring sector thanks to its cutting-edge technologies, among which the hot wire anemometer stands out. This technical pill explores the features and benefits of this model, focusing on its distinctive technology and the benefits it offers to those who use it.
Unlike other sensors that use thermistors or hot spheres, the LSI LASTEM hot wire anemometer uses a 10 µm tungsten wire as the sensing element. This technological choice offers numerous advantages, including a fast response and increased accuracy compliant with the rigorous ISO 7726 standard. In fact, the hot wire has a very low thermal inertia, allowing a response time of only 0.01 s, which is essential for calculating turbulence and properly monitoring changes in air velocity.
Autonomous replacement of the measuring head: a big advantage
One of the strengths of LSI LASTEM’s of hot wire anemometers is the possibility of independently replacing the head, a particularly valuable feature given the high fragility of the tungsten wire. This feature not only reduces the costs and time associated with maintenance, but also ensures continuous operation of the appliance without having to send it to the factory for replacement.
The improvement of accuracies
The modification of the sensor’s production methodology has also allowed a significant improvement in the declared accuracies, which fully comply with the accuracies necessarily required by the ISO 77226 standard.
Below are the values for the different measurement ranges:
- NA (0…0.1);
- ±0.06 m/s (0.1…0.4 m/s);
- ±0.08 m/s (0.4…3.0 m/s);
- ±0.035 * VM (3.0…20 m/s).
Optimal performance in any environment
The extremely wide measurement range, ranging from 0.01 to 20 m/s, makes the LSI LASTEM hot wire anemometer suitable for a wide range of applications, including those related to environmental comfort and thermal stress. The sensitivity of the tungsten wire to air currents coming from different directions (up to 300° in the plane perpendicular to the wire) ensures accurate and complete detection of environmental conditions, guaranteeing optimal performance in any environment.
The true hot wire anemometer
Despite the widespread use of other technologies, the hot wire anemometer remains the most advanced and reliable solution for measuring indoor air speed. It is important to point out that many products on the market are improperly labelled as “hot wire”, when in reality they use lower performing sensors such as thermistors or hot spheres. Laboratory tests have shown that these alternative sensors have significant limitations in terms of directional response and thermal inertia, compromising the accuracy and reliability of measurements.
The revolution in radio communication: the EXP126
LSI LASTEM is one of the few companies to offer a true hot-wire anemometer with radio communication: the EXP126. This innovative technology eliminates the need for wiring, making it particularly useful in critical environments, such as places frequented by people or sites of historical and artistic significance, where cable installation could be problematic.
The radio sensor can also be integrated with the Sphensor family, as it is able to communicate via radio with the Sphensor Gateway. In this way, the collected data can be viewed directly on the INDOOR CUBE platform, ensuring precise and real-time monitoring of environmental conditions.
Conclusion
In conclusion, the LSI LASTEM hot wire anemometer, with its combination of top accuracy, reliability and versatility, is confirmed as the ideal choice for the most demanding applications in terms of air speed measurement.