Features of the Transmitter : Air Velocity - Working Principle : the air velocity measurement is made with a hotwire, in constant thermal equilibrium. The temperature is maintained and measured with a PT 100 element. Measuring Range : 0 to 5m/s, 0 to 10m/s, 0 to 15m/s, 0 to 20m/s, 0 to 30m/s Units of measurement : m/s and fpm Accuracy* : +3% of reading +0.3 m/s Response time : 1/e (63%) 2 s