The step transformer controller have the special characteristic that the ventilators make no noise "hum" in the lower rotation. The step transformer control the fan speed from self 6-step up/down according the humidity and temperature. Temperature and hysteresis (sensitivity) can be set on two knob's as well humidity and humidity-hysteresis on the other two knobs.

The controller comes as a finished part and is ready to use. This reliable fan controller comes complete with a sealed water resistant cover, plugs with flap-lids and a low voltage sensor making it perfect for humid rooms. The sensor comes with a 4meter long cable.

Sizes and technical data's:
Case: WxHxD = 200x250x180mm
Controller: WxHxD = 265x300x205mm
Designed for: 8A
Volts prim: 230V / 50HZ
Volts sec. 80V, 110V, 140V, 170V, 200V, 230V automatic-steps 50HZ
Digital sensor 5V Measures temperatures from -55°C to +125°C (-67°F to +257°F)
0.5°C accuracy from -10°C to +85°C
humidity accuracy ±4.5%rh
Protection class IP54

Settings range:
Temperature: 20C° - 30C°
Temperature hysteresis: 2-8C°
Humidity: 30% - 100%
Humidity hysteresis: 6%-30%