This is a differential pressure controller with two setpoints. It controls differential pressure or air volume flow. The analogue output can directly control EC fans, frequency inverters or AC fan speed controllers. The requested differential pressure is kept constant, regardless of the demand. The output type can be selected: 0-10 VDC / 0-20 mA / 0-100 % PWM. One of both setpoints can be activated via the dry contact input. This makes it possible to distinguish a day and night regime for example. Both setpoints and all other settings can be adjusted via Modbus RTU. The supply voltage is 24 VDC. It can be used in the range of 0 to 2.000 Pa.