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The iGRAIN Relay Output Unit is a control module designed for automatic control of aeration and head space ventilation fans. The unit is controlled from the iGRAIN Dashboard Manager or control board via RS485 MODBUS. Each unit has 8 relays with NO (Normally Open) and NC (Normally Closed) relay contacts and the status of each relay is indicated with a diode. Each relay unit can be set to an individual address and be installed remotely where the aeration power relays are located. The unit is normally only used for aeration control if there is no PLC/SCADA system available. Advantages • Status and control by iGRAIN Dashboard Manager • Easy control board mount • Operates in either manual or automatic mode via the aeration control software

The iGRAIN Plenum Pressure Sensor confirms that the aeration control takes place at the right time. Situated in the silo plenum space or in the transition box from the aeration fan, the pressure sensor confirms that the aeration fan is running; this is necessary because when the iGRAIN dashboard software determines that the fans should run, then an alarm will be triggered if it does not happen. And vise versa, if the fan is running when the software has calculated it is not advantageous, then another alarm will be triggered. The pressure sensors are connected to the iGRAIN AIO-Hub. A CAT6 cable can be used for both power and the MODBUS data communication. The AIO-Hub can be connected to other sensors in the AIO family since they share the 24 VDC and the universal MODBUS communication protocol.