You must wait for the complete adhesion to go to the following step. Connection of the relay, the recorder and pump Connect in parallel the output of the sensor box to the detect relay and the recorder. The range of the recorder should be 5 or 10 volts full scale. Pay attention to the polarity. Note that black and red mean negative and positive, respectively.
Preparations Put a tube to the inlet.
It is convenient to fix the heater with some thin silicon tubes. Connect the AC adaptor to the sensor box to heat up the sensor. The property of the sensor will drift in the first two or three days until the oxidized surface of the sensor is stabilized. So you should NOT turn off the power supply for sensor box even after you finish the fermentation. Place the sensor box above the fermentor using a suitable holder.