Sensors that used to measure temperature for Fluid Bed are PT100. The PT100 sensor is a kind of resistance temperature detector (RTD). Linear resistance in our mention is between 100 Ohm at 0oC to 200 Ohm at 270 oC. At the room temperature about 25 oC, Its resistance should be around 109.3 Ohm. After power OFF, Disconnect wires at PT 100’s terminal and measure its resistance.