Graco 24U851 Low Pressure TransducerThe Graco 24U851 Low Pressure Transducer monitors material supply pressure entering the Reactor proportioner. A failed sensor can cause inaccurate pressure readings, fault codes, startup issues, and pressure-related shutdowns.Common symptoms include:Pressure readings stuck at zeroErratic pressure readingsLow pressure fault codesReactor startup issuesMaterial supply pressure alarmsBefore replacing the sensor, inspect all wiring connections, connectors, and harnesses for damage or corrosion.Compatible with select Graco Reactor proportioners.