Test the transducer - Speed through water

Testing a Speed Sensor Through Water

The following procedure can be used to test a speed sensor through water:

• Ensure that the sensor's paddle wheel is free from marine growth and rotates freely on its axle.
• Turn off the instrument or iTC-5.
• Disconnect the GREEN and SHIELD sensor cables from the instrument display or instrument pod.
• Connect a multimeter to the GREEN and SHIELD sensor cables and configure the multimeter to measure continuity or resistance.
• Slowly rotate the sensor's paddle wheel by hand. Note that as the paddle wheel rotates, the multimeter should switch between an open circuit and a closed circuit at each quarter turn. Therefore, a full rotation of the paddle wheel should open and close the circuit four times.

If the multimeter responds as indicated above, the speed sensor element in the sensor is considered functional. If not, the sensor has failed and should be replaced.