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Water Speed Indicators
Operation:
Beede Electrical Instruments water speed indicators are pitot-tube type speedometers that operate from air pressure that is forced into the speedometer head by water entering the pitot tube and tubing. As boat speed increases, more water is forced into the pitot tube and tubing, compressing the air and causing the Bourdon tube mechanism to register the boat speed. Beede water speed indicators are calibrated at the factory to tight tolerances. Maximum tolerance allowed is -1/+2 MPH.
Troubleshooting:
99% of all water speed indicator symptoms are: speedometer does not register or is reading too low. The first step in effective troubleshooting is the visual inspection. Check the back of the speedometer to see if the tubing is secured to the hose barb on the speedometer and is not leaking water. If it is loose blow the water out of the tubing and secure the tubing to the hose barb using a zip-tie. Check for kinks or pinches in the tubing that would restrict the air flow to the speedometer head. Check for debris in the pitot tube opening and tubing.
Note: the speedometer head can be bench tested by blowing compressed air into it. 20 PSI will cause the pointer to deflect to roughly 38 MPH.
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