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Old 28-09-2011, 11:09   #1
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Problem With a Navico Speed Log

Some years ago I purchased a Navico DL200speed log. I have finally gotten around to installing the unit only to find out that it is not working. I have checked and re-checked the connections, fuses etc., to no avail.

The display powers up and displays oooooo but when the tranceducer's paddlewheel is spun nothing changes on the display. I am thinking the transducer is bad. As Navico is no longer supporting its equipment some thoughts on how to sort out the issue would be qppreciated.
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Old 28-09-2011, 17:56   #2
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Re: Problem With a Navico Speed Log

Check out if the newer Plastimo sensors fit. They seem to have bought out Navico.

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Old 29-09-2011, 06:29   #3
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Re: Problem With a Navico Speed Log

Thank you. I called Navico yesterday and spoke with customer service and was told that they were going to look into what could be done. Not holding my breath. Spoke with Airmar and was informed it is not there transducer. Are these padlewheel senders typically interchangeable.

I have posted a picture of the transducer on the chance a CF member may be able to identify the brand.
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Old 29-09-2011, 06:54   #4
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Re: Problem With a Navico Speed Log

Pic of DL200 transducer
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Old 29-09-2011, 07:12   #5
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Re: Problem With a Navico Speed Log

Testing Knot-Log Speed Instruments

Paddle Wheel Type Transducers:
A Paddle Wheel type speed sensor consists of a magnetized paddlewheel, wherein the paddlewheel is rotatably supported in a cavity adjacent to a (Hall Effect) magnetic sensing device. The sensor generates electrical pulses corresponding to (proportional to paddle wheel speed) paddlewheel speed, as the wheel rotates when the vessel moves through water.

Knot Log Tap-Test:
1) With 12VDC Power and Instrument “On”; remove the coax cable from the connector found on the rear of the speed instrument (display).

Bend a paper clip into a U shape and place one end of the paper clip into the center hole of the connector (signal) on the rear of the unit.
With the other end of the paper clip tap on the outside (ground shield) of the same connector (essentially shorting the inside pin to the outside collar) rapidly while watching the display.

If the speed increases as you tap, then the instrument is capable of producing a speed. You should be able to see about a 5 knot speed with rapid tapping.

If not; you will need to send the knot meter in for service.

If this is ok, proceed to the next step.

2) Re-connect the cable to the rear of the knot meter, and locate the Paddle Wheel Speed Sensor in the hull.
Follow the cable about 10 feet back, and disconnect the cable at the junction.

Perform the same tap test at the end of the cable leading to the knot meter, by shorting the center pin to the outside shell.
Have someone observe the reading on the knot meter.

If you can produce a good reading on the knot meter, then the inter-connect cable is ok, and you will need to check the Paddle Wheel.

3) Remove the speed sensor from the thru hull fitting, and insert the dummy plug (if afloat).
Spin the paddlewheel by hand. If the display shows a speed you will need to replace the Paddle Wheel Transducer assembly.

If it does not show a speed, you will need to replace the Instrument.

Knot-Log Voltage Test:
1. Connect a DC Voltmeter to the centre (Signal) and “bare” (ground) wires of the Transducer.
2. With the Instrument “on”, slowly rotate the paddle wheel one paddle at a time.

The Voltage should switch from about “8” volts to near “0”, volts as the magnets in the paddles pass by the body of the transducer.

3. If the Voltage does not change, as the paddle is slowly rotated, replace the transducer.

From ➥ Testing Knot-Log Speed Instrument
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Old 29-09-2011, 08:07   #6
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Re: Problem With a Navico Speed Log

Thanks Gord, unfortunately the transducer does not utilize a coax cable, two wires to a control box, then multiple small wires to the display.
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Old 29-09-2011, 09:08   #7
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Re: Problem With a Navico Speed Log

The Blue & Brown wires at the Instrument will be the Signal & Ground.
http://www.equipment.ath.cx/instrume...vico-DL200.pdf

Evidently, the Navico DL200 can use a Stowe “Type B” Transducer.
http://www.stowemarine.com/StowePaddleSensorDL200.pdf
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Old 29-09-2011, 09:24   #8
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Re: Problem With a Navico Speed Log

Thanks again Gord, looks promising.
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