[C320-list] Holding tank monitor sensor

[John Frost]

I have precisely the same situation on my holding tank sensor. And I had it on the first day that they delivered my boat in 2009 when the holding tank had never even been used.
I attribute it to the positioning of the sensor, possibly too near the bottom of the tank. I "solved" the problem by putting a small label under the indicator that says "1/3 = empty".
Works for me.
I assume the right way to fix it is to unglue the sensor and raise it a bit.
An alternative might be to disconnect the wire to the sensor to just not get a reading when the tank is low.

John
2009 C320MKII
Hull  #1118
Lake Guntersville, AL

-----Original Message-----
From: C320-list <c320-list-bounces at lists.catalina320.com> On Behalf Of ROBERT MILLER
Sent: Friday, January 15, 2021 3:45 PM
To: c320-list at lists.catalina320.com
Subject: [C320-list] Holding tank monitor sensor

I have a tank monitor system for both fresh and black water, which has 3 sensors installed on the outside of the tanks. On my holding tank the first sensor isn’t working anymore (it always reads 1/3 full even when the tank is empty). I suspect there is crud stuck to the tank wall which is causing it to read full, but there is no clean out on the tank. Has anyone encountered this problem and have a solution on how to clean the interior walls to hopefully remedy this issue?
Thanks,
Rob Miller
Alchemy
1999 #571


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