Water tank gauge

[zrod]

Hi,

I have a problem with water tank gauge. The indication when the tank is empty is 50%,
What is the part that should be changed, or is there a calibration that can be performed on the level of the gauge.
Thanks.

 

[Steve Dion]

Gauge and sending unit! What are the brands?

 

[zrod]

Gauge and sending unit! What are the brands?

Theses are originals hunter 340 1999.
Unfortunately, i do not have access to the brand before a week.
Thanks for your support

 

[zrod]

I think it is a round WEMA analog

 

[Steve Dion]

Contact WEMA. They will have a test procedure.

 

[zrod]

Thank you,
i will

 

[Steve Dion]

Zrod:

I just found this.


Q: How to test if sender is operating correctly? http://javascript<b></b>:toggleDiv13();

1. Disconnect the sender wires at the sending unit.
2. Connect the 2 wires to an ohmmeter or multimeter and set signal to resistance.
3. Take measurement of the sender at empty and full positions.
   This can be done by either draining and then re-filling the tank which the sending unit is installed, or remove the sending unit from the tank and then manual operate the float by hand.
4. For American Standard, the meter will show 240 ohms at empty and 30 ohms at full.
   For European Standard, the meter will show 0 ohms at empty and 180 ohms at full.

You will probably want to check to make sure the float is moving in its full range.

 

[Ralph Johnstone]

My 1999 H310 is a Wema so I suspect your's is as well.

If the calibration route doesn't work, try the following:

Try removing the sensor from the top of the poly water tank. It is a long black cylinder with a float in the middle. See if the float is free moving and watch the gauge to see if it's also moving to match the position of the float. I know I had mine seize up a number of years ago, never happened again after I opened it up and gently freed it.

If not, you may be into an electronic problem which may mean a replacement. But don't worry, that's what boating is all about $$$$$$:cussing:$$$$$$$.

 

[Don12364]

Whilst it is a surprise to read Steve Dion's remarks that the US gauge differs from the European standard gauge because % tank full would be the same on both sides of the long pond, my 1996 H376 gauge suffered rust on the magnet encased in the little round foam float that runs up and down the central column. This caused the magnet to 'grow' inwards and stick on the central column.

As a result I took it all apart and this magnet operates latching reed switches inside the column. As the magnet passes up it closes each switch in turn and opens them again as it passes downwards. Very clever.

After repairing it and cleaning its magnet, it eventually broke its plastic central column due to 'free surface effect' of the water inside the tank in the bow when we were ploughing through some very rough seas.
Then I discovered there is a stainless steel version of the sender available from WEMA.
I bought it and this has proved entirely satisfactory in service.

For info see attached drawing I made in 2005