Cliffy Posted November 5, 2012 Share Posted November 5, 2012 Our waste water level keeps getting gunged up and indicates 0% full all the time. I thought that if I cut the leads to it and put male/female spade connectors in line I could just unplug it and take it in the house degrease it to make it easier to clean, which it did but (there always is a but) It now works but (another one) only reads 0% full or 100% full. There is no 50% reading as there used to be. Could this be because the spade connectors are creating a resistance or is the level switch faulty? If I just twisted the wires together would that sort it. I haven't got much spare lead to play with.I don't need it working as I know by how much fresh water I have used how full the waste tank is but I like to keep things right. Link to comment Share on other sites More sharing options...
Derek Uzzell Posted November 6, 2012 Share Posted November 6, 2012 If your waste-water tank gauge can provide a 50%-full readout, I assume your removable level-sensor is 'probe-type', not a simple switch that could only warn when the tank was approaching full. As long as the 0% and 100% readings are accurate, I can't see your use of connectors being the reason yuo've lost the 50% reading. If you want check the operation of the level-sensor, removing it and 'bridging' across the probes should reveal whether it's faulty. Link to comment Share on other sites More sharing options...
Cliffy Posted November 6, 2012 Author Share Posted November 6, 2012 DerekThe sensor is a float about 25mm long that pivots up and down. The grease makes it stick, usually in the down position (0% full). I have tried it outside the tank and I can't get it to read 50%.The leads to the sensor are quite fine which led me to think that the line resistance may be important.Cheers Cliff Link to comment Share on other sites More sharing options...
Clive Posted November 6, 2012 Share Posted November 6, 2012 Or is it the ultrasonic type that will need re-calibrating each time you disconnect it? C. Link to comment Share on other sites More sharing options...
Derek Uzzell Posted November 7, 2012 Share Posted November 7, 2012 Cliffy - 2012-11-06 10:37 PMDerekThe sensor is a float about 25mm long that pivots up and down. The grease makes it stick, usually in the down position (0% full). I have tried it outside the tank and I can't get it to read 50%.The leads to the sensor are quite fine which led me to think that the line resistance may be important.Cheers CliffThere are tank-content sensors with multiple 'float-switches'http://www.leesan.com/uploaded_files/datasheets/dtm4%20owners%20manual.pdfthat can provide a range of readouts, but I would expect the type of single pivoting sensor you've described to only provide one 'warning' readout when the switch in the sensor closes. The little pivoting Zig float-sensor on my Herald just switched on a control-panel warning light when the waste-tank was approaching full. Assuming that your motorhome has a similar arrangement, with the float-sensor in the side of the waste-tank towards the top, it's difficult to see how any sensor with a pivoting float only 25mm long (about the same size as the Zig product) could do more than provide a 'tank near full' readout, as the level of the tank contents at 50% full should be well below the float-sensor's position in the tank. Basically, the sensor would provide a 0% readout until the tank contents caused the float to pivot and close the sensor's switch, when the readout would change to 100%.I'm reluctant to suggest that your sensor is unable to provide a 50% readout, as you've said that it used to, but I did find this MHF thread that may be relevant: http://www.motorhomefacts.com/ftoptitle-63631-auto-trail-apache-700-waste-tank-full-lcd-reading.html Link to comment Share on other sites More sharing options...
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