Accurate sensors

[ceejayt]

How accurate are your grey and fresh water sensors ?

 

[Podney]

Mine are not accurate down to the last cupful,but they are accurate enough for my liking. It’s a bit like a woman,you have to be able to interpret the signs.

 

[funflair]

Ours are spot every 25% increment it's just what going on in between thats a mystery THESE are supposed to be the biz.

 

[Riverbankannie]

I reported accurate as the fresh one is. However the grey waste one doesn’t work at all. Always dispose of some grey when filling with fresh is my solution

 

[Two on Tour]

Our fresh was way out when we got our MH, but I recalibrated it with the little adjustable trimmer on the back of our control panel.
Not so worried about knowing when the fresh is full, only when it's likely to run out.

The grey just lights up a red led when its time to empty.

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[WillH]

Do we really need them?

 

[Gellyneck]

Do we really need them?

We just ignore ours as they are woefully inaccurate!

 

[ceejayt]

Do we really need them?

My black tank doesn’t register despite having a very expensive sensor and unlike a cassette you can’t easily see the ‘upcoming’ problem.
I have invested in some RV sensors from the US which fit externally and therefore don’t get clogged up etc. Getting them fitted to all the tanks and LOG next month and will report in his that goes

 

[ceejayt]

This is the link fir thebRV sensors ...

<Broken link removed>

 

[EdwardFT]

Mine do 25% increments, allegedly. I could handle that, but they are also inaccurate. There are sensor rods of different lengths poking down into the tanks. But it seems to me that the rods in the fresh water tank get covered in limescale, which doesn't conduct electricity, and the sensors in the grey water tank get covered in slime, which does. Result: the fresh water shows empty even when it is full, and the grey water shows full even when it is empty.

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[ceejayt]

Ours are spot every 25% increment it's just what going on in between thats a mystery THESE are supposed to be the biz.

It seems to me that anything that relies on being inside the black tank (and the grey to some extent) is prone to error as they are easily clogged. The one you suggests only needs a bit of poo in the pipe and you are stuffed

 

[ceejayt]

Mine do 25% increments, allegedly. I could handle that, but they are also inaccurate. There are sensor rods of different lengths poking down into the tanks. But it seems to me that the rods in the fresh water tank get covered in limescale, which doesn't conduct electricity, and the sensors in the grey water tank get covered in slime, which does. Result: the fresh water shows empty even when it is full, and the grey water shows full even when it is empty.

over the last three vehicles I have had...

vehicle no 1 screws in the tank measuring 25%. Useless

vehicle no 2 rods - useless

vehicle no 3 ultrasound sensors useless

good on fresh, OK on grey but crap on black (pardon the pump)

 

[EdwardFT]

over the last three vehicles I have had...

vehicle no 1 screws in the tank measuring 25%. Useless

vehicle no 2 rods - useless

vehicle no 3 ultrasound sensors useless

good on fresh, OK on grey but crap on black (pardon the pump)

I am not squeamish about toilet stuff so I can check the cassette every time I "top it up". Fresh and grey are not so easily checked.

 

[EzeeRider]

It seems to me that anything that relies on being inside the black tank (and the grey to some extent) is prone to error as they are easily clogged. The one you suggests only needs a bit of poo in the pipe and you are stuffed

I'd agree, this was so with my first motorhome and the fresh water level indicator wasn't that brilliant either. My current motorhome has a reliable fresh indicator but no grey indicator. I judge how full the grey might be from the amount of fresh used. The grey tank is 2/3rds capacity of the fresh.
ezee

 

[funflair]

It seems to me that anything that relies on being inside the black tank (and the grey to some extent) is prone to error as they are easily clogged. The one you suggests only needs a bit of poo in the pipe and you are stuffed

Not read of any issues with them, seem popular in Germany, depending where they are fitted they are serviceable.

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[Richard n Ann]

We use on average 10L per day so we have 9 days worth as long as we keep to the average use.
Top back up after 1 days use and you have your daily figure, works for us

 

[Madcaravanner]

Simple they're NOT supposed to be accurate just a GUIDE

Freshwater is 25L increments so when full to 75% says 100% and so on to empty

Waste is either empty or full which is useless

 

[two]

What do you mean by 'accurate'?
I think mine is consistent but half = 75% and quarter = 40%.
It's only the last little bit that's important to me.
I'd like to know if there's only a kettle-full left or enough to wash-up as well.

 

[Pikeman]

Fresh is pretty accurate, but grey is useless. Could show 60%, then after emptying show 80%. Gunge on the sensor!!

 

[Jaws]

Mine simply do not work .. haven't done since the day we bought it..
The ones in the Miller worked for about a month before they died

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[Richard n Ann]

These are used on condensate trays on various commercial fridge systems. The defrost water sits in a tray underneath, when the level goes up they bring a heater on to boil it off. They are very reliable. If you had about 3 of them in the side of the water tank at 25% 50% and 75% you could switch some LEDs with them

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[Richard n Ann]

I've ordered one to fit at 25%. The wires to the useless resistance sensor thing are already in so I can use them and fit an LED in the control panel.. Another little job to do

 

[Wingman123]

I've ordered one to fit at 25%. The wires to the useless resistance sensor thing are already in so I can use them and fit an LED in the control panel.. Another little job to do

Hi,

Could you explain clearly what 25 % LED you have ordered and how to easily fit it in the control panel please.
Are they common to all tanks/control panels or model specific?
Thanks for your input.

Colin

 

[Richard n Ann]

Hi,

Could you explain clearly what 25 % LED you have ordered and how to easily fit it in the control panel please.
Are they common to all tanks/control panels or model specific?
Thanks for your input.

Colin

It's just a normal 3mm LED but it will indicate when the tank is at 25% or less because I'll fit the float switch a quarter of the way up the tank.

 

[Richard n Ann]

Just testing the switch now, don't want any nasty surprises after I've drilled a hole in the water tank. I don't suppose it's meant to be 18" below the water level but it's working great on this set up.

I've had to use a transistor to swap the switch action because it 'breaks on fall'

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[bigwood]

The grey water tank sensor or full warning light has never worked and the fresh tank level gauge is reading half a tank all the time.
I know how long a tank of water lasts and the grey tank is full when the shower won’t empty. I really can’t be bothered to sort out the sensors.
The buses I used to work on had the same sensors in the coolant tanks. They were so unreliable setting the low coolant alarm off for no reason. They were disconnected and the coolant levels were checked every night.

 

[G-RMPS]

I put in 10lt watering cans of fresh every day until I get a 50% indication. That's more than enough for a day, and probaby enough for two.

I empty grey and black every day, if possible. I assume sensors are just an approximate indication.

I also fly a plane. I don’t trust the fuel gauge in that either other than for a “general” indication. I put a calibrated stick in the tank if I really need to know specifics.

 

[tonyidle]

Just testing the switch now, don't want any nasty surprises after I've drilled a hole in the water tank. I don't suppose it's meant to be 18" below the water level but it's working great on this set up.

View attachment 434093

I've had to use a transistor to swap the switch action because it 'breaks on fall'

Turn it over - they work either way up.

 

[Reallyretired]

My fresh water indicator works in 25% increments and is not very accurate. The waste only gives a full warning when its about to overflow.
I empty grey when opportunity presents and fill up water likewise. Usually have pretty full water and nearly empty grey so don't fret about the gauges.

 

[Bobby-gg]

The grey on ours was unbelievably inaccurate, jumping continuously between 100% down to the 0% and all points in between including setting off the low limit alarm in the early hours of the morning.

Climbed underneath the van on Friday morning after filling the tank to overflowing and still only registering 30% and found that the spade connectors on the measuring buttons were all corroded, cleaned and rewired and it's worked perfectly this weekend

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