Level Sensors

[Ding Dang Doo]

Righto,

I've got a feed from my RO unit into my auto top up. The RO unit has a long feed pipe from the kitchen to where the tank is situated, which I manually turn on to top up, manually turn off when full.

I've got the two level sensors for my Profilux, so I'm wondering if there is a bit of kit that would mean I could leave my RO feed on all the time, an the sensors then automate the auto top up refill!

Does that make sense?

ATM I have a D-D Auto top up sensor running from sump level activating fill from top up tank...

Thanks

Pete

[stevew@reefdreams]

This is considerably more difficult than it first appears, due to how an RO unit functions.

In simple terms, a sensor in the top up water container could control a solenoid valve that would turn off/on the Ro water supply. You would need an auto shut off kit for the RO unit so that the waste is also shut off at the same time.

However, when an RO unit first starts up the TDS output is really high >150 depending on location. So this simple system would hammer the DI resin as the RO unit would switch on/off repeatedly as the main tank is topped up.

So to take it to the next stage, you could use two level sensors in the top up water container, one for max level and one for min level. Therefore the RO unit wouldn't switch on until the container was nearly empty and therfore reduce the number of on/off cycles the RO unit goes through and therefore preserving the DI resin.

To take it further you would need to use a system of solenoids to flush the first few gallons of RO water to waste before switching to production and filling the container. There are posts in the DIY section from memory detailing how to do this.

When you know which route you want to go down I explain how to do it from the GHL side, but that is rather secondary to getting the RO unit set up correctly.

Steve

[Ding Dang Doo]

This is considerably more difficult than it first appears, due to how an RO unit functions.

Why is it I had a feeling this would be in the answer!:rolleyes::D

In simple terms, a sensor in the top up water container could control a solenoid valve that would turn off/on the Ro water supply. You would need an auto shut off kit for the RO unit so that the waste is also shut off at the same time.

Why would the waste need to be shut off too? ATM, the waste goes down the drain as the RO is being produced, the RO goes into a pressure cylinder, until required (Oh, I didn't tell you it had a pressure cylinder, did I?:whistling:), so I don't understand, if I've got a max and min level sensor, then why the waste shut off thing?

However, when an RO unit first starts up the TDS output is really high >150 depending on location. So this simple system would hammer the DI resin as the RO unit would switch on/off repeatedly as the main tank is topped up.

Oh, I didn't realise this, so the first few gallons EVERY time I use the unit has high TDS? Or just when you do an DI change? I thought it was just when you do a DI change. My TDS always reads zero. I change everything every 4 months.

So to take it to the next stage, you could use two level sensors in the top up water container, one for max level and one for min level. Therefore the RO unit wouldn't switch on until the container was nearly empty and therfore reduce the number of on/off cycles the RO unit goes through and therefore preserving the DI resin.

Ooooh! I understand that bit!:cool:

To take it further you would need to use a system of solenoids to flush the first few gallons of RO water to waste before switching to production and filling the container. There are posts in the DIY section from memory detailing how to do this.

I'll have a trawl...

When you know which route you want to go down I explain how to do it from the GHL side, but that is rather secondary to getting the RO unit set up correctly.

Steve

Gulp! :)

Pete