a device to test %oil in water

The standard screening test for water in lube oil is the "Crackle test" which only requires a hot plate to conduct. Most commercial labs use this test to determine if a further test to quantify the amount of water is required. It is possible to use this test as trigger for water removal actions in your equipment such as filtration with water absorbing elements, centrifuging, or other water removal methods including oil changes.
There are water saturation meters available from several lubrication product vendors. A web search should be able to locate vendors with equipment to fit your needs.

BuckHntr:

% oil in water is VERY different from % water in oil.....

chemist:
I know there are several different instruments. These instruments are often used onsite, controlling waste water. If you give me a day, I will reply with some manufactorers.

In our lab we use FT-IR. The onsite instruments are usually just indicators, but I might find some more advanced systems.

Here are some suppliers. (Mostly monitors):

Turner Designs: http://www.oilinwatermonitors.com/

Ionics Instruments

Teledyne

Mr. Hughes
You are absoluly right and I misread your question. Hope you find what your looking for.

Thank you very much I apprecaite each reply

regards
chemist

Chemist

Is this coolant Concentration you're talking about ?

Are you looking for on site or Off Site equipments?

FRANKY,
yes this is coolant concentration analysis
and I need lab analysis equipment.
I take a two litres sample out of the coolant system every day for analysis.
Its concentration limit is 2.3% to 4.3%
acid cracking procedure takes time and consume acid.
I'm looking for one equipment that save my time, and gives the test results in minutes.

And if you have further information about in site equipment please send it also , I may need in the near future.

Thank you very much
chemist

Hi Chemist.

Not a device as such, but a method. try solvent extraction of the oil from the water followed by evaporation and gravimetric determination.

Cheap: Sep' funnel, small ammount of non-polar solvent, a balance and a beaker.

2% of 2 litres = 40 grams

You may be able to use much less sample?