Expert’s answer: Flow measurement of low conductivity products

Glad you asked because it’s difficult to do the flow measurement of low conductivity using a magmeter. Why? Well, the principle of the flow meter requires a minimum conductivity to allow the flow meter to work properly. Although you can find a magmeter that works in a low conductivity, the limit is usually 5 μS/cm.

My recommendation is to change the time of principle for your application. In fact, you have a bunch of good options for your application and most of them have a similar price tag or are affordable in comparison to a magmeter.

flow measurement
Courtesy of Siemens

For example, a vortex flow meter could be a good option for flow measurement of low conductivity products. The vortex doesn’t work based on the level of conductivity and you have a cheap version of vortex flow meter only for liquid measurement.

A thermal flow meter for a liquid application might help too. Although its construction limits accuracy, it should still handle a flow monitoring application just fine.

Remember these options if someone else offers you a magmeter for your use. And for the rest of you, you may find low conductivity products in your industries and applications, too.

For instance, the most common is demineralized water, also known as deionized or distilled water. This type of water has had most or all of its minerals, salt, and ions removed, turning it into purified water. This process reduces the water’s capacity for conducting electricity.

And many oils on the market qualify as low-conductivity products. Their chemical composition doesn’t allow much conduction. As for non-liquids, you can find a long list of low-conductivity products: rubber, glass, wood, and more.

If you have any more questions regarding flow measurement in low-conductivity products, contact us through online chat, email, or phone. Our engineering team will be happy to help you!


Below you have the list of the flow meter on the market:

Other resources that might interest you

Flow meter for process water
I need a flow meter, but I don’t know exactly which type. The product will be process water with a maximum flow range of 100 m³/h and ambient temperature. It won’t need much accuracy because it’s just a monitoring application. Can you help?

Capacitive level transmitter
Where can I use the capacitive level transmitter? Can you tell me more about it and how I install it?

High turndown flow meter
I am needing a flow meter capable of a turndown ratio of almost 70:1 (20 liters per minute down to 0.3). I haven’t found a single flow meter that would do the trick. Any ideas?


Recommended articles