Questions tagged [electrochemical]

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Can I measure free chlorine content in treated water using ORP sensor? [closed]

In my project, I need to measure pH, turbidity, and free chlorine content in treated water from wastewater. I found sensors for pH and turbidity but when I search for chlorine sensor, I found it but ...
9
votes
7answers
3k views

A battery is not connected to anything. Is there a voltage between its plus and minus poles?

Here's one mental picture of a battery: The electro-chemical reactions inside the battery happen only when there's a closed circuit. When you place a voltmeter across the poles, then you create a ...
2
votes
1answer
128 views

Why do positive terminals on DC devices exposed to water corrode more than negative terminals?

I'm a glaciologist working in Patagonia where everything is always wet. Often water makes its way into instruments, radios and other devices and I feel that always the positive terminals of batteries (...
1
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0answers
32 views

How to control the potential in multiple-electrodes (3 or more) in electrochemical cells?

Usually, in most cell designs, the concept of two-electrode design is the baseline. The two electrodes are anode and cathode where the electron transfer happens between them. However, I have been ...
1
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0answers
46 views

Why do sensors or biosensors use AC excitation signal and not square wave signal?

I have recently started looking into transducers to measure a natural physical phenomena. The sensors I read about, especially electrochemical sensors like interdigital electrodes use a sinusoidal ...