Ink Level Detection In Jet Printers

Sadly, the preferred method seems to be to "measure" the usage and then arbitrarily determine that it's empty. Oops, it's still half full...... too bad.

l...... too

There are dozens of patents where inductance or capacitance measures the level.

Bret Cahill

I usually replace the cartridge when it quits printing.

Cheers! Rich

Then why did you ask in the first place?

when it stops printing?

one way is droplet counting, often done by the printer driver.

too

Because there are dozens of patents based on inductance, capacitance, resistance, ultra sound and other effects.

Generally one technology will prevail.

Which one is it?

Bret Cahill

too

Some are optical.

Cheers

The cheapest one that the makers of the printer have access to the patent on, and works well enough to satisfy their legal obligations.

Generally, the one that people are willing to pay for.

Hope This Helps! Rich

=>What is the method of determining the ink level? =>

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=>Bret Cahill =>

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Oh, dear...What was the question? Terry--WB4FXD Edenton, NC

None. Nada, Zip, Zilch. Level is not determined or detected.

The worst ones count pages, and assume ink was squirted on the pages, and stop printing after 200 pages, or whatever number.

The slightly less bad ones count how many droplets they think they have squirted out, and call themselves empty when there's about 25% left based upon the theoretical size of a drop and the fill amount.