Liquid Level Identification

Hamilton (Venus) Venus Questions
1

Hello Forums,
No matter what vantage system I always have intermittent problems with liquid level detection whether it be caused by low volumes, low salt content in the liquid etc… it has always happened at some point or another.

Instead of just trusting that liquid is present by error handling to the bottom, is there a way to leverage TADM or another method to ensure liquid was actually aspirated.

I know there exists a library for actual volume aspirated based on liquid class adjustments but is there a library to help with this verification on the fly.

Basically if the system didn’t detect liquid, and the tip goes to the bottom tries aspirating and no liquid got aspirated then I want it to error not just using capacitance but using a few different parameters.

1 Like
2

On the STAR you can turn on MAD, but for small volumes it will not work.

For TADM you have to define the bands for EVERY single volume point.

3

Silly question but do you know if MAD available for Vantage systems and if there is already a library for it?

4

I don’t sorry haven’t used one in a couple years, we’re too integrated into STARs.

For STAR its a separate library that sends a firmware command, so I have to imagine its similar.

5

@zachary.milot the volume aspiration in the channels rely on a simple firmware command.

So you could build it as simple as sending the command PXQC to each channel (X = Channel number, remember that Vantage/STAR-V uses different format for your firmware command)

That firmware command will return a value qc with 5 digits for the max tip volume and 5 digits for the current volume in the tip. It will give you a rough estimate what has been aspirated.

You could do this upon error handling by the user. To be executed and if the volume is within X% of your target you continue.

3 Likes