Re: [DIYbio] Vacuum pumps?

On 7/25/20 9:01 PM, Daniel C. wrote:
> Has anyone put together a system like this?  What products / brands have you had success with?  I'm particularly interested in
> pump reviews.

I have not, but there are hackaday articles about repurposing refrigeration pumps to do vacuum. They talk about ongoing vacuum
oil maintenance needed, etc., so that's your requested review. To simply speed filtering, a 90% vacuum would be enough. You
could make a system with pressure switch and relays to turn on/off a tiny fridge compressor. The pressure switch could be one of
the pressure ICs available, or for completeness, an Industrial Pressure Sensor that includes switch contacts and pipe fittings.
The price of the Industrial pressure switch is about $36 from Mouser and a Melexis IC is $12. For $12 you get a 5 volt output and
some complicated way to adjust the trip point that will require programming a microcontroller and then you'll need relay drivers
or a SSR for another $10 in parts and loads of design time, so the Industrial pressure switch for $36 looks good for a one off.

Running a small fridge compressor this way would not strain it, (unless you left the vac valve open all weekend maybe...).

--
-- You received this message because you are subscribed to the Google Groups DIYbio group. To post to this group, send email to diybio@googlegroups.com. To unsubscribe from this group, send email to diybio+unsubscribe@googlegroups.com. For more options, visit this group at https://groups.google.com/d/forum/diybio?hl=en
Learn more at www.diybio.org
---
You received this message because you are subscribed to the Google Groups "DIYbio" group.
To unsubscribe from this group and stop receiving emails from it, send an email to diybio+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/diybio/155ee649-8975-e893-d2ad-f769fa37a55a%40industromatic.com.