Cant hit 29Hg on new pump? (I would imagine I am doing something dumb)!

I recently bought a vacum and am wondering I start the pump and my guage says im at 24.5Hg, wtf on my instructions it said cut a hole in top of guage (like plastic piece) anyways still only hit 24.5Hg, and it loses a few hg over like 30 minutes? Am I doing something wrong?

Sounds like a leak

Are you at a high altitude?

I am above sea level yes, does that impact this alot?

smokajoe said:

I recently bought a vacum and am wondering I start the pump and my guage says im at 24.5Hg, wtf on my instructions it said cut a hole in top of guage (like plastic piece) anyways still only hit 24.5Hg, and it loses a few hg over like 30 minutes? Am I doing something wrong?

Click to expand...

Sounds like a leak. What size chamber, which pump, does it have an isolation valve for the pump, do you have a picture?

Sorry I cant get pictures everyone, anyways it is a 3 gallon pot, with lid, manifold atop. I have a CPSS 4cfm single stage vacum. And again I am above sea level so how does that impact this?

So far, the Hg rapidly drops-how do I go about diagnosing the leak?

Soapy dish water and a spray bottle to find the leak.

Subtract approximately 1” of mercury per 1,000 feet of elevation.

I'm in Co.Springs

My vac pegs right before the 25 mark.

It's altitude on the gauge.

Teflon Tape on every threading, reinforce all hoses with a hose clamp.
Post back if you need more assistance.

GL Joe!

What SDL says about altitude. Here is the chart. You might try spraying acetone on the joints. If any gets sucked into the chamber, it will cause a sudden rise in pressure.