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Thanks EdStainless and Littleinch As I said the pump is second-hand and I wasn't sure how they wear but your answer suggests this shouldn't be a problem which is what I wanted to hear. I have run it for up to 12 hours and it is very quiet and smooth and I have recorded a small but progressive...

Thanks, mk3223 and LittleInch for your responses LittleInch -The transmitter assembly manufacturer claimed 0 to 2.5 bar, but now checking the details on the actual sensor, a Honeywell piezoresistive silicon pressure sensor, they only claim a range of 60mbar to 2.5 bar which explains much. Does...

A subsequent question the sensor shows the pressure bouncing about by say +/- 5 Pa and occasionally +/-10 Pa. Is this the sensor or would this be a result of pressure waves?

In my quest to achieve a 1Pa to 5 Pa vacuum (see earlier posts) a question of how long to run the pump for. The pump reaches an optimum pressure quickly and then the reduction becomes almost insignificant but there appears to be very small reduction over 15 to 30 minutes is there any point in...

Thanks Tmoose the wiki page very use and it looks like I've used all the wrong materials.

I have built a homemade vacuum chamber with the intention of developing a reliable vacuum of 1 Pa to 5 Pa, however when I isolate the pump the pressure rises by 100 Pa in 5-10 minutes and then the rate tapers off to insignificant rise after 24 hrs approx; between 900 Pa to 2,400 Pa (similar to...

Thanks LittleInch and EdStainless, I'll just have to find a better pump. One thing EdStainless what volume do you consider to be bulk storage and why do you think this to be the case.

I am trying to replicate a vacuum flask (on a low budget) with a 1m long 8 inch UPVC pipe forming the outer shell. A search of the internet suggests that the influence of convection stops around 10 Pa, however the vacuum pump I have, a two stage rotary 3 cfm advertised to achieve a vacuum of 2...