Re: [DIYbio] Firing up a mass spec

On 10/04/12 00:25, Josh Perfetto wrote:

> - "Zero air is air that is clean, dry and oil-free. One line of zero
> air must be supplied to the instrument at 100-105 psi for "gas 1" and
> "gas 2" with flows of 22.5 L/min."

Is this meaning (gas 1 at 22.5 L/min) AND (gas 2 at 22.5 L/min)?

> - "Source exhaust air needs to be oil-free and between 55 and 60 psi
> with flows of 6 L/min. It is used to suck source waste out of the
> instrument. Source exhaust air can be UHP nitrogen or zero air, but it
> can also be oil-free air from a separate supply. If the gas is from a
> separate supply, one line of oil-free air must be provided for the
> instrument."
>
> Where do I get zero air, can this be obtained from a compressor?
Yes, and they're usually spec'd in cfm.

lpm * 0.0353 = cfm, so sounds like you need .8 + .8 cfm at 102 PSI
and .2 cfm at 57 PSI. Then you go through a toilet roll air filter
canister to de-oil the air.


> 3. Source exhaust - the manual says: "During operation, solvent vapors
> are exhausted from the ion source by the Source Exhaust Pump to a 1.27
> cm ID barbed fitting at the rear of the instrument. These vapors pass
> through a trap which then must be vented to a fume hood, or outside
> port. The diameter o the trap exhaust port is 1.27 cm. It is the
> responsibility of the customer to provide the proper plumbing from
> this trap to the ventilation point.". I found the barbed fitting, but
> not sure what I need to do.

Sounds like the trap is built in. Needs more reading the manual.

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