high purge flow measured on P&T

[tangaloomaflyer]

We have a system that has very high purge flow (120ml/min) when measured through the vent of the concentrator. Visually, the bubbles do not appear to be forming at a much higher rate than an instrument purging at 40ml/min. Am I right in assuming there must be a constriction in the flow path of the concentrator? Samples are being purged in an Archon autosampler and the sample gas is connected to the T-piece on a Velocity concentrator. the system is having problems holding a calibration. It will be steady fro a while but then responses will fluctuate.

[kubowicz.tomasz]

Hello

What kind of glassware are you using for purging? Frit or fritless ?

Tomasz Kubowicz

[tangaloomaflyer]

Fritless. 10ml of aqueous sample is in a gas tight vial. It is purged by the soil probe on the autosampler. No heat, 7 minute purge.

[Yama001]

Perhaps both the Archon and the Velocity are purging? The purge supply line to the sparger is diverted to a solenoid valve on the left rear of the Archon - in water mode it simply diverts the flow back to the sparger; in soil mode it is blocked, so only the Archon soil pruge line reaches the concentrator.

[tangaloomaflyer]

I will double check, but we are running the Archon in soil mode.