Check out isogeochem wiki pages. Under repair tips there are two listed (bottom of the page). I have used the second one listed, “DIY GasBench Needles.pdf” posted by Stephen Romaniello. All parts are listed, which is handy. And it is a very sturdy setup. I’ve used glass capillary tubing I already had as the return (sampling) tubing on the needle so that I can still monitor for moisture in the line. I’ve been using on my GasBench. Works well.





Alison Pye • [log in to unmask]

Stable Isotope Lab Coordinator

CREAIT • TERRA Facility • Stable Isotope Lab

Alexander Murray Building

Memorial University of Newfoundland

St. John's, NL • Canada • A1B 3X5

ph: (709) 864-3217 • fax: (709) 864-2589




From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of WASSENAAR, Leonard Irwin
Sent: February 22, 2017 6:58 AM
To: Alison Pye
Subject: Double walled needle recipe


Colleagues –


Does anyone have a great recipe and parts list for the construction of a double-walled side-port or bottom-port needle, the kind where the bottom/side port can be sealed by holding inside a 2-3 mm thick vial septa and the rest flushed with He gas?  E.g. for use on Gasbench, Trace Gas, Multiflow, etc.  




Leonard WASSENAAR, Ph.D. |Team Leader |

Department of Nuclear Sciences and Applications | Isotope Hydrology Laboratory |

International Atomic Energy Agency | Vienna International Centre, PO Box 100, 1400 Vienna, Austria |

Email: [log in to unmask]  | T: (+43-1) 2600-21766|


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