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*** 15% off sorbent tubes - ends 31 July - online special offer ***

Connectors for sorbent tubes

A union is used to connect sorbent tubes in series, allowing breakthrough testing and/or pumped sampling onto two incompatible sorbents simultaneously. This sampling approach eliminates the risk of higher-boiling analytes migrating to stronger sorbents during sample storage, which can cause irreversible damage.

  • Protects strong sorbents during pumped sampling without the need for a multi-bed tube
  • Helps identify breakthrough, enabling subsequent optimisation of the sampling method
  • Allows independent analysis and conditioning of sorbents under optimised conditions
  • Allows sampling of VVOCs without compromising VOC or TVOC measurements
  • Suits industry-standard tubes (6.35 mm o.d.). By swapping the PTFE ferrule, it can also be used with 6 mm o.d. tubes

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Connectors For Sorbent Tubes C UNS10 01

Union- stainless steel

1/4" with PTFE ferrule- 10 pack

Product Code


Connectors For Sorbent Tubes C UNS10 01

Union- stainless steel

1/4" with PTFE ferrule- pack of 100

Product Code



The union for connecting sorbent tubes in series is made of stainless steel and houses two PTFE ferrules, one for each side.

The sorbent tube containing the weaker sorbent should be positioned in front with the sampling end of the tube open to the environment (for passive sampling, use a diffusion cap) and the non-sampling end attached to the union. On the opposing side of the union should sit the sampling end of the sorbent tube containing the stronger sorbent. For passive sampling, the non-sampling end should be capped with a long-term storage cap, while for pumped sampling it should be attached to the pump inlet.

Part numbers:
C-UNS10 - C-UNS100