Shut-Off Valves

  • Direct Connect 1/16", 1/32", 360 µm OD Tubing, plus other Capillary Tubing
  • Low Swept Volume
Use Upchurch Scientific® MicroTees, MicroCrosses or MicroElbows to join capillary tubing. All of these products are made entirely of PEEK™ and have 0.006" (150 µm) thru-holes, with resulting swept volumes ranging from 20 to 81 nL.

Several of these products are designed to connect capillary tubing of various ODs, using our MicroTight Tubing Sleeves. Versions to directly connect 1/16", 1/32" and 360 µm OD tubing are also available. In addition, the MicroElbow and one version of the MicroTee come with convenient pre-drilled 0.13" (3.3 mm) mounting holes.

Several researchers use our PEEK MicroTee to introduce ionizing voltage to their fluid stream just prior to a Mass Spectrometer. MicroTees are well suited for this application due to advantageous internal geometry and PEEK polymer's electrical resistance. The materials required for this setup are as follows: one gold or platinum conducting wire, one P-775 or P-875 MicroTee, one MicroTight Tubing Sleeve for the conducting wire (as needed to accomodate wire diameter), and at least two more MicroTight Tubing Sleeves to connect your capillary tubing.

Connect the wire to the center port of the MicroTee. First, thread your wire through the appropriate tubing sleeve, if necessary, with the wire extending beyond both ends of the sleeve. Slip the female nut included with the MicroTee over the wire or sleeved wire, followed by the ferrule - ensuring the wire (and its sleeve) extends well past the end of the ferrule tip. Align the tip of the wire with the thru-hole of the MicroTee and gently insert the wire until it bottoms out. Now finger tighten the female nut into place. Attach your flow path tubing to the MicroTee's two other available ports, following the instructions provided with the MicroTee.

Begin fluid flow through the tee and apply voltage to the conducting wire lead. This setup typically provides effective electrospray ionization in applications having a flow rate of 100 µL/min or greater.

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