Author Archive

How to Determine the Size of 1/4” and 1/8” National Pipe Thread tapered (NPT) Fittings

Restek’s Technical Service team gets quite a few questions from customers about fittings. There is a bewildering assortment of fitting types and sizes as you can see here on the Restek web site. A blog post titled, “I need a fitting, but which one?” is where we often direct customers for help with these questions. […]

Measuring Capillary Column Flow: “To ProFLOW or not to ProFLOW, that is the question”

Occasionally the Restek Technical Service group gets a request from a customer for information on how to measure the carrier gas flow from their capillary column with the Restek ProFLOW 6000 Electronic Flowmeter.     Although this electronic flowmeter is designed to measure volumetric flow for gases across a range of 0.5–500 mL/minute, there are […]

Connecting a Restek ProFLOW 6000 Electronic Flowmeter to an Agilent Split Vent or Septum Purge

The Restek ProFLOW 6000 Electronic Flowmeter is a very useful tool for the measurement of any type of gas commonly used in chromatography. The tubing coming out of the ProFLOW 6000 is made of a flexible elastomer about 28” long with a ¼” OD and a 1/8” ID. We occasionally get questions about how to […]

Indicating Oxygen and Moisture Traps-“Hey, it looks like my trap arrived partially spent”

The Restek Technical Service group occasionally receives questions from customers who receive their Indicating Oxygen Trap, cat. #22010 or 22011, and they are concerned that it arrived partially spent. This is because the material inside is black on both ends with a green colored material in the middle of the trap. The green material is […]

My Merlin Microseal Septum seems to be leaking!

In a previous post (see Merlin Microseal or Septa… should they really “SEAL”?) the topic of leaking with the Merlin Microseal was discussed. We recently had a customer use a Restek Leak Detector to test for helium at the top of a Merlin Microseal and this sensitive device did indeed detect helium coming from the […]