Delay Tubes

Aura Industries, Inc. has Knitted Delay Tubes (KDTs) to aid in the mass spec. or UV directed fractionation of HPLC fractions, in flow injection analysis etc. The knitting minimizes peak broadening while keeping the tubing in a compact size. Each KDT comes with two flangeless ferrules and nuts for connecting to 1/4-28 fittings. An optional connector with female 1/4-28 and female 10-32 threads with a 1 mm thru-hole is available (Cat# 1583). This connector allows connection of the 1/4-28 fittings to the standard 1/16 inch HPLC tubing. Additional KDT sizes are available upon request.

Catalog #

Length (m)

ID (mm)

OD (mm)

Nominal Vol. (mL)

KDT 5-100

5

1

2

4

KDT 10-100

10

1

2

8

KDT 15-100

15

1

2

12

KDT 20-100

20

1

2

16

P.342x*

Package of 10 flangeless ferrules, 2 mm ID

P.301x*

Package of 10 1/4-28 nuts

1583

Stainless Steel 1/4-28 to 10-32 connector

KDTs are currently employed by several laboratories for use in many different applications and are specifically mentioned in an article in the International Journal of Mass Spectrometry:  

“Due to the low flow reaching the MS after the splitter relative to the high flow directed towards the collector or waste, a delay tube is placed between the prep UV and the fraction collector.  The delay tube is designed to keep the eluent from reaching the collector valve too quickly, thus, allowing sufficient time for the flow directed to the MS to be analyzed and a determination to collect the sample or direct it to waste to be made.”  (Goetzinger 2004)

For a complete pdf copy of the article by Goetzinger, et al. 2004, please click here. . .

Consult Aura Industries directly as to whether use of KDTs is appropriate for your MS/HPLC analyses.