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Diffusion Caps C DF010 01
Diffusion Caps C DF010 02
Diffusion Caps C DF010 03
Diffusion Caps C DF010 05
Diffusion Caps C DF010 04
Diffusion Caps C DF010 01
Diffusion Caps C DF010 02
Diffusion Caps C DF010 03
Diffusion Caps C DF010 05
Diffusion Caps C DF010 04

Diffusion caps

Diffusion cap- aluminium

C-DF010

Diffusion caps are used to define the air gap between the sampling environment and sorbent surface during diffusive sampling (also known as axial or passive sampling). Used in combination with a single-bed sorbent tube, penclip and aluminium long-term storage cap (at the other end of the tube), diffusion caps offer a simple to use, lightweight approach to personal monitoring.

  • Defines the air gap for diffusive sampling at 15 mm, allowing use of published uptake rates
  • Prevents small insects/particulates from entering the tube
  • Complies with standard methods such as US EPA Method 325
  • Easy to use (push-on)
  • Cost-effective and re-usable

Product List

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Diffusion Caps C DF010 01

Diffusion cap- aluminium

For passive (diffusive) sampling- pk 10

Product Code

C-DF010

Diffusion Caps C DF010 01

Diffusion cap- aluminium

For passive (diffusive) sampling- pk 100

Product Code

C-DF100

Diffusion Caps C DF010 01

Diffusion cap- aluminium

For passive (diffusive) sampling- custom etched- pk 10

Product Code

C-DF010E

Diffusion Caps C DF010 01

Diffusion cap- aluminium

For passive (diffusive) sampling- custom etched- pk 100

Product Code

C-DF100E

Diffusion Caps C DF010 01

Diffusion cap- stainless steel

For passive (diffusive) sampling- custom material: stainless steel- pk 20

Product Code

C-DFS20

Overview

A diffusion cap replaces the long-term storage cap at the sampling (grooved) end of the sorbent tube for the duration of the sampling period. It is made of anodised aluminium and contains a stainless steel gauze.

When used for personal monitoring/occupational hygiene, the tube should be mounted in the breathing zone of the worker; for example on the lapel of their jacket, with the cap facing up. Markes recommends using diffusion caps in combination with aluminium long-term storage caps and stainless steel penclips to ensure that the sorbent tube is as light as possible, minimising unconscious changes in behaviour by those being monitored.

When used for fixed-location sampling, a suitable sampling site should be chosen. Markes recommends the Field Station for passive sampling  (EPA 325), which houses up to five sorbent tubes in a vertical position.

Note: The diffusion cap should be facing down for this sampling approach.

Typical sampling durations for diffusive monitoring are 8 hours for workplace monitoring and 1–4 weeks for ambient and indoor air monitoring.

For traceability purposes, diffusion caps can be supplied etched with a unique four-digit serial number.

Part numbers:
C-DF010 - C-DF010E - C-DF100 - C-DF100E - C-DFS20