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  Equilibrator Diffusion Sampler

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The EQUILIBRATOR Passive Diffusion Sampler (PDS or PDB) is used in place of purging and low-flow sampling methods in groundwater monitoring wells to obtain representative, discrete interval samples of Volatile Organic Compounds (VOCs) under natural groundwater flow conditions.

For a comparison of the effectiveness of hydrasleeves for sampling from groundwater monitoring boreholes see US ITRC Sampling Report. For a list of pros and cons, dos and don'ts for using Passive Diffusion Bags such as the Equilibrator, see PDBs pros and cons.

Simply fill the sampler with deionized water, install one or more PDBs in the zone(s) of interest and return at the next sample event to collect samples and replace samplers.

The EQUILIBRATOR is also used in surface water and in stream bed sediments and embankments to identify and monitor VOC contaminant discharge areas. The EQUILIBRATOR can be used to sample discrete and multiple intervals in a borehole well casing. Obtain concentration profiles at multiple intervals simultaneously by attaching several Hydrasleeve samplers to a single tether line.

DOWNLOADS
Equilibrator Instructions For general guidance when using in the field.


For more details:
Equilibrator
 or
Download as PDF

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Equilibrator Disposable Diffusion Sampler

Standard Equilibrators are suppleid in sealed bags. Use optional filler kit to facilitate transfer of deionised or other laboratory prepared water prior to use. For instructions on how to prepare and use, see pdf.

	Code Description
EEQ-350 Equilibrator Diffusion Sampler (350 ml)   EFK-306 Equilibrator - Standard Fill Kit (funnel)

Reusable Hangers and Accessories

Use the optional stainless steel hanger For suspending 1 or 2 Equilibrators in series in a borehole. Three or more Equilibrators are best joined together in series by tying to a single tether cord and using heavier weights attached to the end of the tether.

	Code Description
EEH-310 Equilibrator - Stainless Steel Hangers (Reusable)   ESC-135 Plastic Snap Connectors for holding Equilibrator to Tether Line

Reusable Sainless Steel Weights

A series of reusable Stainless Steel weights are available for suspending one or more Equilibrators in a borehole. The smallest 175g weight is best used with a single Equilibrator at up to 25 metres below water, the 275g weights with 1 or 2 Equilibrators. Heavier weights (525g) can be used singly or added in line for deploying multiple samplers on a single tether line or for working at greater depths. See pdf for illustrations of weights and their use.

	Code Description
EWT-150R SS Weight 175g with eye and split ring (35mm dia)   EWT-250R SS Weight 275g with eye and split ring (35mm dia)   EWT-500R SS Weight 525g with eye and split ring (35mm dia)

Suspension Cord (Polyester and Kevlar)

Choose either 3.5mm diameter braided polyester cord or for greater durability and strenght 2mm kevlar cord. Both are provided on cardboard spools.

	Code Description
BC/K35-50 Lifting Cord - 3.5mm diam polyester cord (50m)   BC/K35-300 Lifting Cord - 3.5mm diam polyester cord (300m)   KC2-100 Kevlar Rope (100m x 2mm - spooled)

Ties for Tethering

Cable ties can be used to connect the top and bottom of the equilibrator to the braided cord. Downoad instruction sheet at top of page for illustration.

	Code Description
EWT-CT100 Cable Ties (100mm) Pack 100   EWT-RING SS Split Ring (25mm)

Manual Reels with Removeable Spools

A simple high impact hand reel avoids unsightly and dangerous trailing of cord on the ground during use. The reel can hold up to 100m of 3.5mm polyester cord, and easily accommodates 100m of 2mm kevlar cord. The spool is removable, and additional spools can be purchased.

	Code Description
ERL-110 Hand Reel with removable spool (holds 100m of 3.5mm cord)   ERL-111 Extra Spool for Hand Reel