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    The EQUILIBRATOR® Passive Diffusion Sampler (PDS or PDB) is the world-wide number one passive groundwater sampler. 

    Diffusion samplers obtain representative, discrete interval samples of Volatile Organic Compounds in groundwater without purging or pumping. Effective for any site where VOCs are the main contaminant of concern. 

    Prefilled Equilibrator PDBs: For the easiest and most convenient installation, order prefilled samplers so they arrive on-site filled with certified de-ionized (DI) water, ready to install. Certificate of Analysis (COA) available for each DI water lot And,we've simplified the order process so that each size of prefilled Equilibrator now has it's own item order number, which includes the filling service.

    De-ionized Water Travel Blanks: EON provides a separate and inexpensive water "Travel Blank" of the exact same DI water and membrane used in the prefilled sampler so you can validate the pre-installation contents without sacrificing a sampler. 

    Fill Your Own Equilibrator PDBs: Order the unfilled Equilibrator PDBs and fill them with de-ionized water, on site, in your office or any other convenient place, using water from your lab or get bottled de-ionized water from EON. 

    How Easy Is It? Attach the PDB filled with DI water to a suspension tether using zip-ties and lower into the saturated zone in the well screen. While installed, VOC molecules from the water in the well diffuse through the semi-permeable sampler membrane until the VOC concentrations in the sampler are in equilibrium with the surrounding groundwater.The sampler contents maintain equilibration with the surrounding groundwater even when the groundwater concentrations change. Recover the Equilibrator at the next sampling event and install another sampler for the next round. No need to go back to the well just for recovery and there is virtually no maximum time between installation and recovery.

    Why Use the Equilibrator?
    • Reduce sampling cost 50%-70% by eliminating field time spent purging and the cost of purge-water disposal.
    • No expensive, complicated, or bulky equipment to purchase, maintain, or mobilize.
    • Obtain depth-specific concentration profiles.
    • Reduce sampling error and improve repeatability.
    • A Greener sampling method. Less disposable materials, no batteries, gasoline or waste

    Equilibrator Design Features

    • Built-in suspension handle, attaches readily to suspension tether.
    • Semi-permeable LDPE membrane holds deionized water and allows transmission of VOCs into sampler.
    • Easy emptying methods; puncture with VOC straw or remove plug & pour.
    • Filling port for field, lab, or factory filling.

    Required Components

    • Equilibrator samplers, one per sample interval
    • Deionized water to fill samplers (or purchase Prefilled samplers)
    • Fill kit (1 per deployment team, reusable)
    • Tether/suspension cord (1 per well, reusable)
    • Stainless steel weight (1 per well, reusable)
    • Well cap with attachment ring from which to suspend the Tether (1 per well, reusable)
    • Cable ties to attach PDBs

    Optional Items

    • Stainless steel hanger for use in wells with one sampler (1 per sampler, reusable)
    • Snap clips for easy connection of tether to sampler or well cap
    • Connection points on tether for multiple samplers
    • Tether preparation service
    • VOC resistant shipping and storage pouch

    EON's Equilibrator Passive Diffusion Sampler can be used for surface water too!

    Item # Description/Size Availability Qty Break Price Quantity
    GSD200-PF1
    Equilibrator Passive Diffusion Sampler (PDB), Prefilled with ASTM Type 1 Deionized Water; 18in x 1.75in 350 ml. Discharge Straws (GSD290) are included but packaged separately.
    In Stock 1 $25.70
    GSD210-PF1
    Equilibrator Passive Diffusion Sampler (PDB); 24in x 1.75in, Prefilled with ASTM Type 1 Deionized Water; 500 ml Discharge Straws (GSD290) are included but packaged separately
    In Stock 1 $29.70
    GSD220_PF1
    Equilibrator Passive Diffusion Sampler (PDB); 36in x 1.75in, Prefilled with ASTM Type 1 Deionized Water; 750 ml Discharge Straws (GSD290) are included but packaged separately
    In Stock 1 $50.25
    GSS10-100
    Service: PDB Blank, prefilled w/ 100 ml of ASTM I deionized water
    In Stock 1 $4.00
    GSD325
    PDB Storage Pouch. Resists diffusion of VOCs from the air into the pouch. Used to help prevent VOCs in surrounding air from entering the PDBs in the pouch during transit and storage.
    In Stock 1 $5.35
    GSD200
    Equilibrator Passive Diffusion Sampler (PDB); 18in x 1.75in 350 ml Discharge Straws (GSD290) are included but packaged separately
    In Stock 1 $17.80
    GSD190
    Equilibrator Passive Diffusion Sampler (PDB); 12in x 1.75in 150 ml Discharge Straws (GSD290) are included but packaged separately
    In Stock 1 $17.80
    GSD210
    Equilibrator Passive Diffusion Sampler (PDB); 24in x 1.75in 500 ml Discharge Straws (GSD290) are included but packaged separately
    In Stock 1 $19.50
    GSD220_
    Equilibrator Passive Diffusion Sampler (PDB); 36in x 1.75in 750 ml Discharge Straws (GSD290) are included but packaged separately
    In Stock 1 $37.80
    GSD230_
    Equilibrator Passive Diffusion Sampler (PDB); 48in x 1.75in 1 Liter Discharge Straws (GSD290) are included but packaged separately
    In Stock 1 $45.90
    GSD240_
    Equilibrator Passive Diffusion Sampler (PDB); 60in x 1.75in 1.2 Liter Discharge Straws (GSD290) are included but packaged separately
    In Stock 1 $49.20
    GSD307
    PDB Fill Kit for Equilibrator 1.75in Diffusion Sampler
    In Stock 1 $3.50