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Passive Water Samplers and Sampling Equipment | EON Pro | EQUILIBRATOR PDS or PDB
Equilibrator PDB
Passive Water Samplers and Sampling Equipment | EON Pro | EQUILIBRATOR PDS or PDB
EON Equilibrator Passive Diffusion Samplers -
EON Equilibrator Passive Diffusion Samplers -

EON Equilibrator Passive Diffusion Samplers

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.
  • Reduce Sampling Error and Improve Repeatability.
  • Sustainable & Green Sampling Method. Minimize Disposable and Life Cycle Cost Materials.

Make Sampling Even EASIER with these Optional Services:

  • Suspension Tether Preparation Service. EON will use your well construction data to construct cut-to-length suspension tethers for individual wells. Click Here to go to Suspension Tether Preparation Services.

  • Project Quotation. Want to know the all components and cost for a project? Just contact EON or download, fill in, and return our Well Data Form. Click for our Well Data Form
  • Prepackaged Equilibrator Kits are fast and convenient. Each kit has 12 prefilled, 350 ml, Equilibrator PDBs, a DI water blank, sampler discharge straws, and zip ties. Need it fast? Order by the Kit!

Contact EON for application and service assistance.

 Item # Description/Size Availability Qty Breaks Price Quantity
GSD200-PF1-K
KIT: 12 each Equilibrator Passive Diffusion Sampler (PDB), Prefilled with ASTM Type 1 Deionized Water; 18in x 1.75in 350 ml., 1 DI Water Blank, Discharge Straws (GSD290) and Zip-Ties (FSF105) are included.
In Stock 1 $313.65
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
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
To add an item to your cart check the item then click the Add To Cart button at the bottom.
Custom Tether Manufacturing Service
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Locking Cap, T-cap 2in w/ring
Price: $10.50
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Locking Cap, T-cap 4in w/ring
Price: $11.80
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Rope, Poly Braid 3/16inx 50ft
Price: $3.55
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Rope, Poly Braid 3/16inx1000ft
Price: $19.75
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Snap Connector, Plastic
Price: $1.50
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Cable tie, 4in black nylon
Price: $0.05
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Ring, Split 1in SST
Price: $0.50
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Weight-SST 1.5in Diam 8 oz
Price: $15.00
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Weight-SST X-Hvy1.5inDiam 20oz
Price: $19.50
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Weight- SST Inline XHvy 1.5in
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Why Use the EquilibratorTM?

  • 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

EquilibratorTM 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!

Assembly & Deployment Information

Technical Documents

Passive Diffusion Sampler Case Studies & Technical Papers

  • Bunnell-Lammons Engineering Study (1998) - Report produced by Andrew Alexander and Thomas Lammons titled "Field Trial of a New Commercially Available Diffusive Ground-Water Sampler". (Equilibrator introduced in study)
  • McClellan Air Force Base (2001) - A recent study that compares cost, ease of use, and analytical results of samples collected by diffusion sampling and low-flow methods. (Equilibrator shown effective)
  • USGS/EPA Guidance Document (2001) - Federal and State Agencies publish a Guidance Document for the use of Passive Diffusion Sampling.
  • ITRC Final Report (2002) - Inter-State Technical Regulatory Council publishes "Recommendations on the Use of Polyethylene Diffusion Bag Samplers for Long Term Monitoring of Volatile Organic Compounds in Groundwater".
  • ITRC Tech-Reg Document (2004) - Inter-State Technical Regulatory Council publishes "Technical and Regulatory Guidance for Using Polyethylene Diffusion Bag Samplers to Monitor Volatile Organic Compounds in Groundwater." This is an aid to regulators and users to determine the applications and use of PDBs.
  • PowerPoint Presentation - A PowerPoint Presentation with basic information in graphical format describing the technical basis, applications, configuration and installation of PDBs in graphical format.

USEPA Region 4 No-Purge Sampler Use Criteria

  • SESDPROC-301-R2 10-28-11.pdf - U.S Environmental Protection Agency Science & Ecosystem Support Division Athens, Georgia Operating Procedure for Groundwater Sampling includes reference to the conditions to consider for acceptable for use of passive samplers.