BAT Groundwater Sampler (#5-100)

The BAT Groundwater Sampler - Envirosampler® - is ideal for quick, discrete sampling of both liquid and gas phases at specific depths. All elements of the BAT System, including the encapsulated samples, are hermetically sealed, preventing loss of volatile sample components. The BAT Envirosampler® integrates field operations with laboratory techniques. 

BAT Groundwater Sampler major advantages

  • Minimal external influence. The sample is hermetically sealed at the level of sampling with sustained in-situ conditions.
  • Near zero hydraulic lifting height enables sampling at great depths.
  • High repeatability and long term stable sampling.

The BAT Envirosampler® contains three basic components:

  • BAT MkIII Filter Tip - installed at the sampling depth and attached to a 1"-extension pipe
  • An evacuated sample collection tube
  • A double-ended injection needle

Both the filter tip and the sample tube are sealed with a flexible septum. Sample volume
varies between 35ml up to 85ml in the standard version.

Sampling procedure 
The sample tube is inserted into a sampler housing which also is equipped with a holder for the double-ended needle. The sampler is lowered down the extension pipe onto the BAT Filter Tip and simply by gravity the double-ended needle penetrates both the septum in the filter tip and the septum of the sample tube. A temporary, leak-proof connection is thus established between the sample tube and BAT Filter Tip. 

Due to the action of both the groundwater pressure and the suction in the sample tube, groundwater and/or soil gas will be drawn into the sample tube. Upon lifting the BAT Envirosampler® the flexible septa in both the filter tip and the sample tube will automatically reseal. The liquid and/or gas sample is thereby kept hermetically sealed all the way from the point of sampling into the laboratory. 

Experience & references 
The US-EPA and other high conformance requirement groups have adopted the BAT technology as appropriate and preferred for many environmental characterization applications. The repeatability of the data is cited as one key reason for this reference. BAT technology has also been scrutinized by many other investigators, and has met with widespread acceptance.