The 425 Discrete Interval Sampler produces representative water samples from areas beneath layers of floating product (LNAPL). Discrete interval sampling is a form of no purge sampling and is also ideal for obtaining product samples directly (DNAPL). Additionally, the 425 Discreet Interval Sampler can be used to profile open bodies of water, screened wells, and open boreholes. Passive samples can also be collected from distinct levels or points of inflow. By causing only negligible disturbance, the mixing of water from different levels is reduced to minimal levels.
With the 425 Discrete Interval Sampler, purging and purged-water disposal can be easily avoided. By passive sampling from a specific depth directly, the water collected is highly representative of the groundwater surrounding the well at that level.
Made from stainless steel, the Solinst Model 425 is highly durable and extremely reliable. LDPE tubing is mounted conveniently on the Solinst reel, which also features a pressure attachment. A high-pressure hand pump can be inserted into the attachment and used to apply and release pressure on the sampler. Sample-release devices are included with each Discreet Interval Sampler.
Before being lowered into the well, the sampler is pressurised with the high-pressure hand pump, preventing water from entering before the sampling zone is reached. Once at the appropriate depth this pressure is released and hydrostatic pressure fills the sampler with water from the proper sampling zone. Water is unable to enter the tubing because of a floating checkball located inside the passive sampler, making tubing decontamination unnecessary.
Once filled, the passive sampler is pressurised again and returned to the surface. Then, the passive is decanted by the sample-release device, which regulates flow and minimises degassing.
When a product layer is located on the surface of the sampling source, the 425 Discreet Interval Sampler is able to obtain samples that are uncontaminated by the upper layer, making it perfect for groundwater sampling.
The NEW 425-D Deep Sampling Discrete Interval Sampler can sample from submerged depths as much as 1200 m (4000 ft). The stainless steel sampler connects to the same convenient tubing reel as the standard 425. Operation follows the basic principles of hydraulics. The sealed sampler is pressurized at depth allowing water to enter. The sampler is vented and sealed before retrieval to surface, maintaining sample integrity.
Discrete interval sampling is ideal for obtaining truly representative water samples and for obtaining samples of product (LNAPL and DNAPL). The DIS is ideal for groundwater sampling from below an oil/product layer on the surface of the water, as it allows a sample to be obtained which is untouched by the oil.
Discrete Interval Sampling is also used to profile open bodies of water, open boreholes and screened wells, and to collect samples from distinct levels or points of inflow. Mixing of water from different levels in the well is minimized.
Manufactured by: Solinst
Model: Solinst Discrete Interval Sampler for Groundwater (Model 425 & 425-D)
Obtaining a representative groundwater sample from below oil/product layers
Discrete interval sampling in lakes, rivers and wells
Chemical profiling of wells
Sampling at points of inflow to well
LNAPL and DNAPL sampling
|Recommended Operating Pressure|
|Operating Pressure = (Submerged Depth in feet x 0.43) + 10 psi
(Submerged Depth in meters x 9.8) + 70 kPa
|Discrete Interval Sampler Capacity|
|English Units||Metric Units|
|1" x 2'||6 oz||25.4 mm x 610 mm||190 ml|
|1.66" x 2'||18 oz||42 mm x 610 mm||475 ml|
|2" x 2'||27 oz||50.8 mm x 610 mm||800 ml|
|1" x 4'||12 oz||25.4 mm x 1220 mm||365 ml|
|1.66" x 4'||32 oz||42 mm x 1220 mm||1000 ml|
|2" x 4'||61 oz||50.8 mm x 1220 mm||1800 ml|
|Other diameters and lengths available, on request.|
|425-D Recommended Operating Pressure and Weights|
|Number of Weights|
|The 1.66” ø x 2' (42 mm x 610 mm) Deep Sampling DIS has a capacity of 420 ml (14 oz). Sampling at deeper depths may be possible, contact Solinst to determine the suitability of your application.|