Model 425 Discrete Interval Sampler Overview - GroundwaterSoftware.com
Model 425 Discrete Interval Sampler
Operating Pressures and Sampler Capacities
Model 425 Discrete Interval Sampler Overview - GroundwaterSoftware.com
- High quality, discrete zone samples
- Sample profiling of wells or open bodies of water
- Easy operation and transportation
- No mixing of water from different levels
- Avoids purging and disposal of purged water
Available from GroundwaterSofware.com, the Model 425 Discrete Interval Sampler is a stainless steel groundwater sampler, with LDPE tubing mounted on a convenient reel. Discrete interval sampling is ideal for obtaining truly representative groundwater samples from below floating product layers, or for obtaining samples of the product itself. The Discrete Interval Sampler can also be used for sample profiling of open bodies of water, boreholes, and to collect samples from distinct levels or points of inflow. The Discrete Interval Sampler is a passive sampler that is pressurized when lowered and upon retrieval, to prevent water mixing at different levels. It is designed to give zero purge samples when sample profiling.
Model 425 Discrete Interval Sampler
1.66"" ø Discrete Interval Samplers with High Pressure Hand Pump
Available from GroundwaterSoftware.com, the Solinst Model 425 Discrete Interval Sampler (DIS) is a stainless steel sampler, with LDPE tubing mounted on the convenient Solinst reel. The reel has a pressure attachment for a high pressure hand pump, and a pressure/vent switch which is used to apply and release the pressure on the sampler. A sample release device is included with each Discrete Interval Sampler.
OperationThe sampler is pressurized before being lowered into the well to prevent water flowing into the sampler. Once the desired depth is reached, the pressure is released and hydrostatic pressure fills the sampler with water directly from the sampling zone. A floating checkball inside the 1.66""ø (42 mm) and 1""ø (25 mm)samplers prevents water from entering the tubing, thus avoiding the need to decontaminate the tubing. When the sampler is filled, it can be repressurized and raised to the surface. The sample is decanted using the sample release device, which regulates flow and minimizes degassing of the sample. The sampler is easily disassembled for decontamination. Biodegradable disposable PVC bailers and stainless steel Point Source Bailers are also available from Solinst (see Model 428 BioBailer & 429 Point Source Bailer Data Sheets).
Discrete Interval No-Purge SamplingDiscrete 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 for sample profiling of 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. The Model 425 Discrete Interval sampler is also recognized as a no-purge sampler. No-purge, also known as zero-purge or passive sampling methods, have gained acceptance by many regulatory agencies worldwide for obtaining high quality groundwater samples. These sampling methods are based on the principle that groundwater which flows into a well, maintains equilibrium with the adjacent water bearing unit. Sampling at the discrete interval should result in representative samples, without the need for purging when sample profiling.
Recommended Applications from GroundwaterSoftware.com
- 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
- High quality samples
- Sample has not been pumped through tubing
- No mixing of water from different levels
- Minimal disturbance of the water
- Easy disassembly for decontamination
- Avoids purging and disposal of purge water
- Less cost and time to retrieve samples
- Easy operation and transportation
The Solinst Model 122 Interface Meter quickly and easily detects water as well as floating or sinking product layers (LNAPL or DNAPL). Infra-red refraction is used to detect liquids and conductivity to distinguish water. A steady light and tone indicates product. Water is indicated by intermittent signals. Once an LNAPL or DNAPL layer is detected, a sample can be taken using the Model 425 Discrete Interval Sampler at the depth indicated on the Interface Meter flat tape (marked every 1/100 ft. or mm).
Discrete interval samplers are excellent for VOC sampling since there is no mixing with water from different levels in the well. The sample has minimal contact with air, and does not travel through a long length of tubing, risking loss of volatile organics.
Suspension Cable
A cable connector is included at the top of the sampler for easy connection to a suspension cable. The Solinst Model 103 Tag Line is ideal (also sold by GroundwaterSoftware.com). It uses polyethylene coated, permanently laser marked stainless steel, mounted on a reel. It comes with a clip for easy attachment/disattachment.
MaterialsSamplers are constructed of stainless steel with Viton® o-rings,Teflon® and polypropylene check balls. Tubing most commonly used is low density polyethylene (LDPE), however, Teflon or Teflon-lined polyethylene tubing is also available.
Depth CapabilityThe Solinst Discrete Interval Sampler can sample to depths of 500 ft. (150 m) below water level, regardless of total depth from surface.
Operating Pressures and Sampler Capacities
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