The Discrete Interval Sampler (DIS) allows samples to be taken from distinct levels within a well. The sampler is pressurized at the surface to prevent water from entering the device as it is being lowered to the desired sampling depth. The pressure is then released allowing the Discrete Interval Sampler to fill under hydrostatic pressure. The Discrete Interval Sampler is repressurized to maintain chemical stability of the sample as the DIS is retrieved. At the surface, the sample is removed using the Sample Release Device.
Using High Operating Pressures can be Dangerous
For sampling at depths greater than 200 ft. (60 m) below water level use the following method to increase safety.
Before Sampling: Pressurize the sampler to 100 psi (700 kPa) then lower the sampler to a depth of about 160 ft. (50 m) below water.
At that level increase the pressure to the maximum required, as determined when setting the operating pressure. Then lower the sampler to the appropriate level and continue as per the operating instructions.
After Sampling: Raise the sampler to a depth of about 160 ft. (50 m) below water, then decrease the pressure on the sampler to 100 psi (700 kPa). Continue to raise the sampler and follow the instructions to properly remove the sample.
|Recommended Operating Pressure|
|Pressure psi||Depth (m)
|Discrete Interval Sampler Size & Capacity Options|
|1" x 2 ft.||6 oz||25.4 mm x 610 mm||175 ml|
|1.66" x 2 ft.||15 oz||38 mm x 610 mm||450 ml|
|2" x 2 ft.||27 oz||50.8 mm x 610 mm||800 ml|