Passive Sampling

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Passive Sampling

Low Flow or No Flow Sampling Solutions

Snap Sampler


Van Walt is the exclusive distributor of the Snap Sampler in the UK and Ireland. The Snap Sampler is suited for most groundwater monitoring and sampling situations and also especially helpful in difficult conditions such as with low yield wells.

The Snap Sampler seals groundwater samples down well, in bottles that can then be directly analysed in a laboratory. The sample is never exposed to the open air and collection of the sample does not require pumps, controllers, meters and purge water waste containers. It is quick and easy to collect the samples and so can save money on sample collection costs.

The Snap Sampler with 40ml and 125ml bottles fits in 2-inch or larger monitoring wells. With 350ml bottles the sampler will fit in 4-inch or larger monitoring wells.

Snap Sample bottles are loaded into the Snap Samplers, set open, deployed for a period of time — usually all the way between sampling events — are "snapped" shut downhole, retrieved, secured, and sent to a lab without opening them.


  • A non-purge device for passive sampling techniques
  • Simplified sampling process
  • Works on the principle of grabbing a sample rather than diffusion
  • Minimal or no disturbance of the water
  • Collects undisturbed sample
  • Less equipment, manpower and time required to collect samples
  • No waste disposal of purge water
  • Seals sample down well so no outside contamination of sample
  • Tests for any analyte
  • Collects sample from same depth for consistency of results
  • Reduced time to collect each sample
  • Samples up to 2 litres by stacking samplers
  • Improved Health & Safety with no lifting of heavy equipment and less time in potentially hazardous environments
  • Repeatable use of equipment
  • Green technology
  • Easy to use

Specifications: Snap Sampler

Input Power:
Pneumatic System: 12V Air Pump
Trigger Activating Pressure: 10-30 PSI (.69-2 bar) – typical
Pressure Block: Includes fittings and gauge for applying pressure from pump to pneumatic actuator
Snap Sampler Specifications
Maximum Operating Pressure1: 80 PSI (5.5 bar)
Minimum Operating Pressure1: ~10 PSI (~.69 bar)
Maximum Sampling Depth: 2,500 ft. (609 m)
Capacity: Up to 6 Snap Samplers in any combination can be "stacked" with one actuator
Operating Temperature: 0° to 100°C
Input Protection: Pressure Block has 80 PSI (5.5 bar) relief valve
40 ml Snap Sampler: 3 oz. (85 g) – each, empty
125 ml Snap Sampler: 3 oz. (85 g) – each, empty
Pneumatic Actuator: 13 oz. (368 g)
Stainless Steel Weight: 3.1 lb. (1.4 kg) – optional
40 ml Snap Sampler: 8 in.(20 cm)
125 ml Snap Sampler: 10.5 in. (26.7 cm)
Pneumatic Actuator: 11 in. (27.9 cm)
Outer Diameter:
40 ml Snap Sampler: 1.7 in. (4.3 cm)
125 ml Snap Sampler: 1.85 in. (4.7 cm) – with 125 ml bottle
350 ml Snap Sampler: 3.4 in. (8.6 cm) – with 350 ml bottle
Min. Well I.D:
40 ml Snap Sampler: 2 in. (5 cm)
125 ml Snap Sampler: 2 in. (5 cm)
350 ml Snap Sampler: 4 in. (10 cm)
Material: Acetal

Videos, Manuals & Downloads

Snap Sampler Assembly

Manual Trigger Assembly

Manual Trigger Disassembly

Pneumatic Trigger Assembly

Triggering Operation

Removing Bottles

VOA Vial Preparation

POLY Bottle Preparation

Snap Sampler Promo Video

EOS Remediation Webinar - March 12, 2015 Webinar Presented by Sandy Britt


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