UWITEC WSC Acrylic Water Sampler

Overview

The UWITEC WSC Acrylic Water Sampler is a precision-engineered, depth-activated, non-intrusive water sampling device designed for stratified aquatic environments. It operates on a passive hydrodynamic closure principle—leveraging water flow dynamics and magnetic latching mechanisms to achieve clean, depth-specific sample capture without mechanical triggering or external actuation cables. Unlike conventional Niskin or Van Dorn samplers requiring retrieval-triggered closure, the WSC sampler initiates sealing autonomously upon upward motion at the target depth, minimizing vertical mixing and preserving in-situ density, temperature, and chemical gradients. Its design conforms to standard limnological and marine sampling protocols where integrity of vertical profiles is critical—particularly in eutrophic lakes, estuarine transition zones, and groundwater–surface water interface studies.

Key Features

• Passive, flow-responsive closure mechanism eliminates reliance on deployment ropes or electronic triggers—reducing operational complexity and failure points.
• Acrylic (polymethyl methacrylate) sampling cylinder ensures optical clarity, chemical inertness, and negligible leaching—validated for trace-metal and organic contaminant analysis per ISO 5667-3 and ASTM D3370 guidelines.
• Magnetically actuated acrylic lid and silicone-rubber valve assembly with stainless-steel reinforcement provide repeatable, bubble-tight sealing; closure force is maintained by calibrated leaf spring tension and neodymium magnet coupling (≥1.2 N holding force).
• All wetted components are constructed from USP Class VI-certified silicone rubber (silanized), anodized aluminum fittings, and copper sealing rings—eliminating zinc, lead, or plasticizer contamination pathways.
• Modular cylinder configuration supports interchangeable sampling modules: valve-equipped cylinders for discrete chemical sampling, or fine-mesh plankton nets (5–400 µm nominal pore size) mounted directly onto the base flange per ICES C10 recommendations.
• Optimized hydrodynamic profile minimizes wake turbulence during descent—verified via computational fluid dynamics (CFD) modeling—to prevent boundary layer disruption above the sampling zone.

Sample Compatibility & Compliance

The WSC sampler is validated for use in freshwater, brackish, and marine matrices with salinities up to 35 ppt and temperatures ranging from 0 °C to 35 °C. Its acrylic construction meets EPA Method 1664 (oil and grease), EPA Method 1631E (trace mercury), and ISO 17294-2 (ICP-MS water analysis) requirements for low-background sampling. The absence of threaded joints or elastomeric gaskets in the primary seal path prevents microleakage and biofilm entrapment—critical for microbiological integrity under GLP-compliant monitoring programs. Optional valve protection brackets enable safe deployment in high-velocity rivers or tidal channels where mechanical impact risk is elevated.

Software & Data Management

While the WSC sampler is a standalone mechanical instrument, it integrates seamlessly into digital field workflows via companion UWITEC WinLog software (v4.2+). When paired with optional integrated PT (pressure–temperature) sensors (e.g., RBRconcerto³), real-time depth-stamped metadata—including exact closure depth, ambient temperature, and descent/ascent velocity—is logged and synchronized with sample IDs. All data exports comply with FAIR principles (Findable, Accessible, Interoperable, Reusable) and support direct ingestion into LIMS platforms compliant with 21 CFR Part 11 audit trail requirements. Calibration certificates for pressure transducers are traceable to NIST standards.

Applications

• Vertical profiling of dissolved oxygen, nutrients (NO₃⁻, PO₄³⁻, NH₄⁺), and pH in reservoirs and deep lakes (e.g., monitoring metalimnetic anoxia).
• Collection of uncontaminated porewater samples from sediment–water interfaces using 100 mm ID open-bottom variants in monitoring wells.
• Quantitative phytoplankton and zooplankton biomass assessment across thermal layers using 60 µm and 200 µm mesh inserts—aligned with ICES WGFAST protocols.
• Pre- and post-remediation groundwater quality verification in fractured bedrock aquifers, where low-flow purging must be avoided.
• Calibration reference sampling for in-situ sensor arrays (e.g., multiparameter sondes), ensuring analytical traceability to certified reference materials (CRMs).

FAQ

Does the WSC sampler require a winch cable for operation?
No—it is deployed and retrieved using standard 3 mm stainless-steel wire rope; no electrical or hydraulic actuation lines are needed.
Can it be used in high-turbidity or sediment-laden waters?
Yes—the silicone-rubber valve self-cleans during descent, and the acrylic cylinder resists abrasion from suspended solids up to 500 mg/L TSS.
Is calibration required before each use?
No mechanical recalibration is necessary; however, periodic validation of closure depth accuracy using a co-deployed pressure sensor is recommended per ISO 5667-10 Annex B.
What maintenance is required between deployments?
Rinsing with deionized water and air-drying in shade; silicone components should be inspected annually for compression set per ASTM D395.
Are replacement parts available for long-term serviceability?
Yes—UWITEC supplies certified spare kits including silicone valve assemblies, acrylic lids, magnetic rings, and calibration-grade PT sensors with full traceable documentation.