ISCO 4700 Refrigerated Proportional Automatic Water Sampler

Overview

The ISCO 4700 Refrigerated Proportional Automatic Water Sampler is an engineered solution for regulatory-compliant, long-term unattended water sampling in municipal wastewater treatment plants, industrial effluent discharge points, and environmental monitoring stations. Designed around the principle of programmable, flow-proportional or time-based sample acquisition—combined with active refrigeration—it ensures sample integrity by maintaining temperatures ≤4 °C throughout collection and storage. Its core architecture integrates a high-reliability peristaltic pumping system, NEMA 4X/IP67-rated controller enclosure, and a thermally insulated LLDPE refrigerated cabinet capable of sustaining stable cold-chain conditions across ambient extremes from −29 °C to +49 °C. The instrument complies with U.S. EPA Method 1664 and ASTM D5118–22 guidelines for composite sampling protocols, supporting both discrete and composite (mixed) sampling strategies under GLP-aligned operational workflows.

Key Features

• Refrigerated cabinet with compressor-based cooling system: Maintains consistent sample temperature ≤4 °C; logs 24-hour temperature history with timestamped data export via HyperTerminal® or ISCO-compatible serial software.
• Dual-layer linear low-density polyethylene (LLDPE) housing: Provides corrosion resistance, UV stability, and thermal insulation—validated for deployment in coastal, industrial, and high-humidity environments.
• High-performance peristaltic pump: Delivers repeatable volumetric accuracy (±5% of mean volume or ±5 mL), supports lift heights up to 8.5 m, and sustains ≥0.6 m/s flow velocity in sample lines per U.S. EPA requirements.
• Non-contact liquid detection sensor: Compensates automatically for variable suction head and line resistance, eliminating false-triggering due to air pockets or low-flow conditions.
• Tool-free pump tube replacement: Integrated safety interlock cuts power during tube change; typical tube service life exceeds 1 million actuations.
• Flexible sampling logic: Supports three primary modes—time-proportional (fixed interval/fixed volume), flow-proportional (variable volume/time), and flow-triggered variable-interval sampling—with full programmability of retry attempts, pre-sample line flushing (1–5 cycles), and composite mixing (1–999 samples per composite).

Sample Compatibility & Compliance

The ISCO 4700 accommodates a wide range of container configurations—including 24 × 1 L polypropylene bottles, 24 × 350 mL borosilicate glass vials, 24 × 1 L wedge-shaped ProPak® disposable bags, and single-container options up to 20 L HDPE or glass. All bottle racks are slide-out for ergonomic access without bending or kneeling. The unit meets NEMA 4X and IP67 ingress protection standards, ensuring operational reliability in rain, dust, and splash-prone field installations. It accepts analog (4–20 mA) and pulse-based (dry contact or 5–15 V DC) flow meter inputs, enabling seamless integration with existing flow measurement infrastructure. Data logging and alarm outputs support audit-ready reporting under ISO/IEC 17025 and EPA-approved QA/QC frameworks.

Software & Data Management

The embedded controller features non-volatile memory for program retention during power loss and includes real-time clock accuracy of ±1 minute per month. Sampling parameters—including frequency (1 min to 99 h 59 min), volume (10–9990 mL in 1 mL increments), and flow-pulse thresholds (1–9999 pulses)—are configured via intuitive ASCII command sets over RS-232. Temperature log files and event histories (e.g., pump activation, alarm triggers, door openings) are exportable as CSV or plain-text files for traceability. While the device does not natively support FDA 21 CFR Part 11 electronic signature functionality, its deterministic behavior, tamper-evident logging, and external audit trail compatibility make it suitable for laboratories operating under GLP or GMP-aligned quality systems.

Applications

• Wastewater influent/effluent monitoring at publicly owned treatment works (POTWs)
• Industrial pretreatment compliance sampling per 40 CFR Part 403
• Combined sewer overflow (CSO) and sanitary sewer overflow (SSO) event characterization
• Stormwater outfall monitoring under NPDES permit requirements
• Groundwater plume tracking and leachate collection at landfill sites
• Research-grade composite sampling for nutrient, metal, or organic contaminant analysis (e.g., COD, BOD₅, TSS, PAHs)

FAQ

What refrigeration technology does the ISCO 4700 use?
It employs a high-efficiency hermetic compressor with R134a refrigerant and insulated LLDPE cabinet walls, achieving and maintaining ≤4 °C internal temperature across rated ambient conditions.
Can the ISCO 4700 operate on battery power?
No—the unit requires continuous AC input (120 V/60 Hz or 240 V/50 Hz); no internal battery or DC backup is provided.
Is remote configuration supported?
Yes—via RS-232 serial interface using terminal emulation software; no native Ethernet, Wi-Fi, or cellular telemetry capability is integrated.
How is calibration verified for volumetric accuracy?
Users perform periodic gravimetric checks using certified weights and distilled water; pump performance is validated against U.S. EPA-recommended tolerance limits (±5% of target volume).
Does the ISCO 4700 meet ISO 5667-10 requirements for automatic samplers?
While not formally certified to ISO 5667-10, its design principles—including flow-proportional sampling logic, temperature-controlled storage, and programmable diagnostics—align with the standard’s technical recommendations for representative sample acquisition.