WTW Wpack/A111 Ammonia Nitrogen Reagent Delivery Kit

Overview

The WTW Wpack/A111 Ammonia Nitrogen Reagent Delivery Kit is a precision-engineered consumables package designed exclusively for integration with WTW’s online or laboratory-based ammonia nitrogen analyzers—particularly those utilizing photometric (e.g., salicylate or hypochlorite) or ion-selective electrode (ISE) measurement principles. This kit addresses a critical operational requirement in automated water quality analysis: consistent, pulse-free, and volumetrically reproducible reagent delivery via peristaltic pumping. In ammonia determination workflows, inaccurate reagent dosing directly compromises calibration stability, reaction stoichiometry, and ultimately measurement traceability to ISO 7150-1, ASTM D1426, or EPA Method 350.1. The Wpack/A111 ensures long-term hydraulic integrity of the fluidic path by eliminating common failure modes—including tube flattening, elastic fatigue, chemical swelling, and particulate-induced occlusion—thereby maintaining analytical repeatability across extended unattended operation cycles.

Key Features

• Two high-elasticity, chemically resistant peristaltic pump tubes manufactured from proprietary thermoplastic elastomer (TPE), engineered for >10,000 compression cycles without loss of rebound resilience or inner diameter consistency
• Three-meter lengths each of black and transparent UV-stabilized polytetrafluoroethylene (PTFE)-lined tubing—black tubing provides light shielding for photosensitive reagents (e.g., sodium salicylate), while transparent tubing enables visual flow verification and bubble detection
• Chemical compatibility validated against common ammonia assay reagents including sodium hydroxide (NaOH), sodium hypochlorite (NaOCl), phenol solution, and nitroprusside catalyst—resistant to concentrations up to 10% w/v at ambient temperatures
• Pre-assembled, dimensionally standardized reagent connectors (including Luer-lock and barbed fittings) fabricated from PEEK polymer to prevent leaching, hydrolysis, or torque-induced cracking during routine maintenance
• Kit supplied with lot-specific traceability documentation, including material compliance certificates (RoHS, REACH) and dimensional inspection reports per DIN EN ISO 9001:2015

Sample Compatibility & Compliance

The Wpack/A111 is validated for use with WTW’s IQ Sensor Net-compatible ammonia sensors (e.g., IDS Ammonium ISE probes) and laboratory photometers such as the Photolab® 6600 series when configured for NH₄⁺/NH₃ analysis. It supports sample matrices compliant with ISO 5667-3 for surface, ground, and wastewater sampling—covering pH ranges 6.0–9.5 and suspended solids ≤100 mg/L. All components meet EU Directive 2000/53/EC (ELV) and are certified free of SVHC substances per REACH Annex XIV. No component contributes extractables exceeding 0.5 µg/mL in aqueous extraction tests (per USP ), ensuring non-interference with low-concentration (<0.05 mg/L N) ammonia quantification.

Software & Data Management

While the Wpack/A111 is a hardware consumables kit, its deployment aligns with WTW’s digital ecosystem requirements. When used in conjunction with WTW’s multi-parameter controllers (e.g., pHoenix or OxiTop® SC), the kit supports audit-trail-enabled maintenance logging under FDA 21 CFR Part 11-compliant firmware versions (v3.2+). Replacement intervals for pump tubes and connectors are programmable within the device’s preventive maintenance scheduler, triggering automated alerts and timestamped event logs synchronized to the instrument’s internal clock—enabling GLP/GMP-compliant record retention for regulatory inspections.

Applications

• Continuous monitoring of ammonia nitrogen in municipal wastewater treatment plant influent, effluent, and nitrification/denitrification basins
• Compliance testing for discharge permits under EU Urban Wastewater Treatment Directive (91/271/EEC) and US Clean Water Act NPDES regulations
• Process control in industrial cooling towers and boiler feedwater systems where ammoniacal nitrogen indicates microbiological activity or corrosion inhibitor breakdown
• Research-grade nutrient profiling in limnological studies, aquaculture facility management, and environmental impact assessments
• Calibration verification and system performance checks per ISO/IEC 17025-accredited laboratory protocols

FAQ

What is the recommended replacement interval for the peristaltic pump tubes in the Wpack/A111 kit?

Under continuous operation at standard flow rates (0.5–2.0 mL/min), WTW recommends replacing both pump tubes every 3 months or after 720 operational hours—whichever occurs first—to maintain volumetric accuracy within ±2% tolerance.
Can the black and transparent tubing be interchanged between reagent lines?

No. Black tubing must be used for light-sensitive reagents (e.g., salicylate); transparent tubing is reserved for non-photosensitive streams (e.g., buffer or carrier solutions) to preserve assay specificity and eliminate photochemical degradation artifacts.
Are these components compatible with third-party ammonia analyzers?

The Wpack/A111 is dimensionally and chemically optimized for WTW instruments only. Interchangeability with non-WTW platforms is not validated and may compromise measurement integrity or void equipment warranties.
Does this kit include installation instructions or torque specifications for fittings?

Yes—each kit contains a multilingual (EN/DE/FR/ES) quick-install guide with calibrated torque values (0.35–0.45 N·m) for all connectors and pictorial alignment diagrams for pump head seating.