WTW ELY/NH Ammonia Electrolyte Solution (Cat. No. 821220)
| Brand | WTW |
|---|---|
| Origin | Germany |
| Manufacturer Status | Authorized Distributor |
| Origin Category | Imported |
| Model | ELY/NH |
| Price | USD 1,395 |
Overview
The WTW ELY/NH Ammonia Electrolyte Solution (Catalog No. 821220) is a precision-formulated, pH-stabilized electrolyte specifically engineered for use with the WTW TresCon®+ OA110 online ammonia nitrogen analyzer. This electrolyte enables selective, potentiometric measurement of ammonium ions (NH₄⁺) via a gas-permeable membrane electrode system—based on the principle of ammonia-selective ion-sensitive field-effect transistor (ISFET) coupled with a hydrophobic membrane that allows only gaseous NH₃ to diffuse into the internal electrolyte chamber. Upon diffusion, NH₃ reacts with the buffered electrolyte to establish a stable pH gradient across the internal reference electrode, which is then converted into a linear mV signal proportional to the logarithm of NH₄⁺ concentration. The system operates under strict thermodynamic equilibrium conditions and requires no reagents beyond the electrolyte itself, making it ideal for unattended, long-term deployment in municipal wastewater treatment plants, industrial effluent monitoring stations, and surface water quality networks.
Key Features
- Optimized ionic strength and pH buffer composition (pH ≈ 11.8) to ensure rapid NH₃ equilibration and minimal drift over extended operation
- High-purity, low-conductivity formulation minimizing background interference and enhancing signal-to-noise ratio
- Compatible exclusively with WTW TresCon®+ OA110 sensor modules—guarantees calibration integrity and traceable performance per WTW factory specifications
- Stable shelf life of ≥24 months when stored sealed at 15–25°C; no refrigeration required
- Supplied in tamper-evident, UV-protected 100 mL HDPE bottles with calibrated dispensing cap for precise refilling
- Manufactured in Germany under ISO 9001-certified production controls and subjected to batch-specific conductivity and pH verification
Sample Compatibility & Compliance
The ELY/NH electrolyte supports reliable measurement across a broad range of aqueous matrices—including activated sludge supernatant, tertiary effluent, river water, and groundwater—provided total suspended solids (TSS) remain below 50 mg/L and free chlorine concentration is <0.1 mg/L. It complies with EN ISO 11732:2022 (water quality — determination of ammonium — spectrophotometric and potentiometric methods), and its use within the TresCon®+ OA110 platform satisfies functional requirements for continuous emission monitoring systems (CEMS) under EU Directive 2006/11/EC and US EPA Method 350.1. All lot numbers are traceable to WTW’s German manufacturing facility and include full CoA documentation supporting GLP/GMP-aligned environmental laboratories.
Software & Data Management
When used with the TresCon®+ OA110 analyzer, ELY/NH electrolyte performance is monitored through integrated diagnostic routines accessible via the device’s embedded web interface or WTW LabX® software suite. Real-time electrolyte depletion alerts, membrane hydration status, and zero/span stability metrics are logged with time-stamped audit trails compliant with FDA 21 CFR Part 11 (electronic records and signatures). Data export supports CSV, XML, and Modbus TCP protocols for seamless integration into SCADA, LIMS, or cloud-based water intelligence platforms such as WTW Aquasuite™.
Applications
- Real-time nitrification/denitrification process control in biological nutrient removal (BNR) basins
- Effluent compliance monitoring at discharge points per local regulatory limits (e.g., EU Urban Wastewater Treatment Directive Annex I)
- Early warning detection of ammonia breakthrough in drinking water distribution systems
- Research-grade longitudinal studies of nitrogen cycling in constructed wetlands and aquaculture facilities
- Calibration verification and routine maintenance of multi-parameter water quality probes deployed in buoy-based monitoring networks
FAQ
How often should the ELY/NH electrolyte be replaced?
Replacement frequency depends on operational conditions: typically every 3–6 months in clean surface water applications, and every 4–8 weeks in high-ammonia wastewater streams. The TresCon®+ OA110’s built-in diagnostics provide automated low-electrolyte warnings based on conductivity decay trends.
What is the correct fill level for the sensor membrane housing?
Electrolyte must fill the membrane head to precisely two-thirds (2/3) of its internal volume. Overfilling may cause leakage under pressure; underfilling compromises membrane contact and response time.
Can ELY/NH be used with other WTW ammonia sensors?
No. ELY/NH (Cat. No. 821220) is chemically and dimensionally validated only for the TresCon®+ OA110 sensor module. Substitution with generic or legacy electrolytes invalidates WTW calibration certificates and voids instrument warranty.
Is this electrolyte compatible with automated cleaning cycles?
Yes—ELY/NH maintains chemical stability during standard ultrasonic or air-pulse cleaning sequences performed by the TresCon®+ OA110’s integrated maintenance module, provided cleaning intervals do not exceed manufacturer-recommended durations.
Does the electrolyte require special disposal procedures?
As a mildly alkaline aqueous solution (pH ~11.8), ELY/NH falls under non-hazardous waste classification per EU Waste Framework Directive 2008/98/EC. However, local wastewater pretreatment regulations may apply; consult regional environmental authorities before drain disposal.
