WTW pH Accessories and Consumables

Overview

WTW pH Accessories and Consumables are engineered to support the precision, reliability, and regulatory compliance of WTW’s intelligent digital sensor (IDS) platform—including SensoLyt® 900, TetraCon® 925, FDO® 925/926, and other IDS-compatible pH, conductivity, and dissolved oxygen measurement systems. These accessories and consumables are not generic replacements but purpose-built components designed for traceable calibration, long-term electrode stability, and robust field operation. All WTW TEC-certified pH buffer solutions undergo rigorous metrological validation against NIST-traceable reference standards and conform to DIN 19266 and ISO 3696 (Grade 2 water purity), ensuring consistency across laboratories, wastewater treatment plants, pharmaceutical manufacturing, and environmental monitoring facilities. The pH electrodes and associated calibration reagents operate within a certified accuracy of ±0.01 pH at 25 °C—enabling high-fidelity process control and GLP/GMP-compliant data integrity.

Key Features

• Traceable calibration standards: All TEC-certified buffers are individually labeled with batch-specific uncertainty values and full NIST/DIN traceability documentation.
• Ultra-stable formulation: Buffers contain no preservatives and are sterilized via validated steam autoclaving (SUS 316L-compatible), supporting up to 5 years of shelf life when stored unopened at 15–25 °C.
• QSC (Quality Sensor Check) Initial Calibration Kit: Includes three single-use ampoules (pH 4.01, 6.86, 9.18) with ±0.01 pH tolerance at 25 °C—optimized for first-time IDS electrode commissioning and drift verification.
• Dual-format packaging: Available in laboratory-grade 50 mL, 250 mL, and 1 L bottles; multi-pack configurations (10×, 25×) reduce handling frequency and contamination risk in high-throughput environments.
• Field-hardened protection housings: Stainless steel (A 925/S) and POM polymer (A 925/K) sensor guards extend pressure rating and mechanical durability for submersible or abrasive applications—compatible with IDS probes rated to IP68 and 10 bar.

Sample Compatibility & Compliance

WTW pH accessories maintain full compatibility with all IDS-enabled instruments (e.g., Multi 9630 IDS, inoLab® pH 7310 IDS, OxiTop® Control SC). Buffer solutions meet ASTM D1293 (Standard Test Method for pH of Water), USP <791> (pH Measurement), and EU Pharmacopoeia 2.2.3 requirements. The QSC kit satisfies FDA 21 CFR Part 11 audit trail prerequisites when used with WTW LabX® software. All stainless-steel housings comply with EN 10088-1 (corrosion resistance) and are suitable for clean-in-place (CIP) and steam-in-place (SIP) validation protocols in biopharmaceutical settings.

Software & Data Management

When paired with WTW LabX® or inoLab® Smart software, these consumables integrate seamlessly into electronic lab notebooks (ELN) and LIMS workflows. Each buffer lot number and QSC ampoule serial code is scannable via QR code for automatic metadata capture—including calibration date, operator ID, instrument ID, and temperature-compensated pH reading. Audit trails include timestamped entries, user authentication logs, and change history—fully compliant with GLP, GMP, and ISO/IEC 17025 documentation requirements.

Applications

• Pharmaceutical water system monitoring (PW, WFI, Purified Water per USP <1231>)
• Environmental compliance testing (EPA Method 150.1, ISO 10523)
• Food & beverage quality assurance (HACCP-critical pH verification)
• Bioreactor and fermentation pH control with real-time IDS feedback
• Drinking water disinfection residual management (chlorine/pH coupling)
• Academic and industrial research requiring NIST-traceable electrochemical metrology

FAQ

Are WTW TEC buffers certified for ISO/IEC 17025 accredited labs?
Yes—each batch includes a Certificate of Analysis (CoA) with expanded uncertainty, reference standard traceability, and conformity statements aligned with ISO/IEC 17025:2017 Clause 6.6.
Can A 925/S stainless steel housings be autoclaved?
Yes—the A 925/S housing is rated for repeated steam sterilization at 134 °C / 3 bar for 18 minutes without dimensional or material degradation.
What is the shelf life of opened TEC buffer bottles?
Unrefrigerated: 3 months for 50 mL/250 mL formats; 6 months for 1 L bottles under nitrogen purge and capped storage. Refrigeration extends viability by ~50% but is not required.
Is QSC compatible with non-IDS WTW meters?
No—QSC is exclusively designed for IDS architecture and requires firmware v3.2+ and LabX® v4.5 or higher to decode ampoule-specific calibration parameters.
Do plastic (A 925/K) housings meet FDA 21 CFR 177.2470 compliance?
Yes—POM (polyoxymethylene) housing material is FDA-listed for repeated food contact and complies with EC 10/2011 for plastic materials in contact with foodstuffs.