HORIBA 0030-10D Needle-Type ISFET pH Electrode

Overview

The HORIBA 0030-10D is a precision-engineered needle-type ion-sensitive field-effect transistor (ISFET) pH electrode designed for demanding electrochemical measurement environments where mechanical robustness, rapid response, and surface-compatible sampling are critical. Unlike conventional glass membrane electrodes, the 0030-10D employs a solid-state silicon sensor architecture that eliminates fragile glass components while maintaining NIST-traceable pH accuracy across the full 0–14 range. Its operational principle relies on the modulation of drain-source current in a chemically functionalized gate dielectric layer upon proton adsorption—enabling direct, label-free potentiometric pH detection without liquid junction potential drift. Engineered specifically for low-volume, non-immersive, and semi-solid applications—including microdroplets, gel surfaces, pharmaceutical tablet coatings, food product skins, and biofilm interfaces—the electrode delivers high reproducibility (< ±0.02 pH unit repeatability at 25 °C) and long-term stability under intermittent use conditions.

Key Features

• Flat-ended needle tip geometry with sub-100 µm gap between sensing surface and reference sleeve—enables capillary-scale moisture detection on solid or semi-solid substrates without air bubble entrapment.
• Patented rare-earth-doped gate oxide layer enhances proton exchange kinetics, reducing response time (t_95%) to ≤1.5 seconds in buffered solutions—approximately 50% faster than legacy ISFET designs.
• Ion-selective hollow-fiber reference junction minimizes Ag⁺ leaching by >99.9% versus conventional double-junction systems, ensuring stable reference potential and eliminating electrolyte depletion artifacts over extended operation.
• Dry-storage compatibility: No requirement for aqueous storage solution; maintains calibration integrity after ≥72 hours of ambient desiccation (20–25 °C, RH < 40%).
• Enhanced mechanical resilience: Tip hardness exceeds JIS Z 8802 requirements by >10×; withstands repeated contact with stainless steel, ceramic, and polymer surfaces without microfracture or gate passivation loss.
• Integrated electrostatic discharge (ESD) protection circuitry compliant with IEC 61340-5-1, mitigating sensor failure risk in low-humidity laboratories or automated handling systems.

Sample Compatibility & Compliance

The 0030-10D is validated for use with low-conductivity aqueous media (≥5 µS/cm), viscous gels, emulsions, and hydrated solid-phase matrices—including agar plates, hydrogel wound dressings, and lyophilized protein formulations. It is not recommended for strongly oxidizing or highly fluorinated solvents (e.g., HF, anhydrous acetonitrile). The electrode meets functional equivalence to ISO 7888 (electrochemical pH measurement) and supports audit-ready documentation per FDA 21 CFR Part 11 when paired with HORIBA’s LAQUA Smart software (v4.2+). Its design facilitates compliance with USP for non-aqueous titration support and EP 2.2.3 for surface pH mapping in pharmaceutical manufacturing.

Software & Data Management

When connected via HORIBA’s LAQUA Twin or LAQUA Smart interface modules (USB/Bluetooth), the 0030-10D provides real-time temperature-compensated pH output with automatic slope/offset validation logs. Firmware v2.1+ enables timestamped calibration history export (CSV/Excel), GLP-compliant electronic signatures, and configurable alarm thresholds for out-of-specification drift detection. Raw ISFET drain-current data is accessible for advanced users performing custom drift-correction modeling or multivariate surface analysis.

Applications

• Surface pH profiling of transdermal patches, oral thin films, and coated tablets during stability testing.
• In-process monitoring of fermentation broth surface acidity in bioreactor headspace sampling.
• Quality control of edible films, cheese rinds, and fruit cuticle integrity assessment.
• Micro-environmental pH mapping in microfluidic organ-on-chip devices and 3D bioprinted tissue constructs.
• Field-deployable soil moisture–pH correlation studies using minimal sample displacement.

FAQ

Can the 0030-10D be used in non-aqueous solvents?

No—this electrode is optimized for aqueous and aqueous-miscible systems with conductivity ≥5 µS/cm. Use model 6377-10D for low-conductivity or non-polar media.
Does it require recalibration after dry storage?

Calibration stability is maintained for up to 72 hours post-dry storage; however, a two-point calibration (pH 4.01 and 7.00) is recommended before critical measurements.
Is the electrode compatible with third-party meters?

Yes—when equipped with a BNC or DIN connector adapter (sold separately), it interfaces with any pH meter supporting high-impedance ISFET input (≥10¹² Ω input impedance).
What is the expected service life under routine QC use?

Typical operational lifespan exceeds 18 months with daily use and proper cleaning (soft-bristled brush + deionized water rinse); gate oxide degradation is the primary wear mechanism.
Can multiple HORIBA electrodes be operated simultaneously on one meter?

No—simultaneous connection of multiple HORIBA electrodes may induce cross-talk due to shared reference path architecture; only one electrode should be active per measurement channel.