Supmea SUP-pH6002 Glass-Body Industrial pH Sensor

Supmea SUP-pH6002 Glass-Body Industrial pH Sensor

Standard plastic-body pH probes in wastewater and organic process streams frequently blind early because suspended greases and metal hydroxides seal off small, single-wick ceramic reference junctions. The SUP-pH6002 eliminates this failure mode by utilizing a large-surface-area annular PTFE (Teflon) liquid junction paired with a chemically inert glass outer tube. With an integrated PT1000 RTD directly in the shaft, it provides instantaneous temperature compensation to your transmitter, extending calibration intervals and protecting against measurement drift in high-fouling environments.

Why the Annular PTFE Junction Matters to Operators

Most industrial pH sensor failures are not failures of the glass measuring electrode; they are failures of the reference junction. When a single ceramic wick becomes coated in heavy sludge, oil, or chemical precipitates, the ionic path between the internal reference cell and the process liquid is severed. This causes the transmitter to display erratic readings, slow response times, or impossible calibration slopes.

The SUP-pH6002 utilizes a full-ring annular PTFE junction surrounding the pH glass bulb. PTFE is naturally hydrophobic and chemical-resistant, which dramatically reduces the adhesion of organic residues, fats, and industrial particulates. This large surface area ensures that even if a portion of the sensor is exposed to direct fouling, a stable electrical circuit is maintained with the reference system, drastically reducing the frequency of unscheduled maintenance.

Key Performance Specifications

• Integrated PT1000 Temperature Compensation: Eliminates the need for a separate thermowell or external temperature probe. The PT1000 RTD sits close to the measuring glass, providing the transmitter with high-resolution, low-drift temperature data for precise, real-time Nernst slope correction up to 100°C.
• Chemically Inert Glass Body: Unlike polymeric cases (such as ABS or polycarbonate) which can suffer from solvent swelling, chemical attack, or early thermal degradation, the borosilicate glass outer tube provides near-universal chemical compatibility and structural stability under high-temperature processes.
• Ag/AgCl Double-Junction Reference: Utilizes a robust silver/silver chloride reference system. The internal gel electrolyte and long-distance reference diffusion path protect the reference electrode against poisoning from sulfides, heavy metals, or halides present in aggressive wastewater.
• Industrial PG13.5 Process Connection: Designed with an international standard PG13.5 thread. This guarantees compatibility with existing industrial flow cells, bypass loops, immersion sheaths, and standard chemical process housings.
• 5-Metre Shielded Low-Noise Cable: Supplied with a high-integrity, low-noise shielded cable that prevents signal degradation and electromagnetically induced interference across the high-impedance pH measuring circuit.

Critical Field Installation & Maintenance Guidelines

To maintain metrological integrity and avoid early mechanical failures, field technicians must adhere to the following installation protocols:

• The 15° Oblique Angle Requirement: The sensor must always be installed at an angle of at least 15° relative to the horizontal plane (with the glass bulb pointing downwards). Never install the sensor horizontally or upside down. A horizontal orientation allows air bubbles to migrate to the tip, breaking the electrical connection between the internal buffer solution and the glass membrane, leading to false transmitter readings.
• Waterproofing Thread Connections: While the glass shaft is highly durable, the top connector is susceptible to moisture ingress. Technicians must use adequate thread seal tape (PTFE) on the PG13.5 threads during pipe or immersion installs to prevent process fluid from wicking up and short-circuiting the cable connection.
• Storage Best Practices: The glass measuring bulb and reference junction must remain hydrated. If removed from the process line, the sensor must be stored in the protective cap filled with 3.3 M KCl (potassium chloride) solution. Never store the sensor in distilled or deionised water, as this will rapidly leach ions from the glass membrane and permanently damage the electrode's response slope.

Technical Specifications