High Temperature PH&ORP Sensor Wholesaler & Pricelist for the New Zealand Market

The Physics of High-Temperature Glass Degradation

Standard pH glass membranes are prone to "alkaline error" (sodium ion interference) and accelerated glass dissolution at temperatures exceeding 60°C. For every 10°C rise in process media temperature, the chemical rate of glass leaching doubles (following Arrhenius kinetics). In caustic CIP solutions at 85°C, an ordinary electrode’s hydrated gel layer dissolves within weeks, resulting in sluggish response times, depressed slope values (<90%), and inaccurate alkaline readings.

Our Engineering Solution: BOQU high-temperature sensors employ a proprietary lithium-bearing glass matrix formulated with rare earth oxides. This formulation exhibits an extremely dense silica network that resists alkali attack up to pH 14 and operating temperatures up to 130°C continuously, maintaining theoretical Nernstian slope integrity across extended operational runs.

Reference Junction Depletion & Sulfide Poisoning

The majority of pH sensor failures in geothermal, chemical pulp, and wastewater plants are not glass failures—they are reference electrode failures. In liquid-electrolyte or standard gel probes, high process temperatures cause thermal expansion that forces electrolyte out through the porous ceramic junction. During cooling cycles, process fluid is sucked backwards into the reference chamber ("breathing effect"). In geothermal brines or sulfurous processes, trace H₂S reacts instantly with Ag⁺ ions:

2 Ag⁺ + S²⁻ → Ag₂S↓ (Insoluble Black Precipitate)

Our Engineering Solution: We utilize a high-density, polymerized solid gel electrolyte saturated with KCl, pre-pressurized to 0.6 MPa, coupled with an open annular or PTFE ring junction. This design maintains outward positive pressure, eliminating back-diffusion and preventing reference clogging entirely.

Vertical Supply Chain Integration

Unlike European and American legacy brands that outsource sensor subcomponents, BOQU operates two dedicated facilities in Shanghai (Kangqiao and Lingang) spanning 4,632 m². From specialized glass blowing and lithium glass matrix melting to PCB surface-mount assembly, cable potting, and automated batch calibration, every step occurs in-house. This gives New Zealand procurement specialists lead times of 5 to 7 days for batch orders, avoiding the typical 8 to 16-week backorders seen from local tier-two suppliers.

China’s 1st Dedicated High-Temp Sensor Lab

Every sensor destined for high-temperature and pressurized duty is validated in our specialized high-temperature water quality sensor laboratory. Sensors undergo 48-hour accelerated aging protocols, pressure cycling up to 1.0 MPa, and thermal shock testing between 20°C and 130°C. Individual calibration certificates (NIST traceable) verify slope integrity, zero-point potential (Eo), and response symmetry before dispatch, ensuring plug-and-play field readiness across New Zealand industrial plants.

Tailored OEM/ODM & Direct Wholesaler Margins

For system integrators, panel builders, and specialized instrumentation distributors in Auckland, Christchurch, and Wellington, we offer full private-labeling options. Modify sensor insertion lengths (120mm, 225mm, 325mm, 425mm), select custom process connections (PG13.5, 3/4" NPT, sanitary Tri-Clamp, or retractable ball-valve assemblies), and customize temperature compensation elements (Pt100, Pt1000, NTC 10K). By sourcing factory-direct, New Zealand distributors capture gross profit margins between 45% and 65%.