Wholesale Ultra Pure Water Environment Ph Electrode Wholesaler & Pricelist

Pure water lacks mobile buffering ions. Two main factors cause reading drift: First, the reference junction experiences severe liquid junction potential fluctuations as concentrated KCl electrolyte diffuses into low-conductivity water. Second, turbulent flow creates static electric charges (streaming potential). BOQU resolves this by pairing low-resistance glass with a constant-leak positive-pressure sleeve junction and an electrically grounded 316L stainless steel sample chamber conforming to ASTM D5128.

The ideal flow rate across the electrode glass bulb is strictly between 50 and 150 mL/min in a sealed bypass flow block. The fluid must enter from the bottom and exit from the top to prevent micro-bubble entrapment on the glass surface. The sample line must never discharge open to air upstream of the electrode because atmospheric carbon dioxide (CO2) absorbs instantly into pure water, forming carbonic acid and artificially driving pH down toward 5.5–5.8.

In ultra-pure water service, electrodes should be checked every 4 to 8 weeks. Calibration must be carried out using high-purity NIST buffers (pH 4.01, 7.00, or 9.21). When removing the sensor from pure water and placing it into concentrated buffer, allow at least 5 minutes for the reference junction to equilibrate before recording the calibration slope. Transmitters should register a slope between 95% and 102% of theoretical Nernstian response (59.16 mV/pH at 25°C).

Yes. The BOQU IOT-485-pH series features an integrated micro-controller and RS485 transceiver. It outputs standard Modbus RTU protocol (holding registers for temperature-compensated pH, process temperature, and diagnostic raw mV) directly to any third-party PLC, DCS, SCADA, or IoT edge gateway operating on 12V or 24V DC power.

For standard catalog sensors (such as pH5806, BOQU-UPW-01, and IOT-485-pH), the MOQ is 5 units, with stock orders typically dispatching from our Shanghai warehouse within 48 to 72 hours via air freight (DHL, FedEx, UPS). Custom OEM projects (private labeling, custom cable molds, tailored Modbus firmware, or specialized process fittings) require an MOQ of 20–50 units with a production lead time of 10 to 14 business days.

Yes, OEM and ODM manufacturing accounts for over 45% of BOQU’s factory volume. We offer custom laser marking of client logos, customized part numbering, tailored cable lengths up to 50 meters, and mechanical connection options including standard NPT 3/4", PG13.5, Tri-Clamp sanitary flanges, and immersion brackets.