GreenPrima Bsens120/120T Industrial pH Electrode for Wastewater and Online Water Quality Monitoring

Overview

The GreenPrima Bsens120/120T is a high-performance, gel-filled combination pH electrode engineered for continuous, reliable measurement in demanding industrial water and wastewater applications. Designed using Couette-flow-compatible glass formulation and an integrated AH-type spherical glass membrane, the sensor delivers exceptional chemical resistance and long-term stability across extreme pH ranges (−2 to 16). Its dual-junction reference system minimizes contamination from sulfides, heavy metals, and high-conductivity matrices commonly found in municipal effluents, landfill leachate, and chemical process streams. Unlike conventional liquid-filled electrodes, the polymer-based gel electrolyte eliminates leakage, reduces maintenance frequency, and ensures consistent junction potential—critical for unattended operation in online automatic water quality monitoring systems compliant with ISO 5667-3, EN 27888, and EPA Method 150.1.

Key Features

• Robust AH-glass spherical sensing bulb optimized for rapid response and low drift in aggressive media including acidic mine drainage and caustic alkaline waste streams
• Gel-filled dual-junction reference system with KCl-saturated polymer matrix, preventing clogging and electrolyte depletion under high-suspended-solid conditions
• Pressure-rated construction (up to 3.5 bar) enabling direct insertion into pressurized pipelines, aeration tanks, and inline treatment units without auxiliary housings
• PG13.5 threaded mounting interface ensures IP68-rated mechanical sealing and vibration-resistant installation in pump stations and clarifiers
• Temperature-compensated output compatible with standard 2-wire or 4-wire pH transmitters meeting IEC 61508 SIL2 functional safety requirements
• No field refilling required; service life extended up to 18–24 months in continuous operation per ASTM D1293 validation protocols

Sample Compatibility & Compliance

The Bsens120/120T demonstrates proven compatibility with heterogeneous aqueous matrices: activated sludge, digester supernatant, reverse osmosis reject, cooling tower blowdown, and electroplating rinse waters. Its chemically inert glass body resists attack from chlorine, hydrogen peroxide, and low-molecular-weight organic acids. The electrode conforms to CE marking directives (2014/30/EU EMC and 2014/35/EU LVD), carries RoHS 2011/65/EU certification, and supports GLP-compliant data integrity when paired with FDA 21 CFR Part 11–enabled controllers. It is validated for use in ISO/IEC 17025-accredited environmental testing laboratories performing routine compliance monitoring per EU Directive 2000/60/EC (Water Framework Directive).

Software & Data Management

While the Bsens120/120T is an analog sensor element, it integrates seamlessly with industry-standard SCADA platforms—including Siemens Desigo CC, Honeywell Experion PKS, and ABB Ability™—via 4–20 mA or RS-485 Modbus RTU outputs. When used with GreenPrima’s optional SmartTransmitter ST-200 series, real-time diagnostics (junction impedance, glass impedance, asymmetry potential) are logged with timestamped audit trails supporting ISO 9001 traceability. Firmware-upgradable transmitter modules provide configurable alarm thresholds, auto-calibration scheduling (ASTM D1293 Annex A2), and linearization algorithms that compensate for temperature-induced nonlinearity beyond ±0.003 pH/°C.

Applications

• Continuous pH monitoring in primary and secondary wastewater treatment plants (influent, aeration basins, final effluent)
• Neutralization control loops for acid/alkali dosing systems in industrial pretreatment facilities
• Real-time process feedback in anaerobic digesters and membrane bioreactors (MBRs)
• Regulatory compliance reporting for NPDES permits and local discharge consent agreements
• Leachate pH trending at landfill containment sites per EPA SW-846 Method 9040C
• Calibration verification standards traceable to NIST SRM 186c and BAM pH buffer solutions

FAQ

What distinguishes the Bsens120T variant from the Bsens120?
The Bsens120T includes an integrated Pt1000 temperature sensor (IEC 60751 Class B) co-located with the pH element, enabling automatic temperature compensation without external probes.
Can this electrode be used in seawater or brine applications?
Yes—the dual-junction design and high-purity gel electrolyte significantly reduce sodium error and junction poisoning in salinities up to 45 g/L, as verified per ISO 10523 Annex B.
Is cleaning required between measurements in high-fouling environments?
Routine rinsing with deionized water suffices; for biofilm or calcium carbonate deposits, a 10% citric acid soak (5 min) followed by thorough rinsing restores baseline performance without membrane damage.
Does GreenPrima provide calibration certificates with NIST traceability?
Each electrode ships with a factory calibration report referencing certified pH buffer standards (pH 4.01, 7.00, 10.01 at 25 °C); full NIST-traceable calibration documentation is available upon request for accredited lab deployment.
What is the recommended recalibration interval under continuous operation?
Per ISO 17025 Clause 7.7, initial verification every 7 days is advised; extension to 14–21 days is permissible after establishing historical stability metrics over three consecutive validation cycles.