GreenPrima BSens 140T Low-Conductivity Water pH Electrode
| Brand | GreenPrima |
|---|---|
| Origin | Switzerland |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Import Status | Imported |
| Model | BSens 140T |
| Measurement Range | 0–14 pH |
| Operating Temperature | −5 to 100 °C |
| Resolution | 0.01 pH |
| Accuracy | ±0.01 pH |
| Max. Pressure Rating | 3.5 bar |
| Sensing Element | AH-Type Glass Bulb (Asymmetric Hydrogen-Responsive) |
| Reference System | Integrated Gel-Filled Ag/AgCl Reference |
| Body Material | Chemically Resistant Glass |
| Threaded Connection | PG13.5 (DIN 40430) |
| Cable Options | 5 m / 10 m / Custom Length |
| Electrolyte Type | Polymer-Gel Electrolyte (Maintenance-Free, Leakage-Resistant) |
Overview
The GreenPrima BSens 140T is a high-stability, gel-filled composite pH electrode engineered specifically for accurate and drift-resistant measurement in ultra-low-conductivity aqueous media—such as ultrapure water (UPW), reverse osmosis (RO) permeate, deionized (DI) water, and boiler feedwater. Unlike conventional pH electrodes, the BSens 140T employs an asymmetric hydrogen-responsive AH glass bulb combined with a sealed, low-migration polymer-gel reference system. This architecture mitigates liquid junction potential instability—a primary source of error in low-ionic-strength environments—by minimizing electrolyte leaching and stabilizing the diffusion potential across the reference junction. Its design adheres to the electrochemical principles outlined in ISO 3696 (Grade 1 water specifications) and ASTM D1129 (Standard Terminology Relating to Water), making it suitable for applications demanding compliance with pharmaceutical water quality standards (e.g., USP , EP 2.2.43) and semiconductor-grade UPW monitoring.
Key Features
- Asymmetric hydrogen-sensitive AH glass membrane: Optimized for rapid response and minimal alkaline error in sub-1 µS/cm conductivity water.
- Gel-filled Ag/AgCl reference system: Eliminates need for refilling; prevents clogging and electrolyte depletion during continuous online operation.
- PG13.5 threaded process connection: Enables secure, leak-tight installation into standard inline housings or flow cells compliant with DIN 19267 and EN 14183.
- Robust all-glass body construction: Resistant to thermal shock, chemical attack from trace oxidants (e.g., ozone, H₂O₂), and mechanical stress in pressurized loops (up to 3.5 bar).
- Low-drift performance: Typical baseline drift <0.02 pH/24 h under stable temperature and flow conditions—validated per IEC 62255-2 for online sensor reliability.
- Optional cable configurations: Factory-terminated shielded cables (5 m or 10 m) with IP68-rated connectors; custom lengths available for integration into distributed SCADA or PLC-based monitoring systems.
Sample Compatibility & Compliance
The BSens 140T is validated for use in waters with conductivity ≤ 10 µS/cm, including ASTM Type I–III reagent water, nuclear-grade condensate, and power plant turbine condensate. It complies with key regulatory and industrial frameworks governing water quality instrumentation: EN ISO 17294-1 (water analysis — inductively coupled plasma mass spectrometry), and supports audit-ready data acquisition when paired with transmitters compliant with FDA 21 CFR Part 11 (electronic records/signatures). Its gel electrolyte formulation meets RoHS Directive 2011/65/EU and REACH Annex XIV restrictions on hazardous substances. No mercury or thallium compounds are used in the reference system.
Software & Data Management
While the BSens 140T is an analog sensor element, it is fully compatible with GreenPrima’s GPM-4000 series intelligent pH transmitters—which provide digital signal conditioning, temperature compensation (via integrated Pt1000 RTD), and real-time diagnostics (e.g., glass impedance monitoring, reference junction resistance trending). Transmitter firmware supports Modbus RTU/TCP, HART 7, and Profibus PA protocols. All calibration events, slope/mV offset values, and sensor health logs are timestamped and exportable in CSV format—enabling GLP/GMP-compliant record retention and trend analysis in LIMS or MES platforms.
Applications
- Real-time pH monitoring in semiconductor fab UPW distribution loops (SEMI F57-0218 compliance support)
- Pharmaceutical purified water (PW) and water-for-injection (WFI) systems per EU GMP Annex 1 and USP
- Power generation: Condensate polishing units, steam cycle chemistry control (EPRI TR-102324 guidelines)
- Microelectronics rinse tank control and wastewater pretreatment influent characterization
- Research-grade ultrapure water systems in synchrotron or neutron source facilities
FAQ
Can the BSens 140T be used in seawater or high-salinity brines?
No. Its gel reference system and AH glass formulation are optimized for low-ionic-strength matrices only. For high-conductivity samples (>1000 µS/cm), GreenPrima recommends the BSens 220T dual-junction electrode.
Is routine recalibration required during continuous online operation?
Yes. Per ISO 15197 and ASTM D1293, daily verification using NIST-traceable buffer solutions (pH 4.01, 7.00, 10.01) is recommended. The electrode’s built-in impedance diagnostic allows predictive maintenance scheduling.
Does the PG13.5 thread meet ANSI/ISA-76.00.02 mechanical interface standards?
Yes. PG13.5 (DIN 40430) is dimensionally equivalent to ½–14 NPT in sealing profile and is widely accepted in European and APAC process analyser installations.
Can the cable be extended beyond 10 m without signal degradation?
For analog 4–20 mA output configurations, extension beyond 10 m requires twisted-pair shielded cable with ≤ 100 Ω/km loop resistance and proper grounding at the transmitter end to avoid noise-induced offset errors.
