GreenPrima B sens140T Online Pure Water pH Sensor
| Brand | GreenPrima |
|---|---|
| Origin | Switzerland |
| Manufacturer Type | Manufacturer |
| Origin Category | Imported |
| Model | B sens140T |
| Measuring Range | 0–14 pH |
| Operating Temperature | −5 to 100 °C |
| Reference Electrode | Ag/AgCl Cartridge |
| Temperature Sensor | PT1000 |
| Max. Pressure | 6 bar |
| Electrode Body Material | Glass |
| Electrolyte | Gel-filled |
| Junction | Triple Ceramic Porous Diaphragm |
| Glass Membrane | S-glass |
| Minimum Immersion Depth | 20 mm |
| Zero Point | 0 ± 20 mV |
| Sensitivity | 57–59 mV/pH at 25 °C |
| Minimum Sample Conductivity | 0.1 µS/cm |
| Response Time (pH 4–7) | < 30 s |
| Thread Size | PG13.5 |
| Cable Length | 5 m |
Overview
The GreenPrima B sens140T is a high-stability, gel-electrolyte online pH sensor engineered specifically for continuous monitoring of low-conductivity aqueous media—including ultrapure water (UPW), deionized water (DIW), reverse osmosis (RO) permeate, and pharmaceutical-grade water (PW/WFI). Unlike conventional pH electrodes, the B sens140T employs an S-glass membrane with optimized ion exchange kinetics and a triple-ceramic junction architecture to minimize liquid junction potential drift and electrolyte leaching—critical factors in sub-1 µS/cm conductivity environments. Its measurement principle relies on the Nernstian response of hydrogen-ion activity across the hydrated glass membrane, referenced against a stable Ag/AgCl cartridge system with low-resistance gel electrolyte. Designed for integration with GreenPrima’s PM8200P pH/ORP controller, the sensor delivers traceable, reproducible pH data under dynamic process conditions typical of semiconductor wet benches, biopharmaceutical purification loops, and power plant condensate systems.
Key Features
- S-glass membrane formulation for enhanced sensitivity and reduced alkaline error in low-ionic-strength water
- Triple ceramic junction providing balanced electrolyte outflow and exceptional resistance to clogging or poisoning
- Gel-filled Ag/AgCl reference system eliminating maintenance-intensive liquid refilling and minimizing contamination risk
- Integrated PT1000 temperature sensor enabling automatic temperature compensation (ATC) with ±0.1 °C accuracy
- Robust PG13.5 threaded housing rated IP68 for direct insertion into pressurized lines or open tanks (max. 6 bar)
- Optimized for minimum immersion depth of only 20 mm—ideal for low-volume bypass streams and micro-loop applications
- Calibration-compatible with standard NIST-traceable buffers (pH 4.01, 7.00, 10.01) and verified per ISO 17025-accredited procedures
Sample Compatibility & Compliance
The B sens140T is validated for use in water matrices with conductivity as low as 0.1 µS/cm—well below the threshold where conventional electrodes exhibit unstable zero points and prolonged response times. It complies with key industry requirements for critical water systems: ASTM D1125 (Standard Test Methods for Electrical Conductivity and Resistivity of Water), USP (Water Conductivity), and EP 2.2.38 (Conductivity of Water for Pharmaceutical Use). Its construction adheres to IEC 61508 (functional safety for sensors in SIS) and meets material compatibility standards per FDA CFR 21 Part 177 (indirect food additives) and USP Class VI biocompatibility testing. The sensor is suitable for GMP-regulated environments where audit-ready calibration records and drift verification protocols are mandatory.
Software & Data Management
When paired with the GreenPrima PM8200P controller, the B sens140T supports dual 4–20 mA analog outputs (pH and temperature), Modbus RTU over RS485, and configurable relay logic for automated chemical dosing control. The controller firmware includes built-in GLP-compliant data logging (timestamped pH, temp, mV, slope, offset), automatic calibration validation alerts, and password-protected configuration access. All calibration events—including date, buffer values, measured mV, and electrode diagnostics—are stored with immutable timestamps, satisfying FDA 21 CFR Part 11 requirements for electronic records and signatures when deployed with appropriate IT infrastructure.
Applications
- Real-time pH monitoring in ultrapure water distribution loops for semiconductor front-end fabrication
- RO and EDI system performance verification in pharmaceutical water-for-injection (WFI) generation
- Condensate polishing control in thermal power plants to prevent copper and iron corrosion
- In-line pH verification during clean-in-place (CIP) and sterilize-in-place (SIP) cycles
- Environmental compliance monitoring of low-TDS effluent streams prior to discharge
- Research-grade water quality assurance in analytical laboratories requiring sub-0.02 pH unit repeatability
FAQ
What distinguishes the B sens140T from general-purpose pH sensors?
It features S-glass membrane chemistry and triple-ceramic junction geometry optimized for minimal junction potential drift in conductivity <1 µS/cm—where standard electrodes fail to stabilize.
Can the B sens140T be used in steam-sanitized systems?
Yes—its glass body and PT1000 sensor are rated for intermittent exposure up to 100 °C; however, continuous operation above 80 °C requires cooling sleeve integration per ASME B31.1 guidelines.
Is calibration required before each use?
No—calibration frequency follows ISO/IEC 17025-based risk assessment; typical intervals range from 24 hours (critical WFI loops) to 7 days (RO monitoring), validated by slope and offset trending.
Does the sensor support digital diagnostics via HART or Foundation Fieldbus?
Not natively—the B sens140T is analog-output focused; for digital protocol integration, GreenPrima recommends the PM8200P’s RS485 Modbus interface with gateway translation.
How is long-term stability verified in pure water applications?
Via daily zero-point checks using air-saturated ultrapure water (target: −20 to +20 mV) and periodic slope verification with pH 7.00 buffer—both tracked in the PM8200P’s audit log.
