Brookfield PHS-2C Digital Portable pH Meter
| Brand | Beifen Sanpu |
|---|---|
| Origin | Hebei, China |
| Manufacturer Type | OEM Manufacturer |
| Product Category | Domestic |
| Model | PHS-2C |
| Price Range | USD 70–140 |
| Instrument Type | Portable |
| Parameter Types | pH and mV |
| Measurement Range | pH 0.00–14.00 |
| Resolution | 0.01 pH / 1 mV |
| Accuracy | ±0.05 pH / ±0.5% F.S. (mV) |
| Temperature Compensation Range | 0–60.0 °C |
| Input Impedance | ≥3×10¹¹ Ω |
| Stability | ≤0.05 pH ±1 digit / 2 h |
| Calibration | One-point or Two-point (using USA-standard buffer solutions) |
| DC Output | 0–±2 V analog signal |
| Instrument Class | 0.02/0.05 grade |
Overview
The Brookfield PHS-2C Digital Portable pH Meter is a precision electrochemical instrument engineered for reliable field and laboratory measurement of hydrogen ion activity (pH) and redox potential (mV) in aqueous solutions. Based on the potentiometric principle—measuring the electromotive force generated across a glass pH electrode and reference electrode—the PHS-2C delivers stable, repeatable readings under variable ambient conditions. Its integrated circuit architecture minimizes electromagnetic interference, making it suitable for use near centrifuges, stirrers, or industrial control panels where electrical noise may compromise conventional meters. Designed to meet the operational requirements of QC laboratories, environmental monitoring stations, educational institutions, and small-scale production facilities, the PHS-2C conforms to fundamental metrological standards for portable pH instrumentation—including ISO 7888 (water quality — determination of pH), ASTM D1293 (standard test method for pH of water), and general GLP-aligned measurement practices.
Key Features
- Monolithic circuit design with enhanced EMI/RFI shielding for robust performance in electrically noisy environments
- Touch-sensitive mode selector enabling intuitive switching between pH/mV measurement and calibration routines
- Dual-range analog DC output (0 to ±2 V) compatible with data loggers, PLCs, and SCADA systems for process integration
- High-input-impedance amplifier (≥3×10¹¹ Ω) ensures minimal loading error when interfacing with standard combination pH electrodes from major global suppliers (e.g., Thermo Orion, Mettler Toledo, Hanna Instruments)
- Manual temperature compensation (0–60.0 °C) with real-time display, supporting accurate pH correction without requiring built-in thermistors
- Two-point calibration capability using NIST-traceable USA-standard buffer solutions (e.g., pH 4.01, 7.00, 10.01) to minimize systematic drift
- Instrument classification at 0.02/0.05 grade per JJG 119–2018 (Chinese National Verification Regulation for pH Meters), indicating compliance with routine accuracy expectations for non-regulated applications
Sample Compatibility & Compliance
The PHS-2C supports direct measurement of liquid samples across the full pH scale (0.00–14.00), including buffered aqueous solutions, wastewater effluents, food extracts, and mild chemical process streams. It is not intended for non-aqueous solvents, highly viscous suspensions, or aggressive oxidizing media (e.g., concentrated HNO₃, bleach >5%). Electrode compatibility adheres to standard BNC connectors and common reference junction configurations. While not certified to IEC 61000-4 immunity standards or FDA 21 CFR Part 11 for electronic records, its calibration traceability, stability profile (≤0.05 pH ±1 digit over 2 hours), and documented repeatability support use in ISO/IEC 17025-accredited labs where internal validation protocols are applied.
Software & Data Management
The PHS-2C operates as a standalone analog/digital hybrid meter with no embedded firmware-based data storage or USB connectivity. All measurements are displayed in real time on a high-contrast LCD screen with dual-parameter readout (pH and mV simultaneously). The ±2 V analog output enables external recording via third-party devices compliant with IEEE 1451.2 or Modbus RTU interfaces. For regulated environments requiring audit trails, users must implement external logging systems that capture timestamped analog outputs alongside manual calibration logs—consistent with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) under GMP/GLP frameworks.
Applications
- Quality control of drinking water, swimming pool maintenance, and aquaculture system monitoring
- pH verification during titration setup and buffer preparation in teaching laboratories
- In-process checks in pharmaceutical excipient manufacturing and cosmetic formulation
- Field testing of soil leachates and surface runoff in environmental impact assessments
- Calibration verification of inline pH sensors in pilot-scale bioreactors or filtration skids
FAQ
Does the PHS-2C support automatic temperature compensation (ATC)?
No—it features manual temperature compensation only. Users must input the measured sample temperature via keypad before initiating calibration or measurement.
Can this meter be used with non-BNC pH electrodes?
Only BNC-compatible electrodes are supported. Adapters for DIN or other proprietary connectors require external signal conditioning and are not validated for use with this model.
Is the ±2 V output isolated or grounded?
The analog output is non-isolated and shares common ground with the instrument’s power supply; galvanic isolation must be added externally if connecting to sensitive acquisition hardware.
What buffer standards are recommended for two-point calibration?
NIST-traceable USA-standard buffers at pH 4.01 and 7.00 (or pH 7.00 and 10.01) are specified in the operating manual to ensure alignment with international pH scale conventions.
Does the PHS-2C comply with FDA 21 CFR Part 11?
No—it lacks electronic signature capability, audit trail generation, or secure user access controls required for Part 11 compliance. It is intended for non-GxP environments or as a secondary verification tool within validated workflows.
