Shengaohua PHB-9 Portable pH Meter
| Brand | Shengaohua |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Portable |
| Parameter Type | Single-Parameter (pH/ORP/Temp) |
| Measurement Accuracy | ±0.01 pH |
| pH Range | 0.00–14.00 pH |
| ORP Range | −1999 to +1999 mV |
| Temperature Range | 0.0–100.0 °C |
| pH Resolution | 0.01 pH |
| ORP Resolution | 1 mV |
| Temperature Resolution | 0.1 °C |
| Temperature Compensation | Manual |
| Calibration | 2-point pH calibration (using pH 7.00 standard buffer) |
| Input Impedance | ≥1 × 10¹² Ω |
| Input Current | ≤2 × 10⁻¹² A |
| Operating Temperature | 0–50 °C |
| Dimensions | 157 × 76 × 38 mm |
| Weight | 206 g |
| Instrument Class | 0.1-grade |
Overview
The Shengaohua PHB-9 Portable pH Meter is a compact, field-deployable electrochemical instrument engineered for precise and reliable measurement of pH, oxidation-reduction potential (ORP), and temperature in diverse aqueous environments. Based on potentiometric principle using a glass pH electrode and reference electrode pair, the PHB-9 delivers high reproducibility in routine quality control, environmental monitoring, and process verification applications. Its design adheres to fundamental metrological requirements for portable pH instrumentation as defined in ISO 7888 (Water quality — Determination of pH) and ASTM D1293 (Standard Test Methods for pH of Water). The meter operates without external power supply—powered by standard AAA batteries—and features an auto-power-off function to extend operational life. With its 0.1-grade classification per JJG 119–2018 (Chinese National Verification Regulation for pH Meters), the PHB-9 meets baseline accuracy expectations for non-regulated laboratory and field use where GLP-compliant documentation is not mandated.
Key Features
- Backlit LCD display with dual-parameter readout: simultaneous pH/mV and temperature values, configurable via user-selectable display mode
- Manual temperature compensation (MTC) with adjustable coefficient (β = 0.0–3.0 %/°C), enabling correction for sample-specific thermal response
- Two-point calibration protocol supported exclusively with certified pH 7.00 buffer solution—optimized for stability and traceability in field conditions
- Rugged ABS housing with ergonomic form factor (157 × 76 × 38 mm; 206 g), designed for glove-compatible operation and drop resistance in industrial settings
- High-input-impedance circuitry (≥1 × 10¹² Ω) minimizes loading error during measurement of low-conductivity samples such as deionized water or organic solvents
- Low input current (≤2 × 10⁻¹² A) ensures minimal polarization drift during extended ORP monitoring sessions
Sample Compatibility & Compliance
The PHB-9 is validated for use with aqueous solutions across conductivity ranges from 10 µS/cm to 200 mS/cm. It supports measurements in municipal wastewater, surface water, effluent streams, fermentation broths, and cleaning-in-place (CIP) rinse solutions. While not certified for FDA 21 CFR Part 11 compliance or GMP audit trails, its calibration traceability aligns with ISO/IEC 17025 clause 6.4.6 for equipment verification in accredited testing laboratories performing environmental or industrial water analysis. The instrument conforms to IEC 61010-1:2010 safety standards for electrical equipment used in measurement, control, and laboratory applications.
Software & Data Management
The PHB-9 operates as a standalone, button-driven device with no embedded data logging, Bluetooth, or USB connectivity. All measurements are displayed in real time only; no internal memory or export functionality is provided. Users must manually record results in lab notebooks or external LIMS systems. For regulated environments requiring electronic records, integration with third-party data capture tools (e.g., RS-232 serial adapters paired with terminal emulation software) is possible but requires external hardware and falls outside factory validation scope. Calibration events are not timestamped or stored.
Applications
- Field-based environmental monitoring: pH and ORP profiling in rivers, lakes, wetlands, and stormwater outfalls
- Wastewater treatment plant operations: influent/effluent pH verification, anaerobic digester redox control, and disinfection process support
- Industrial process checks: pulp & paper stock pH adjustment, textile dye bath monitoring, leather tanning bath control, and dairy pasteurization line verification
- Educational laboratories: undergraduate chemistry and environmental science experiments requiring portable, entry-level electrochemical measurement capability
- Pharmaceutical facility utilities: non-GMP water system spot-checking (e.g., purified water distribution loop returns)
FAQ
Does the PHB-9 support automatic temperature compensation (ATC)?
No—it provides manual temperature compensation only. Users must enter the measured sample temperature before reading pH or ORP.
Can the PHB-9 be calibrated with buffers other than pH 7.00?
The device is configured for two-point calibration using only pH 7.00 as the primary standard; no additional buffer points (e.g., pH 4.01 or 10.01) are programmable.
Is the instrument suitable for measuring pH in non-aqueous or low-ionic-strength solutions?
Yes—with appropriate electrode selection (e.g., double-junction or sleeve-type reference electrodes)—but users must account for liquid junction potential errors and calibrate in matrix-matched standards.
What is the battery life under typical usage conditions?
Approximately 150 hours of continuous operation using three AAA alkaline batteries; auto-power-off activates after 10 minutes of inactivity.
Does the PHB-9 comply with USP or EP 2.2.3 guidelines?
It meets general performance criteria outlined in these pharmacopeial chapters for pH measurement accuracy and resolution but lacks documented system suitability testing reports required for formal compliance claims.
