FangZhou PHS-4C+ Benchtop Laboratory pH Meter for Wastewater Analysis
| Brand | FangZhou |
|---|---|
| Origin | Sichuan, China |
| Model | PHS-4C+ |
| Instrument Type | Benchtop |
| Parameter Types | Multi-parameter (pH, mV, ORP, Temperature) |
| pH Measurement Range | 0.000–14.000 pH |
| Resolution | 0.001/0.01/0.1 pH (adjustable) |
| Accuracy | ±0.002 pH ±1 digit |
| Repeatability | 0.001 pH |
| mV/ORP Range | −1999.9 to +1999.9 mV |
| mV Resolution | 0.1/1 mV (adjustable) |
| mV Accuracy | ±0.02% FS ±1 digit |
| Temperature Range | −5.0 to 105.0 °C |
| Temp. Resolution | 0.1 °C |
| Temp. Accuracy | ±0.3 °C ±1 digit |
| Input Impedance | ≥3 × 10¹² Ω |
| Calibration Points | 1–3 point auto-identification with NIST-traceable standard buffers (pH 4.00, 6.86, 9.18 at 25 °C) |
| Temperature Compensation | Automatic (ATC) or manual, −5.0 to 105.0 °C |
| Interface | BNC electrode port, Pt1000 temperature sensor port, RS232 serial communication |
| Power Supply | DC 9 V / 300 mA (center-positive) |
Overview
The FangZhou PHS-4C+ is a high-precision benchtop pH meter engineered for rigorous wastewater monitoring, environmental compliance testing, and routine laboratory quality control. Designed around a microprocessor-controlled architecture with programmable measurement logic, it implements potentiometric measurement principles in accordance with ISO 3696, ASTM D1293, and USP , delivering traceable, reproducible results across complex aqueous matrices. Its core functionality centers on the Nernstian response of glass pH electrodes—measuring the potential difference between a sensing half-cell and a stable reference system—while compensating for thermal drift via integrated Pt1000 temperature sensing. The instrument meets Class 0.001 pH accuracy requirements per IEC 62311 and is validated for use in GLP-compliant environmental laboratories performing regulatory wastewater discharge analysis under EPA Method 150.1 and China’s HJ 1147-2020 standard.
Key Features
- Three selectable pH resolution modes (0.001 / 0.01 / 0.1 pH) enabling adaptive precision for both high-sensitivity calibration verification and rapid field screening
- Intelligent auto-calibration algorithm with automatic buffer recognition (NIST-traceable pH 4.00, 6.86, 9.18 at 25 °C), endpoint stabilization detection, and real-time electrode health diagnostics
- Dual-mode temperature compensation: automatic (ATC) using Pt1000 probe or manual entry, covering −5.0 to 105.0 °C with ±0.3 °C accuracy
- Multi-parameter capability supporting simultaneous pH, mV, ORP, and temperature acquisition—with mV range extended to ±1999.9 mV and resolution configurable to 0.1 or 1 mV
- Robust input impedance (>3 × 10¹² Ω) minimizing loading errors during high-resistance measurements typical of aged or fouled electrodes in industrial effluents
- BNC-compatible electrode interface with optional adapter module for universal compatibility across glass, gel-filled, double-junction, and ion-selective electrodes (e.g., F⁻, Cl⁻, NH₄⁺)
- Non-volatile memory retaining up to 50 calibration records, date/time stamps, and user-defined settings—even after power loss
- IP65-rated front panel housing with chemical-resistant casing, rated for continuous operation in humid, corrosive environments common in municipal wastewater treatment plants
Sample Compatibility & Compliance
The PHS-4C+ is validated for direct measurement of undiluted industrial wastewater, leachate, activated sludge supernatants, and pretreated effluent streams containing suspended solids, heavy metals, sulfides, and organic loadings. Its high-input-impedance circuitry ensures stability when interfacing with clogged or low-activity electrodes frequently encountered in high-TDS or viscous samples. The instrument conforms to ISO/IEC 17025 documentation requirements for calibration traceability and supports audit-ready data integrity through timestamped calibration logs and electrode status flags. All firmware operations comply with FDA 21 CFR Part 11 principles for electronic records—including secure user authentication, change tracking, and immutable audit trails—when paired with compliant RS232 data logging software.
Software & Data Management
Data export is facilitated via standard RS232 serial interface (38400 bps, 8-N-1 protocol), compatible with industry-standard LIMS platforms and custom SCADA integration. FangZhou provides optional PC-based configuration utility (Windows 10/11) enabling remote calibration setup, firmware updates, report generation (CSV/PDF), and batch export of calibration history—including slope, offset, and asymmetry potential diagnostics. All stored calibration events include NIST buffer lot numbers, ambient temperature, operator ID, and electrode identification—supporting full chain-of-custody documentation required under ISO 17025 accreditation and EPA NPDES permit reporting.
Applications
- Regulatory wastewater pH compliance monitoring per EPA 40 CFR Part 136 and China’s GB 8978-1996 discharge standards
- Process control in electroplating rinse baths, textile dyeing effluents, and food processing wastewater neutralization tanks
- Calibration verification of online pH sensors used in continuous emission monitoring systems (CEMS)
- Research-grade acid-base titration endpoint detection in environmental chemistry labs
- ORP monitoring for redox-sensitive treatment processes including denitrification and sulfide oxidation
- Ion concentration profiling using interchangeable ISEs—validated for fluoride in landfill leachate and ammonium in anaerobic digesters
FAQ
Does the PHS-4C+ support automatic temperature compensation with all electrode types?
Yes—ATC is enabled when a Pt1000 temperature probe is connected; manual temperature entry remains available for non-ATC electrodes or fixed-temperature incubation studies.
Can calibration data be exported for regulatory audits?
Yes—via RS232, all calibration records (including date/time, buffer IDs, slope %, offset mV, and electrode ID) are exportable in CSV format with ISO 8601 timestamps.
What is the warranty coverage and service support structure?
The instrument carries a 36-month limited warranty on the main unit; electrode transducers are covered for 6 months against manufacturing defects. FangZhou maintains ISO 9001-certified technical support and calibration validation services through authorized regional service centers in Asia, Europe, and North America.
