Technical Overview and Performance Specifications of the ZX-PH pH Meter

The ZX-PH pH Meter represents a versatile and robust analytical instrument designed for precise electrochemical measurements. Featuring a large, blue-backlit dual-row LCD, it clearly displays primary readouts alongside temperature, catering to various laboratory and field applications. Its capability extends beyond standard pH measurement to include mV measurement for electrode potential, operation with ORP (Oxidation-Reduction Potential) electrodes, and compatibility with ion-selective electrodes, making it a multifunctional tool for quality control, environmental monitoring, and research.

Key Features and Design Philosophy
Engineered for reliability and efficiency, the device emphasizes three core attributes:

Rapid and Accurate Measurement: Leveraging a high-impedance input stage, it ensures fast stabilization and trustworthy readings.

Field-Portable Design: Its compact form factor (300 x 200 x 72 mm) and manageable weight (1.5 kg) facilitate easy transportation and use in non-laboratory settings.

Enhanced Signal Integrity: The design is specified to be immune to external magnetic interference, relying only on the terrestrial magnetic field, which promotes signal stability in diverse environments.

Detailed Technical Performance Indicators
The performance of the ZX-PH Meter is defined by the following critical specifications:

1.Measurement Ranges & Resolution:

pH: Display range from -2.00 to 18.00 pH, with a standard measuring range of 0.00 to 14.00 pH. The minimum display unit is 0.01 pH.

mV: A full-scale range of ±1999 mV, with automatic polarity display and a resolution of 1 mV.

Temperature: 0.0 to 99.9 °C, with a resolution of 0.1 °C.

2.Accuracy and Error Limits:

Electronic Unit (Basic Error): ±0.01 pH, ±1 mV, and ±0.3 °C.

Overall Device (Including Electrode): ±0.02 pH and ±0.5 °C. This distinction is crucial for technicians to understand the system's total error budget.

Temperature Compensation: Operates automatically within 0.0–99.9 °C, with a compensation error of ±0.01 pH.

3.Critical Electrical Parameters:

Input Impedance: ≥ 1 x 10^12 Ω. This exceptionally high value is essential for preventing current draw from the measurement cell, ensuring accurate pH readings, especially with high-resistance glass electrodes.

Input Current: ≤ 2 x 10^-12 A. This ultra-low bias current minimizes measurement error.

Stability & Repeatability: The electronic unit exhibits a stability of ±0.01 pH per 3 hours. Repeatability error is ≤0.01 pH for the complete device, ensuring consistent results over successive measurements.

4.Operational Environment:

Designed to operate reliably within an ambient temperature of 5 to 40 °C and at relative humidity ≤85%.

Power is supplied via standard AC (220V ±10%, 50Hz) mains.

Technical Application Notes
For technicians, understanding these specifications informs proper application:

1.The high input impedance and low input current are fundamental for accurate potentiometric measurements. This makes the instrument suitable for use with all modern pH, ORP, and ion-selective electrodes without loading the circuit.

2.The separation of "electronic unit" error from "device" error highlights the importance of electrode selection, calibration, and maintenance in achieving the stated system performance.

3.The wide display range for pH (-2.00 to 18.00) allows for monitoring in extreme samples or during diagnostic procedures, such as electrode conditioning.

Conclusion
The ZX-PH pH Meter is a fully-featured, precision instrument that balances laboratory-grade performance with field-portable convenience. Its detailed technical indicators confirm a design focused on measurement integrity, versatility across electrochemical techniques, and operational robustness. For technical personnel, its specifications provide a clear framework for validating its suitability for specific measurement protocols and for troubleshooting system performance by isolating electronic unit performance from sensor-related variables.

 GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/