Leici YHBJ-262 Portable pH/ORP Meter
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Region Category | Domestic (China) |
| Model | YHBJ-262 |
| Price Range | USD 280–700 |
| Instrument Type | Laboratory-Grade Portable ORP Meter |
| ORP Range | (−2000.0 to +2000.0) mV |
| ORP Resolution | 0.1 mV |
| ORP Accuracy (Electronic Unit) | ±0.1% or ±0.3 mV |
| ORP Repeatability (Electronic Unit) | 1 mV |
| ORP System Accuracy (with electrode) | ±15 mV |
| pH Range | −2.00 to 20.00 |
| pH Resolution | 0.01 |
| pH Accuracy (Electronic Unit) | ±0.01 pH |
| pH Repeatability (Electronic Unit) | 0.005 pH |
| Input Current | ≤1 × 10⁻¹² A |
| Input Impedance | ≥1 × 10¹² Ω |
| pH System Accuracy | ±0.02 pH |
| pH System Repeatability | 0.01 pH |
| Temperature Range | −5.0 to 110.0 °C (23.0 to 230.0 °F) |
| Temp. Resolution | 0.1 °C / 0.1 °F |
| Temp. Accuracy (Electronic Unit) | ±0.2 °C |
| Temp. System Accuracy | ±0.4 °C (0.0–60.0 °C), ±1.0 °C (other ranges) |
| IP Rating | IP65 |
| Dimensions | 80 × 225 × 35 mm |
| Weight | 0.4 kg |
| Power | Rechargeable Li-ion battery |
| AC adapter input | 100–240 V AC, output: 5 V DC |
Overview
The Leici YHBJ-262 Portable pH/ORP Meter is a laboratory-grade, field-deployable electrochemical instrument engineered for high-fidelity potentiometric measurement of hydrogen ion activity (pH) and oxidation-reduction potential (ORP) in aqueous solutions. Operating on the Nernst equation principle, the meter interfaces with combination glass electrodes (pH) and noble-metal redox electrodes (e.g., Pt or Ag/AgCl) to deliver thermodynamically grounded voltage readings converted into standardized pH units or absolute mV values. Designed for rigorous use across environmental monitoring, quality control, and academic research, the YHBJ-262 integrates dual-channel analog signal conditioning, temperature-compensated calibration algorithms, and robust digital signal processing to ensure metrological traceability under variable ambient conditions—including outdoor deployment, mobile labs, and resource-constrained facilities.
Key Features
- True dual-parameter operation: simultaneous real-time display of pH, ORP (mV), temperature, and measurement status indicators
- Three configurable measurement modes: continuous acquisition, equilibrium-based measurement with dynamic stability detection, and programmable timed sampling (interval or sequential)
- Comprehensive GLP compliance support: each stored record embeds timestamp, operator ID, sample ID, electrode serial number, calibration history, and environmental metadata
- Intelligent electrode management: automatic recognition of GB, DIN, and NIST-certified pH buffer standards; 1-point ORP calibration; 1–5 point pH calibration with slope and offset diagnostics
- High-resolution graphical LCD (128 × 64 pixels) with backlight, optimized for daylight readability and glove-compatible navigation
- IP65-rated enclosure ensures protection against dust ingress and low-pressure water jets—suitable for fieldwork in rain, humidity, or splash-prone environments
- Onboard data storage for up to 500 complete measurement sets, retrievable via scroll, search-by-ID, or time-range filtering
- Integrated USB 2.0 interface and RS232 port for direct connection to PCs or thermal printers; compatible with Leici’s proprietary PC communication software for data export (CSV, TXT) and firmware updates
- Rechargeable lithium-ion battery providing >12 hours of continuous operation; universal AC adapter (100–240 V) included
Sample Compatibility & Compliance
The YHBJ-262 is validated for use with standard aqueous samples including surface water, wastewater, potable water, beverage formulations, pharmaceutical buffers, cosmetic emulsions, and textile dye baths. It supports measurements in low-ionic-strength media (e.g., rainwater, deionized water) through high-input-impedance circuitry (>1 × 10¹² Ω) and ultra-low input current (<1 pA), minimizing polarization errors. The instrument conforms to ISO 7888 (water quality — determination of pH), ASTM D1293 (Standard Test Method for pH of Water), and USP (pH Measurement). Its GLP implementation includes full audit trail capability—recording user actions, calibration events, and system diagnostics—making it suitable for regulated environments requiring FDA 21 CFR Part 11–compliant documentation when paired with validated software workflows.
Software & Data Management
Leici’s dedicated PC software enables secure bidirectional communication: downloading stored datasets, generating calibration reports with uncertainty estimates, exporting trend curves (pH vs. time, ORP vs. temperature), and performing batch statistical analysis (mean, SD, min/max). All exported files retain embedded GLP headers for regulatory review. Firmware upgrades are delivered as signed binary packages, preserving configuration integrity while enabling future enhancements such as expanded buffer library support or custom unit definitions. No cloud dependency: all data remains locally controlled, satisfying institutional data sovereignty requirements.
Applications
- Environmental field surveys: acid rain monitoring, river/stream health assessment, sediment pore-water redox profiling
- Wastewater treatment plants: process control of anaerobic digesters, chlorine residual verification, effluent compliance reporting
- Food & beverage QA/QC: shelf-life studies, fermentation endpoint detection, cleaning-in-place (CIP) validation
- Pharmaceutical manufacturing: buffer preparation verification, excipient compatibility testing, stability-indicating assays
- Academic teaching labs: electrochemistry fundamentals, Nernst equation verification, electrode kinetics experiments
- Geological exploration: groundwater redox zonation mapping, mine drainage characterization
FAQ
Does the YHBJ-262 support automatic temperature compensation (ATC) during pH and ORP measurements?
Yes—integrated Pt1000 RTD sensor enables real-time ATC for both pH and ORP readings; manual temperature entry is also supported.
Can the instrument store calibration data separately for multiple electrodes?
No—calibration parameters are stored per measurement mode (pH or ORP), not per electrode; however, electrode-specific IDs can be logged manually in sample metadata.
Is the USB interface compatible with Windows 11 and macOS Ventura or later?
Yes—the included driver package supports Windows 7–11 (64-bit) and macOS 12–14; no virtual machine or legacy OS required.
What is the recommended recalibration frequency for routine use?
Per ISO/IEC 17025 guidance: before each analytical session, after electrode replacement, and following exposure to extreme pH or high-solids matrices.
Does the device meet IEC 61000-4 electromagnetic immunity standards?
Yes—it complies with IEC 61000-4-2 (ESD), -4-3 (radiated RF), and -4-4 (electrical fast transients) at Level 3, ensuring stable operation near industrial instrumentation.
