Xiatech BC4002 Portable Dissolved Oxygen Meter Calibration System
| Brand | Xiatech |
|---|---|
| Origin | Shaanxi, China |
| Model | BC 4002 |
| Temperature Range | 5–50 °C |
| Temperature Stability | ±0.05 °C |
| Water Bath Volume | 2 L |
| Cooling Method | Dual-loop thermoelectric (Peltier) cooling |
Overview
The Xiatech BC4002 Portable Dissolved Oxygen Meter Calibration System is a metrologically traceable, field-deployable calibration platform engineered specifically for the verification and periodic verification of electrochemical and optical dissolved oxygen (DO) sensors and meters. It operates on the principle of controlled saturation equilibrium—establishing a stable, reproducible aqueous environment where dissolved oxygen concentration is precisely defined by temperature, atmospheric pressure, and salinity (defaulted to zero for freshwater calibration), in accordance with internationally recognized solubility models (e.g., APHA Standard Methods 4500-O G, ISO 5814:2012). Unlike generic water baths, the BC4002 integrates real-time thermodynamic calculation of saturated DO values per ASTM D888 and USP , enabling direct comparison between instrument readings and NIST-traceable reference values without manual lookup or external software interpolation.
Key Features
- High-stability temperature control: Achieves ±0.05 °C stability over the full 5–50 °C operating range, validated per ISO/IEC 17025 calibration procedures.
- Compact dual-loop thermoelectric (Peltier) cooling system: Eliminates mechanical compressors—ensuring silent, vibration-free operation critical for sensitive amperometric and luminescence-based DO probe calibration.
- 2-liter calibrated water bath volume: Accommodates immersion of multi-format DO probes—including Clark-type electrodes, galvanic cells, and optical sensor caps—without thermal stratification or edge effects.
- Integrated pressure-compensated DO standard table: Preloaded with IAPSO-standardized oxygen solubility data across 500–1050 hPa and 5–50 °C; supports user-defined salinity input for seawater or brackish calibration scenarios.
- Automated aeration module: Delivers consistent, bubble-free air saturation via sintered stainless-steel diffusers, minimizing supersaturation artifacts and ensuring rapid equilibration (<15 min from cold start at 25 °C).
- Water-jacketed heat dissipation: Enhances thermal recovery rate after probe insertion or ambient temperature shifts—critical for sequential multi-point verification workflows.
Sample Compatibility & Compliance
The BC4002 supports calibration of all common DO measurement technologies: polarographic (Clark), galvanic, and fluorescence-based (phase-fluorometric and lifetime-based) sensors. Its bath geometry and flow dynamics comply with the immersion depth and stabilization time requirements specified in JJG 291–2018, as well as ISO 5814:2012 Annex A (calibration in air-saturated water) and ASTM D888–22 Section 8.2 (standardization using air-equilibrated water). The system’s temperature uniformity profile (<0.02 °C radial gradient at 25 °C, measured per ASTM E1137) satisfies Class II requirements for secondary standard baths under ISO/IEC 17025-accredited laboratories. All firmware and calibration tables are version-controlled and audit-ready for GLP/GMP environments requiring 21 CFR Part 11–compliant record retention.
Software & Data Management
The BC4002 operates via an embedded Linux-based controller with a 7-inch capacitive touchscreen interface. It logs timestamped temperature, pressure, calculated DO saturation value, and user-entered meter reading into CSV files exportable via USB or Ethernet. Audit trails include operator ID, calibration event type (single-point verification, two-point span check), environmental metadata, and pass/fail status against JJG 291–2018 tolerance limits (±0.3 mg/L or ±3% of reading, whichever is greater). Optional PC software (Xiatech CalSuite v3.1) enables automated report generation compliant with ISO/IEC 17025 clause 7.8.2, including uncertainty budgets derived from combined Type A (repeatability) and Type B (temperature, pressure, and solubility model) components.
Applications
This system is routinely deployed in metrology labs performing third-party verification of DO instruments used in pharmaceutical water systems (PW, WFI per USP ), bioreactor monitoring (cell culture, fermentation), environmental field lab QA/QC (EPA Method 360.1), food safety testing (meat processing, beverage bottling lines), and refinery wastewater compliance (API RP 45). Its portability enables on-site verification at remote manufacturing facilities, eliminating downtime associated with instrument shipment to central calibration labs—particularly valuable for continuous DO monitoring systems integrated into SCADA or DCS architectures.
FAQ
Does the BC4002 support salinity-adjusted DO calibration?
Yes—users may input salinity values from 0 to 40 g/kg to recalculate saturation concentration using the Garcia & Gordon (1992) equation, referenced in ISO 5814:2012.
Is external pressure sensor calibration required?
No—the integrated barometric sensor is factory-calibrated against NIST-traceable reference standards and includes auto-zero compensation during startup.
Can the BC4002 be used for zero-oxygen calibration?
It is not designed for true anoxic calibration; however, users may introduce nitrogen gas via the aeration port to achieve sub-0.1 mg/L conditions for zero-point verification when paired with a certified gas supply.
What maintenance is required for long-term accuracy?
Annual verification of temperature sensor linearity (via dry-block calibrator) and pressure sensor drift (using dead-weight tester) is recommended; full system recalibration is available through Xiatech’s ISO/IEC 17025-accredited service center.
Is firmware update capability included?
Yes—updates are delivered via secure HTTPS download and installed through the onboard interface; each release includes revision history, validation test reports, and impact assessment for regulated users.
