➤ Product Introduction
Ambient-temperature dissolved oxygen is an important indicator for evaluating the intuitive remediation capacity of water quality. Currently, the popular electrochemical membrane method and fluorescence method require dissolved oxygen measurement.
Dissolved oxygen in natural water at ambient temperature exhibits significant dispersion in readings under different atmospheric pressures, water temperatures, and salinities. Atmospheric pressure varies considerably across different altitudes, seasons, and times, making air-based calibration unable to accurately calibrate instruments and sensors.
The ambient-temperature dissolved oxygen metrology calibration bench provides a research and experimental platform for the development and metrological evaluation of ambient-temperature dissolved oxygen. It complies with JJG 291-2018 Verification Regulation of Dissolved Oxygen Meters and JBT 14.242-2022 Online Dissolved Oxygen Monitor requirements. Verification content can be customized according to user needs, with evaluation results supporting storage or printing, effectively addressing issues of poor industry standardization and low detection efficiency.
➤ Main Performance Features
● System connects to the internet for remote control and fault diagnosis;
● Rapid constant-temperature water bath creates experimental variables for dissolved oxygen temperature compensation in water samples;
● Digital high-precision atmospheric pressure creates pressure compensation variables for dissolved oxygen experiments;
● Salinity adjustment provides salinity compensation experimental variables for oxygen solubility at different salinities;
● Experimental condition creation is automated and program-controlled, requiring minimal manual intervention;
● Built-in data bus interface enables simultaneous evaluation and assessment of multiple sensors;
● Experimental data during verification is automatically recorded, generating project experimental data queues;
● Supports playback of historical data and curves, with U-disk data export capability;
● Can generate metrological analysis trends and product quality reports for tested instruments or sensors;
● The experimental process releases no heat to the environment, reducing impact on laboratory temperature fields.
➤ Main Technical Parameters
| Instrument Name | Ambient-Temperature Dissolved Oxygen Calibration and Metrology Test Bench |
| Water Bath | Constant temperature range settable (5–40)°C Temperature fluctuation no greater than 0.1°C Uniformity no more than ±0.1°C Resolution no less than 0.01°C Heating/cooling rate adjustable (0.1–1.7)°C/min |
| Timer | Scale division 0.1s; maximum permissible error no more than ±0.5s/d |
| External Temperature Comparison Sensor | Measurement range (0–50)°C Resolution 0.01°C Maximum permissible error no more than ±0.15°C |
| Digital Barometric Pressure Sensing | Atmospheric pressure measurement range (800–1066)hPa Scale division 1hPa Maximum permissible error no more than ±2.5hPa |
| Operating Environment | Temperature: (15–25)°C Humidity: no greater than 85% |
| Voltage Output | DC (5–28)V adjustable |
| Pressure Simulation Environment Control | Control range: in-table pressure from ±10hPa (800–1066)hPa Control accuracy ±1hPa |
| Salinity Control | (0–30)g/L |
| Working Medium | Water |
| Overall Power Consumption | <2KW |
| Power Supply | AC 220±10%V; 50/60Hz |
| Instrument Dimensions | Width × Height × Depth: 1400 × 1550 × 802mm |
| Overall Weight | <100KG (excluding energy storage liquid) |
➤ Typical Applications
● Used by metrological verification institutions for verification and calibration of ambient-temperature dissolved oxygen;
● Applicable for performance evaluation and testing of electrochemical and fluorescence method ambient-temperature dissolved oxygen;
● Suitable for dissolved oxygen sensor development and manufacturing enterprises for product performance and quality delivery;
● Meets requirements for performance verification and calibration after sensor repair or consumable replacement;
● Provides a research, teaching experiment, and verification platform for scientific research institutions and universities.
