The A.KRÜSS Optronic DS7000 series density meter is a precision instrument designed for accurate density measurements across various industries. It operates on the frequency oscillator principle, offering ease of use and efficient measurement within minutes, typically 1-3 minutes, including tempering. The device is equipped with an integrated Peltier temperature control system, allowing for highly accurate temperature regulation between 10°C and 40°C.
Function Description:
The DS7000 series density meters measure density by filling a sample into a swinging tube. The change in the oscillating frequency, due to the altered oscillation mass, enables the determination of the sample's density. The device can be operated in several configurations:
- With drying unit DS7050: For manual sample filling, rinsing, and drying.
- With drying unit DS7050 and peristaltic pump DS7070: For manual and semi-automatic sample filling, rinsing, and drying.
- With drying unit DS7060 and peristaltic pump DS7070: For manual and semi-automatic sample filling, rinsing, and drying without the need to unplug and plug in hose connectors, thanks to its 3/2-way butterfly valve.
The peristaltic pump DS7070, when connected, facilitates semi-automatic sample filling, cleaning, and drying of the frequency oscillator. Its flow rate can be adjusted via variable rotation speed, and a time-controlled start/stop mode allows for precise dosage of fixed volumes. The DS7000 features glass frequency oscillators, allowing visual inspection for bubble-free filling.
The measurement process is initiated by pressing a button. The density meter automatically waits for the sample to reach the desired temperature before starting the measurement. Results are displayed on the touchscreen, saved in an SQL database, and can be printed or exported.
Important Technical Specifications:
- Measurement Range: 0.0000 – 2.9999 g/cm³
- Accuracy of Measurement Value:
- DS7700: ±0.001 g/cm³
- DS7800: ±0.0001 g/cm³
- Accuracy: 0.0001 g/cm³
- Measurement Modes: Individual, interval, and continuous measurement.
- Scales: Pre-set scales (absolute and relative density, alcohol and sulfuric acid concentration, %Brix) and user-defined scales.
- Measuring Time after Tempering: Approximately 1 second.
- Sample Volume (manual injection): Approximately 0.9 ml.
- Viscosity Correction: With user-defined scales.
- Adjustment: 2-point: Air and distilled water.
- Housing: Cast aluminum.
- Sample Container: Borosilicate glass.
- Display: LCD TFT 5.7" 320x240 Pixel.
- Operation: Touchscreen.
- Operating Voltage: 100 V...240 V, 50/60 Hz, 120 W.
- Temperature Compensation: Linear, Polynomial, Table, Formula.
- Temperature Sensor: Pt100 (Class A).
- Sample Temperature Range: 10 – 40 °C.
- Reproducibility: +/-0.02 °C.
- Ambient Temperature: 10 – 35 °C.
- Result Memory: 999 results.
- Printer Connection: RS-232 serial interface.
- Network Connector: Ethernet interface for connection to PC and LIMS.
- USB Connection: For data transfer and firmware update.
Usage Features:
- Intuitive Touchscreen Operation: The bright touchscreen display supports intuitive operation in 6 languages.
- User Administration: Features optional password protection and two authorization levels (User and Administrator) for enhanced security and compliance with FDA regulations (GLP compliance).
- Data Management: An integrated SQL database stores all measured values, parameters, and methods. Results can be exported in Excel/HTML format onto a USB stick.
- Firmware Updates: Easy firmware updates can be performed using a USB stick.
- Connectivity:
- USB Interface: For data export, firmware updates, and connection of a keyboard or barcode scanner.
- RS-232 Interface: For a serial printer.
- Ethernet Interface: For direct connection to a PC (remote monitoring via internet possible) and integration into Laboratory Information and Management Systems (LIMS).
- PDF Export: Allows for easy generation of PDF reports.
- Sample Resistance: All parts in contact with samples are made of glass and PTFE, ensuring high chemical resistance. Luer or UNF connections are available.
- Measurement Modes: Supports individual, interval, and continuous measurements.
- Alarm Profiles: Users can define lower and upper limit values for measurement results. Results outside these limits are clearly labeled.
- Temperature Control: Integrated Peltier tempering ensures high accuracy. Temperature compensation options (Linear, Polynomial, Table, Formula) are available.
- Cleaning Procedures: The device supports various cleaning procedures, including manual, semi-automatic with peristaltic pump, and autosampler-driven cleaning. Cleaning procedures can be defined and customized within the methods menu.
- Autosampler Operation (Firmware v7.215+): Enhanced autosampler functionality allows for defining exact measurement sequences without templates, pausing and editing sample series, and measuring previous sample series. Barcode scanner integration simplifies sequence configuration.
- Audit Trail: Available since firmware version 7.214, this function provides a computer-generated and timestamped record of all changes relevant to measurements or system settings, ensuring traceability and data integrity.
Maintenance Features:
- Low Maintenance: The DS7000 is designed for extremely low maintenance and long-lasting operation.
- Silica Gel Cartridge: Both drying units (DS7050 and DS7060) include a cartridge with silica gel to dry the sucked-in air. The silica gel should be replaced when discolored, as it indicates a loss of moisture absorption capacity.
- Fuse Replacement: Instructions are provided for safely changing the fuse, which requires disconnecting the device from the mains power supply.
- Cleaning:
- Daily: Clean the frequency oscillator with distilled water or a compatible solvent after each measurement.
- Weekly: Clean the display and casing with neutral cleaning products. Aggressive chemicals should be cleaned immediately.
- Frequency Oscillator Cleaning: Detailed procedures for manually cleaning the frequency oscillator (with or without the peristaltic pump) and semi-automatically cleaning it with the peristaltic pump and drying unit are provided.
- Final Cleaning: A final cleaning procedure is recommended after a measurement series or before decommissioning the device.
- Calibration: Measurement calibration (2-point: air and distilled water) can be performed to ensure correct measurements and remove systemic deviations.
- Service: A.KRÜSS Optronic GmbH provides warranty support and service for defects. Regular maintenance by service personnel is generally not required, but contact information is provided for function disruptions.
- Transport and Storage: Guidelines for transport (original packaging, specific temperature/humidity ranges) and storage (ambient temperature of +5 to +45 °C, max. 95% humidity) are provided to prevent damage.
- Disposal: Information on proper disposal of electric and electronic devices in accordance with relevant legal provisions (e.g., EC Directive 2002/96/EC on WEEE) is included.
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