Density Meters
DS7800 | DS7900

Key Features
• Oscillating u-tube measurement cell with high resolution
• Desiccation unit and peristaltic pump included
• Integrated high-accuracy Peltier thermostat
• User-friendly touch-screen operation in 6 languages
• Data display of all important settings and measurements
• Various programmable measurement units
• Password-protected user administration (optional)
• Ethernet interface for direct connection to a PC
• Data export and firmware update via USB interface
• RS-232 interface for dot matrix printer
• 32-bit processor
• SQL database
• NIST-compliant calibration certificate
• Full GLP suitability
• ASTM-compliant
• Low consumables costs

The DS7800 and DS7900 density meters with up to five decimal places for measuring density, relative density and concentration of aqueous solutions in a range of 0.00000 – 1.99999 g/cm³. The measuring method is based on established oscillating U-tube technology. The U-tube made of glass is monitored through a window to ensure that no gas bubble falsifies measurement results.

These devices have a high-precision recirculation air-temperature control based on a Peltier element. Calibration is performed with pure water and dry air. A dry-air unit and a peristaltic pump for sample handling are included.

Featuring an intuitively layed out touch screen, all important settings are visible on the main screen and stored in an SQL data base together with measuring results. Data storage covers the last 999 measurements.

These meters comply with ASTM D4052 and D5002. An activatable three-level user administration with password protection makes the DS7800 and 7900 particularly suitable for use in GLP/GMP regulated industries.

Fields of application:
Determination of mixing ratios, quality and quantity inspection in the following industries:
  • Chemical industry
  • Pharmaceutical industry
  • Cosmetics industry
  • Beverage industry / breweries
  • Food industry
  • Sugar and sweetener industry
  • Pulp and paper industry
  • Electronic industry
  • Petrochemical industry
  • Wastewater management

Measurement range DS7900: 0.00000 - 1.99999 g/cm³
DS7800: 0.0000 - 1.9999 g/cm³
Accuracy of measured value DS7900: 0.00005 g/cm³
DS7800: 0.0001 g/cm³
Repeatability of measured value DS7900: 0.00001 g/cm³
DS7800: 0.0001 g/cm³
Sample volume by manual injection approx. 2 ml
Temperature range 10 – 40 °C
Reproducability ±0.02 °C
Measurement time 30 – 60 s
Ambient temperature 10 – 40 °C
Calibration with dry air and distilled water
Manufacturer‘s calibration 4 –10 supporting points
3rd-degree polynomial
Case Cast aluminium
Display LCD TFT 5.7 ", 320x240 Px
Interfaces RS-232, USB, Ethernet
Power supply 90 – 264 V, 50/60 Hz, 60 W
Methods 99 freely definable methods
Result storage 999 last measurements
Printer port serial
User administration activatable
Password protection activatable
LIMS access possible


Ordering information DS7800 and DS7900 Density Meters
Model Description Price view shopping cart
DS7800   $11,575.00 please call to order
DS7900   $14,330.00

Topac Inc. 231 CJC Highway, Suite 103 Cohasset MA 02025 USA
Tel: 781 740 8778 Fax: 781 740 8779

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