Product overview
The DR7000 series measures refractive index nD, sucrose concentration %Brix and other user-defined concentrations in liquid samples. An optical CCD sensor, Peltier temperature control, measurement and evaluation electronics and a touch display are integrated for stand-alone operation.
The four models offer two measurement-range and accuracy levels with different temperature-control ranges. DR7200-P and DR7400-P include full audit trail for laboratories requiring traceable electronic records and data integrity.
Models and core specifications
| Model | Measuring range | Measurement accuracy | Resolution | Temperature-control range | Audit-trail functionality |
|---|---|---|---|---|---|
| DR7100-P | nD 1.3000–1.5800; 0–95 %Brix | nD ±0.0001; ±0.1 %Brix | nD 0.0001; 0.1 %Brix | 10–60 °C | None |
| DR7200-P | nD 1.3000–1.5800; 0–95 %Brix | nD ±0.0001; ±0.1 %Brix | nD 0.0001; 0.1 %Brix | 10–60 °C | Completely available |
| DR7300-P | nD 1.30000–1.72000; 0–95 %Brix | nD ±0.00002; ±0.02 %Brix | nD 0.00001; 0.01 %Brix | 10–80 °C | None |
| DR7400-P | nD 1.30000–1.72000; 0–95 %Brix | nD ±0.00002; ±0.02 %Brix | nD 0.00001; 0.01 %Brix | 10–80 °C | Completely available |
Advantages
Operation and data management
- 7.0-inch capacitive touchscreen, 800 × 480 pixels, with multilingual interface and keyboard/mouse operation.
- Menu-guided adjustment and built-in help; stand-alone operation without an external PC or additional software.
- More than 10,000 user accounts, 1,000 methods and 1,000,000 stored measurement records.
- Export results to USB storage or a password-protected network folder in PDF, PDF/A or CSV format.
Measurement and temperature control
- Pre-installed refractive-index nD and sucrose %Brix scales; unlimited user-defined scales and automatic conversion, with up to three scales displayed simultaneously.
- Single, interval and continuous measurement; approximately 0.3 ml sample and approximately two-second measurement period after temperature equalisation.
- Precise Peltier control with measured-value preview updated every second; selectable ICUMSA %Brix compensation and user-defined temperature compensation.
- Temperature control: 10–60 °C for DR7100-P/DR7200-P; 10–80 °C for DR7300-P/DR7400-P.
Assistance systems and instrument design
- TempGate® continuously monitors sample temperature control; the LED ring around the sample well indicates readiness.
- Measurement Stability Check (MSC) stores only values meeting the defined stability criteria.
- Dynamic Temperature Control (DTC) automatically and uniformly controls sample temperature; the required control accuracy can be set and temperature/measurement periods adapted to the sample.
- The ventilation unit is sealed from optical and electronic components. Intelligent heat and ventilation control keeps noise below 10 dB within the 15–30 °C control range.
- Powder-coated aluminium housing with IP20 protection; a modular interchangeable flow-through cell with a flat measuring trough supports quick cleaning.
Compliance and data integrity
- DR7200-P and DR7400-P provide audit trails to support workflows involving 21 CFR Part 11 and EU Annex 11. Users must confirm applicability and system validation for their intended use. DR7100-P and DR7300-P do not provide audit trails.
- Audit trail records measurements, electronic signatures, exports and setting changes, with comments; audit records and results cannot be edited or deleted.
- Three predefined levels: User, Application Administrator and System Administrator; unique logins, complex passwords and defined password expiry periods.
- Raw data can be accessed and saved; measurement results are stored together with all method settings for traceability.
- Traceable printout of data and device settings, authorised date/time settings and electronic signatures.
- Only signed files recognised as permissible by the system can be loaded; import/export interfaces can be configured system-wide.
Technical data
| Item | Specification |
|---|---|
| Scales | Refractive index nD, sucrose concentration %Brix and user-defined scales (unlimited) |
| Measurement modes | Single, interval or continuous measurement; up to three scales visible simultaneously during measurement |
| Measurement period | Approx. 2 s after temperature equalisation |
| Measurement prism | Sapphire |
| Light source | LED, 589 nm |
| Sample volume/filling quantity | Approx. 0.3 ml |
| Components in contact with the sample | Sapphire, PTFE and stainless steel 1.4404 (X2CrNiMo 17-12-2) |
| Temperature control | Integrated Peltier sample temperature-control system |
| Temperature-control range | DR7100-P and DR7200-P: 10–60 °C; DR7300-P and DR7400-P: 10–80 °C |
| Temperature-control accuracy | DR7100-P and DR7200-P: ±0.1 °C; DR7300-P and DR7400-P: ±0.03 °C |
| Temperature compensation | Selectable automatic temperature compensation for %Brix according to ICUMSA; custom temperature compensation can be created by the user |
| Temperature measurement | Integrated Pt100 temperature sensor |
| Temperature-measurement range | 10–80 °C |
| Temperature-measurement accuracy | ±0.1 °C |
| Temperature-measurement resolution | DR7100-P and DR7200-P: 0.1 °C; DR7300-P and DR7400-P: 0.01 °C |
| Ambient temperature | 10–40 °C |
| Ambient humidity | 10–90% (non-condensing) |
| Operation and display | Stand-alone device including firmware; 7.0-inch capacitive touchscreen, 800 × 480 pixels |
| User accounts | More than 10,000 |
| Methods | More than 1,000 |
| Measured-data storage | More than 1,000,000 records |
| Electronic interfaces | 2 × USB 2.0 Type A, 1 × RS-232 and 1 × LAN |
| Housing and protection class | Powder-coated aluminium; IP20 |
| Dimensions (W × H × D) | 230 × 170 × 360 mm |
| Weight | 5 kg |
| Operating voltage | 90–240 VAC |
| Power consumption | 40 W in measuring mode; 75 W maximum |
| Rated frequency | 50–60 Hz |
Official notes: (1) refractive-index measurement accuracy is specified at λ = 589 nm, 20 °C, 1013 hPa and 50% relative humidity; (2) the temperature-control range applies under non-condensing ambient conditions; (3) the measurement period applies after temperature equalisation.
Application areas
For refractive-index and concentration measurements, mixing-ratio determination, sample identification and purity checks in liquid samples, including pharmaceutical, beverage, food, sugar and sweetener, chemical, flavour and fragrance, petrochemical, automotive, cosmetics and personal-care, water and wastewater, education and research applications.
Calibration standards
The official page lists refractive-index calibration standards at nD 1.3400, 1.3900, 1.4300, 1.4800, 1.5300 and 1.5800 (25 °C); each must be purchased separately according to the calibration requirements.
Related accessories and consumables
- Transparent protective cover and sample cover; the sample cover reduces the influence of extraneous light on measurement.
- CBM910 matrix printer with interface cable, paper rolls and ink ribbon.
- The desiccant cartridge for the DR7000 series is a replacement consumable.
Service support
- Direct expert support from experienced contacts.
- On-site calibration and maintenance service.
- Maintenance contracts available on request.
- DQ/IQ/OQ/PQ qualification services are available on request to support laboratory equipment qualification; the service scope is defined in the agreement.
Selection guidance
DR7100-P and DR7300-P are suitable for routine or high-precision measurements without audit-trail requirements. DR7200-P and DR7400-P are suitable for regulated environments requiring 21 CFR Part 11, EU Annex 11 and complete data traceability. Selection should also consider refractive-index range, measurement accuracy, upper temperature-control limit, data-integrity requirements and sample-contact materials.