ADMA/DLG-Compliant Milk Insolubility Index Analyzer with Precision Stirring System – Model 0876

Overview

The ADMA/DLG-Compliant Milk Insolubility Index Analyzer (Model 0876) is a purpose-built laboratory instrument engineered for the standardized determination of insolubility index (II) in dried dairy products—including skim milk powder, whole milk powder, whey protein concentrate, and ice cream mixes. It operates on the principle of controlled mechanical dispersion followed by gravitational sedimentation and optical evaluation of suspended particulates—fully aligned with the gravimetric and procedural requirements defined in ADMA (Arbeitsgemeinschaft Deutscher Molkerei- und Lebensmitteltechniker e.V.) and DLG (Deutsche Landwirtschafts-Gesellschaft) Method 210 “Bestimmung des Unlöslichkeitsindex von Milchpulver”. The system integrates a precision-engineered stainless-steel stirring assembly, calibrated timing circuitry, and reproducible rotational dynamics to ensure inter-laboratory comparability and regulatory acceptability across EU-based quality control environments.

Key Features

• Stainless-steel stirring shaft and impeller conforming to ADMA/DLG dimensional specifications (Ø 25 mm, 3-blade helical design, 90° pitch)
• Dedicated brushless DC motor with continuous-duty rating and ±1 rpm speed stability at 1,500 rpm nominal
• Programmable digital timer (0–300 s, resolution: 1 s) with audible end-of-cycle alert and automatic motor cutoff
• Integrated sample cup holder with thermal mass stabilization (aluminum alloy, anodized finish) to minimize ambient temperature drift during agitation
• Modular base unit designed for benchtop integration with standard ISO 9001-certified QC workflows and GLP-compliant documentation systems

Sample Compatibility & Compliance

The Model 0876 supports routine analysis of reconstituted milk powders (12% w/v), acidified whey solutions (pH 4.6), and frozen dessert base formulations prior to homogenization. All operational parameters—including stir time (60 s), rotation speed (1,500 rpm), and post-stir settling duration (5 min)—are pre-configured to satisfy ADMA Guideline 210 Rev. 2022 and DLG Testing Protocol No. 2021-087. The instrument’s mechanical architecture has been validated against reference materials traceable to PTB (Physikalisch-Technische Bundesanstalt) certified standards. It meets CE marking requirements under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD), and its construction complies with FDA 21 CFR Part 11 data integrity prerequisites when paired with compliant LIMS or ELN software.

Software & Data Management

While the Model 0876 operates as a stand-alone hardware platform without embedded firmware or touchscreen interface, it is fully compatible with external audit-trail-capable data acquisition systems. Laboratories may integrate the device into validated electronic record environments via RS-232 or optional USB-to-serial adapter (sold separately). Timestamped start/stop signals are output as TTL-level pulses, enabling synchronization with spectrophotometers (e.g., for post-settling supernatant turbidity measurement per ISO 8587) or automated pipetting stations. Full traceability—including operator ID, batch number, ambient temperature/humidity logs, and calibration history—is maintained through externally managed SOP-driven workflows compliant with ISO/IEC 17025:2017 Clause 7.7.

Applications

• QC release testing of industrial-scale milk powder batches against ADMA II limits (≤0.3 mL sediment per 100 mL reconstitute)
• Process optimization support for spray drying and agglomeration lines, correlating insolubility index shifts with inlet/outlet air temperatures and atomizer pressure
• Stability assessment of heat-treated whey fractions during storage under accelerated conditions (40°C/75% RH)
• Method verification studies for laboratories seeking DLG accreditation or participation in ILAC-MRA proficiency testing schemes
• Raw material qualification of imported lactose or demineralized whey powders per Codex Alimentarius STAN 207-1999 Annex B

FAQ

Does the Model 0876 include built-in data logging or PC connectivity?

No—the instrument is a dedicated electromechanical test station without internal memory or native USB/Ethernet ports. Data capture requires external timing devices or integration with LIMS via optional serial interface modules.

Is calibration certification included with shipment?

Yes—a factory-issued calibration certificate (traceable to PTB reference standards) is supplied, covering rotational speed accuracy (±0.5% at 1,500 rpm) and timer deviation (±0.2 s over 60 s interval).

Can the stirring assembly be autoclaved?

The stainless-steel impeller and shaft are autoclavable at 121°C for 20 minutes; however, the motor housing and control electronics must not be exposed to steam sterilization.

What maintenance intervals are recommended?

Motor bearing lubrication every 12 months; annual verification of timer accuracy and rotational speed using certified tachometer and stopwatch; visual inspection of impeller surface finish before each shift.

Is this instrument suitable for ISO/IEC 17025 accredited laboratories?

Yes—when operated within documented SOPs, supported by metrologically valid calibration records, and integrated into a controlled document management system, the Model 0876 fulfills technical requirement clauses 6.4 (equipment) and 7.7 (results reporting) of ISO/IEC 17025:2017.