Automatic Density Meter LBDM-A13

Labtron’s Automatic density meter LBDM-A13 use an oscillating U shaped tube crafted from glass, metal, or alloy. The device excites the tube to vibrate at its natural resonance, and when the sample fills the tube, the added mass decreases the oscillation frequency. Because only the liquid between the fixed nodes vibrates, the volume is constant, reducing errors. Modern meters enhance accuracy by using pulsed or dual-mode excitation and compensation algorithms that correct for tube aging, non-linearity, and temperature drift.

Labtron supplies premium automatic density meter LBDM-A13.Thick or viscous fluids dampen the U tube's oscillation, which can lead to a falsely high density reading. Advanced meters measure this damping in both the fundamental resonance and first harmonic, then apply calibration curves to correct the effect. For instance, Anton Paar devices now use a pulsed excitation method that improves viscosity handling compared to traditional forced oscillation systems. As a result, viscosity-induced errors are reduced to below 0.001 g/cm³ even in samples like olive oil or concentrated glycerol, ensuring accurate measurements across a wide viscosity range.

Labtron supplies premium automatic density meter LBDM-A13. Density is highly temperature-dependent so automatic density meters integrate Peltier or thermostatically-controlled modules to maintain sample temperature within ±0.02?°C. They monitor the tube’s temperature continuously and adjust heating or cooling as needed during the measurement. After stabilization, software corrections standardize the result to a reference temperature (e.g., 20?°C). Units with pulse excitation also include rapid heating/cooling features for faster turnaround while maintaining thermal accuracy.

Labtron supplies premium automatic density meter LBDM-A13. Air bubbles as small as 1mm can distort density readings by 0.00005g/cm³. To prevent this, advanced meters incorporate high-resolution cameras aimed at the U tube to detect bubbles in real time. When bubbles are found, the instrument automatically pauses measurement, warns the operator, and only proceeds once the tube is clear. Brands like Anton Paar and Rudolph offer features like to ensure clean liquid fills-even for dark or viscous samples where visual inspection is difficult.

Calibration starts with measuring at least two certified reference fluids, typically air and degassed water, to establish the constants A and B as per standards like ISO 15212 1 or ASTM D7777. Routine verification such as daily checks with pure water at 20 °C—monitors drift within tight tolerances (e.g, ± 0.0001 g/cm³). Many meters include audit trails, timestamps, electronic signatures, and secure data storage to meet GLP/cGMP and 21 CFR Part 11 requirements. Recalibration is typically scheduled annually or triggered by notice of drift, ensuring full traceability and compliance with regulatory standards.