Volume Meter by TSE Systems

Overview

The Volume Meter by TSE Systems is a computer-controlled volumetric displacement measurement system engineered for precise, non-invasive quantification of volume changes in biological and solid specimens. It operates on the fundamental principle of liquid column displacement: as a specimen (e.g., an edematous rodent paw) is immersed in a sealed, fluid-filled chamber, its volume displaces a corresponding volume of liquid, causing a measurable change in hydrostatic pressure or meniscus level within a calibrated capillary tube. This change is detected by a high-stability, low-drift pressure transducer or optical level sensor—depending on configuration—and converted into digital volume data with sub-microliter resolution. Designed specifically for preclinical inflammation and pharmacology studies, the system supports standardized protocols for paw edema assessment (e.g., carrageenan-induced, CFA-induced models) and complies with core methodological requirements outlined in ISO 10993-11 and OECD Test Guideline 407 for repeat-dose toxicity studies involving local tissue response.

Key Features

• Computer-integrated architecture with real-time acquisition and automated calibration routines
• Measurement range of 0.01–9.99 mL with repeatability better than ±0.5% full scale under controlled ambient conditions
• Modular immersion chamber design accommodating both rat (up to 300 g) and mouse (15–40 g) paws without reconfiguration
• Sealed fluid circuit with temperature-stabilized bath interface (optional integration with external water circulator)
• Direct data streaming to Microsoft Excel via USB 2.0 or RS-232 interface; no proprietary software installation required
• Zero-drift transducer technology minimizing thermal hysteresis and long-term baseline drift
• CE-marked hardware conforming to EN 61326-1 (EMC) and EN 61010-1 (safety for laboratory equipment)

Sample Compatibility & Compliance

The Volume Meter is validated for use with intact, unrestrained rodent hind paws—enabling longitudinal monitoring across multiple timepoints per animal. Its chamber geometry accommodates natural limb positioning while maintaining consistent immersion depth and minimizing hydrodynamic artifacts. Beyond rodent paws, the system supports volume determination of excised tissues (e.g., tumor grafts, lymph nodes), polymer phantoms, and calibration standards (NIST-traceable glass syringes). All measurements adhere to Good Laboratory Practice (GLP) documentation standards: audit trails, user authentication logs, and timestamped raw data files are generated automatically upon export. The device meets essential requirements for regulatory submissions under FDA Guidance for Industry: “Nonclinical Safety Studies for the Conduct of Human Clinical Trials and Marketing Authorization for Pharmaceuticals” (2020) when used in conjunction with validated SOPs.

Software & Data Management

Data acquisition is managed through a lightweight Windows-compatible control module that runs natively on standard PCs (Windows 10/11, 64-bit). The interface provides real-time graphical display of volume vs. time curves, manual trigger points for baseline capture, and configurable averaging windows (1–10 s). Export functionality writes comma-separated values (CSV) and native Excel (.xlsx) files containing raw sensor output, calculated volume, acquisition timestamp, operator ID, and session metadata. No database layer or cloud dependency is involved—ensuring full data sovereignty and compatibility with air-gapped lab networks. For laboratories operating under 21 CFR Part 11 compliance mandates, optional add-on modules provide electronic signatures, role-based access control, and immutable audit trail generation (validated separately per site).

Applications

• Quantitative assessment of acute and chronic inflammatory edema in rodent models
• Pharmacodynamic evaluation of anti-inflammatory compounds (NSAIDs, biologics, kinase inhibitors)
• Validation of novel drug delivery systems targeting peripheral tissue accumulation
• Volumetric characterization of scaffold degradation kinetics in tissue engineering
• Benchmarking of ultrasound or MRI-based volumetric imaging modalities against gold-standard displacement metrology
• Quality control of precision-machined reference standards in metrology labs

FAQ

Is the Volume Meter compatible with automated animal handling stations?
Yes—its digital I/O port supports TTL-level trigger signals for synchronization with behavioral rigs or automated dosing systems.
Can the system measure volumes below 10 µL?
No—the minimum detectable volume increment is 10 µL at full-scale sensitivity; sub-10 µL resolution requires alternative techniques such as micro-capillary gravimetry or laser interferometry.
Does TSE Systems supply validation documentation for GMP environments?
Factory-issued IQ/OQ documentation packages are available upon request; PQ must be performed onsite per user-defined acceptance criteria.
What fluids are recommended for the displacement medium?
Deionized water or 0.9% saline at 22–25°C is standard; glycerol-water mixtures may be used to adjust viscosity for specific dynamic range optimization.
Is service support available outside the EU?
Yes—TSE Systems maintains authorized service partners in North America, Japan, and Australia, with remote diagnostics and on-site calibration services available under annual maintenance agreements.