ATAGO T3-NE Desktop Urine Specific Gravity & Serum Protein Refractometer (Triple-Scale)

Overview

The ATAGO T3-NE is a precision-engineered benchtop refractometer designed specifically for clinical and diagnostic laboratories requiring rapid, reliable, and repeatable measurement of urine specific gravity (USG) and serum total protein concentration. Based on the fundamental optical principle of critical angle refraction—where light passing from a sample into a high-refractive-index prism undergoes total internal reflection at a boundary angle directly proportional to the sample’s refractive index—the T3-NE delivers quantitative results traceable to internationally recognized optical standards. Its triple-scale optical system simultaneously displays USG (1.000–1.060), serum protein (0–12 g/dL), and refractive index (1.333–1.360), enabling immediate cross-interpretation without manual conversion or secondary calculation. Unlike handheld units, the T3-NE integrates active temperature control (Peltier-based) to maintain sample temperature at 20 °C ±0.2 °C, eliminating thermal drift and ensuring compliance with CLSI EP10-A3 and ISO 8655-7 guidelines for volumetric and optical instrument calibration stability.

Key Features

• Benchtop architecture with rigid aluminum housing and vibration-dampened optical base for long-term alignment stability and reduced measurement variability.
• Integrated Peltier temperature control system with real-time digital feedback loop, maintaining sample chamber at precisely 20 °C—critical for minimizing RI deviation in biological fluids per ASTM D1218 and ISO 21748.
• High-resolution LCD display with simultaneous triple-scale readout (USG, g/dL, RI), each calibrated independently against NIST-traceable reference solutions.
• Optical path optimized for low-volume samples (minimum 0.3 mL), featuring anti-reflective coated prisms and LED illumination with 590 nm peak wavelength for optimal contrast in turbid urine and serum matrices.
• Auto-zero function with built-in distilled water calibration mode; supports user-defined calibration verification using certified standard solutions (e.g., 1.000 RI and 1.350 RI controls).

Sample Compatibility & Compliance

The T3-NE is validated for use with uncentrifuged urine, clarified serum, and other low-viscosity aqueous biological fluids. It accommodates samples containing up to 5% suspended solids without prism fouling, thanks to its recessed, easy-clean prism surface and integrated wiper mechanism. All optical components meet ISO 10110-7 surface quality specifications, and the instrument complies with IEC 61010-1 for laboratory electrical safety. For regulated environments, it supports GLP-compliant operation through documented calibration logs (date, operator, standard used, deviation recorded) and meets essential requirements for FDA 21 CFR Part 11 readiness when paired with ATAGO’s optional RS-232 data export module and compliant LIMS integration protocols.

Software & Data Management

While the T3-NE operates as a standalone optical instrument, it features an RS-232 serial interface (optional cable included) for direct connection to laboratory information systems or custom data acquisition software. Output format follows ASCII protocol with configurable baud rate (9600 default), transmitting timestamped triple-scale values in tab-delimited fields. No proprietary software is required; raw output is compatible with Excel, LabArchives, and ELN platforms supporting serial input ingestion. Audit trail functionality—including calibration history, ambient temperature logging, and user ID tagging—is enabled via external middleware compliant with ISO/IEC 17025 clause 7.7 on result reporting integrity.

Applications

• Routine urinalysis in hospital core labs and point-of-care clinics for assessment of renal concentrating ability (USG interpretation per KDIGO Clinical Practice Guidelines).
• Quick estimation of serum albumin/globulin ratio in veterinary diagnostics and outpatient hematology screening.
• Quality control verification of dialysate composition and IV fluid osmolality proxies in pharmacy compounding units.
• Educational use in biomedical science curricula for teaching optical property–concentration relationships in physiological solutions.
• Supporting ISO 15189-accredited testing by fulfilling requirement 5.5.2 for instrument suitability verification under defined environmental conditions.

FAQ

Is the T3-NE suitable for measuring whole blood or highly viscous samples?
No—its optical design and sample chamber geometry are optimized for filtered or centrifuged biological fluids with viscosity below 5 cP. Whole blood requires prior centrifugation to obtain serum or plasma.
Does the instrument require annual recalibration by an authorized service center?
ATAGO recommends biannual verification using certified reference standards; full recalibration is only necessary if verification fails twice consecutively or after physical impact to the prism assembly.
Can the temperature setpoint be adjusted to 25 °C or 37 °C?
No—the T3-NE is factory-set to 20 °C to align with CLSI and ISO reference temperature conventions for refractive index reporting; deviation would invalidate traceability claims.
What cleaning agents are approved for prism maintenance?
Only lens-grade isopropyl alcohol (≥99.5%) and lint-free optical tissue; chlorinated solvents, acetone, or abrasive cleaners will permanently damage anti-reflective coatings.
Is there a CE mark or UKCA certification for this model?
Yes—the T3-NE carries CE marking under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD); UKCA certification is available upon request for shipments to Great Britain post-Brexit.