ATAGO PR-40DMF Digital Handheld Refractometer for Dimethylformamide (DMF) Concentration Measurement
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | PR-40DMF |
| Type | Handheld Refractometer |
| Measurement Range | 0.0–40.0% (w/w) DMF in aqueous solution |
| Accuracy | ±0.3% |
| Digital Display | Yes |
| Temperature Compensation | None |
| Compliance | Designed per JIS K 0061 and ISO 21748 (Refractometric analysis — Guidelines for the determination of measurement uncertainty) |
Overview
The ATAGO PR-40DMF is a precision-engineered handheld refractometer specifically calibrated for the rapid, on-site quantification of dimethylformamide (DMF) concentration in aqueous process solutions. Utilizing the fundamental optical principle of critical angle refractometry—where the refractive index of a liquid sample is determined by measuring the angle at which light transitions from prism to sample—the instrument delivers direct % (w/w) readouts without requiring dilution, calibration curves, or external software. Its optical path is optimized for the refractive index dispersion profile of DMF–water mixtures across the 0.0–40.0% (w/w) operational range, ensuring high linearity and minimal matrix interference under typical industrial handling conditions. Engineered for field deployment in chemical manufacturing, solvent recovery units, and QC laboratories, the PR-40DMF features a robust aluminum alloy body, scratch-resistant sapphire prism, and sealed optical chamber resistant to organic solvent vapors and incidental splashes.
Key Features
- Factory-calibrated scale for direct % (w/w) DMF concentration—no user calibration required
- Dual-wavelength LED illumination system with automatic brightness adjustment for consistent contrast under variable ambient lighting
- Large, high-contrast LCD display with backlight (activated manually) for legibility in low-light environments
- Integrated temperature sensor for real-time ambient temperature monitoring (displayed alongside measurement), supporting manual correction per ASTM D1218 guidelines
- Ergonomic, one-handed operation with non-slip rubberized grip and recessed sample well to minimize spill risk
- IP65-rated enclosure for resistance to dust ingress and water jets—suitable for use in production floors and fume hoods
- Battery life exceeding 10,000 measurements on two standard AAA alkaline cells; auto-power-off after 3 minutes of inactivity
Sample Compatibility & Compliance
The PR-40DMF is validated for use with homogeneous, non-turbid DMF–water solutions at temperatures between 10 °C and 40 °C. It is not intended for viscous, particulate-laden, or highly volatile samples (e.g., neat DMF or mixtures containing >5% methanol). The instrument conforms to Japanese Industrial Standard JIS K 0061 (General rules for refractometric analysis) and aligns with ISO 21748 for uncertainty estimation in refractometric measurements. While it does not incorporate active temperature control, its built-in temperature sensor enables traceable ambient condition logging—a prerequisite for GLP-compliant recordkeeping. For regulated environments, users may document ambient temperature alongside each reading to satisfy internal SOPs referencing USP or Ph. Eur. 2.2.27.
Software & Data Management
The PR-40DMF operates as a standalone, embedded-system device with no Bluetooth, USB, or data export capability. All measurements are displayed and retained only on-screen during active use; no memory or audit trail is maintained internally. This design prioritizes operational simplicity, regulatory neutrality, and long-term reliability—eliminating firmware update dependencies or cybersecurity vulnerabilities associated with connected instruments. For laboratories requiring electronic record retention, manual transcription into LIMS or Excel-based logbooks is recommended. The absence of digital connectivity ensures full compliance with environments where electromagnetic isolation or air-gapped instrumentation policies apply (e.g., certain GMP cleanrooms or defense-related facilities).
Applications
- Real-time verification of DMF concentration in spent solvent streams prior to distillation or membrane separation
- Batch release testing of DMF-based reaction media in pharmaceutical intermediate synthesis
- In-process monitoring of DMF content in polymer dissolution tanks (e.g., polyacrylonitrile or polyimide precursor solutions)
- Quality assurance checks of purchased DMF–water blends used in coating formulations or etching baths
- Educational demonstration of refractive index–concentration relationships in analytical chemistry labs
FAQ
Does the PR-40DMF require periodic recalibration?
No. It is factory-calibrated using NIST-traceable DMF reference standards and designed for zero-maintenance operation over its service life. Users should verify optical clarity of the prism before each use and clean with lens-grade tissue and pure isopropanol.
Can this refractometer measure other solvents besides DMF?
No. The scale and optical compensation are exclusively optimized for DMF–water systems. Using it for ethanol, acetone, or glycol solutions will yield inaccurate results due to differing dispersion characteristics.
What is the minimum sample volume required?
Approximately 0.3 mL is sufficient to fully cover the prism surface; excess liquid is contained within the recessed well.
Is temperature compensation applied automatically?
No. The instrument displays ambient temperature but does not perform automatic temperature correction. Users must consult published DMF–water refractive index vs. temperature tables if measurement occurs outside 20 ± 2 °C.
How is traceability ensured for quality audits?
Each unit ships with a Certificate of Conformance referencing ATAGO’s internal calibration records. No certificate of calibration is included, as the device is classified as a fixed-scale field instrument per ISO/IEC 17025 Clause 6.5.2.
