MPD V-1200 Visible Spectrophotometer

Overview

The MPD V-1200 Visible Spectrophotometer is a precision single-beam optical instrument engineered for quantitative and qualitative analysis in the visible spectral region. Operating on the principle of Beer–Lambert law-based absorbance measurement, it delivers reliable photometric data across a wavelength range of 325–1000 nm—covering the full visible spectrum (400–700 nm) and extending into near-UV and near-NIR regions. Its fixed 4 nm spectral bandwidth ensures adequate resolution for routine applications such as concentration determination, kinetics monitoring, and colorimetric assay validation. Designed with a tungsten halogen lamp as its sole light source and a high-stability silicon photodiode detector, the V-1200 eliminates complexity associated with dual-lamp systems while maintaining robust signal-to-noise performance under standard laboratory conditions. The instrument’s automatic wavelength scanning and internal calibration routines support reproducible operation without manual intervention, making it suitable for QC laboratories, teaching facilities, and R&D environments where operational simplicity and long-term stability are prioritized.

Key Features

• 128 × 64 dot-matrix LCD display with 0.1 nm wavelength resolution, enabling real-time visualization of absorbance spectra, standard curves, regression equations (including correlation coefficient r²), and up to 200 stored measurement records
• Onboard memory retains 100 pre-calibrated standard curves and 200 test datasets—eliminating dependency on external storage during transient power loss or network interruption
• USB 2.0 interface compliant with USB Mass Storage Class (MSC) protocol, facilitating direct data export to Windows-based PCs without proprietary drivers; compatible with MPD’s optional UVWin software for advanced curve fitting, multi-point calibration, and report generation
• Optical system incorporating a 1200 lines/mm holographic grating and precision-aligned collimating optics, optimized for minimal stray light (<0.3% at 360 nm) and consistent photometric linearity
• Automated wavelength initialization and self-check at startup, including lamp status verification and zero-point validation using internal reference surfaces
• Spacious sample compartment accommodating cuvettes from 5 mm to 100 mm pathlength—including standard 10 mm square cells, semi-micro cells, and flow-through cells with optional adapters
• Plug-and-play tungsten lamp module with standardized socket interface; no optical realignment required after replacement—reducing maintenance downtime and technician dependency

Sample Compatibility & Compliance

The V-1200 supports aqueous, organic, and mixed-solvent samples in standard quartz, glass, or plastic cuvettes. Its 325–1000 nm range enables analysis of dyes, transition metal complexes, biological chromophores (e.g., hemoglobin, chlorophyll derivatives), and industrial pigments. While not designed for regulatory-grade compliance per se, the instrument meets foundational requirements for ISO/IEC 17025-accredited testing labs when operated within documented SOPs. Its stable photometric output (±0.002 A over 2 hours at 546 nm) and traceable wavelength accuracy (±1 nm, verified against NIST-traceable holmium oxide and didymium filters) support method validation per ASTM E275, ISO 6223, and USP . Data integrity is reinforced by timestamped internal logging and non-volatile memory retention—even during AC power cycling.

Software & Data Management

The V-1200 operates autonomously but integrates seamlessly with MPD UVWin Professional software (Windows 10/11, 64-bit) via USB. This application provides GLP-compliant features including user-access-level control (admin/operator modes), electronic signature support, audit trail generation (per FDA 21 CFR Part 11 Annex 11 guidelines), and customizable report templates aligned with ISO 15197 or CLIA requirements. Raw absorbance/time-series data export is supported in CSV, TXT, and XML formats—ensuring compatibility with LIMS platforms and statistical tools such as JMP, Minitab, or Python-based analysis pipelines. All firmware updates are delivered via signed HEX packages with checksum verification to prevent unauthorized modification.

Applications

• Routine quantification of analytes in environmental water testing (e.g., nitrate, phosphate, iron via colorimetric methods)
• Enzyme kinetics assays (e.g., NADH/NADPH oxidation at 340 nm) and protein concentration estimation (Bradford, Lowry, BCA)
• Pharmaceutical excipient purity screening and dissolution profile monitoring (USP )
• Food & beverage quality control—color value (CIE L*a*b*), turbidity (Formazin equivalents), and additive concentration
• Academic instruction in analytical chemistry, including Beer’s law verification, equilibrium constant determination, and multicomponent analysis using additive absorbance models

FAQ

Does the V-1200 support wavelength scanning across its full 325–1000 nm range?

Yes—it performs continuous or stepwise scanning with programmable increment (0.1–10 nm), storing up to 500 data points per scan.
Is the instrument compliant with FDA 21 CFR Part 11 for electronic records?

Standalone operation does not include Part 11 controls; however, when used with UVWin Professional software configured with audit trail, role-based access, and digital signatures, it satisfies applicable elements of Part 11 and EU Annex 11.
Can I use quartz cuvettes below 350 nm?

No—the V-1200 is a visible-range spectrophotometer only; its tungsten lamp output diminishes significantly below 350 nm, and the optical coatings are not optimized for deep-UV transmission.
What is the typical warm-up time before photometric measurements?

Less than 15 minutes for thermal stabilization; wavelength and photometric calibration are recommended after 30 minutes of continuous operation.
How often does the tungsten lamp require replacement?

Rated lifetime is ≥2,000 hours under normal usage; output drift exceeding ±0.005 A/hour at 546 nm indicates lamp aging and warrants replacement.