Specification builder · Tier B
Laboratory UV-Visible spectrophotometer (double-beam, single-beam or array) with data-integrity software
A UV-Vis spectrophotometer measures how much ultraviolet and visible light a liquid (or solid) sample absorbs, which tells you how much of a substance is present and helps confirm its identity. In Pakistan it is bought by pharma QC labs and drug testing labs (assay, identification, dissolution), by clinical and university research labs (DNA/protein, kinetics) and by food and water labs (nitrate, phosphate, colour tests). The key choices are optical design, spectral bandwidth, stray-light performance and whether the software is compliant with data-integrity rules.
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Standards this specification draws on
- Ph. Eur. 2.2.25 Defines the wavelength, photometric, stray light and resolution tests a UV-Vis instrument must pass in European/BP-following labs.
- USP <857> USP chapter on qualification of UV-Vis spectrophotometers (wavelength, photometric accuracy, stray light, resolution) used by many Pakistani pharma labs.
- USP <1857> Explains the theory and practice behind the <857> performance tests.
- BP Appendix II B / JP 2.24 British and Japanese pharmacopoeia UV-Vis requirements, aligned with Ph. Eur. / USP.
- USP <1058> Framework for analytical instrument qualification (DQ, IQ, OQ, PQ).
- 21 CFR Part 11 / EU GMP Annex 11 Electronic records, audit trail and e-signature requirements for software in GMP labs.
- WHO TRS 1033 Annex 4 (data integrity) WHO guidance on good data and record management that DRAP/PIC/S-aligned inspections follow.
- ISO 17034 / ISO/IEC 17025 Accreditation of reference material producers and calibration labs supplying the certified filters and solutions.
- ASTM E275 / ASTM E387 Methods for describing and measuring spectrophotometer performance and stray light.
- IEC 61010-1 / IEC 61326-1 Electrical safety and EMC for laboratory equipment.
Common mistakes in tenders for this equipment
- Copying one brand's numbers exactly (for example a fixed 1.5 nm bandwidth, a 29,000 nm/min scan speed, a 10-year lamp guarantee or 8-position Peltier multicell) so only that model complies; specify the minimum performance instead.
- Using proprietary feature names (special grating names, 'focused beam geometry', branded linearity checks) in the specification instead of measurable performance.
- Asking for stray light at very low levels (for example 0.00008 %T or 8 Abs range) that only double-monochromator research instruments meet, when the lab only runs pharmacopoeial assays.
- Accepting 'Part 11 compatible' or 'Part 11 ready' without requiring audit trail, unique logins and e-signatures to be demonstrated at installation, or finding out later that the compliance module is a separately priced licence.
- Leaving out certified reference materials, IQ/OQ and spare lamps, so the instrument cannot be qualified or sits idle for weeks after the first lamp failure.
- Specifying 'double beam' only by name; some split-beam or reference-monitored designs perform equally well, so judge them by drift and pharmacopoeial tests.
- Ignoring post-warranty service cost; a low bid followed by an expensive AMC and single-source xenon lamp can cost more over 5 years.
- Requiring a 185 nm lower limit, which needs nitrogen purging to be useful and favours a few models without benefit for routine work.