Specification builder · Tier B
Karl Fischer titrator, volumetric (automatic piston burette, double platinum electrode endpoint, water content from about 100 ppm to 100%)
A volumetric Karl Fischer titrator measures the water content of drugs, excipients, solvents and chemicals by titrating the sample with an iodine-containing reagent until a platinum electrode detects the endpoint. It is a standard instrument in pharma QC and drug testing labs because most pharmacopoeial monographs set a limit for water. The real buying decisions are burette quality, drift control, closed solvent handling for staff safety and whether a KF oven or GMP data-integrity software is needed.
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Standards this specification draws on
- IEC 61010-1 Basic electrical and fire safety of laboratory equipment, including titrators and KF ovens used next to flammable solvents.
- USP <921> Method I Pharmacopoeial water determination by Karl Fischer titration (Method Ia direct volumetric titration; Method Ic coulometric), including titre determination with water or sodium tartrate dihydrate.
- Ph. Eur. 2.5.12 European Pharmacopoeia semi-micro (volumetric) water determination, including the recovery test for suitability of the method.
- BP Appendix IX C British Pharmacopoeia water determination appendix, widely cited in Pakistani monographs and harmonised with Ph. Eur. 2.5.12.
- ISO 760 General Karl Fischer method for determination of water, used for chemicals and raw materials.
- ASTM E203 Standard test method for water by volumetric Karl Fischer titration in liquid and solid chemicals.
- ISO 8655-3 Accuracy and precision limits for piston burettes, used to calibrate the titrator burette.
- USP <1058> Framework for analytical instrument qualification (IQ/OQ/PQ).
- 21 CFR Part 11 / EU GMP Annex 11 Electronic records, audit trail and electronic signature expectations for GMP labs inspected by DRAP.
- IEC 61326-1 Electromagnetic compatibility of laboratory electrical equipment.
Common mistakes in tenders for this equipment
- Copying one maker's brochure: exact step counts (e.g. a very high burette step figure that only one maker quotes), named burette chip systems or named solvent-handling modules instead of performance requirements.
- Asking for a combined volumetric and coulometric instrument when trace water is not routine; it narrows the field to very few makers. Buy a separate coulometric titrator if trace water is needed.
- Leaving reagents, certified water standards and molecular sieve out of the bid, so the titrator cannot be qualified or used after installation.
- Accepting "Part 11 compliant" claims with no audit trail or electronic signature demonstrated at OQ and no compliance matrix.
- Ignoring solvent and fume safety: open solvent changes on an open bench with methanol-based reagents and no closed waste bottle.
- No burette calibration plan: GMP and ISO/IEC 17025 labs need gravimetric burette checks to ISO 8655-3 at installation and every year.
- Asking for DRAP medical device registration, which does not apply to laboratory titrators and wrongly excludes valid bidders.
- Buying an oven without checking carrier-gas drying, vials and septa supply, or the bench and power it needs.