Organic elemental analysis: Kjeldahl analyzers, digestors and scrubbers for nitrogen and protein determination
Kjeldahl analysis is the reference method for total nitrogen and crude protein in food, feed, soil, fertilizers, water and pharmaceuticals. A complete system has three steps: digestion of the sample in sulfuric acid, steam distillation of the released ammonia and titration. COLO.Science supplies every part of that workflow — block digestors with fume collection, acid-fume scrubbers, a distillation unit, automatic analyzers with integrated titration and an autosampler for unattended batches. This category helps you select by automation level, sample throughput and data requirements.
Category structure (navigation hub)Lab equipment — general laboratory instruments and systemsOrganic elemental analysis — Kjeldahl digestion, distillation and titrationAutomatic Kjeldahl analyzers — KJELFASTER-K500, K700 and K900 with integrated titrationKjeldahl distillation unit — KJELFAST-K300, titration done separatelyKjeldahl digestors — KJELDIG-D250 and D450, 20 × 300 mL tubes up to 450 °CScrubber — EXSC5 neutralization of acid fumes from digestion
Types of Kjeldahl equipment and their useBlock digestor — digests up to 20 samples at once in concentrated sulfuric acid with a catalyst; programmable linear or curve heating up to 450 °C converts organic nitrogen to ammonium sulfate.Scrubber — connected to the fume collection hood of the digestor; condenses, neutralizes and filters the acid fumes so digestion can run safely outside a large fume cupboard.Distillation unit — releases ammonia by steam distillation after automatic alkali dosing and collects it in boric acid; the distillate is titrated manually or with a separate titrator.Automatic Kjeldahl analyzer — distillation, colorimetric titration, calculation and printout in one instrument, 0.1–240 mg N with recovery ≥99.5 %.Fully automatic analyzer with autosampler — 10″ touchscreen, 21 CFR Part 11 user management, LAN and Wi-Fi, with a 24-position autosampler for unattended batches.
Highlight: choosing the analyzerThe analyzer is chosen by daily sample number and required documentation. For occasional samples the KJELFAST-K300 distillation unit with manual titration is sufficient; routine food and feed laboratories choose the KJELFASTER-K500 or K700 with integrated titration and printout.Accredited and high-throughput laboratories choose the KJELFASTER-K900 with audit trail, network connection and the optional 24-position autosampler. Every system is completed with a KJELDIG digestor and the EXSC5 scrubber.
Main navigation for Kjeldahl systemsOrganic elemental analysis overviewOrganic elemental analysis catalogue
Kjeldahl systemsAutomatic analyzersDistillation unitDigestorsScrubber
Enquiry and technical supportRequest a quotationHelp configuring the digestor, scrubber and analyzer — tell us the sample types and daily number of samples.