Kjeldahl range
COLO.Science — Organic elemental analysis · Kjeldahl
KJELDIG-D250 Kjeldahl Block Digestor
KJELDIG-D250 is a 20-position Kjeldahl block digestor for φ42 mm × 300 mL tubes. The graphite block heats from room temperature +5 °C to 450 °C with ±1 °C accuracy; 10 programs with up to 5 steps each and linear or curve heating let you control foaming and repeat every digestion exactly. The fume collection hood is included, and the optional EXSC5 scrubber neutralizes the acid fumes. The same tubes go directly into every KJELFAST / KJELFASTER unit.
Overview
Applications
- Food and feed: protein digestion of 20 samples per batch.
- Soil, plants and fertilizers: total nitrogen digestion before distillation.
- Water and wastewater: digestion for total Kjeldahl nitrogen (TKN).
- Acid evaporation: pre-treatment for microwave digestion or acid removal after digestion.
Why KJELDIG-D250
- Controlled foaming: step programs with linear or curve heating — foaming is controlled by the method, not by special glassware.
- Open consumables: standard φ42 mm × 300 mL tubes, no proprietary glassware; the same tube from digestion to distillation.
- Safe fume handling: hood with sealed caps, water-jet suction and drip tray included; EXSC5 scrubber as option.
- Protected and supported: over-current, overload and high-temperature protection; installation and training by COLO.Science.
Technical specifications
| Model | KJELDIG-D250 |
| SKU | PRO3575 |
| Instrument type | Kjeldahl block digestor |
| Positions | 20 |
| Digestion tubes | φ42 mm, 300 mL (standard, open format) |
| Temperature range | room temperature +5 °C to 450 °C |
| Temperature accuracy | ±1 °C |
| Heating | graphite block, air-duct insulation |
| Programs | 10 programs, up to 5 steps each |
| Heating profile | linear or curve |
| Display | LCD |
| Fume collection | hood with sealed caps, water-jet suction and drip tray (included) |
| Protection | over-current, overload, high-temperature warning |
| Power supply | 220 V AC ±10 %, 50 Hz |
| Rated power | 3.6 kW |
| Dimensions (W×D×H) | 515 × 421 × 211 mm |
| Weight | 25 kg |
OPTIONS AND ACCESSORIES
Options and accessories for the KJELDIG-D250
Standard delivery: KJELDIG-D250 digestor with fume collection hood. Digestion tubes, catalyst tablets and reagents are ordered separately. Standard delivery is confirmed in the quotation.
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Fume collection hood
Sealed clip-on caps, water-jet suction without electric power and a drip tray against acid corrosion.
Standard delivery
PRO5814
EXSC5 scrubber
Three-stage neutralization: water condensation, alkali, activated carbon; adjustable suction.
Optional
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Digestion tubes φ42 × 300 mL (set)
Standard open-format tubes for all KJELDIG digestors and KJELFAST / KJELFASTER units — one tube from digestion to distillation.
Optional
PRO3574
KJELFAST-K300 distillation unit
Automatic steam distillation, 3–6 min per sample, 0.1–240 mg N; titration separate.
Optional
PRO3573
KJELFASTER-K500 automatic analyzer
Distillation + titration, 2.0 µL/step, 1000 results, integrated printer.
Optional
PRO3571
KJELFASTER-K700 automatic analyzer
Titration during distillation, 1.0 µL/step, adjustable steam, 1800 results.
Optional
PRO3572
KJELFASTER-K900 fully automatic analyzer
10″ touchscreen, 0.2–1.0 µL/step, 21 CFR Part 11, 1 million results, 0.5 L/min water.
Optional
More options and consumables
- Kjeldahl catalyst tablets
- Reagents: sulfuric acid, NaOH 40 %, boric acid with indicator, standard acid
Digestion tubes, reagents and spare parts on request. Full catalogue: Organic elemental analysis catalogue →
Selection guidance
KJELDIG-D250 is selected for routine digestion of 20 samples with programmable heating at the lowest cost. For infrared-graphite heating, 20 programs, a colour screen and a cooling rack choose the KJELDIG-D450.
Configuration checklist
- Samples per batch: 20 tubes × 300 mL.
- Heat-up: for faster infrared heating and a colour screen compare the KJELDIG-D450.
- Fumes: EXSC5 scrubber or a fume cupboard.
- Distillation: K300, K500, K700 or K900 use the same tubes.
Sales and support for international customers
COLO Lab ExpertsPolje ob Sotli 4, SI-3255 Buče, Slovenia
Phone: +386 70 713 437 · Email: sales@colo.si · Web: colo.si
We supply laboratories across Europe directly and through partners. B2B prices are quoted net, excluding VAT.
