Environmental analysis digester SpeedDigester

laboratoryKjeldahlinfrared

Product overview
The entry-level infrared (IR) digestion system for Kjeldahl and reflux applications. The two heating chambers can be controlled independently and the optimized chamber design ensures homogeneous heating of samples to prevent foaming and ensure reproducible results.

Key facts

• Max. temperature: up to 580 °C (model-dependent)
• Sample positions: 5–12 (depends on model)
• Typical applications: Total Kjeldahl Nitrogen (TKN), Chemical Oxygen Demand (COD), heavy metals (aqua regia), phosphate, hydroxyproline

Benefits

• Safe operation: sealed suction modules capture harmful fumes; compatible with Scrubber K-415 for neutralization and reduced fume exposure.
• Flexible workflow: supports Kjeldahl and reflux digestion in one system; compatible with BUCHI sample tubes (100 mL, 300 mL, 500 mL) and ISO 6060 requirements for COD/reflux digestions.
• High throughput: fast heat transfer and accelerated cool-down reduce cycle times; option for continuous H2O2 addition to speed up digestions.

Features

• Application versatility: Kjeldahl, micro‑Kjeldahl, COD, hydroxyproline, aqua regia and other reflux digestions — select the appropriate glass assembly.
• Convenient handling: drip tray for safe storage of suction modules and rack storage in cooling position to save bench space.
• Precise control: two independently operated heating chambers; manual continuous temperature control (levels 1–10). Multiple suction module options: standard, with condensate trap (for aqueous samples), with capillary funnels (for accelerated reagent addition).
• Operational safety: sealed suction system and optional Scrubber K-415 for gas neutralization.
• Reduced process time: fast heating/cooling and continuous peroxide addition shorten digestion cycles.

Comparison (summary)
Model — Max. number of samples — Display — Temperature programs — Scrubber control — Temperature range — IQ/OQ
SpeedDigester K-425 — 6 — No — - — - — 70–580 °C — -
SpeedDigester K-436 — 12 — No — - — - — 70–580 °C — No
SpeedDigester K-439 — 12 — Yes — Yes — Yes — 50–580 °C — Yes

Technical specifications

• Models covered: SpeedDigester K-425, K-436, K-439 (SpeedDigester K series)
• Heating: infrared heaters with two independently controllable heating chambers
• Maximum temperature: up to 580 °C (model-dependent; K-439: 50–580 °C; K-425/K-436: typical 70–580 °C)
• Sample capacity: K-425 up to 6 samples; K-436 up to 12 samples; K-439 up to 12 samples
• Sample tube compatibility: BUCHI tubes 100 mL, 300 mL, 500 mL (ISO 6060 compliant for COD and reflux digestions)
• Applications: TKN, COD, heavy metals (e.g. aqua regia), phosphate, hydroxyproline and other Kjeldahl/reflux digestions
• Suction modules: standard; with condensate trap for aqueous samples; with capillary funnels for accelerated reagent addition
• Scrubber compatibility: compatible with Scrubber K-415 (fume neutralization); K-439 supports scrubber control
• Control & display: K-439 includes display and temperature program functionality; K-425/K-436 have continuous/manual controls
• Qualification: IQ/OQ available for K-439
• Throughput improvements: fast heating/cooling and continuous H2O2 addition options to shorten digestion times