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Metal & Material Analysis / Dedicated Analysis Instruments

CO-204

NDIR Detection
Dual Measurement Range
ISO 925 · ASTM D1796
No Sample Pretreatment

The CO-204 analyzes solid and liquid samples directly — no drying, grinding, or pretreatment required. Combining acid digestion with a high-sensitivity IR (NDIR) cell, the system delivers results in the 0–60% CO₂ range in under 3 minutes. The instrument stops automatically when the reaction is complete.

Request a Quote → Technical Specifications
Equilab CO-204 Carbonate Analyzer
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0–60%
Measurement Range (CO₂ w/w) — Dual Range
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<3 min
Analysis Time (Auto-Stop)
🎯
0.01%
Resolution and Sensitivity
✅
0.1%
Accuracy (at concentrations below 1%)
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0.1–5 g
Sample Weight
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120°C
Analysis Temperature (Crucible Heater)
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3 Standards
UNE 80-217-91 · ASTM D1796 · ISO 925
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40 kg
Weight — 500×550×600 mm
Equilab CO-204 - Acid Digestion and IR Detection

Measurement Principle

Acid Digestion and Infrared Detection

The CO-204 decomposes carbonates using sulfuric acid and measures the released CO₂ with a high-sensitivity NDIR cell. A Peltier cooler and anhydrone filter keep the gas stream completely dry before it reaches the detector.

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Acid Digestion
20% sulfuric acid is dosed by peristaltic pump and the sample is heated to 120°C with magnetic stirring. The instrument stops automatically when the reaction is complete.
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Peltier Cooler
Moisture and acid vapors that could damage the IR cell are condensed and removed by the Peltier cooler before the gas stream proceeds.
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Anhydrone Filter
Residual trace moisture after condensation is fully captured by the anhydrone filter. Only dry, purified CO₂ reaches the IR cell.
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NDIR Detector
CO₂ is carried to the IR cell by a nitrogen carrier gas and quantified by non-dispersive infrared (NDIR) absorption — a method that maintains consistent sensitivity across the full range.

Frequently Asked Questions

What You Wonder About

No. The CO-204 analyzes solid and liquid samples directly, with no pretreatment steps required. This capability significantly accelerates laboratory throughput.

CO₂ released by sulfuric acid digestion is transported to the IR cell by a nitrogen carrier gas and quantified by non-dispersive infrared (NDIR) absorption. The method maintains consistent precision at both low and high concentrations.

No. The Peltier cooler condenses moisture and acid vapors; the anhydrone filter then captures any remaining trace moisture. Only dry CO₂ reaches the IR cell — this design ensures long-term instrument reliability.

Yes. The dual measurement range (0–5% and 5–60% CO₂) handles both low-concentration slurry samples and samples approaching 100% carbonate content, such as limestone. Range selection is managed through the software.

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