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Product Details
Product Introduction
The HM-DK3 is a handheld headspace gas analyzer from HM Instruments that measures all three principal gases found inside sealed packaging — oxygen, carbon dioxide and nitrogen — in a single sampling cycle. Oxygen is detected by an electrochemical sensor with 0.01% resolution and ≤±0.2% accuracy, while carbon dioxide is measured by an infrared absorption sensor whose lifespan exceeds 15 years. Nitrogen content is then calculated as the complementary fraction (N2 = 100% − O2% − CO2%), delivering a complete headspace composition without the need for a separate nitrogen detector.
This triple-gas capability makes the HM-DK3 headspace gas analyzer the most comprehensive model in the DK series. It is the instrument of choice when modified atmosphere packaging uses nitrogen flushing, when pharmaceutical ampoules and blisters require residual oxygen verification, and when food producers need to confirm that the entire gas mixture inside a package meets specification. A built-in pump draws less than 5 ml for O2 and less than 15 ml for CO2 per test, and results are available within 15–20 seconds. The 3000 mAh lithium battery supports up to 8 hours of continuous field use, and 2000 data sets are stored in circular memory with USB export.
Applications
- Flexible packaging — coffee bags, cheese pouches, milk tea sachets, milk powder pouches, bread packaging
- Modified atmosphere packaging (MAP) — nitrogen-flushed trays for fresh meat, ready meals and bakery products
- Rigid containers — canned coffee, canned milk powder, canned food, Tetra Pak cartons, beverage bottles
- Pharmaceutical packaging — ampoule top-gas O2 testing, blister pack seal integrity, nitrogen-flushed vials
- Quality laboratories — incoming packaging inspection, shelf-life validation, supplier gas-flush verification
Functional Performance and Features
- Triple-gas detection in one pass: O2, CO2 and N2 reported simultaneously for complete headspace composition.
- Electrochemical O2 sensor: 0–100% range, 0.01% resolution, ≤±0.2% accuracy, response within 15 seconds.
- Infrared CO2 sensor: 0–100% range, 0.01% resolution, accuracy ±(0.03% + 5% of indicated value), lifespan over 15 years.
- N2 calculated as the complementary fraction, requiring no separate nitrogen sensor or calibration gas.
- Handheld ergonomic design weighing only 450 g for true single-handed operation on the production floor.
- Quick-insertion needle protective sleeve prevents accidental puncture and protects the sampling needle between tests.
- Built-in gas and pressure sensors with imported brand components for long-term measurement stability.
- One-button operation for measurement, two-point calibration and remote firmware upgrade.
- Chinese-English one-click language switch for multilingual production environments.
- 2000-record circular USB storage with power-off memory — no data is lost on battery depletion.
Technical Parameters
| Item | Specification |
|---|---|
| O2 Sensor | Electrochemical, range 0–100%, resolution 0.01%, accuracy ≤±0.2%, response ≤15 s, sampling <5 ml, lifespan ~2 years |
| CO2 Sensor | Infrared absorption, range 0–100%, resolution 0.01%, accuracy ±(0.03% + 5% of indicated value), response ≤20 s, sampling <15 ml, lifespan >15 years |
| N2 Measurement | Calculated: N2 = 100% − O2% − CO2% |
| Sampling Method | Built-in pump suction |
| Calibration Intake Pressure | 700–1500 mbar (abs.) |
| Calibration Method | Two-point calibration |
| Data Storage | 2000 sets circular storage |
| Data Transmission | USB interface |
| Battery | Built-in 3000 mAh lithium battery, up to 8 hours |
| Working Temperature | 0–40 °C |
| Operation Language | Chinese-English one-click switch |
| Reference Standard | JJG 365-2008 |
| Size | 180 × 106 × 80 mm |
| Weight | 450 g |
Expert Review
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