Tube - Sulfuric acid 1/a (9) | Draeger

The Dräger Tube Sulfuric Acid 1/a (9) is a short-term, spot-measurement detection tube designed by Dräger for measuring sulfuric acid concentrations in air (as an aerosol form) or resulting from sulfur trioxide in humid conditions.

Key Specifications & Features

• Measurement range: 1 to 5 mg/m³ at 20 °C and 1013 hPa.

• Measurement time: Approximately 100 minutes.

• Standard deviation (accuracy): ± 30% typical.

• Color change mechanism: Reagent layer changes from brown → pink-violet on exposure to sulfuric acid content.

• Reaction principle:
  H₂SO₄ + barium chloroanilate → chloranilic acid + Ba₂SO₄

• Ambient operating conditions:

  • Temperature: 5 °C to 40 °C

  • Absolute humidity: < 15 mg H₂O / L

• Material & construction: The tubes are made of glass, designed for use with Dräger’s pump systems (e.g., the Accuro pump).

• Packaging: Typically supplied as a set of 9 tubes (sometimes listed as 10) per box.

How It Works / Use Case

• The Dräger tube is inserted into a compatible gas-sampling pump (such as the Dräger Accuro). Air is drawn through the tube, causing the internal reagent layer to react if sulfuric acid is present.

• After a defined number of pump strokes (for this model ~100 strokes) the reagent ampoule is broken, the liquid is transferred over the reagent layer, and a small amount is drawn into the indication chamber for final color comparison.

• The length of the color change (brown to pink-violet) corresponds to the concentration of sulfuric acid in the sampled air — enabling a semi-quantitative reading in the range 1–5 mg/m³.

Applications

• Spot checks in industrial environments where sulfuric acid mist or aerosols might be present (e.g., acid-storage areas, pickling baths, aerosol generation from sulfur trioxide + humidity)

• Pre-entry checks for confined spaces, shafts, tanks where sulfuric acid may be present in the air

• Monitoring workplace exposure peaks and leak detection of sulfuric acid aerosols or related by-products

Storage, Shelf Life & Handling

• Shelf life is typically 2 years from date of manufacture (as noted in some distributor specs).

• Store in a dry, cool environment, away from extreme humidity or temperature fluctuations.

• As with all sampling tubes, avoid mechanical shock, protect the glass tube until use.

• Follow relevant safety procedures when sampling environments with acid aerosols — ensure proper PPE (respiratory protection, gloves, goggles) as needed.