Draeger 6728311 Nitric Acid 1/a Detector Tubes (10 tests per box)

Application Range:

• Standard Measuring Range: 5 to 50 / 1 to 15 ppm
• Number of Strokes n: 10 / 20
• Time for Measurement: approx. 2 min / approx. 4 min
• Standard Deviation: ± 10 to 15 %
• Color Change: Blue → Yellow

Ambient Operating Conditions:

• Temperature: 5 to 40 °C
• Absolute Humidity: 3 to 15 mg H2O / L

Reaction Principle:

• HNO3 + bromophenol blue → yellow reaction product

Cross Sensitivity:

• Hydrogen sulfide and nitrogen dioxide in the TLV range do not interfere, however, 50 ppm nitrogen dioxide gives an indication similar to 3 ppm nitric acid.
• It is impossible to measure nitric acid in the presence of other mineral acids.
• Chlorine discolors the indication layer grey, and this makes it difficult to evaluate the nitric acid indication.
• If chlorine is present in the TLV range, this leads to slightly higher nitric acid indications.