Acid Gases

This tube can simultaneously measure a range of acid gases – Hydrogen fluoride, Hydrogen chloride, Nitric acid, Hydrogen bromide, Phosphoric acid and Sulphuric acid (HF, HCl, HNO3, HBr, HPO4 and H2SO4).


Sources of acid gases include:

  • Coal burning, including power stations.
  • Industrial processes including fertilizer production.
  • Refrigerants.
  • Waste incineration, particularly plastics.
  • Natural processes, such as volcanoes.


With detection from the low parts per billion (ppb) range and no requirement for a power supply, these acid gas diffusion tubes are an efficient monitoring option. Sampling periods range from 2-4 weeks.

Potential implications of acid gases:

  • Damage to metals, concrete, glass, ceramic etc.
  • Respiratory effects.
  • Possible eye and skin irritation.
  • Burning sensation may occur at very high concentrations.


For more information select the downloads option below to download a copy of our instructions or techsheet for this tube.


This particular tube type cannot be shipped outside of the UK without an export license – Gradko is in no way affiliated with obtaining export licenses.

  • Outdoor air monitoring.
  • Indoor air quality sampling.
  • Perimeter monitoring at industrial facilities.
  • Workplace monitoring during production processe

One tube can be used to measure all the following gases simultaneously: Hydrogen Fluoride, Hydrogen Chloride, Nitric Acid, Hydrogen Bromide, Phosphoric Acid and Sulphuric Acid.


DIF900RTU-RA (DIF901RTU-RA) – Supply and analysis of acid gases tube (differing codes depending on quantity of acid gases chosen from the list)


Tube holders sold separately:

DIF-1000 – Plastic fixing clip

DIF-2000 – 360 mm fixing strap

DIF-2001 – 760 mm fixing strap

DIFSHLTR-S – Shelter for 3 tubes


Analysis is carried out in our UKAS accredited laboratories. Results are provided within 10 working days or can be pre-booked for fast track.

Featured Product

Washers - Pack of 10

These washers fit around the diffusion tubes allowing them to sit comfortable inside our circular clips.

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