NOVASULF™ TG400 continuous H2S analyser

The metered sample is mixed with a continuous flowing stream of hydrogen. The mixed gases are heated together in a reducing catalytic furnace at a temperature between 650°C and 1200°C, depending on application, where the sulphur compounds in the sample are converted to H2S.

Using the NOVASULFTM TG series colorimetric analyser, the resulting H2S is measured. Temperature (zero) drift is eliminated in this analyser by the use of a single optical sensor.

Since the patented catalytic element is self regenerating and due to the high hydrogenation and cracking properties of this element, there is absolutely no need for manual or automatic regeneration of the furnace. No carbon build-up occurs in normal operation, even in the case of unsaturated hydrocarbon applications such as ethylene, propylene, butadiene, where full catalytic conversion can be achieved at 650°C, compared to 1200°C with a conventional thermal cracking conversion. This new concept of catalytic conversion, coupled with the field-proven NOVASULF™ H2S analyser, makes the TG SERIES the most state-of-the-art process Total Sulphur Analyser available today.

The benefits of this technology can be summarised as follows:

• Measurement specific to Total Sulphur
  No interference from other components
• Wide range capability
  Measures between 0-250ppb to 0-2000ppm
• Low volume humidifier
  Response times as low as 20 seconds
• Single optical sensor
  Eliminates temperature drift
• No instrument air / N₂ required
  Lowers running costs
• Fibre optic link between housings
  Reduces affects caused by ambient
  temperature swings
• Up to 2 detection modules per controller
  Minimises capital investment
• Multi-streaming capability
  Will control up to 2 streams with one controller

With its wide-ranging ability to measure Total Sulphur and/or H₂S from % levels down to ppb levels, the TG400 range of Total Sulphur process analysers can be utilised in many process industries, including:

Ethylene / Propylene Plants
Reformer recycle gas
Offshore gas production
Fuel gas monitoring
Catalyst protection
Sour gas treatment plants