DualSulf Process Total Sulphur and H2S Analyser

Measures both total sulphur and H2S in gases.

DualSulf Process Total Sulphur and H2S Analyser

Duty: To measure the concentration of both HS and total sulphur simultaneously in a process gas stream.

The metered process sample is split into two arms. One arm is directed to a detection module where the HS is measured using interference free ASTM approved tapes.

The second arm is mixed with a continuous flowing stream of hydrogen. The mixed gases are heated together in a reducing furnace at a temperature between 650-1050°C (depending on application), where the sulphur compounds are converted to HS. A catalyst is utilised in the furnace to aid conversion in some applications. The resulting HS is measured using interference free ASTM approved tapes. 

Since the patented catalytic element is self-regenerating, there is no need for manual or automatic regeneration of the furnace. No carbon build-up occurs in normal operation, even in the presence of unsaturated hydrocarbons.

The local LCD display provides the current HS / total S readings, alarms if any and failure indicators.

The benefits of this technology can be summarised as follows:

·         Separate channels for both HS and total sulphur, reducing capital expenditure

·         The instrument has a wide range capability, measuring between 0-250ppb to 0-2000ppm total sulphur

·         Self-regeneration of catalyst reducing downtime.  

 

  • Configuration of the system is via a touch screen which eliminates the need to open the enclosure.
  • Both measurements are made simultaneously, not sequentially as with other manufacturers
  • A compact flash card allows for remote evaluation and diagnostics
  • Suitable for gas group IIC environments.
  • Dual stream capability

 

With its wide-ranging ability to measure total sulphur in gases 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

ANALYSER: 

 

 

 

Measurement principle 

:

Conversion of sulphur compounds to HS and subsequent measurement of the HS using colorimetric techniques. Simultaneously, the HS in the process stream is also measured. 

 

Software 

 

:

 

C++ Windows XPe based

 

Measurement range 

:

Between 0-250ppb HS to 0-2000ppm HS/total sulphur 

 

Repeatability 

 

:

 

± 2% full scale

 

Response time

 

:

 

Depends on application but typically 30secs for 0-10ppm range

 

Output 

 

:

 

2 x 4-20mA

Modbus for alarms and regeneration

 

Alarms 

 

:

 

1 x measurement alarm

 

:

1 x instrument failure alarm

 

:

Optional low flow alarm

 

:

Optional paper break/motor failure alarm

 

Area classification 

:

ATEX approved, Ex d [ia] IIC T4 

 

Ambient temperature 

:

-20°C to +40°C 

 

Tape life 

 

:

 

Up to 60 days depending on application.

 

Weather protection 

:

IP66

 

 

 

     

UTILITIES 

   

Power

:

120 / 240 VAC 50 / 60 Hz, 49VA

 

Sample 

 

:

 

Pressure 4.0 to 6.0 barg

 

:

Flow 0.1 to 0.5 l/min

 

:

Temperature 40°C max

 

 

 

Hydrogen

:

100-250 cc/min

 

Inst. Air

:

 

100-500 cc/min (for furnace regeneration)

Nitrogen

:

100-500 cc/min (for furnace regeneration) 

 

 

 

     
     

INSTALLATION 

   

Process connections

:

¼” NPT female vent, ½” NPT to atmospheric drain

Analyser vent 

:

To Atmospheric, no back pressure

Weight 

:

150 Kg

Dimensions 

:

1100(w), 1700(h), 300(d) mm