HG401

NovaSulf™ HG400 Series H₂S Analysers

• Measurement specific to H₂S
• No interference from other components
• Wide range capability
• Fully configurable between 0-50ppb to 0-100%
• Single point calibration
• Low operational costs
• Touch screen
• Eliminates the need to open the enclosure
• Different cell designs  
• Maximises sensitivity and response times (as low as 10 secs)
• Optional alarm outputs
• Monitors low/high sample flow or paper break/motor failure
• Up to 4 detection modules per controller (low range only)
• Minimises capital investment  
• Multi-streaming capability
• Will control up to 4 streams with one controller
• Compact Flash Card
• Allows for remote evaluation and diagnostics

APPLICATIONS:

With its wide-ranging ability to measure H₂S from % levels down to ppb levels, the HG400 range of H₂S process analysers can be utilised in many process industries, including: Natural gas pipelines Reformer recycle gas Gas processing Offshore gas production Fuel gas monitoring Biogas.

PRINCIPLE OF OPERATION

A reel of paper tape impregnated with lead acetate is exposed to the gaseous process sample in the sample chamber. Hydrogen sulphide (H₂S) in the process sample reacts with the lead acetate, after acidification, to form lead sulphide (PbS), a brown compound that stains the tape. The higher the concentration of H₂S the darker the stain. A focused LED and single photo detector measures the darkening stain and the analyser reports this as a 4-20mA output of the concentration of H₂S. Incremental measurements are made on the same spot until saturation occurs, when the tape is advanced to a fresh portion of tape. This avoids the need for frequent zero or span calibrations.