DEMISTER Probe
The DEMISTER sampling probe was designed to be lightweight and compact, so it can easily be installed by a single technician. The probe is mounted on the process pipe via flange.
The actual interaction between the sample gas and the light signal occurs in the flow cell disk within the probe head, where fiber optic connections on opposite ends transmit light across the path length of the disk.
Automatic Sulfur Vapor Removal
Tail gas contains elemental sulfur which is quick to condense and plug mechanical cavities or obstruct optical signals. The DEMISTER Probe removes sulfur from the rising sample as an internalized function within the probe body. Recycling the steam generated by the Claus process, the probe controls the temperature along its body at a level where all sulfur vapor in the rising sample condenses and drips back down to the process pipe.
Inside the probe, an internal ‘demister’ chamber (concentric to the probe body) is fed with low pressure steam. Since the LP steam is much cooler than the tail gas, this chamber has a cooling effect on the rising sample. Elemental sulfur has the lowest condensation point of all of the components in the tail gas. Due to the internal probe temperature maintained by the LP steam, all of the elemental sulfur in the rising sample is selectively removed by condensation while a high-integrity sample continues upward for analysis in the probe head.
The point of interaction between the light signal and the sample gas occurs in the flow cell disk inside the probe head. The flow cell disk has a built-in HP steam channel to heat the cell and ensure that any present sulfur remains gaseous—eliminating the possibility of condensation on the optical windows.
An aspirator creates a Venturi effect which pulls the sample up the probe body intake path, through the flow cell for analysis, and down the return line. The used sample is released back into the process pipe.
System Overview
Utility Control Panel
The Utility Control Panel (UCP) regulates utilities going to the DEMISTER sampling probe for the TLG-837. The UCP is optional; the customer can decide to purchase the UCP from Applied Analytics or build your own integration panel. View datasheet
- Regulates LP steam pressure for demister chamber in probe body
- Regulates HP steam pressure for flow cell steam tracing in probe head
- Provides zero gas for Auto Zero sequence
- Provides span gas in case Auto Span is desired
- Controls aspirator flow rate
- Provides steam failure blowback feature: in the event of faulty steam utilities, the flow cell disk is sealed from the sample and the cell is purged with nitrogen from the UCP
Ultra-Safe Design
The major safety flaw of other tail gas analyzers is that they bring the toxic sample fluid into the analyzer enclosure for analysis. Not only does this practice expose the system electronics to higher corrosion effects, it also poses a lethal threat: if there is any leak in the instrument — especially inside a shelter — the human operator is placed at enormous risk.
The key difference between the TLG-837 and other tail gas analyzers is the use of fiber optic cables: we bring the light to the sample instead of bringing the sample to the light. The toxic sample only needs to circulate through the probe, and never enters the analyzer electronics enclosure.
- No danger of leaks inside the analyzer because the tail gas does not enter the analyzer enclosure
- No need for a shelter — system designed for outdoor environment
- Custom fiber length up to 6 meters allows for distance between analyzer and probe
- User can safely perform service on the analyzer while process is running — no exposure to sample gas
- Digital link (e.g. Modbus) provides additional process data during any upset conditions — personnel do not need to physically visit the analyzer during potentially dangerous situations
- Full port 2” ball valve provides process seal, allowing isolation and removal of probe while process running
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