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If you operate an H2S analyzer, there are 4 things you must know for successful measurements. If you haven’t considered the 4 steps listed below, it’s likely your gas H2S analyzer is not operating as accurately or as reliably as it could.
1. Check the Material of the Wetted Parts
It’s far too often manufactures of H2S analyzers use wetted parts in their analyzers that readily absorb H2S. When H2S is absorbed into parts materials, a phenomenon called “in-gassing” will occur. In-gassing results when H2S is absorbed in materials before it reaches the detector. This results in lower H2S readings than what is actually in the sample.
Ensure the wetted part materials is inert such as 316L stainless steel or PTFE (Teflon). Stay away from materials such as brass, carbon steel or nickel.
2. Be Aware of False High Readings
You could be experiencing a product shut-in even though your H2S levels are in check and not over your limit. These false high readings or “false positives” are very common in the analyzer industry. False positives occur when the H2S analyzer measures components that “look” similar to H2S but are not actually H2S.
The most common types of interference is ethyl-mercaptan and methyl-mercaptan.
You may be saying to yourself, “we don’t inject mercaptans in our gas, so we are fine.”
However, what many people fail to realize is that mercaptans is naturally occurring in the ground. You may not be aware of the presence of mercaptans in your sample.
The chart below shows which type of H2S analyzer methods suffer from cross-sensitive to components other than H2S.
Westech Industrial’s partner ASI KECO offers the H2S tape method analyzer that never suffers from cross-interference.
3. Process Analyzers Are Only as Good as the Sampling System
It’s easy to focus so much of your time and attention on your analyzer you forget how important the sampling system is. If the sampling system is not set up properly, your analyzer will not perform. Verify the wetted part materials (see step 1), also ensures there are no free liquids getting through the sample lines. H2S is readily absorbed in liquids.
Westech Industrial would be happy to design a sampling system for your analyzer you can call us at 1-800-912-9262 to discuss your requirement.
4. Ensure the Vent Lines Out of the Analyzer are Clear
Back pressure on the analyzer’s vent lines can lead to false high readings. Dirt, debris and bugs can cause back pressure on the vent line. When bugs such as dirt dobbers smell hydrogen sulfide, they think its lunch. When they craw into the sample vent line they die quickly, but this causes back pressure. Be sure to install “bug guard” screens at the end of the analyzer vent to prevent this from happening.
Learn More
Westech’s KECO 600 & 700 Series Total Sulfur in Gas Process Analyzer comes in both general-purpose and explosion-proof configurations, providing an accurate, dependable, low maintenance, and cost-effective sulfur analyzer for quality and process control purposes.
Use the KECO Series 600/700 to Reliably Detect Total Sulfur in Gas Applications such as:
- Alkylation
- Sulfur in Ammonia
- Catalyst Beds/Reformers
- Sulfur in Synthesis Gas
- Sulfur Reports on Flare Headers
Learn more about Westech Industrial’s ASI KECO H2S Analyzers or our Sample Systems by visiting our website at westech-ind.com or call today to speak to one of our technical representatives at 1-800-912-9262 and let us help you find the right solution for your application.
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