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Model 881-NSL Sulfur Pit Analyzer

H2S is entrained in liquid sulfur as it runs into the sulfur pit. Polysulfide compounds in the liquid sulfur break down with time to release H2S. H2S from these sources collects in the vapor space above the sulfur where it could exceed both toxic limits and the lower explosive limit. To prevent a dangerous H2S concentration from accumulating, most pits are air purged to keep H2S levels low. Compressed air is expensive, and most plants run with an excessively low H2S level to be on the safe side. In addition to the H2S hazards, the liquid sulfur itself can catch fire thereby spewing high concentrations of SO2 gas into the vapor space above the liquid sulfur. For safety purposes, it is necessary to monitor the vapor space above the liquid sulfur for H2S and SO2 gases.

The AMETEK 881-NSL (No Sample Line) Sulfur Pit Analyzer measures H2S in the vapor space above the sulfur pit. Substantial cost savings can be made using this reliable analyzer to control the H2S level giving an adequate safety margin. Some customers also want to measure SO2 in the sulfur pit, reasoning that the presence of SO2 may indicate an incipient fire.


Direct Process Mounting Design

Sample line plugging is the number one maintenance problem for all sulfur recovery analyzers. The 881-NSL is installed directly on your sulfur pit lid; sample gas is drawn directly into the analyzer and returned to the process through the same sample tap. There is no need for a costly, heated sample line.

Long Term Reliability

The 881-NSL photometer combines an extraordinary long lamp life (estimated 5 years!) with many innovative features designed to minimize maintenance and increase reliability. The 881-NSL is equipped with anti-clogging blowback features. Any out-of-range condition automatically initiates air blowback to clear the sample system. The 881-NSL employs a heated air aspirated sample system eliminating the need for moving parts thereby increasing system reliability. In addition, the detector is a solid state design with no moving parts. The analyzer continuously monitors itself for proper operation and has built-in alarm features.

Improved Plant Safety

Achieved through continuous monitoring of the H2S and SO2 content in the sulfur pit atmosphere to warn of buildup of explosive concentrations of H2S in the space above the liquid sulfur or the existience of a incipient sulfur fire.
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