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IPS-4 Model 881 - 2 Pages

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Catalogue excerpts

PROCESS INSTRUMENTS Model 881-NSL H,S in Sulfur Pit Analyzer Direct Measurement AMETEK's No Sample Line external sample line. The analyzer mounts directly on your sulfur pit lid, eliminating sample line plugging, the number one problem in Claus Plant combines an extraordinary long lamp life (estimated 5 years!) with many innovative features designed to minimize maintenance and increase with anti-clogging blowback features. Any out-of-range condition automatically initiates air blowback to clear the sample system. This feature minimizes the chance of costly downtime by reducing sample line plugging. The analyzer continuously monitors itself for proper operation and has built-in alarm features. 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 the lower explosive limit. To prevent an explosion, most pits are air purged to keep expensive, and most plants run with the safe side. The AMETEK 881 -NSL 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 S02 in the sulfur pit, reasoning that the presence of S02 may indicate an incipient fire. Superior Benefits Direct Process Mounting Design Sample line plugging is the number 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 Mechanical parts will wear and reduce analyzer reliability. The 881- NSL employs a heated air aspirated sample system eliminating the need for moving parts. The detector is solid state with no moving parts. Improved Plant Safety Achieved through continuous the sulfur pit atmosphere to warn of buildup of explosive concentrations of H2S in the space above the liquid Lower Operating Costs Save purge air by using the analyzer safe level by adjusting the purge air Integrated Worldwide Design as compliant with NEC/CSA or ATEX standards as well as other international standards.

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Model 881-NSL H2S in Sulfur Pit Analyzer Methodology: Non-dispersive ultraviolet Measurement Range: 0 to 1% SO2, 0 to 5% H2S typically. Other ranges on request. Accuracy: H2S and SO2: +2% full scale Sensitivity: +0.15% full scale Reproducibility: +1% of full scale Speed of Response: 90% in less than 15 seconds, typical Sample Flow: 2 LPM typical Ambient Temperature: -20OC to 50OC (-4OF to 122OF) Utilities Electrical: 115/230 VAC 50/60 Hz 690W Instrument Air: 490 to 700 kPa (70 to 100 psig) Steam (optional ball valve jacket): 515 to 690 kPa (75 to 100 psig) Outputs: Four (4) 4-to-20 mA, self-powered,...

 Open the catalogue to page 2

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