IPS-4 Model 881 - 2 Pages

AMETEK

PROCESS INSTRUMENTS

Model 881-NSL H,S in Sulfur Pit Analyzer

Direct Measurement

AMETEK's No Sample Line

technology for the sulfur pit. The

881-NSL has no costly troublesome

external sample line. The analyzer

mounts directly on your sulfur pit lid,

eliminating sample line plugging, the

number one problem in Claus Plant

analysis. 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. 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.

The Need

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

H2S levels low. Compressed air is

expensive, and most plants run with

an excessively low H2S level to be on

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

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

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

monitoring of the H2S content in

the sulfur pit atmosphere to warn of

buildup of explosive concentrations

of H2S in the space above the liquid

sulfur.

Lower Operating Costs

Save purge air by using the analyzer

to control the H2S concentration at a

safe level by adjusting the purge air

flowrate.

Integrated Worldwide Design

The 881-NSL is optionally available

as compliant with NEC/CSA or

ATEX standards as well as other

international standards.

www.ametekpi.com

IPS-4 Model 881
  1. P. 1

  2. P. 2

    Model 881-NSL H2S in Sulfur Pit AnalyzerMethodology: Non-dispersiveultravioletMeasurement Range: 0 to 1% SO2,0 to 5% H2S typically. Other rangeson request.Accuracy:...
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