2-2 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Response Time
Dependent on sample gas flow rate and operator-adjustable filtering time
constants. Typically less than 30 seconds to T
90
(excludes sample system).
Accuracy
Accuracy is determined by comparing analyzer response to a known stan-
dard gas after a calibration has been performed.
SO
2
, H
2
S: ± 1 % of full-scale of standard ranges
Model 900 only:
Air Demand: ± 0.04F Air Demand
COS, CS
2
: 10 % of full-scale of standard ranges
F is a constant for a given plant which depends upon the acid gas
composition. For acid gas H
2
S concentrations ranging between 30 %
and 100 %, F ranges between 5.25 and 3.0. Specifications are for con-
centration ranges and conditions that normally exist in sample gas
streams of conventional modified Claus plants.
Repeatability
SO
2
, H
2
S: < 0.5 % of full-scale of standard ranges
Model 900 only:
Air Demand: ± 0.02F Air Demand
COS, CS
2
: 1 % of full-scale of standard ranges
See Note (Re: "F is a constant...") under “Accuracy.”
Calibration
Generally not required. Field calibration not recommended, except by fac-
tory trained technician.
NOTE
NOTE
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