The primary detection technology
of H2S Analyzers by ANALYTICAL
SYSTEMS INTERNATIONAL has three advantages based on the chemistry and physics
involved."No interference" is proven by years of experience with
various applications where no other chemical reaction with lead acetate has
been found to darken the sensing tape except H2S. This ensures that only a
sulfur-specific reaction will occur. "Linear response “indicates that the
rate of tape darkening is linear with respect to the H2S concentration. The benefit of
this response is the straight forward relationship between the measured
variable and quantity units. Equipment maintenance is easier and only a single
point calibration is required. "Parts per billion sensitivity"
relates to measurements that can be made even when the H2S concentration is
only one one-billionth of the total volume. This accuracy benefits the user in
determining acceptable levels that can be monitored.
This detection technology is
applied to a range of product applications. Mathematical formulations and
field-proven results demonstrate the calculation precision that is available.
It is important to note that a
variety of fundamentally different implementations have been applied to lead
acetate chemistry over the years. These fundamental selections of sample
handling, optical coupling, signal detection, and information processing each
have major impact on the system performance. The following descriptions outline
some of the parameters implemented by ANALYTICAL SYSTEMS INTERNATIONAL to achieve
superior performance and easy operation.
• Sample flow is tangent to ASI
Tape to eliminate effects from porosity variations when sample is passed
through the substrate
• Signal generation is based on
H2S concentration only, therefore sample volumetric flow rate does not affect
accuracy
• Calibration options allow
flexibility to match available resources with application requirements
• Spectral correlation of the
optical path for optimum impedance matching has been designed into the system.
• Conversion resolution of the
signal is more than 100 times greater than with previously available
technology.
• ANALYTICAL SYSTEMS
INTERNATIONAL information processing algorithms completely eliminate the
effects of parameter offsets commonly referred to as drift.
• Signal over sampling algorithms
are implemented for statistical detection processing and accuracy correlation
• Full floating point precision
is used to execute all information processing algorithms
• Function keys and local display
provide easy operation selection and direct result display
• Diagnostic program execution
and status alarms contribute to reliable on-line operation
• Plain language displays with
descriptions of operation status support easy operation
