PUSH BUTTON CALIBRATION or

OPTIONAL AUTOMATIC

CALIBRATION (No Attendant Required)

The power and flexibility of the ASI microprocessor-based analysis system is available at the touch of a button to help operators with one of their most important responsibilities…..

Calibration.  The microprocessor, when requested, selects references, performs calculation adjustments, and verifies faster and more precisely than even the most experienced operators.  The unique internal calibrator permits push button selection to quickly and easily verify operation.

ASTM REFERENCE METHODS

The field proven microprocessor technology has been combined with ASTM approved analytical methods.  The reference methods are:

            ASTM D4084-82

            ASTM D4468-85

            ASTM D4045-81

The detection technology is based on chemically specific density changes.  Optical illumination and detection are integrated for maximum resolution accuracy.  Microprocessor technology is combined with statistical software algorithms to calculate precision analysis results.

WORD MENU DISPLAYS

Plain language displays with descriptions of operation status support easy use.  The 128 x 65 pixel LCD display allows selections to be displayed in plain language: English, Spanish and other languages.  The operator can make selections from available menu choices.  This allows the operator to become familiar with the instrument much faster than with other forms of interaction. 

18 BIT A/D CONVERSION

Allows the detection and resolution of smaller signal values.  This means that lower levels of H2S can be detected.  The greater dynamic range of counts up to 262,144 means a wider range of H2S concentration can be measured without recalibration.

DIGITAL ELECTRONICS  

Digital electronics takes full advantage of microprocessor calculation precision.  Data is acquired with 18 bit conversion resolution.  Signal over sampling is applied for statistical detection processing and accuracy correlation.  An extensive set of mathematical algorithms are executed with full floating point precision to calculate the concentration analysis.

FIELD PROVEN

Operator confidence has been earned through exceptional on-line performance.  Reliable operation is an absolute requirement for acceptable performance.  Field proven performance is your assurance that reliability is built into ASI products at every level from initial design to final calibration.  Performance is your assurance of hassle-free compliance certification.  Documented verification of accurate, stable results over an extended, uninterrupted period of operation is required to earn certification.  ASI’s systems have earned certification even in the most aggressive environments.

EASY INSTALLATION

User friendly starts with easy installation.  Gas line connections on the outside of the analyzers are labeled for easy setup.  Straightforward ease of installation allows operators to start recording accurate readings almost immediately.  Easily accessible sub-assemblies and components support used configuration changes, troubleshooting analysis, and validation checks.

OPERATOR KEYPAD

A directly accessible six-function operator keypad allows configuration selection, maintenance control, and operation setup to be quickly and easily executed.

STATUS DISPLAY PAGES

Menu selection that displays current operating status to the unit.

DUAL MICROPROCESSORS

Two independently functioning microprocessor systems are embedded in the analyzer architecture.  This dual processor structure allows one processor to have uninterrupted dedicated execution of the analysis algorithms.  The second processor is dedicated to the user friendly interaction and display.  Dual processor design ensures continuous precision analysis and dedicated responsive communication with interactive displays.  Embedding two microprocessors in the system electronics allows each processor to have a single first priority.  One is dedicated to easy, clear, and responsive information display and operator interaction:  the other processor is dedicated to precision analysis calculation without interruption for communication requests.

TANGENT SAMPLE FLOW

Sample flow is tangent to the tape to eliminate effect from porosity variations when sample is passed through the tape. Signal generation is based on H2S concentration only.  Therefore, the sample’s volumetric flow rate does not affect accuracy.

LEAD ACETATE DETECTOR

The only detection method that is absolutely specific to hydrogen sulfide.  Based on the formation of lead sulfide when lead acetate is exposed to the H2S sample through and aperture in the sample flow system.  This system is totally specific to sulfur.  It is unaffected by the composition of the carrier or sample gas.  Since the product of the reaction of lead acetate and H2S is colored and the reactants are not, the progress of the reaction is easily monitored.  The rate of formation of lead sulfide may be determined by measuring the rate of the tape darkening.  Rate of tape darkening is linear with respect to H2S concentration.

FAULT TOLERANT OPERATIONS

Fault tolerant diagnostics are your assurance of low stress operation.  The system architecture provides extended maintenance tools, such as fault code logging, calibration records and analysis logs, status displays, and many other elections of data.  Even after a total power failure, the analysis is fully operational as soon as power is returned to the unit.

PHOTO DETECTOR

The primary detection sensor is silicon based photovoltaic device that does not have the performance decay associated with photo resistive detection devices.

STATUS REPORT LOG

At any point in time the operator can select to view current operation status on the analyzer status page.

LED LIGHT SOURCE

The analysis illumination light source is a high efficiency LED which does not have the stability and aging problems associated with incandescent light sources.

TEMPERATURE COMPENSATION

Information processing algorithms completely eliminate the effect of parameter offsets commonly referred to as drift.  Any effect of temperature on the system amplifier gain is compensated by the use of internal reference measurements made at the beginning of teach tape advance cycle.  These reference measurements are used to normalize signal processing.

SWEPT VOLUME HUMIDIFIER

The humidification contact chamber is 1/8” tube path that is continuously swept as the sample flows.  This eliminates any dead volume, which would affect reading accuracy and system response.