GCAS® OPERATION
FOOTPRINT
Footprint
• Access from View – Footprint menu
Footprint – RF Trend
• Shows the trend of RF in the correct order of RF from low to high• Trend should be ascending
Footprint – Correlation Chart
• Shows correlation between RF and molecular weight of saturated component
• For Daniel GC, correlation on the first two chart is expected to be higher than 0.995
• The third chart will help troubleshoot in case of low correlation in the first two charts
Footprint – Retention Time
• Shows the chart of retention time of each component
CALIBRATION DATA
Calibration Data
• Access from View – Calibration Data menu
Calibration Data Features
• Features is exactly the same as footprint• It shows calibration data in comparison to its footprint
FOOTPRINT / CALIBRATION DATA ACTION MENU
Action Menu
• When footprint or calibration data page is open, Action menu will be shown.
Action Menu – Import Data
• Import data is to import GC generated final calibration report• On Daniel GC it will be a text file of Final Calibration Report• It is not necessary to do this if the GC is connected via Modbus
Action Menu – Import Data CSV
• GCAS has csv format it recognize• Historical data can be imported to GCAS using CSV file• Both Calibration (RF and RT) and Mole% data can be imported
Action Menu – Manual Entry
• Manual Entry is possible• This is for data that is not available in electronic format to be entered
manually• Caution needs to be taken as there is no edit feature on footprint /
calibration data page
Action Menu – Set Status
• Status to each data can be set as following:– Active / Inactive
• Inactive data will not be included in the trend• Inactive data will not be included in uncertainty calculation
– Set flag• Footprint data will be used as reference of calibration data comparison
Action – Add Comment
• Each calibration data can be added a comment associated with it• It can be error found or any finding regarding to the particular
calibration data• This can be used as audit trail
MOLE COMPOSITION
Mole Composition
• Access from View – Mole Composition menu
Mole Composition
• Data is stored as normalized percentage• Un-normalized percentage can be shown as a reference
MOLE COMPOSITION ACTION MENU
Action Menu
• When mole composition page is open, Action menu will be shown
Action Menu – Spot Sampling
• It allows spot sampling data to be entered as mole composition• Spot sampling will be shown as a dot in mole composition trending• It will be compared against GC measured mole composition in the
same trend
Action Menu – Import Data CSV
• Historical data can be imported using a CSV file
Action Menu – Set Status
• Mole Composition status can be set as active / inactive
Action Menu – Set Status (Bulk)
• Many data from a period of time can be set as a bulk• It is useful for instance in situation where there is platform shut
down and therefore the data for the period is meaningless
Action Menu – ISO 6976 Calculation
• It shows the ISO 6976 calculation for the particular mole composition• Once in the page, other data can be selected from the same GC
Action Menu – Add Comment
• Comment can be added to each mole composition
CALIBRATION GAS CERTIFICATE
Calibration Gas Certificate
• Access from View – Calibration Certificate menu
Calibration Gas Certificate
• Shows the information of the calibration gas being used
• Historical data is also stored• Provide information of uncertainty of
each gas• Information tab provide information of
the bottle
CALIBRATION GAS CERTIFICATE ACTION MENU
Action Menu
• When calibration gas certificate page is open, Action menu will be shown
Action Menu – New Certificate
• New certificate menu is to enter the calibration gas certificate data
• Both mole% and uncertainty to be entered
• Uncertainty value will be used to calculate overall GC uncertainty that can be accessed from another form
• Bottle information to be entered as audit trail
Action Menu – Edit Certificate
• This feature is useful to correct any mistake on entered data
• Edit certificate feature has been added as it has been many cases where data was entered wrongly
Action Menu – Set Status or K-Number
• Set status is to make the calibration certificate status active / inactive• Inactive status will not be included in uncertainty calculation as well
as multi level calibration / Single Point Calibration conversion• Set k-number is to set the confidence level of uncertainty, k = 1
(68%); k = 2 (95%)
Action Menu – ISO 6976 Calculator
• Provides ISO 6976 calculation for calibration gas composition
Action Menu – Add Comment
• Provide comment for the particular calibration gas for audit trail
DATA ANALYSIS
Data Analysis
• Access from View – Data Analysis menu
Data Analysis
• The following is data Analysis Form
Data Analysis – Select Parameter (RF)
• When selected parameter is RF, select component will determine which component will be trended. Single or multiple component can be trended in the same chart.
Data Analysis – Select Chart Type
• Chart type can be selected as RF/RT trend or RF/RT deviation trend (similar logic for RF and RT parameter)
• RF/RT trend will show actual data
• Deviation trend will show difference to footprint
• Multiple data can be shown in the same trend
Data Analysis – Select Parameter (mc)
• MC is short for Mole Composition• Shows the mole composition from
GC• Display spot sample button will
show spot sample result in the trend
• Select stream will show the trend of GC associated stream
Data Analysis – Select Parameter (mc)
• MC is short for Mole Composition• Shows the mole composition from
GC• Display spot sample button will
show spot sample result in the trend
• Select stream will show the trend of GC associated stream
Data Analysis – Select Parameter (R2)
• This shows the trend of correlation parameters• One or more parameters can be shown in the same trend at the
same time
Data Analysis - Option
• Plot range: To select time range for data to be plotted
• Display mean and ± 2 x standard deviation: to show the mean and 2σ in the trend
• Various options on what data is used to calculated the mean and 2σ
REPEATABILITY TEST – UNDER CONSTRUCTION
UNCERTAINTY CALCULATION
Uncertainty calculation
• Access from View – Uncertainty Calculation menu
Uncertainties to Include
• Select what uncertainty to include in overall uncertainty calculation
• Calibration gas needs to exist for this form to work
• MLC constant to exist for option of repeatability and linearity to work
• Calibration data history to exist for reproducibility to work
Uncertainty from the calibration gas
• Select which calibration gas to be used for calculation
• Cal gas data also used for GC reproducibility and ISO 6976 uncertainty calculation
Uncertainty from GC repeatability and linearty
• Enter or choose existing repeatability coefficient set
• Enter or choose existing linearity coefficient set
• Enter mole% range
Uncertainty from GC reproducibility
• Select which range of calibration data to be included in uncertainty calculation
ISO 6976 INPUTS
• Select options for ISO 6976 calculation to determine the sensitivity calculation of each component
Calculations
• Shows the step by step calculation results of the uncertainty calculation
Outputs - Summary
• Shows the summary of uncertainty calculation
Outputs – Uncertainty of xx
• Shows the detailed result of uncertainty of ISO 6976 calculation
UNCERTAINTY COEFFICIENTS
Uncertainty Coefficients
• Shows the in-use multilevel calibration coefficients being used for repeatability and linearity uncertainty calculation
Uncertainty Coefficients – Action Menu
• From action menu the following can be done:– Edit current coefficient– Add new coefficient set– Set status (active / inactive)
UNCERTAINTY TREND
Input option
• Parameters to be used for trending needs to be identified prior to trending
Input Option
• Define which uncertainty to include• Select which calibration gas certificate to be used• Select which footprint to be used as reference for uncertainty calculation• Select coefficient set for repeatability/linearity uncertainty• Select ISO 6976 option• Select direction of calculation– Forward (from footprint onward)– Backward (last n number of data)
• Select data range• Set threshold value
Trend Page
• Trend of all ISO 6976 output uncertainty can be selected• Trend will be done based on the input option selected
MULTILEVEL CALIBRATION COEFFICIENTS – UNDER CONSTRUCTION
COMMENTS
Comments
• Shows all comments related to selected device• Each comment can be clicked to bring the related page up
DASHBOARD
Dashboard
• Dashboard shows the current condition of all GC in the system• Green means all is healthy• Red means that GC needs attention
DASHBOARD SETTINGS
Dashboard Settings
• What to be displayed and what will trigger alarm can be set in dashboard setting
Health status to display
• Maximum of 4 statuses can be displayed which is selectable
Rules
• Alarm rules can be set from rules tab
Uncertainty calc setting
• As uncertainty calculation is dependent on data selection, which data to be displayed on dashboard can be set
Display Style
• Select how the data to be displayed on dashboard
Miscellaneous
• Shows some of miscellaneous selection as shown on picture below
