airpointer®QM & QS
Calibration Procedures and Quality Assurance
The airpointer® is developed by pracitcal experienced experts. Special care was taken to ensure the highest level of data quality.
Calibration check
An internal zero air supply for the automatic or manual zero check is standard in the airpointers® ambient gas modules (CO, NOX/NO/NO2, SO2/H2S, O3) can be optionally equipped with span check system integrated on their drawer.
The CO analyzing module is checked by small user refillable calibration bottle mounted at the module angle.
An internal permeation system is used with Nitric Oxide and the Sulfur Dioxide/Hydrogen Sulfide analyzing module. This system applies permeation tubes which contain pure gas under high pressure. At a constant temperature a specific amount of gas is flowing across a membrane at the permeation tube, which is mixed with a constant flow of zero air.
This enables a precise and reliable span gas supply.
The Ozone analyzing module is checked by an ozone generator. In this generator a constant flow of zero air is mixed with Ozone produced by an UV-lamp.
All function checks are stored in the internal database of the airpointer®. At any time the user has access to this data.
Calibration
For a calibration with external span gas the maintenance door can be used. There is no need to open the airpointers® main door. This ensures a constant internal temperature during calibration.
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| Graphical calibration screen for easy control of the calibration procedure | A broad range of internal parameters is monitored for systems diagnostics |
The calibration is performed via a graphical Interface in the user menu. The parameters to be calibrated are displayed in a concentration vs. time diagram. This allows the user to assess the stability of the measurement and shows if constant conditions are reached.
After the calibration the airpointer® indicates if the calibration was successful. In this case it presents the new calibration function which is stored in the internal database. At any time the user has access to this data.
Maintenance/Diagnostics
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Maintenance door on the |
For the routine maintenance the maintenance door can be utilized. The is no need to open the airpointers® main door. This ensures a constant internal temperature during maintenance and diagnostic procedures. Behind the maintenance door connection facilities for a Notebook (RJ485) incl. power supply, for the external zero or span gas and the sample filter holder are arranged. The filter holder has a glass window to enable the user to check the proper seat and the need for filter replacement.
All analyzing modules are equipped with their own flow sensors to ease trouble shooting. A leak check of the complete system or single analyzing modules is easy to perform.
Software
All relevant operation parameters of the airpointer® are monitored and stored every minute in the systems data base. This allows preventive maintenance as well as understanding the influence of potential errors to the data.
Extensive diagnostic features are an integrated part of the systems software. A seperate program (watchdog) observes the operation and corrects potential dysfunctions automatically.
The change of measuring site, the calibrations, malfunctions and their repair can be documented in electronic format in the airpointers® station logbook.
All errors are automatically stored in user accessible protocol files. The data safety can be enhanced via an automatic independent backup at the recordum® portal which is operated by recordum® and located in a secure data center in Europe.