/ 159 BENEFITS AT A GLANCE • High level of precision (< 0.4 % of the selected step) • Pressure-independent flow stability • “Plug & play” integration • Simple use and operation • Extraordinary long-term stability • Remote diagnosis down to valve and sensor level • Factory-calibrated and individually certified, NIST traceable • Backward compatible with AVL systems of former generations • Integrated or external versions of the different devices available EMISSION CALIBRATION DEVICES AVL iCAL The accuracy of exhaust measurement systems is highly dependent on the quality and precision of the calibration devices used. Accordingly, AVL has spared no expense to develop the most accurate devices on the market. In order to allow for the highest quality standard and to minimize operating errors, our calibration devices are also available in fully automated design. This substantially reduces the time required by the operator. MEASUREMENT PRINCIPLE UND APPLICATION The AVL gas divider iCAL GDU is a highly precise device for the calibration of gas analyzers. The underlying physical principle is based on the combination of calibrated, critical nozzles allowing for dilution of the test gases in an accurate manner. The pressures of the calibration and dilution gases are controlled by means of a highly precise pressure controller with extraordinary long-term stability. The AVL NOX converter tester iCAL NGU is used to check the efficiency of the NOX converter of CLD analyzers. The technology is based on the gas phase titration between NO and O3 and provides known concentrations of nitrogen dioxide (NO2). The ozone (O3) is generated by means of corona discharge in an atmosphere consisting of pure oxygen (O2). The iCAL CFO (critical flow orifice) propane injection tester is used to inject a precise quantity (e.g. of propane) into the CVS dilution system or into a SHED chamber. The injected quantity is compared to the mass measurement of the CVS dilution system or the SHED chamber. For improved accuracy, the iCAL CFO is temperature- stabilized to 50° C. Most regulations require the regular implementation of this CFO test. The iCal calibration devices allow manual or fully automatic verifications of analyzers (linearity, NOX converter check) and system leak checks (CFO test). These devices can be connected to the exhaust measurement system by plug & play and are visualized in the iGEM software.
Solutionskatalog2014_E
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