Eaton K1650 Instruction Manual

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Eaton K1650 Instruction Manual Manual pdf 21 page image

INM MTL 130-0126 Rev 13175.3 Calibration gasesThree are required.• 100% Hydrogen• 100% Carbon Dioxide• Dry AirThe diagram that follows illustrates the calibration process.5.3.1 Analysers working at alternator casing pressureWhen this is the case the analyser must be calibrated at the appropriate pressure(s) for bestaccuracy.A typical filling regime for an alternator is described below.• From the alternator casing filled with air at atmospheric pressure, CO2 is introduced topurge out the air. At the end of this operation, when CO 2 level is high (approaching100%), the system is pressurised to some pressure - we will refer to it as ‘x’ barg.• H2 is then introduced at x barg to purge out the CO2 . When the H2 level is high(approaching 100%), system is pressurised to a higher pressure – we will refer to itas ‘y’ barg.The following assumptions are made in advising this alternative calibration process.• The 0 to 100% CO2 in air range is only used as an approximate indicator until theCO2 level gets near to 100%. Only at high CO2 level is the reading required to bereasonably accurate.• The 0 to 100% H2 in CO2 range is again only used as an approximate indicator until thehydrogen level gets near to 100%.• The 90 to 100% H2 in air is the most important range and requires bestaccuracy throughout.To accommodate this situation the following techniques and processes are used.The instrument’s three calibration points must be performed at the pressures indicated below.• 100% Air calibration – at atmospheric pressure• 100% Hydrogen calibration – at y barg• 100% Carbon dioxide – at x bargThis approach will produce the ‘best fit’.

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