Eaton K1650 Instruction Manual

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Eaton K1650 Instruction Manual Manual pdf 20 page image

16INM MTL 130-0126 Rev 135 CALIBRATION5.1 GeneralThe MTL katharometer based analysers are extremely stable instruments and require onlyvery occasional calibration. The exact calibration period depends on the type of sample andenvironment the instrument is placed in. In practice it is unlikely that check periods of lessthan one month would be necessary and three to six months would normally be in order. Werecommend that any quality assurance procedures written for the instrument are written toallow verification as opposed to calibration. Verification involves checking that the instrumentprovides the correct analysis of a standard gas within the limits of the instrument and onlycalibrating when a result outside of limits is produced. The frequency of the verification wouldneed to be in line with the quality regime being operated by the user.WARNINGThe analogue output is set to 2mA (K1650) or 0v (K6050) while the instrumentis being calibrated. Ensure that any control loops that are connected to theinstrument are disabled prior to verifying or calibrating the instrument. Alsoensure that the process is in a safe state and the exhaust of the standard gasis vented to a safe area. Calibration mode can only be entered by pressing theCalibrate button for approximately 8 seconds whilst in Measurement Mode.5.2 PipingEnsure that the piping and connectors are of good quality with no possibility of leaks. Metalpiping is preferred as it is less prone to damage and sealing problems. Pressure regulators andgauges that may be in the calibration gas lines all have a certain amount of dead space withinthem and so may require purging for several minutes before the delivered gas matches that ofthe cylinder contents. The regulator etc. may be connected to the instrument and the purgemonitored by using the instrument in measurement mode. Only when the reading is steadyhas the dead space been purged.NOTEFor permanent installations (K1650) in may be convenient to include a ‘T’ piece andappropriate valves in the sample inlet line so that the calibration gas is easily connected.Figure 11 - Sample and calibration gas pipingCalibrationGas InletTo ProcessSample ConnectionTo Sample InletFilterShut-offValvePump-if requiredShut-offValve