vacuubrand PC 511 NT Instructions For Use Manual

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vacuubrand PC 511 NT Instructions For Use Manual Manual pdf 35 page image

page 35 of 63Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefullythe validity of this document with respect to his product. Manual-no.: 999188 / 19/05/2009The vacuum gauge was adjusted using factory standards, which are traceablethrough regular calibration in an accredited laboratory (German Calibration service)to the German national pressure standard. Depending on the process and/or ac-curacy requirements, check the adjustment and readjust if necessary. For readjust-ment, the device has to be adjusted both at atmospheric pressure as well as undervacuum but only if the reference pressures are certainly known. The adjustmentmode can be activated only if the process control is inactive. Press key ”START/STOP” if necessary. In the range between 20 and 700 mbar no adjustment is pos-sible; ---- mbar is displayed.Adjustment at atmospheric pressureAn adjustment at atmospheric pressure is only possible if thepressure is higher than 700 mbar.Ventilate the measurement connection of the CVC 3000 and/or the vacuum system. Make sure that the pressure trans-ducer is at atmospheric pressure.➨ In function ”Configuration” select program ”Adjustment” atthe controller.➨ Use the selection knob to adjust the reading to the currentatmospheric pressure.➨ Press the selection knob to confirm.Adjustment under vacuumAn adjustment under vacuum is only possible if the pressureis lower than 20 mbar absolute.Evacuate the measurement connection of the CVC 3000 toa pressure < 0.1 mbar (e. g. by applying a good two-stagerotary vane pump).➨ In function ”Configuration” select program ”Adjustment” atthe controller.☞ The reading is automatically adjusted to ”zero”.➨ Press the selection knob to confirm.Adjustment at a reference pressureInstead of adjustment under vacuum to a pressure < 0.1 mbar,adjustment to a precisely known reference pressure within therange of 0 ..... 20 mbar is possible. Evacuate the measure-ment connection of the CVC 3000 to a pressure within 0 .....20 mbar➨ In function ”Configuration” select program ”Adjustment” atthe controller.☞ The reading is automatically adjusted to ”zero”.➨ Use the selection knob to adjust the display to the refer-ence pressure at the vacuum line within the range of 0 ..... 20mbar.➨ Press the selection knob to confirm.1013 mbar0 mbar0...20 mbarReadjustment of CVC 3000NOTICENote: To determine the actual atmospheric pressure, use an accurate barometer or get accurate read-ing from the weather service, the next airport.......(take into account the difference in altitude between e.g. airport and laboratory).Note: Adjustment under vacuum with an actual pressure higher than 0.1 mbar reduces the accuracy ofthe measurement. If the pressure is significantly higher than 0.1 mbar, adjustment to a reference pres-sure is recommended.Note: The accuracy of the value of the reference pressure will directly affect the accuracy of the adjust-ment. If the nominal ultimate vacuum of a diaphragm pump is used as reference vacuum, the accuracyof the controller might be doubtful. The diaphragm pump may not achieve the specified value (due tocondensate, poor condition, failure of valves or diaphragm, leaks).