vacuubrand PC 500 LAN Instructions For Use Manual

vacuubrand PC 500 LAN Instructions For Use Manual Manual pdf 25 page image

Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to checkcarefully the validity of this document with respect to his product. Manual-no.: 999084 / 05/10/2009page 25 of 46The vacuum gauge was adjusted using factory standards, which are traceable throughregular calibration in an accredited laboratory (German Calibration service) to the na-tional standard. Depending on the process and/or accuracy requirements, check theadjustment from time to time and readjust if necessary. For readjustment, the devicehas to be adjusted both at atmospheric pressure as well as under vacuum.ReadjustmentAdjustment at atmospheric pressureVentilate the controller and/or the vacuum system. Make surethat the vacuum connection at the controller is at atmosphericpressure.➨ Select program ”Cal.Sens” at controller.➨ Use keys ▲ and ▼ to adjust the display to the actual localatmospheric pressure.➨ Confirm value with key ”Enter”.Note: To determine the actual atmospheric pressure, use an accurate barometer or get accurate readingfrom the weather service, the next airport.......(take into account the difference in altitude between e. g.airport and laboratory).Adjustment under vacuumEvacuate the controller via the vacuum connection to a pres-sure < 0.5 mbar (e. g. by applying a good rotary vane pump).➨ Select program ”Cal.Sens” at controller.☞ The display is set to zero automatically.➨ Confirm value with key ”Enter”.Note: Adjustment under vacuum with an actual pressure higher than 0.5 mbar reduces the accuracy of themeasurement. If the pressure is significantly higher than 0.5 mbar, adjustment to a reference pressure isrecommended.Adjustment at a reference pressureInstead of adjustment under vacuum to a pressure < 0.5 mbar,adjustment to a reference pressure within the range of 0 ..... 20mbar is possible.Evacuate the controller via the vacuum connection to a refer-ence pressure within the range 0 .... 20 mbar.➨ Select program ”Cal.Sens” at controller.☞ The display is set to zero automatically.➨ Use keys ▲ and ▼ to adjust the display to the actual refer-ence pressure at the vacuum connection within the range of0 .... 20 mbar.➨ Confirm value with key ”Enter”.Note: The accuracy of the value of the reference pressure will directly affect the accuracy of the adjustment.If the nominal ultimate vacuum of a diaphragm pump is used as reference vacuum, the accuracy of thecontroller might be doubtful. The diaphragm pump may not achieve the specified value (due to condensate,poor state, failure of valves or the diaphragm).1013mbar0mbar0....20mbar